MATERIAL

CHEMISTRY

HEAT TREATMENT DETAILS

AISI/
ASTM

EN

DIN

JIS

C

SI

Mn

Co

S

Cr

W

Mo

V

Anealing
(Slow Cooling)

Quenchent
(Hot Bath)

Quenching

Tempering
(Air Cooling)

Annealed
(HB) - Max

Quenched
(Hrc) Tempered

M2 

6/5/2 

1.3343 

SKH51 

0.9 

0.3 

0.3

4.1 

5

1.8

800-880 

OIL

1200-1240 

550-570 

255 

63 

M35 

6/5/2+5% 

1.3243

SKH55 

0.92 

0.35

0.3

4.1 

6.4

5 

1.9 

800-840 

OIL 

1200-1240

550-570

277

64 

M42 

2/10/1/8 

1.3247 

SKH59 

1.1 

0.25

0.25 

3.9 

1.4 

9.2 

1.2

820 -840

OIL 

1170-1210 

520-590

285 

66 

T1 

18/4/1 

1.3355 

SKH2

0.75

0.2

0.2 

4.1 

18 

1.1 

820-880

OIL

1250-1290 

560-580

248 

62 

HIGH SPEED STEEL

AISI

DIN

Supply Condition

Rounds

Square

Flat

Application

M2 

1.3343 

Annealed 

2 - 350

10 - 130 

20X10 - 700X65 

Twists, drills, die chasers, taps, rotating files, outlers, broaches, wood working tools. 

M35 

1.3243 

Annealed 

30 - 100 

Tools for roughing work at very high speed on steel and cast iron, high performance twist drills, cutters, taps. 

M42

1.3247 

Annealed 

8 - 120 

Tools used in processing of Ni, Ti, alloy steels.

T1 

1.3355 

Annealed 

12 - 65

20X10 - 1000X32

Tools for machining very hard metals, Ni, Co, and Ti based alloys, broaches, cutters, twist drills, taps, cutting tools and cold work punches.