Asme Pwht Preheat

8/10/2019 Asme Pwht Preheat

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P

No.

Group

No.

1 1

1 2

1 3

3 1

3 2

3 3



4 1

4 2

5A 1

5B 1



15E 1

6 1

6 2



6 3

7 1

7 2

8 1

8 2



8 3

8 4

10I 1

31

45

51

1 4



5C 1

6 4

9A 1



9B 1

10A 1

10B 1



10C 1

10F 1

10H 1

10K 1

11A 1



11A 2

11A 3

11A 4



11A 5

11B 1

11B 2



11B 3

11B 4

11B 6





5C 5

5C 4

5C 3

26

9C 1

11B 9

21



22

23

25

32

33

34

35

41

42

43



44

46

49

52

53

61



PWHT ect on - v s on : equ rements or o a e -

For Mandatory and Non-Mandatory conditions of PWHT, See Note (2) of Table UCS-56

When PWHT is Mandatory for P-No. 1 Group No. 1 by Table UCS-56:

Min. Holding Temperature: 1,100 °F (595 °C)

Min. Holding Time at Normal Temperature for Nominal Thickness:

Up to 2 in. (50 mm): 1 hr/in., 15 min Min.

Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch over 2 in. (50 mm)

For PWHT at lower temperatures for longer periods of time, See Note (1) of Table UCS-56 ect on - v s on : equ rements or o a e -






Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch over 2 in. (50 mm)For PWHT at lower temperatures for longer periods of time, See Note (1) of Table UCS-56

ect on - v s on : equ rements or o a e -







For PWHT at lower temperatures for longer periods of time, See Note (1) of Table UCS-56 ect on - v s on : equ rements or o a e -

For Mandatory and Non-Mandatory conditions of PWHT, See Notes (3) (4) of Table UCS-56


Min. Holding Temperature: 1,100 °F (595 °C)Min. Holding Time at Normal Temperature for Nominal Thickness:



For PWHT at lower temperatures for longer periods of time, See Note (1) of Table UCS-56ect on - v s on : equ rements or o a e -







For PWHT at lower temperatures for longer periods of time, See Note (1) of Table UCS-56ect on - v s on : equ rements or o a e -

PWHT is Mandatory for P-No. 3 Group No. 3 material in all thicknesses by Table UCS-56:





For PWHT at lower temperatures for longer periods of time, See Note (1) of Table UCS-56

Heating [Cooling] Rate as for UCS-56: Above 800 °F (425 °C), Maximum rate of heating is 400 °F/hr (222 °C/hr)

ASME Section VIII-Division 1, Pres









Over 2 in. (50 mm) to 5 in. (125 mm): 1 hr/in. (25 mm)Over 5 in. (125 mm): 5 hr plus 15 min for each additional inch over 5 in. (125 mm)







Over 2 in. (50 mm) to 5 in. (125 mm): 1 hr/in. (25 mm)


ASME Section VIII-Division 1: Requirements for PWHT of Table UCS-56

For Exemptions (Non-Mandatory conditions) of PWHT, See Note (2) of Table UCS-56

When PWHT is Mandatory for P-No. 5A Group No. 1 by Table UCS-56:








[cooling 500 °F/hr (280 °C/hr)] divided by the maximum metal thickness of the shell or head plate in inches, but in

no case should it be more than 400 °F/hr (222 °C/hr) [cooling 500 °F/hr (280 °C/hr)]; Minimum heating and

cooling rates 100 °F/hr (56 °C/hr); Above 800 °F (425 °C) cooling shall be done in a closed furnace or cooling

chamber; From 800 °F (425 °C) the vessel may be cooled in still air; Note that the temperature of the furnace

shall not exceed 800 °F (425 °C) at the time the vessel or part is placed in it.



When PWHT is Mandatory for P-No. 5B Group No. 1 by Table UCS-56:








[cooling 500 °F/hr (280 °C/hr)] divided by the maximum metal thickness of the shell or head plate in inches, but inno case should it be more than 400 °F/hr (222 °C/hr) [cooling 500 °F/hr (280 °C/hr)]; Minimum heating and








ASME Section VIII-Division 1: Requirements for PWHT of Table UHA-32

PWHT for P No. 6 Group No. 3 material, except Note (1) of Table UHA-32:




Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch (25 mm) over 2 in. (50 mm)For Exemption (Non-Mandatory conditions) of PWHT for some Type 410 materials, See Note (1) of Table UHA-

32








PWHT for P No. 7 Group No. 1 material, except Notes (1) (3) of Table UHA-32:


Up to 2 in. (50 mm): 1 hr/in. (25 mm), 15 min Min.

Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch (25 mm) over 2 in. (50 mm)

For Exemption (Non-Mandatory conditions) of PWHT of some materials, See Notes (1) (3) of Table UHA-32

Cooling Rate as for Table UHA-32: Max. 100 °F/hr (55 °C/hr) in the range above 1200 °F (650 °C) after which

the cooling rate shall be sufficiently rapid to prevent embrittlement.

Heating Rate as for UCS-56: Above 800 °F (425 °C), Maximum rate of heating is 400 °F/hr (222 °C/hr) divided by

the maximum metal thickness of the shell or head plate in inches, but in no case should it be more than 400 °F/hr

(222 °C/hr); Minimum heating rate 100 °F/hr (56 °C/hr); Note that the temperature of the furnace shall not exceed

800 °F (425 °C) at the time the vessel or part is placed in it.


