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है”ह”ह

IS 5789 (1993): Austenitic Spheroidal Graphite IronCastings for Pressure Containing Parts Suitable forLow-Temperature Service [MTD 6: Pig iron and Cast Iron]

IS 5789 : 1993

Indian Standard

-4USTENITIC SPHEROIDAL GRAPHITE IRON CASTINGS FOR PRESSURE CONTAINING

PARTS SUITABLE FOR LOW-TEMPERATURE SERVICE - SPECIFICATION

( First Revision )

UDC 669-131-7-14 : 669-15-196-56

,

@ BIS 1993

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

October 1993 Price Group 2

Pig Iron and Cast Iron Sectional Committee, MTD 6

FOREWORD

This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by the Pig Iron and Cast Iron Sectional Committee had been approved by the Metallurgical Engineering Division Council.

This standard was first published in 1970. While reviewing the standard, the committee decided to revise it to align with the present practice being followed by the Indian Industry.

Austenitic spheroidal graphite iron castings covered in this standard are used for compressors expanders, pumps, valves and other pressure containing parts intended primarily for low temper- ature service. These castings are characterized by having graphite substantially in spheroidal form and substantially free from flake graphite. They are essentially free of carbides and contain sufficient alloy content to produce stable austenitic matrix down to -234°C ( liquid hydrogen ).

In the formulation of this standard assistance has been derived from ASTM A 571 : 71 ‘Austenitic ductile iron castings for pressure containing parts suitable for low temperature service’ issued by the American Society for Testing and Materrals ( ASTM ).

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised)‘. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

IS 5789 : 1993

Indian Standard

AUSTENITIC SPHEROIDAL GRAPHITE IRON CASTINGS FOR PRESSURE CONTAINING

PARTS SUITABLE FOR LOW-TEMPERATURE SERVICE -- SPECIFICATION

( First Revision )

1 SCOPE

This standard covers the requirements for austenitic spheroidal graphite iron castings for pressure-containing parts used for low-temper- ature service.

2 REFERENCES

The following Indian Standards are necessary adjuncts to this standard:

IS No.

228

Title Methods for chemical analysis of steel

1387 : 1993

1500 : 1983

1608 : 1972

1757 : 1988

General requirements for the supply of metallurgical mate- rials ( second revision )

Method for Brine11 hardness test for metallic materials ( second revision )

Method for tensile testing of steel products (_fifirst revision )

Method for charpy impact test ( V notch ) for metallic materials ( second revision )

8350 : 1977 Deviations for untoleranced dimensions of spheroidal or nodular graphite iron castings

13655:1993 Guidelines for heat-treatment of cast iron

3 SUPPLY OF MATERIAL

General requirements relating to the supply of the material shall be as laid down in IS 1387 : 1993.

4 MANUFACTURE

The method of manufacture shall be left to the discretion of the manufacturer provided that the castings always conform to this standard.

1

5 CHEMICAL COMPOSITION

5.1 The castings, when tested in accordance with the relevant parts of IS 228 shall have the following chemical composition:

Constituent Percent

Total carbon 2.2 to 2.7 Silicon 1.5 to 2.5 Manganese 3.75 to 4.5 Nickel 21.0 to 24.0 Chromium 0.10 Max Phosphorus 0.08 Max

NOTE -For castings with section under 6 mm it may be desirable to adjust the total carbon to a maximum of 2.90 percent.

5.2 The chemical analysis shall be carried out either on drillings taken from test coupons, broken test specimen or castings.

6 WORKMANSHIP AND FINISH

6.1 The castings shall be accurately moulded in accordance with the pattern or working draw- ings supplied by the purchaser, with addition of such letters, figures or marks as may be specified.

6.2 The drawings shall specify the tolerance on all important dimensions. On other dimensions, tolerances according to IS 8350 : 1977 shall apply.

7 HEAT TREATMENT

7.1 Unless otherwise agreed to, all castings shall be heat treated in accordance with 5 of IS I3655 : 1993.

7.1.1 Heat treatment shall be performed before machining except in cases where re-heat treat- ment is necessary.

8 FREEDOM FROM DEFECTS

All castings shall be free from surface defects, such as burnt-on sand and shall be reasonably smooth. Runners, risers, fins and other extrane- ous metals shall be removed from the castings.

IS 5789 : 1993

9 TEST SAMPLES

9.1 Test samples shali be cast separately in sand moulds. They shall be poured from the same ladle of metal as used to produce the castings they represent and immediately after the cast- ings are poured. Recommendations regarding test samples are given in Annex A.

9.2 All test samples shall be heat-treated similar to, simultaneously with and adjacent to the castings or castings they represent.

10 SAMPLING FOR MECHANICAL TESTS

10.1 The test samples shall be cast from each ladle after pouring of minimum 50 percent of the ladle metal provided the manufacturer ensures nodularity in the first and last poured.

10.2 If successively treated ladles filled from one furnace are used to produce castings. tensile test shall be made from each ladle of metal it treated with nodulizing agent.

10.3 One tensile test at room temperature and three impact tests at the required low temper- ature shall be performed for each ladle treated with nodulizing agent unless otherwise specified.

