17YRS
WU JII INDUSTRY CO., LTD.
886-4-23593510
886-4-23593529
No. 1, 20th Rd., Industrial Park, Taichung City, Taiwan
www.wujii.com.tw

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Heat-treatment Information
Heat-treatment Information
1.2379

Specification

DIN material NO.:1.2379 ISO-B 
Code:X155CrMo121 
Comparable standards : AISI D2

Chemical 
composition

C

Cr

Mo

V

Mn

Si

1.55

11.5

0.7

1.0

0.36

0.3

Steel properties : Ledeburitic-high-carbon high chromium steel. Highest wear-resistance, good toughness. Best edge-holding quality and retention to tempering; the steel can be nitrided after a special heat treatment.

Applications : Thread rollings and thread rolling dies, cold extrusion tools, blanking and stamping tools, circular shear blades, deep drawing tools, pressure pads and highly wear-resistant plastic moulds.

Heat 
treatment
Soft annealing Cooling Hardness
830~860°C Slow in the furnace HB250max
Hardening Cooling Hardness after quenching
1000~1050°C 500~550°C oil or hot bath HRC63
Tempering°C

100

200

300

400

500

525

550

600

HRC

63

61

58

58

58

60

56

50

Special 
heat 
treatment
Higher temperature hardening Cooling Hardness after quenching
1050~1080°C 500~550°C oil or hot bath HRC61
3 rd tempering °C

100

200

300

400

500

525

550

600

HRC

61

60

58

59

62

62

57

50

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