PWHT for P No. 7 Group No. 2 material, except Notes (1) (3) of Table UHA-32:Min. Holding Temperature: 1,350 °F (730 °C)




For Exemption (Non-Mandatory conditions) of PWHT of some materials, See Notes (1) (3) of Table UHA-32








PWHT is neither required nor prohibited for joints between austenitic stainless steels of the P-No. 8 Group No.1










For P-No. 10I Group No. 1 materials, for a thickness of 1 ⁄ 2 in. (13 mm) or less

PWHT is neither required nor prohibited. PWHT for thickness above 1 ⁄ 2 in. (13 mm):




Over 2 in. (50 mm): 1 hr/in. (25 mm)For PWHT conditions, See Notes (1) (3) of Table UHA-32

PWHT temperatures for alloy S44635 is shown in Table UHA-32, when heat treatment decided, See Note (3)







ASME Section VIII-Division 1: Requirements for PWHT of Nonferrous Materials

UNF-56: For Nonferrous Materials, PWHT is not normally necessary nor desirable, except in UNF-56 (c) (d) (e)

for heat treatment data for some alloys. PWHT only should be conducted by agreement between user and

manufacturer.




manufacturer.




manufacturer. ect on - v s on : equ rements or o a es - an -

PWHT is not applicable for P-No. 1, Group 4 materials.PWHT for SA-724 Grade C [based on Table UHT-56, for thickness over 1.5 in. (38 mm)]:

Nominal Thickness requiring PWHT: Over 1.5 in. (38 mm)

PWHT Temperature: 1050–1150 °F (565–620 °C)

Holding Time: 1 hr/in., 1/2 hr Min.

Heating and Cooling Rate as for UCS-56 and UHT-56: Above 800 °F (425 °C), Maximum rate of heating is 400

°F/hr (222 °C/hr) divided by the maximum metal thickness of the shell or head plate in inches, but in no case





When PWHT is Mandatory for P-No. 5C Group No. 1 by Table UCS-56:



Up to 2 in. (50 mm): 1 hr/in., 15 min Min.Over 2 in. (50 mm) to 5 in. (125 mm): 1 hr/in. (25 mm)









ASME Section VIII-Division 1: Requirements for PWHT of Table UHT-56

There are no PWHT data in Table UHT-56 for P-No. 6 Group No.4, exceptfor the following material:

PWHT for SA-487 Grade Class CA 6NM for thickness over 0.58 in. (15 mm):

Nominal Thickness requiring PWHT: Over 0.58 in. (15 mm)


Holding Time: 1 hr/in. (25 mm), 1/4 hr Min.



should it be more than 400 °F/hr (222 °C/hr); Minimum heating and cooling rates 100 °F/hr (56 °C/hr); Where

accelerated cooling from the tempering temperature is required by the material specification, the same minimum

cooling rate shall apply to PWHT; Above 800 °F (425 °C) cooling shall be done in a closed furnace or cooling




For Exemptions (Non-Mandatory conditions) of PWHT, See Notes (2) (3) of Table UCS-56

When PWHT is Mandatory for P-No. 9A Group No. 1 by Table UCS-56:



1 hr Min., plus 15 min/in. (25 mm) for thickness over 1 in. (25 mm), See Note (4)

of Table UCS-56, when additional 15 min/in. (25 mm) holding time is not required.





cooling rates 100 °F/hr (56 °C/hr); Above 800 °F (425 °C) cooling shall be done in a closed furnace or coolingchamber; From 800 °F (425 °C) the vessel may be cooled in still air; Note that the temperature of the furnace






When PWHT is Mandatory for P-No. 9B Group No. 1 by Table UCS-56:


Max. Holding Temperature: 1,175 °F (635 °C)

Min. Holding Time at Normal Temperature for Nominal Thickness:1 hr Min., plus 15 min/in. (25 mm) for thickness over 1 in. (25 mm), See Note (5)










For Exemptions (Non-Mandatory conditions) of PWHT, See Notes (2) (3) of Table UCS-56When PWHT is Mandatory for P-No. 10A Group No. 1 by Table UCS-56:













PWHT is Mandatory for P-No. 10B Group No. 1 by Table UCS-56:















When PWHT is Mandatory for P-No. 10C Group No. 1 by Table UCS-56:



1 hr Min., plus 15 min/in. (25 mm) for thickness over 1 in. (25 mm), See Note (4)of Table UCS-56, when additional 15 min/in. (25 mm) holding time is not required.









PWHT is Mandatory for P-No. 10F Group No. 1 by Table UCS-56:










ASME Section VIII-Division 1: Requirements for PWHT of Table UHA-32PWHT is neither required nor prohibited for joints between materials of the P-No. 10H Group No. 1

PWHT temperatures for certain alloys are shown in Table UHA-32, when heat treatment decided, See Note (1)


PWHT is neither required nor prohibited for joints between materials of the P-No. 10K Group No. 1

PWHT temperatures for alloy S44660 is shown in Table UHA-32, when heat treatment decided, See Note (1)


For P-No. 11A Group No. 1 materials shown in Table UHT-56:

Thickness requiring PWHT: Over 2 in. (50 mm)

PWHT Temperature: 1025–1085 °F (550–585 °C)Holding Time: 1 hr/in. (25 mm), 2 hr Min.













PWHT is neither required nor prohibited for P-No. 11A Group No. 5

When performing PWHT:


Holding Time: 1 hr/in. (25 mm), 1 hr Min.

Note: Consideration should be given to the possibility of temper embrittlement. The cooling rate from PWHT,when used, shall not be slower than that obtained by cooling in still air.

***See UHT-82(e) for extra requirements of essential variables, in addition to variables in ASME Section IX, for

SA-508 and SA-543 materials.








