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Evaluation of Special Quality Die Steels
NADCA Project
Die Materials CommitteePurdue – Oct. 2009
BohlerUddeholm Dievar Thyssen E38K Thyssen 2367 Ellwood ExELL Tuf-Die SAMPLES-Phase I4- 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 II4- 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).
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 (44-46HRC)
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 19 19 19.7
CAPABILITY HEAT TREATMENT (Oil Quench and Triple Tempered to 44-46HRC)
C DBOHLER-
UDDEHOLM DIEVAR45 min
@1850 F OIL 1080 F
C 2SCHMOLZ & BIKENBACH 2367
45 min 1885 F OIL 1080 F
E ESCHMOLZ & BIKENBACH E38K
45 min 1850 F OIL 1070 F
E TELLWOOD SPECIALTY TUF-DIE
45 min 1885 F OIL 1080 F
NADCAGRADE
ID SUPPLIER TYPE AUSTENITIZING TEMPERx3
CAPABILITY HEAT TREATMENT (48-50HRC)
ID HRC 1 2 3 4 5 Av.
Dievar 48.6 11 11 11 12 13 11.3
2367 48.5 8 8 9 10 10 9.0
E38K 49.2 12 13 13 14 14 13.3
Tuf-Die 49.4 12 12 13 13 16 12.7
CAPABILITY HEAT TREATMENT (Oil Quench and Triple Tempered to 48-50HRC)
Charpy V-notch of Special Steels
0
5
10
15
20
25
Dievar 2367 E38K Tuf-Die
Steel
Ch
arp
y V
-no
tch
(ft
*lb
s)
44-46HRC
48-50HRC
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(Triple Tempered to 44-46HRC)
0
2
4
6
8
10
12
14
16
18
1 2 3
Thermal cycles
Ave
rage
Max
Cra
ck L
engt
h (X
100u
m)
D2T2E222H13
5000 10000 15000
Average Maximum Crack LengthSuperior Steels (Oil quench)
44-46HRC
0
20
40
60
80
100
120
140
160
180
1 2 3
Thermal cycles
Tota
l Cra
ck A
rea
(x10
6 um
2 )
D2T2E222H13
5000 10000 15000
Total Crack AreaSuperior Steels (Oil Quench)
44-46HRC
Average Maximum Crack LengthSuperior Steels (Vacuum Quench)
0
2
4
6
8
10
12
14
16
18
1 2 3
Cycle Number
Ave
rage
Max
Cra
ck L
engt
h
(X 1
00um
)
D1T1E121H13
5000 10000 15000
44-46HRC
Total Crack AreaSuperior Steels (Vacuum Quench)
44-46HRC
SET-UP for Vacuum Heat Treatment of the Special Steels