Standard

JIS G3441

This Japanese Industrial Standard specifies the alloy steel tubes, hereinfter referred to as the"tubes", used for machinery, automobiles and other machine parts.


Application: Pipe ordered under this specification for machinery, automobiles and other machine parts.

Manufacturing Process: By a seamless process: hot finished and cold finished (with annealed)

Manufacture: seamless pipe (hot finished and cold finished)

Size: O.D.: 15.0~114mm W.T.: 2~20mm

Grade: Class1, Class2, Class3

Length: 6M or specified length as required.

Ends: Plain End, Beveled End.


Tolerance of OD and W.T

Division

Tolerance on O.D

Tolerance on W.T

Class 1

D<50m

±0.5 mm

S<4mm

+0.6mm-0.5mm

50mm≤D

±1%

S≥4mm

+1% -12.5%

Class 2

D<50m

±0.25mm

S<3mm

±0.3mm

50mm≤D

±0.5%

S≥3mm

±10%

Class 3

D<25m

±0.12mm

S<2mm

±0.15mm

40mm>D≥25mm

±0.15mm



50mm>D≥40mm

±0.18mm

S≥2mm

±8%

60mm>D≥50mm

±0.20mm

Notes: tolerance on each wall thickness shall be rounded off to one decimal place in accordance with rule a JIS Z 8401

70mm>D≥60mm

±0.23mm

80mm>D≥70mm

±0.25mm

90mm>D≥80mm

±0.30mm

100mm>D≥90mm

±0.40mm

D≥100mm

±0.50%






1. The OD tolerance of hot finish seamless steel pipe according to Class1 2. Quenched and tempered steel pipes according to 4 categories.


Grade and Chemical Composition (%)

Designation of grade

C

Si

Mn

P

s

Ni

Cr

Mo

Cu

SMn420TK

0.17 to 0.23

0.15 to 0.35

1.20 to 1.50

0.030 max.

0.030 max.

0.25 max.

0.35 max.

/

0.30 max.

SMn433TK

0.30 to 0.36

0.15 to 0.35

1.20 to 1.50

0.030 max.

0.030 max.

0.25 max.

0.35 max.

/

0.30 max.

SMn438TK

0.35 to 0.41

0.15 to 0.35

1.35 to 1.65

0.030 max.

0.030 max.

0.25 max.

0.35 max.

/

0.30 max.

SMn443TK

0.40 to 0.46

0.15 to 0.35

1.35 to 1.65

0.030 max.

0.030 max.

0.25 max.

0.35 max.

/

0.30 max.

SMnC420TK

0.17 to 0.23

0.15 to 0.35

1.20 to 1.50

0.030 max.

0.030 max.

0.25 max.

0.35 to 0.70

/

0.30 max.

SMnC443TK

0.40 to 0.46

0.15 to 0.35

1.35 to 1.65

0.030 max.

0.030 max.

0.25 max.

0.35 to 0.70

/

0.30 max.

SCM15TK

0.13 to 0.18

0.15 to 0.35

0.60 to 0.90

0.030 max.

0.030 max.

0.25 max.

0.90 to 1.20

/

0.30 max.

SCM20TK

0.18 to 0.23

0.15 to 0.35

0.60 to 0.90

0.030 max.

0.030 max.

0.25 max.

0.90 to 1.20

/

0.30 max.

SCr430TK

0.28 to 0.33

0.15 to 0.35

0.60 to 0.90

0.030 max.

0.030 max.

0.25 max.

0.90 to 1.20

/

0.30 max.

SCr435TK

0.33 to 0.38

0.15 to 0.35

0.60 to 0.90

0.030 max.

0.030 max.

0.25 max.

0.90 to 1.20

/

0.30 max.

SCM40TK

0.38 to 0.43

0.15 to 0.35

0.60 to 0.90

0.030 max.

0.030 max.

0.25 max.

0.90 to 1.20

/

0.30 max.

SCM45TK

0.43 to 0.48

0.15 to 0.35

0.60 to 0.90

0.030 max.

0.030 max.

0.25 max.

0.90 to 1.20

/

0.30 max.

SCM415TK

0.13 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.18

0.35

0.90

max.

max.

max.

1.20

0.25

max.

SCM418TK

0.16 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.21

0.35

0.90

max.

max.

max.

1.20

0.25

max.

SCM420TK

0.18 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.23

0.35

0.90

max.

max.

max.

1.20

0.25

max.

SCM421TK

0.17 to

0.15 to

0.70 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.23

0.35

1.00

max.

max.

max.

1.20

0.25

max.

