Evaluation of Special Quality Die Steels NADCA Project Die Materials Specifications Task Group
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Transcript of Evaluation of Special Quality Die Steels NADCA Project Die Materials Specifications Task Group
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Evaluation of Special Quality Die Steels
NADCA Project
Die Materials Specifications Task GroupWheeling, IL - February 2009
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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
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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
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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
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2367 and E38K
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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
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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)
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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
Ave
rage
Max
Cra
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engt
h (X
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D2T2E222H13
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Average Maximum Crack LengthSuperior Steels (Oil quench)
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Thermal cycles
Tota
l Cra
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6 um
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D2T2E222H13
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Total Crack AreaSuperior Steels (Oil Quench)
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Average Maximum Crack LengthSuperior Steels (Vacuum Quench)
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D1T1E121H13
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Total Crack AreaSuperior Steels (Vacuum Quench)
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SET-UP for Vacuum Heat Treatment of the Special Steels