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