ASME Section VIII-Division 1: Requirements for PWHT of Table UHT-56For P-No. 11B Group No. 1 materials shown in Table UHT-56:

Thickness requiring PWHT: Over 0.58 in. (15 mm)










***See UHT-82(f) for extra requirements of essential variables, in addition to variables in ASME Section IX, for SA-

517 and SA-592 materials.


For P-No. 11B Group No. 2 materials shown in Table UHT-56:









chamber; From 800 °F (425 °C) the vessel may be cooled in still air; Note that the temperature of the furnaceshall not exceed 800 °F (425 °C) at the time the vessel or part is placed in it.










Heating and Cooling Rate as for UCS-56 and UHT-56: Above 800 °F (425 °C), Maximum rate of heating is 400°F/hr (222 °C/hr) divided by the maximum metal thickness of the shell or head plate in inches, but in no case










Thickness requiring PWHT: Over 0.58 in. (15 mm)PWHT Temperature: 1000–1100 °F (540–595 °C)











ASME Section VIII-Division 1: Requirements for PWHT of Table UHT-56For P-No. 11B Group No. 6 materials shown in Table UHT-56:











***See UHT-82(f) for extra requirements of essential variables, in addition to variables in ASME Section IX, for SA-517 and SA-592 materials.








Heating and Cooling Rate as for UCS-56 and UHT-56: Above 800 °F (425 °C), Maximum rate of heating is 400°F/hr (222 °C/hr) divided by the maximum metal thickness of the shell or head plate in inches, but in no case









PWHT is neither required nor prohibited for P-No. 11B Group No. 10

When performing PWHT:PWHT Temperature: 1000–1050 °F (540–565 °C)

Holding Time: 1 hr/in. (25 mm), 1 hr Min.

Note: Consideration should be given to the possibility of temper embrittlement. The cooling rate from PWHT,

when used, shall not be slower than that obtained by cooling in still air.

***See UHT-82(e) for extra requirements of essential variables, in addition to variables in ASME Section IX, for

SA-508 and SA-543 materials.








ASME Section VIII-Division 1: Requirements for PWHT Tables UCS-56, UHA-32, UHT-56

There is no data for this material [P-No. 10 (Cr-Cu steel)] on these Tables.

PWHT requirements shall be based on Welding Procedure Specification (WPS).

ASME Section VIII-Division 1: Requirements for PWHT of Nonferrous MaterialsUNF-56: For Nonferrous Materials, PWHT is not normally necessary nor desirable, except in UNF-56 (c) (d) (e)


manufacturer.


There is no data for this material (P-No. 10J Group No. 1) on these Tables.





There is no data for this material (P-No. 5C Group No. 5) on these Tables.



There is no data for this material (P-No. 5C Group No. 4) on these Tables.PWHT requirements shall be based on Welding Procedure Specification (WPS).






manufacturer.





There is no data for this material (P-No. 11B Group No. 9) on these Tables.PWHT requirements shall be based on Welding Procedure Specification (WPS).




manufacturer.






manufacturer.



manufacturer.




manufacturer.



for heat treatment data for some alloys. PWHT only should be conducted by agreement between user andmanufacturer.




manufacturer.




manufacturer.



manufacturer.




manufacturer.







manufacturer.






manufacturer.



manufacturer.




manufacturer.







manufacturer.




manufacturer.



Preheat

ASME Section VIII-Division 1: Non-Mandatory Appendix R Preheating

(a) 175 °F (79 °C) for material which has both a specified maximum carbon content

in excess of 0.30% and a thickness at the joint in excess of 1 in. (25 mm):

(b) 50 °F (10 °C) for all other materials of P-No. 1 Group No. 1



in excess of 0.30% and a thickness at the joint in excess of 1 in. (25 mm):(b) 50 °F (10 °C) for all other materials of P-No. 1 Group No. 2






(a) 175 °F (79 °C) for material which has either a specified minimum tensile strength in

excess of 70,000 psi (480 MPa) or a thickness at the joint in excess of 5/8 in. (16 mm):










sure Vessels





excess of 60,000 psi (410 MPa) or a thickness at the joint in excess of 1/2 in. (13 mm):(b) 50 °F (10 °C) for all other materials of P-No. 4 Group No. 1







excess of 60,000 psi (410 MPa) or has both a specified minimum chromium content

above 6.0% and a thickness at the joint in excess of 1/2 in. (13 mm):

(b) 300 °F (149 °C) for all other materials of P-No. 5A Group No. 1

ASME Section VIII-Division 1: Non-Mandatory Appendix R Preheating(a) 400 °F (204 °C) for material which has either a specified minimum tensile strength in



(b) 300 °F (149 °C) for all other materials of P-No. 5B Group No. 1






400 °F (204 °C) for materials of P-No. 6 Group No. 3


Preheating is not required for materials of P-No. 7 Group No. 1










There is no data for this material on Appendix R

Preheat requirements shall be based on Welding Procedure Specification (WPS).





300 °F (149 °C) with interpass temperature maintained between 350 °F and 450 °F

(177 °C and 232 °C) for materials of P-No. 10I Group No. 1






















250 °F (121 °C) for materials of P-No. 9A Group No. 1




300 °F (149 °C) for materials of P-No. 9B Group No. 1











(a) 400 °F (204 °C) for material which has either a specified minimum tensile strength inexcess of 60,000 psi (410 MPa) or has both a specified minimum chromium content



Consideration shall be given to the limitation of interpass temperature for various

thicknesses to avoid detrimental effects on the mechanical properties of heat treated

materials.