11 MECHANICAL TESTS

11.1 Room Temperature Tests

11.1.1 Tensile Test

The tensile test shall be carried out in accor- dance with IS 1608 : 1972, unless otherwise agreed to between the purchaser and the manu- facturer. The test pieces shall have a gauge diameter of 14 mm and a gauge length of 70 mm

( see Fig. 1 ). To determine compliance for proof stress requirements the material tested shall be considered to have passed the test if it does not undergo any elongation exceeding the specified percentage on being subjected to the specified minimum stress for a period of 15 seconds.

II.l.l.l The tensile properties shall be as speci- fied below:

Characteristic Requirement

Tensile strength, MPa 430

Proof stress ( 0.2 percent ), 200 MPa, Min

Elongation percent, Min 25

NOTE - The method of fixing ends of the test pieces together with their kngth Lt may be agreed by users.

11.1.2 Hardness Test

The brine11 hardness of the material, when tested in accordance with IS 1500 : 1983 shall be between 120 to 180 HB. The hardness test shall preferably be carried out by using a ball of 10 mm diameter and a load of 3 000 kgf.

11.2 Low Temperature Impact Test

Notched bar impact properties of the castings shall be determined by testing a set of three Charpy V-notch test specimens as described in IS 1757 : 1988. The test temperature shall be agreed upon by mutual consent between the purchaser and the manufacturer. The average energy value of the three test specimens shall not be less than 2.1 kgf.m, with none of the individual value less than 1.4 kgf.m for test temperature down to and including - 19.X.

L, = original gauge length ( L,, = 5 din this case ), d = original diameter of the test piece, L, = parallel length L, > L,, and Lt = total length of test piece according to Le and Lt.

All dimensions in millimetres.

FIG. 1 TENSILE TEST PIECE

11.2.1 The Charpy V-notch beam type test shall be carried out using a notched test specimen 10 mm square as shown in Fig. 2. During this test the impact test specimens as well as the handling tongs shall be cooled fx a sufficient time in a suitable container so that both reach the desired temperature. The tempe- rature shall be measured with thermocouples, thermometers or any other suitable devices and shall be controlled within f 5°C. The specimen shall be quickly tra:isferred from the cooling device to the anvil of Charpy impact testing machine and broken with a time lapse of not more than 5 seconds.

12 RETEST

12.1 Retest for Chemical Analysis

If a sample selected for testing fails to meet the requirements specified under 5.1, the purchaser shall select two further samples from the same cast or ladle. If on testing, either of these samples fails to meet the specified requirements, the whole lot shall be deemed as not complying with the standard.

NOTE - If a sample selected for testing flils to meet the reqluircments specified under 5.1, the maau- facturer shall select two further samoles either on test sample or the drillings taken on the same h:at of the castings.

12.2 Should any of the original test pieces fail to pass any of the mechanical tests specified under 11.1 and 11.2 two further samples, which represent the same casting or castings, shall be selected and tested in the same manner. The manufacturer shall have the right, if he so desires, to reheat-treat ( not more than once ) the castings before the two further samples are selected. Should the two further samples satisfy the test requirements of this standard, the castings represented by them shall bc accepted.

HAMMER STRIKES HERE

13.1 Subject to mutual agreement between the purchaser and the manufacturer any one or more of the following tests may be agreed upon at the time of enquiry and order:

a) b)

c)

d)

Hydrostatic pressure test,

Radiographic or other non-destructive test,

Fracture test, ar,d

Micro-structure test.

IS 5789 : 1993

Should either of the retests fail, the castings represented shall be deemed as not complying with this standard.

12.2.1 Pn case of failure of any test specimen showing obvious casting defects, another test specimen shall be cut from the test sample or from another test sample representing the same metal and the results obtained from this substi- tuted for those obtained from the defective test specimen.

13 ADDITIONAL TEST

The details of these tests shall be agreed to between the pxchascr and the ma!lufacturer.

14 MARKING

The casti;lgs shall be legibly marked with the followi.:g particulars:

a) Indicating the source of manufacturer; and

b) Any other marking as agreed to between the purchaser and the supplier.

15 STANDARD MARK

The castings may also be marked with the Standard Mark.

-I-- --I- = -= --I 10 I+1 4 0

I/ L-i ,,+-

~~:: =-/

All dimensions in millimetr:s.

FIG. 2 CHARPY NOTCHED BEAM TYPE TEST PIECE, 10 mm3

I

I

I§ 5789 :1993

ANNEX A

( czuuse 9.1 )

RECOMMENDATIONS FOR TEST SAMPLES

A-l The test sample may be cast in sand and tional test piece are represented in Fig. 3. shall be sound and free from any casting defects. The thickness of the test samples shall A-3 Where the manufacturer wishes to demon-

be matched as closely as possible to the ruling strate the quality of the castings a convenient

section thickness of the casting. form of test sample cut from one of the

A-2 Suitable samples for providing a propor- castillgs, as agreed to between the purchaser and the manufacturer, may be used.

Dimension Tw I Type 2 Type 3 u 12 25 75 V 40 55 125 X 25 40 65 Y 135 140 175 2 A function of the test piece length

NOTE - The thickness of the sand mould surroun. ding the test sample during casting should be:

a) 40 mm for Type 1 and 2, and

b) 80 mm for Type 3.

All dimensions in millimetres.

FIG. 3 ‘Y’-TYPE TEST SAMPLES

4

Studard Mark

The use of the Standard Mark is governed by the pl ovisions of the Eureau of Indim S!un&r& Act, 2986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously cheked by BIS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards.