Evaluation of Special Quality Die Steels

NADCA Project

Die Materials Specifications Task GroupWheeling, IL - February 2009

BohlerUddeholm Dievar Thyssen E38K Thyssen 2367 Ellwood ExELL Tuf-Die  SAMPLES4- Thermal fatigue samples quenched in oil, triple tempered to 44-46HRC 10- Charpy V-notch, heat treated in oil and triple tempered to 44-46HRC. 

4- Thermal fatigue samples quenched in a vacuum furnace and triple tempered to 44-46HRC (welded to a 16” block).  10- Charpy V-notch quenched in oil and triple tempered to 44- 46HRC (cut from plate that was welded to a 16” block).

STEELS

Flow Chart for Die Steel Evaluation

Cut blanks for Thermal Fatigue and Charpy V-notch

Receive steel block – mark grain orientation

Rough machine CVN “potential”

Oil quench CVN “potential”

Vacuum quench Thermal Fatigue and CVN plate

Rough machine Thermal Fatigue and CVN plate

Finish/ Grind Thermal Fatigue and Charpy V-notch

Test Thermal Fatigue and Charpy V-notch Impact

Report Thermal Fatigue and CVN Results

Cutting line

8’’

7’’

8’’

2.125’’

2.125’’

2.125’’

2.125’’

2.125’’

Charpy impact specimens are taken from the “red” bar as shown in page 2.

2.215’’

2.3’’

* taken from a 12" thick x 10" wide slab

Thickness direction

Length direction

2367 and E38K

C DBOHLER-

UDDEHOLM DIEVAR 1850 F OIL 1125 F

C 2SCHMOLZ & BIKENBACH 2367 1885 F OIL 1125 F

E ESCHMOLZ & BIKENBACH E38K 1850 F OIL 1115 F

E TELLWOOD SPECIALTY TUF-DIE 1885 F OIL 1125 F

NADCAGRADE

ID SUPPLIER TYPE AUSTENITIZING TEMPERx3

CAPABILITY HEAT TREATMENT

ID HRC 1 2 3 4 5 Av.

Dievar 44 21 21 21 20 20 20.7

2367 46 14 14 13 12 12 13.3

E38K 44 24 23 23 22 22 22.7

Tuf-Die 45 21 20 20 10 19 19.7

CAPABILITY HEAT TREATMENT (Oil Quench)

ID HRC 1 2 3 4 5 Av. % of Capability

Dievar 43.7 18 18 17 17 16 17.3 84%

2367 42.3 15 14 14 14 13 14.0 105%

E38K 43.0 16 16 15 15 15 15.3 68%

Tuf-Die

44.0 17 16 16 16 14 16.0 81%

VACUUM HEAT TREATMENT

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Thermal cycles

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Average Maximum Crack LengthSuperior Steels (Oil quench)

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Total Crack AreaSuperior Steels (Oil Quench)

Average Maximum Crack LengthSuperior Steels (Vacuum Quench)

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D1T1E121H13

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Total Crack AreaSuperior Steels (Vacuum Quench)

SET-UP for Vacuum Heat Treatment of the Special Steels