ASME Section VIII-Division 1: Non-Mandatory Appendix R Preheating(a) 400 °F (204 °C) for material which has either a specified minimum tensile strength in






materials.














materials.




(b) 50 °F (10 °C) for all other materials of P-No. 11B Group No. 2Consideration shall be given to the limitation of interpass temperature for various


materials.









materials.







materials.







thicknesses to avoid detrimental effects on the mechanical properties of heat treatedmaterials.
























There is no data for this material on Appendix RPreheat requirements shall be based on Welding Procedure Specification (WPS).






































PWHT ect on : an atory equ rements or o a e - -

For Exemptions (Non-Mandatory conditions) of PWHT, See Note (a) of Table PW-39-1

When PWHT is Mandatory for P-No. 1 Group No. 1 by Table PW-39-1:


Min. Holding Time at Normal Temperature for Weld Thickness (Nominal):

Up to 2 in. (50 mm): 1 hr/in. (1hr/25 mm), 15 min Min.


For PWHT at lower temperatures for longer periods of time, See Note (b) of Table PW-39-1ect on : an atory equ rements or o a e - -






Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch (25 mm) over 2 in. (50 mm)For PWHT at lower temperatures for longer periods of time, See Note (b) of Table PW-39-1

ect on : an atory equ rements or o a e - -








For Exemptions (Non-Mandatory conditions) of PWHT, See Note (a) (c) of Table PW-39-2


Min. Holding Temperature: 1,100 °F (595 °C)Min. Holding Time at Normal Temperature for Weld Thickness (Nominal):




For Exemptions (Non-Mandatory conditions) of PWHT, See Note (a) (c) of Table PW-39-2







PWHT is Mandatory for P-No. 3 Group No. 3 materials by Table PW-39-2:





For PWHT at lower temperatures for longer periods of time, See Note (b) of Table PW-39-2

Heating rate: The weldment shall be heated slowly to the holding temperature, Min. 100 °F/hr (55 °C/hr)

ASME Section I, Power B









Over 2 in. (50 mm) to 5 in. (125 mm): 1 hr/in. (1hr/25 mm)Over 5 in. (125 mm): 5 hr plus 15 min for each additional inch over 5 in. (125 mm)







Over 2 in. (50 mm) to 5 in. (125 mm): 1 hr/in. (1hr/25 mm)


ASME Section I: Mandatory Requirements for PWHT of Table PW-39-4

For Exemptions (Non-Mandatory conditions) of PWHT, See Notes (a) (b) (d) of Table PW-39-4

When PWHT is Mandatory for P-No. 5A Group No. 1 by Table PW-39-4:







Cooling rate: Cool slowly in a still atmosphere to a temperature not exceeding 800 °F (425 °C)

Heating and Cooling Rate for thicknesses of 2 in. (50 mm) or greater: Above 800 °F (425 °C), Maximum

rates 600 °F/hr (335 °C/hr) divided by the thickness in inches, but in no case should it be more than 600

°F/hr (335 °C/hr); Minimum rates 100 °F/hr (55 °C/hr); From 800 °F (425 °C) or below, the pressure part

should be cooled in still air.


For Exemptions (Non-Mandatory conditions) of PWHT, See Notes (a) (b) (d) of Table PW-39-4

When PWHT is Mandatory for P-No. 5B Group No. 1 by Table PW-39-4:







Cooling rate: Cool slowly in a still atmosphere to a temperature not exceeding 800 °F (425 °C)Heating and Cooling Rate for thicknesses of 2 in. (50 mm) or greater: Above 800 °F (425 °C), Maximum







For Exemptions (Non-Mandatory conditions) of PWHT, See Notes (a) (b) of Table PW-39-5

When PWHT is Mandatory for P-No. 15E Group No. 1 by Table PW-39-5:Min. Holding Temperature: 1,350 °F (730 °C)

Max. Holding Temperature: 1,425 °F (775 °C)

For some changes to above Holding Temperature, See Notes (1) (2) (3) (4) of Table PW-39-5





















rates 600 °F/hr (335 °C/hr) divided by the thickness in inches, but in no case should it be more than 600°F/hr (335 °C/hr); Minimum rates 100 °F/hr (55 °C/hr); From 800 °F (425 °C) or below, the pressure part










Heating rate: The weldment shall be heated slowly to the holding temperature, Min. 100 °F/hr (55 °C/hr)Cooling rate: Cool slowly in a still atmosphere to a temperature not exceeding 800 °F (425 °C)












Up to 2 in. (50 mm): 1 hr/in. (1hr/25 mm), 15 min Min.Over 2 in. (50 mm) to 5 in. (125 mm): 1 hr/in. (1hr/25 mm)








ASME Section I: Mandatory Requirements for PWHT of Table PW-39-7For Exemptions (Non-Mandatory conditions) of PWHT, See Note (b) of Table PW-39-7







Note (a) of Table PW-39-7: PWHT for P-No. 7 material shall be performed as described in PW-39.3

(soak band), except that the cooling rate shall be maximum of 100 °F/hr (55 °C/hr) in the range above

1200 °F (650 °C) after which the cooling rate shall be sufficiently rapid to prevent embrittlement.


For Exemptions (Non-Mandatory conditions) of PWHT, See Note (b) of Table PW-39-7







Note (a) of Table PW-39-7: PWHT for P-No. 7 material shall be performed as described in PW-39.3

(soak band), except that the cooling rate shall be maximum of 100 °F/hr (55 °C/hr) in the range above

1200 °F (650 °C) after which the cooling rate shall be sufficiently rapid to prevent embrittlement.