SCM425TK

0.23 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.28

0.35

0.90

max.

max.

max.

1.20

0.30

max.

SCM430TK

0.28 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.33

0.35

0.90

max.

max.

max.

1.20

0.30

max.

SCM432TK

0.27 to

0.15 to

0.30 to

0.030

0.030

0.25

1.00 to

0.15 to

0.30


0.37

0.35

0.60

max.

max.

max.

1.50

0.30

max.

SCM435TK

0.33 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.38

0.35

0.90

max.

max.

max.

1.20

0.30

max.

SCM440TK

0.38 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.43

0.35

0.90

max.

max.

max.

1.20

0.30

max.

SCM445TK

0.43 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.15 to

0.30


0.48

0.35

0.90

max.

max.

max.

1.20

0.35

max.

SCM822TK

0.20 to

0.15 to

0.60 to

0.030

0.030

0.25

0.90 to

0.35 to

0.30


0.25

0.35

0.90

max.

max.

max.

1.20

0.45

max.

SNC236TK

0.32 to 0.40

0.15 to 0.35

0.50 to 0.80

0.030 max.

0.030 max.

1.00 to 1.50

0.50 to 0.90

/

0.30 max.

SNC415TK

0.12 to 0.18

0.15 to 0.35

0.35 to 0.65

0.030 max.

0.030 max.

2.00 to 2.50

0.20 to 0.50

/

0.30 max.

SNC631TK

0.27 to

0.15 to

0.35 to

0.030 max.

0.030 max.

2.50 to

0.60 to

/

0.30 max.

0.35

0.35

0.65

3

1

SNC815TK

0.12 to

0.15 to

0.35 to

0.030 max.

0.030 max.

3.00 to

0.60 to

/

0.30 max.

0.18

0.35

0.65

3.5

1

SNC836TK

0.32 to

0.15 to

0.35 to

0.030 max.

0.030 max.

3.00 to

0.60 to

/

0.30 max.

0.4

0.35

0.65

3.5

1

SNCM220TK

0.17 to

0.15 to

0.60 to

0.030 max.

0.030 max.

0.40 to

0.40 to

0.15 to

0.30 max.

0.23

0.35

0.9

0.7

0.6

0.25

SNCM240TK

0.38 to

0.15 to

0.70 to

0.030 max.

0.030 max.

0.40 to

0.40 to

0.15 to

0.30 max.

0.43

0.35

1

0.7

0.6

0.3

SNCM415TK

0.12 to

0.15 to

0.40 to

0.030 max.

0.030 max.

1.60 to

0.40 to

0.15 to

0.30 max.

0.18

0.35

0.7

2

0.6

0.3

SNCM420TK

0.17 to

0.15 to

0.40 to

0.030 max.

0.030 max.

1.60 to

0.40 to

0.15 to

0.30 max.

0.23

0.35

0.7

2

0.6

0.3

SNCM431TK

0.27 to

0.15 to

0.60 to

0.030 max.

0.030 max.

1.60 to

0.60 to

0.15 to

0.30 max.

0.35

0.35

0.9

2

1

0.3

SNCM439TK

0.36 to

0.15 to

0.60 to

0.030 max.

0.030 max.

1.60 to

0.60 to

0.15 to

0.30 max.

0.43

0.35

0.9

2

1

0.3

SNCM447TK

0.44 to

0.15 to

0.60 to

0.030 max.

0.030 max.

1.60 to

0.60 to

0.15 to

0.30 max.

0.5

0.35

0.9

2

1

0.3

SNCM616TK

0.13 to

0.15 to

0.80 to

0.030 max.

0.030 max.

2.80 to

1.40 to

0.40 to

0.30 max.

0.2

0.35

1.2

3.2

1.8

0.6

SNCM625TK

0.20 to

0.15 to

0.35 to

0.030 max.

0.030 max.

3.00 to

1.00 to

0.15 to

0.30 max.

0.3

0.35

0.6

3.5

1.5

0.3

SNCM630TK

0.25 to

0.15 to

0.35 to

0.030 max.

0.030 max.

2.50 to

2.50 to

0.50 to

0.30 max.

0.35

0.35

0.6

3.5

3.5

0.70 b)

SNCM815TK

0.12 to

0.15 to

0.30 to

0.030 max.

0.030 max.

4.00 to

0.70 to

0.15 to

0.30 max.

0.18

0.35

0.6

4.5

1

0.3

SACM645TK

0.40 to

0.15 to

0.60 max.

0.030 inax.

0.030 max.

0.25 max.

1.30 to

0.15 to

0.30 max.

0.5

0.5

1.7

0.3

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