MATERIALS USED FOR THREAD CUTTING TOOLS

Classification

Symbols

Chemical Composition

C

Si

Mn

P

S

Cr

Mo

W

V

Co

W typeHSS

SKH2

0.73~0.83

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

─

17.00~19.00

0.80~1.20

─

SKH3

0.73~0.83

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

─

17.00~19.00

0.80~1.20

4.50~5.50

SKH4

0.73~0.83

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

─

17.00~19.00

1.00~1.50

9.00~11.00

SKH10

1.45~1.60

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

─

11.50~13.50

4.20~5.20

4.20~5.20

Mo typeHSS

SKH51

0.80~0.90

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

4.50~5.50

5.50~6.70

1.60~2.20

─

SKH52

1.00~1.10

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

4.80~6.20

5.50~6.70

2.30~2.80

─

SKH55

0.85~0.95

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

4.60~5.30

5.70~6.70

1.70~2.20

4.50~5.50

SKH56

0.85~0.95

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

4.60~5.30

5.70~6.70

1.70~2.20

7.00~9.00

SKH58

0.95~1.05

≦0.5

≦0.4

≦0.030

≦0.030

3.50~4.50

8.20~9.20

1.50~2.10

1.70~2.20

─

SKH59

1.00~1.15

≦0.5

≦0.4

≦0.030

≦0.030

3.50~4.50

9.00~10.00

1.20~1.90

0.90~1.40

7.50~8.50

V typeHSS

SKH53

1.10~1.25

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

4.60~5.30

5.70~6.70

2.80~3.30

─

SKH54

1.25~1.40

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

4.50~5.50

5.30~6.50

3.90~4.50

─

SKH57

1.20~1.35

≦0.4

≦0.4

≦0.030

≦0.030

3.80~4.50

3.00~4.00

9.00~11.00

3.00~3.70

9.00~11.00

Classification

Symbols

Usage

Cross chart

AISI

VDEH

ISO

W typeHSS

SKH2

Tools for general cutting and other kinds of tools.

T1

S18-0-1

S1 (HS18-0-1)

SKH3

Tools for high speed heavy cutting and other kinds of tools.

T4

S18-1-2-5

S7(HS18-1-1-5)

SKH4

Tools for cutting hard-to-machine materials and other kinds of tools.

T5

S18-1-2-10

S6(HS18-0-1-10)

SKH10

Tools for cutting ultra hard-to-machine materials and other kinds of tools.

T15

─

S9 (HS12-1-5-5)

Mo & V type HSS

SKH51

 General cutting tools from which toughness is particularly required and other kinds of tools.

M2

S6-5-2

S4 (HS6-5-2)

SKH52

M3-1

─

─

SKH53

Tools for cutting high hardness material from which comparatively high toughness is required and other kinds of tools.

M3-2

S6-5-3

S5 (HS6-5-3)

SKH54

M4

─

─

SKH55

M35

S6-5-2-5

S8 (HS6-5-2-5)

SKH56

High speed cutting tools from which comparatively high toughness is required and other kinds of tools.

M36

─

─

SKH57

─

S10-4-3-10

S10 (HS10-4-3-10)

SKH58

General cutting tools from which toughness is particularly required and other kinds of tools.

M7

S2-9-2

S2 (HS2-9-2)

SKH59

High speed heavy cutting tools from which comparatively high toughness is required and other kinds of tools.

M42

S2-10-1-8

S11(HS2-9-1-8)