ASME Section I: Mandatory Requirements for PWHT of Table PW-39-8PWHT is neither required nor prohibited for joints between austenitic stainless steels of the P-No. 8

group.


PWHT is neither required nor prohibited for joints between austenitic stainless steels of the P-No. 8

group.





group.



group.




Up to 2 in. (50 mm): 1 hr/in. (2 min/mm), 15 min Min.

Over 2 in. (50 mm): 1 hr/in. (1hr/25 mm)

Heating rate for material of P-No. 10I Group No. 1***: The weldment shall be heated slowly to the holding

temperature, Min. 100 °F/hr (55 °C/hr)

Cooling rate for material of P-No. 10I Group No. 1***: Cool slowly in a still atmosphere to a temperature

not exceeding 800 °F (425 °C)Heating and Cooling Rate for thicknesses of 2 in. (50 mm) or greater ***: Above 800 °F (425 °C),

Maximum rates 600 °F/hr (335 °C/hr) divided by the thickness in inches, but in no case should it be more

than 600 °F/hr (335 °C/hr); Minimum rates 100 °F/hr (55 °C/hr); From 800 °F (425 °C) or below, the

pressure part should be cooled in still air.

***As Note of Table PW-39-10, PWHT for P-No. 10I (for SA-268 TP446 material only), shall be

performed as described in PW-39.3 (soak band), except that the cooling rate shall be maximum of 100

°F/hr (55 °C/hr) in the range above 1200 °F (650 °C) after which the cooling rate shall be sufficiently rapid

to prevent embrittlement.


PWHT is neither required nor prohibited for joints between materials of the P-No. 31






There is no data for this material on this Table.




ASME Section I: Mandatory Requirements for PWHT of Tables PW-39-1 through PW-39-13

There is no data for this material on these Tables.





ASME Section I: Mandatory Requirements for PWHT of Tables PW-39-1 through PW-39-13There is no data for this material on these Tables.












ASME Section I: Mandatory Requirements for PWHT of Table PW-39-9PWHT is neither required nor prohibited for joints between materials of P-No. 10H Group No. 1

(For Alloy S31803, See Table PW-39-9 for heat treatment information, only if applied.)






































There is no data for this material on these Tables.PWHT requirements shall be based on Welding Procedure Specification (WPS).


























































































Preheat

ASME Section I: Minimum Temperatures for Preheating of Appendix A (A-100.4)






in excess of 0.30% and a thickness at the joint in excess of 1 in. (25 mm):(b) 50 °F (10 °C) for all other materials of P-No. 1 Group No. 2






(a) 175 °F (80 °C) for material which has either a specified minimum tensile strengthin

excess of 70,000 psi (480 MPa) or a thickness at the joint in excess of 5/8 in. (16

mm):



(a) 175 °F (80 °C) for material which has either a specified minimum tensile strength

in


mm):




in


mm):


oilers




(a) 250 °F (120 °C) for material which has either a specified minimum tensile

strength in


mm):(b) 50 °F (10 °C) for all other materials of P-No. 4 Group No. 1



strength in


mm):




strength in



(b) 300 °F (150 °C) for all other materials of P-No. 5A group No.1


(a) 400 °F (205 °C) for material which has either a specified minimum tensilestrength in



(b) 300 °F (150 °C) for all other materials of P-No. 5B group No.1





strength in



(b) 300 °F (150 °C) for all other materials of P-No. 15E Group No. 1




















There is no data for this material on this Appendix

Preheat requirements shall be based on Welding Procedure Specification (WPS)





300 °F (150 °C) with interpass temperature maintained between 350 °F and 450 °F

(175 °C and 230 °C) for materials of P-No. 10I Group No. 1





















ASME Section I: Minimum Temperatures for Preheating of Appendix A (A-100.4)There is no data for this material on this Appendix




















ASME Section I: Minimum Temperatures for Preheating of Appendix A (A-100.4)There is no data for this material on this Appendix







































There is no data for this material on this AppendixPreheat requirements shall be based on Welding Procedure Specification (WPS)


























































































PWHT . : equ rements or o a e

For Exemptions (Non-Mandatory conditions) of PWHT, See Notes (a) (b) of Table 132

When PWHT is Mandatory for P-No. 1 materials by Table 132:

Holding Temperature Range: 1,100 °F (600 °C) to 1,200 °F (650 °C)

Upper limit temperature range is a recommended value, See Clause 132.2

Holding Time Based on Nominal Thickness:

Up to 2 in. (50 mm): 1 hr/in. (2.4 min/mm), 15 min Min.

Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch over 2 in. (50 mm) . : equ rements or o a e






Up to 2 in. (50 mm): 1 hr/in. (2.4 min/mm), 15 min Min.Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch over 2 in. (50 mm)

. : equ rements or o a e








For Exemptions (Non-Mandatory conditions) of PWHT, See Note (a) of Table 132


Holding Temperature Range: 1,100 °F (600 °C) to 1,200 °F (650 °C)Upper limit temperature range is a recommended value, See Clause 132.2











ASME B31.1: Requirements for PWHT of Table 132

There is no data for this material on this Table


ASME B31.1, Pow




For Exemptions (Non-Mandatory conditions) of PWHT, See Notes (a) (b) (c) (d) of Table 132





Up to 2 in. (50 mm): 1 hr/in. (2 min/mm), 15 min Min.Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch over 2 in. (50 mm)











When PWHT is Mandatory for P-No. 5A Gr. No. 1 materials by Table 132:






