Evaluation of Special Quality Die Steels NADCA Project Die Materials Committee Purdue – Oct. 2009

STEELS BohlerUddeholm Dievar Thyssen E38K Thyssen 2367 Ellwood ExELL Tuf-Die   SAMPLES-Phase I 4- Thermal fatigue samples quenched in oil, triple tempered to 44-46HRC 5- 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).  5- Charpy V-notch quenched in vacuum and triple tempered to 44- 46HRC (cut from plate that was welded to a 16” block).

STEELS BohlerUddeholm Dievar Thyssen E38K Thyssen 2367 Ellwood ExELL Tuf-Die   SAMPLES-Phase II 4- Thermal fatigue samples quenched in oil, triple tempered to 48-50HRC 5- Charpy V-notch, heat treated in oil and triple tempered to 48-50HRC.  4- Thermal fatigue samples quenched in a vacuum furnace and triple tempered to 48-50HRC (welded to a 16” block).  5- Charpy V-notch quenched in vacuum and triple tempered to 48- 50HRC (cut from plate that was welded to a 16” block).

Report Thermal Fatigue and CVN Results Flow Chart for Die Steel Evaluation Receive steel block – mark grain orientation Cut blanks for Thermal Fatigue and Charpy V-notch Rough machine CVN “potential” Rough machine Thermal Fatigue and CVN plate Oil quench CVN “potential” Vacuum quench 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

Length direction Thickness direction Cutting line 8’’ 7’’ 2.125’’ Charpy impact specimens are taken from the “red” bar as shown in page 2. 2.215’’ 2.3’’ Length direction Thickness direction * taken from a 12" thick x 10" wide slab

2367 and E38K

CAPABILITY HEAT TREATMENT (44-46HRC) NADCA GRADE ID SUPPLIER TYPE AUSTENITIZING TEMPERx3 C D BOHLER-UDDEHOLM DIEVAR 1850 F OIL 1125 F 2 SCHMOLZ & BIKENBACH 2367 1885 F E E38K 1115 F T ELLWOOD SPECIALTY TUF-DIE

CAPABILITY HEAT TREATMENT (Oil Quench and Triple Tempered to 44-46HRC) ID HRC 1 2 3 4 5 Av. Dievar 44 21 20 20.7 2367 46 14 13 12 13.3 E38K 24 23 22 22.7 Tuf-Die 45 19 19.7

CAPABILITY HEAT TREATMENT (48-50HRC) NADCA GRADE ID SUPPLIER TYPE AUSTENITIZING TEMPERx3 C D BOHLER-UDDEHOLM DIEVAR 45 min @1850 F OIL 1080 F 2 SCHMOLZ & BIKENBACH 2367 45 min 1885 F E E38K 45 min 1850 F 1070 F T ELLWOOD SPECIALTY TUF-DIE

CAPABILITY HEAT TREATMENT (Oil Quench and Triple Tempered to 48-50HRC) ID HRC 1 2 3 4 5 Av. Dievar 48.6 11 12 13 11.3 2367 48.5 8 9 10 9.0 E38K 49.2 14 13.3 Tuf-Die 49.4 16 12.7

(Triple Tempered to 44-46HRC) VACUUM HEAT TREATMENT (Triple Tempered to 44-46HRC) ID HRC 1 2 3 4 5 Av. % of Capability Dievar 43.7 18 17 16 17.3 84% 2367 42.3 15 14 13 14.0 105% E38K 43.0 15.3 68% Tuf-Die 44.0 16.0 81%

Average Maximum Crack Length Superior Steels (Oil quench) 44-46HRC

Superior Steels (Oil Quench) Total Crack Area Superior Steels (Oil Quench) 44-46HRC

Average Maximum Crack Length Superior Steels (Vacuum Quench) 44-46HRC

Superior Steels (Vacuum Quench) Total Crack Area Superior Steels (Vacuum Quench) 44-46HRC

SET-UP for Vacuum Heat Treatment of the Special Steels