Heating and Cooling Rate: Above 600 °F (315 °C), the rate shall not exceed 600 °F (315 °C) per

hr divided by one-half the maximum thickness of material in inches at the weld, but in no case

shall the rate exceed 600 °F (315 °C) per hr

ASME B31.1: Requirements for PWHT of Table 132 for P-No. 5B Group No. 1




Up to 2 in. (50 mm): 1 hr/in. (2.4 min/mm), 15 min Min.Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch over 2 in. (50 mm)















See Notes (a) (b) (c) (d) of Table 132 for variations from above PWHT holding temperature in

certain conditions for P-No. 15E Gr. No. 1 materials.









shall the rate exceed 600 °F (315 °C) per hr ***For Exemptions (Non-Mandatory conditions) of PWHT for P-No. 6 Type 410 material, See

Notes (a) (b) (c) of Table 132






Over 2 in. (50 mm): 2 hr plus 15 min for each additional inch over 2 in. (50 mm)Heating and Cooling Rate: Above 600 °F (315 °C), the rate shall not exceed 600 °F (315 °C) per



***For Exemptions (Non-Mandatory conditions) of PWHT for P-No. 6 Type 410 material, See






Upper limit temperature range is a recommended value, See Clause 132.2Holding Time Based on Nominal Thickness:











Holding Time Based on Nominal Thickness:Up to 2 in. (50 mm): 1 hr/in. (2.4 min/mm), 15 min Min.





Cooling Rate for P-No. 7 materials: In lieu the cooling rate described above, cooling rate shall be

no greater than 100 °F (55 °C) per hr in the range above 1200 °F (650 °C), after which the

cooling rate shall be sufficiently rapid to prevent embrittlement.


Note (b) of Table 132



Upper limit temperature range is a recommended value, See Clause 132.2Holding Time Based on Nominal Thickness:






Cooling Rate for P-No. 7 materials: In lieu the cooling rate described above, cooling rate shall be

no greater than 100 °F (55 °C) per hr in the range above 1200 °F (650 °C), after which the



Note (b) of Table 132

ASME B31.1: Requirements for PWHT of Table 132PWHT is neither required nor prohibited for joints between

austenitic stainless steels of the P-No. 8 group.


PWHT is neither required nor prohibited for joints between











Exemptions: For nominal thickness of 1/2 in. (13 mm) or less, PWHT is neither

required nor prohibited, for P-No. 10I Gr. No. 1 materials.

PWHT Requirements for thickness above 1/2 in. (13 mm):



Holding Time Based on Nominal Thickness:Up to 2 in. (50 mm): 1 hr/in., 15 min Min.

Over 2 in. (50 mm): 1 hr/in. (25 mm)




Cooling Rate for P-No. 10I materials: In lieu the cooling rate described above, cooling rate shall

be no greater than 100 °F (55 °C) per hr in the range above 1200 °F (650 °C), after which the




















When PWHT is Mandatory for P-No. 9B Gr. No. 1 materials by Table 132:Holding Temperature Range: 1,100 °F (600 °C) to 1,175 °F (630 °C)





For PWHT at lower temperatures for longer periods of time, See Note (b) of Table 132



















PWHT is neither required nor prohibited for P-No. 10H Gr. No. 1 materials.In case of performing heat treatment, follow temperature range listed on 'General Note' of Table

132 for the particular alloy.






































There is no data for this material on this TablePWHT requirements shall be based on Welding Procedure Specification (WPS).


























































































Preheat . : n mum re eat ng equ rements, as per ause .

175 °F (80 °C) for material which has both a specified maximum carbon

content in excess of 0.30% and a thickness at the joint in excess of 1 in.

(25 mm) for materials of P-No. 1

50 °F (10 °C) for all other conditions for materials of P-No. 1

[Thickness referred to is the greater of the nominal thicknesses at the weld of the parts

to be joined.]. : n mum re eat ng equ rements, as per ause .





[Thickness referred to is the greater of the nominal thicknesses at the weld of the partsto be joined.]

. : n mum re eat ng equ rements, as per ause .







175 °F (80 °C) for material which has either a specified minimum tensile strength

in excess of 60,000 psi (413.7 MPa) or a thickness at the joint in excess of 1/2 in.
















to be joined.]

r Piping



ASME B31.1: Minimum Preheating Requirements, as per Clause 131.4250 °F (120 °C) for all materials of P-No. 4

ASME B31.1: Minimum Preheating Requirements, as per Clause 131.4

250 °F (120 °C) for all materials of P-No. 4



in

excess of 60,000 psi (413.7 MPa) or has both a specified minimum chromium content

above 6.0% and a thickness at the joint in excess of 1/2 in. (13 mm)

(b) 300 °F (150 °C) for all other materials of P-No. 5A


to be joined.]



in

excess of 60,000 psi (413.7 MPa) or has both a specified minimum chromium contentabove 6.0% and a thickness at the joint in excess of 1/2 in. (13 mm)

(b) 300 °F (150 °C) for all other materials of P-No. 5B


to be joined.]








Minimum 50 °F (10 °C)














300 °F (150 °C) with an interpass temperature of 450 °F (230 °C) maximum

For materials of P-No. 10I






Minimum 50 °F (10 °C). : n mum re eat ng equ rements, as per ause .

175 °F (80 °C) for material which has both a specified maximum carboncontent in excess of 0.30% and a thickness at the joint in excess of 1 in.




to be joined.]








250 °F (120 °C) for all materials of P-No. 9A




300 °F (150 °C) for all materials of P-No. 9B







































ASME B31.1: Minimum Preheating Requirements, as per Clause 131.4Minimum 50 °F (10 °C)




















































PWHT

ASME B31.3: Requirements for PWHT of Table 331.1.1

PWHT is not required for thickness up to 3/4 in. (20 mm) for P-No. 1 materials

PWHT Requirements for Thickness above 3/4 in. (20 mm):


Upper limit temperature range is a recommended value


Over 3/4 in. (20 mm): 1 hr/in (2.4 min/mm), 1hr Min.






Holding Time Based on Nominal Thickness:Over 3/4 in. (20 mm): 1 hr/in (2.4 min/mm), 1hr Min.







Over 3/4 in. (20 mm): 1 hr/in (2.4 min/mm), 1hr Min.. : equ rements or o a e . .

PWHT for thickness up to 3/4 in. (20 mm) is not required, when

Min. Tensile Strength is not greater than 71 ksi (490 MPa) for P-No. 3 materials

PWHT Requirements for thickness above 3/4 in. (20 mm) or for any thicknesses,When Min. Tensile Strength is above 71 ksi (490 MPa):



Holding Time Based on Nominal Thickness: 1 hr/in (2.4 min/mm), 1hr Min. . : equ rements or o a e . .



PWHT Requirements for thickness above 3/4 in. (20 mm) or for any thicknesses,

When Min. Tensile Strength is above 71 ksi (490 MPa):



Holding Time Based on Nominal Thickness: 1 hr/in (2.4 min/mm), 1hr Min. . : equ rements or o a e . .







Holding Time Based on Nominal Thickness: 1 hr/in (2.4 min/mm), 1hr Min.

ASME B31.3, Pr



. : equ rements or o a e . .






Upper limit temperature range is a recommended valueHolding Time Based on Nominal Thickness: 1 hr/in (2.4 min/mm), 2hr Min.

. : equ rements or o a e . .









-PWHT for thickness up to 1/2 in. (13 mm) is not required, when

<= 3% Cr and <= 0.15% C for P-No. 5A materials

-PWHT for thickness greater than 1/2 in. (13 mm), when

<= 3% Cr and <= 0.15% C for P-No. 5A materials, (OR)

-PWHT for all Nominal Thickness sizes, when > 3% Cr and > 0.15% C:



Holding Time Based on Nominal Thickness: 1 hr/in (2.4 min/mm), 2 hr Min.

Brinell Hardness Requirement to verify PWHT: 241 Max.



<= 3% Cr and <= 0.15% C for P-No. 5B materials


<= 3% Cr and <= 0.15% C for P-No. 5B materials, (OR)

-PWHT for all Nominal Thickness sizes, when > 3% Cr and > 0.15% C:Holding Temperature Range: 1,300 °F (704 °C) to 1,400 °F (760 °C)







PWHT Requirements for P-No. 15E materials:






PWHT Requirements for high alloy steels martensitic of P-No. 6 materials:


Upper limit temperature range is a recommended valueHolding Time for all Nominal Thickness sizes: 1 hr/in (2.4 min/mm), 2 hr Min.




Holding Temperature Range: 1,350 °F (732 °C) to 1,450 °F (788 °C)Note: PWHT Requirements for A 240 Gr. 429 of P-No. 6 materials:



Holding Time for all Nominal Thickness sizes: 1 hr/in (2.4 min/mm), 2 hr Min.











PWHT is not required for joints between

High alloy steels ferritic materials of the P-No. 7 materials.



High alloy steels ferritic materials of the P-No. 7 materials.

ASME B31.3: Requirements for PWHT of Table 331.1.1PWHT is not required for joints between

High alloy steels austenitic material of the P-No. 8 materials.















Holding Time for all Nominal Thickness sizes: 1 hr/in (2.4 min/mm), 1hr Min.

For P-No. 10I materials, Cooling rate to 649 °C (1200 °F) shall be less than 56 °C (100

°F)/hr: thereafter, the cooling rate shall be fast enough to prevent embrittlement.










ASME B31.3: Requirements for PWHT of Table 331.1.1PWHT is not required for thickness up to 3/4 in. (20 mm) for P-No. 1 materials





Over 3/4 in. (20 mm): 1 hr/in (2.4 min/mm), 1hr Min.



ASME B31.3: Requirements for PWHT of Table 331.1.1-PWHT for thickness up to 1/2 in. (13 mm) is not required, when

<= 3% Cr and <= 0.15% C for P-No. 5C materials


<= 3% Cr and <= 0.15% C for P-No. 5C materials, (OR)













PWHT for thickness up to 3/4 in. (20 mm) is not required for P-No. 9A materials



Upper limit temperature range is a recommended valueHolding Time Based on Nominal Thickness:

Over 3/4 in. (20 mm): 1/2 hr/in (1.2 min/mm), 1hr Min.




PWHT for thickness up to 3/4 in. (20 mm) is not required for P-No. 9B materials





Over 3/4 in. (20 mm): 1/2 hr/in (1.2 min/mm), 1hr Min.
















PWHT is neither required nor prohibited for joints between duplex stainless steels of the

P-No. 10H materials, however any heat treatment applied shall be as required in the

material specification.When performing PWHT:

Holding Time for all Nominal Thickness sizes: 1/2 hr/in (1.2 min/mm), 1/2 hr Min.





PWHT for thickness up to 2 in. (51 mm) is not required for P-No. 11A Gr.No.1

PWHT Requirements for Thickness above 2 in. (51 mm):




Over 2 in. (51 mm): 1 hr/in (2.4 min/mm), 1 hr Min.

Cooling rate shall be > 167 °C (300 °F)/hr to 316 °C (600 °F)




PWHT for thickness up to 2 in. (51 mm) is not required for P-No. 11A Gr.No.2PWHT Requirements for Thickness above 2 in. (51 mm):




Over 2 in. (51 mm): 1 hr/in (2.4 min/mm), 1 hr Min.

Cooling rate shall be > 167 °C (300 °F)/hr to 316 °C (600 °F)































There is no data for this material on this code.








Holding Time for all Nominal Thickness sizes: 1/2 hr/in (1.2 min/mm), 1/2 hr Min.

For material of P-No. 10 (Cr-Cu steel), Cool as rapidly as possible after the hold period.




Holding Time for all Nominal Thickness sizes:

Heat treat within 14 days after welding. Holding time shall be increased

by 1/2 hr for each 25 mm (1 in.) over 25 mm thickness, 1hr Min.For material of P-No. 62, Cool to 427 °C (800 °F) at a rate <= 278 °C (500 °F)/hr, per 25

mm (1 in.) nominal thickness, 278 °C (500 °F)/hr Max. Cool in still air from 427 °C (800

°F).












Holding Temperature Range: 1,300 °F (704 °C) to 1,400 °F (760 °C)Upper limit temperature range is a recommended value











Holding Time Based on Nominal Thickness: 1 hr/in (2.4 min/mm), 2 hr Min.Brinell Hardness Requirement to verify PWHT: 241 Max.









































































Preheat . : n mum re eat emperatures, as or a e . .

Preheating is not required for P-No. 1, but recommended.

Recommended preheat based on Nominal Wall Thickness:

Thickness less than 1 in. (25 mm): 50 °F (10 °C)

Thickness including and above 1 in. (25 mm): 175 °F (79 °C)

For all thicknesses, when Specified Min. Tensile Strength is above 71 ksi (490 MPa):

175 °F (79 °C)

[Thickness referred to is the greater of the nominal thicknesses at the weld of the. : n mum re eat emperatures, as or a e . .






175 °F (79 °C)[Thickness referred to is the greater of the nominal thicknesses at the weld of the

. : n mum re eat emperatures, as or a e . .






175 °F (79 °C)

[Thickness referred to is the greater of the nominal thicknesses at the weld of the. : n mum re eat emperatures, as or a e . .



Thickness less than 1/2 in. (13 mm): 50 °F (10 °C)Thickness including and above 1/2 in. (13 mm): 175 °F (79 °C)


175 °F (79 °C)

[Thickness referred to is the greater of the nominal thicknesses at the weld of the

ASME B31.3: Preheating from Table 330.1.1

Preheating is not required for P-No. 3 group.


Including and above 1/2 in. (13 mm): 175 °F (80 °C)

When Specified Min. Tensile Strength is above 71 ksi (490 MPa): 175 °F (80 °C)

. : n mum re eat emperatures, as or a e . .



Thickness less than 1/2 in. (13 mm): 50 °F (10 °C)

Thickness including and above 1/2 in. (13 mm): 175 °F (79 °C)


175 °F (79 °C)


cess Piping



ASME B31.3: Minimum Preheat Temperatures, as for Table 330.1.1Required Min. Preheating Temp. for P-No. 4 materials: 300 °F (149 °C)

ASME B31.3: Minimum Preheat Temperatures, as for Table 330.1.1

Required Min. Preheating Temp. for P-No. 4 materials: 300 °F (149 °C)


Required Min. Preheating Temp. for P-No. 5A materials: 350 °F (177 °C)


Required Min. Preheating Temp. for P-No. 5B materials: 350 °F (177 °C)




Required Min. Preheating Temp. for P-No. 15E materials: 400 °F (204 °C)


Preheating is not required for P-No. 6, but recommended.Recommended Min. preheat: 300 °F (149 °C), and

Maximum interpass temperature of 600 °F (316 °C).



Recommended Min. preheat: 300 °F (149 °C), and








Recommended Min. preheat: 50 °F (10 °C)





Required Min. Preheating Temp. for P-No. 10I materials: 300 °F (149 °C), with

Maintain interpass temperature between 177 °C-232 °C (350 °F-450 °F)


Preheating is not required for these materials, but recommended.







Recommended Min. preheat: 50 °F (10 °C). : n mum re eat emperatures, as or a e . .

Preheating is not required for P-No. 1, but recommended.Recommended preheat based on Nominal Wall Thickness:




175 °F (79 °C)





Required Min. Preheating Temp. for P-No. 5C materials: 350 °F (177 °C)



Recommended Min. preheat: 300 °F (149 °C), and


ASME B31.3: Minimum Preheat Temperatures, as for Table 330.1.1Preheating is not required for P-No. 9A, but recommended.





Preheating is not required for P-No. 9B, but recommended.
















ASME B31.3: Minimum Preheat Temperatures, as for Table 330.1.1There is no data for this material on this Table.






Preheating is not required for P-No. 11A Group No. 1, but recommended.

Recommended preheat: 50 °F (10 °C)




Required Min. Preheating Temp. for P-No. 11A Group No. 2: 50 °F (10 °C)



























There is no data for this material on this TablePreheat requirements shall be based on Welding Procedure Specification (WPS).










Required Min. Preheating Temp. for P-No. 10 materials (Cr-Cu steel):

300 °F (149 °C) to 400 °F (204 °C)











ASME B31.3: Minimum Preheat Temperatures, as for Table 330.1.1Required Min. Preheating Temp. for P-No. 5C materials: 350 °F (177 °C)





Recommended preheat: 50 °F (10 °C)





There is no data for this material on this TablePreheat requirements shall be based on Welding Procedure Specification (WPS).
















Preheating is not required for these materials, but recommended.Recommended Min. preheat: 50 °F (10 °C)





































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Asme Pwht Preheat