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 JIS G3445

Date:2022-03-31View:457Tags:seamless pipe, carbon pipe,stainless pipe,octg pipe manufacturers

Size (mm):

Outer Dimensions: 19.05mm - 114.3mm

Wall Thickness:2.0mm - 14 mm

Length: max 16000mm

Application: Tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.

The main products of steel / steel grade:

STKM11A, STKM12(A,B,C)

STKM13(A,B,C)

STKM14(A,B,C)

Tolerance on Outside Diameter

Division

Tolerances on outside diameter

No. 1

Under 50mm ±0.5mm

50mm or over ±1%

No. 2

Under 50mm ±0.25mm

50mm or over ±0.5%

No. 3

Under 25mm ±0.12mm

25mm or over to and excl. 40mm ±0.15mm

40mm or over to and excl. 50mm ±0.18mm

50mm or over to and excl. 60mm ±0.20mm

60mm or over to and excl. 70mm ±0.23mm

70mm or over to and excl. 80mm ±0.25mm

80mm or over to and excl. 90mm ±0.30mm

90mm or over to and excl.100mm ±0.40mm

100mm or over ±0.50%

Tolerance of Thickness

Division

Tolerances on wall thickness

No. 1

Under 4mm

+0.6mm

-0.5mm

4mm or over

15%

-12.50%

No. 2

Under 3mm

±0.3mm

3mm or over

Chemical Compositions(%):

Grade

C

Si

Mn

P

S

STKM11A

≤0.12

≤0.35

≤0.60

≤0.040

≤0.040

STKM12A

≤0.20

≤0.35

≤0.60

≤0.040

≤0.040

STKM12B

≤0.20

≤0.35

≤0.60

≤0.040

≤0.040

STKM12C

≤0.20

≤0.35

≤0.60

≤0.040

≤0.040

STKM13A

≤0.25

≤0.35

0.30-0.90

≤0.040

≤0.040

STKM13B

≤0.25

≤0.35

0.30-0.90

≤0.040

≤0.040

STKM13C

≤0.25

≤0.35

0.30-0.90

≤0.040

≤0.040

STKM14A

≤0.30

≤0.35

0.30-1.00

≤0.040

≤0.040

STKM14B

≤0.30

≤0.35

0.30-1.00

≤0.040

≤0.040

STKM14C

≤0.30

≤0.35

0.30-1.00

≤0.040

≤0.040

Appearance

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube

The tubes shall be free from defects detrimental to practical use.

The surface finish of the tubes, when especially specified shall be agreed upon by the purchaser and the manufacturer.

Mechanical Properties:

Grade

Yield Strength (Mpa)

Tensile Strength (Mpa)

Elongation (%)

STKM11A

\

≥290

≥35

STKM12A

≥175

≥340

≥35

STKM12B

≥275

≥390

≥25

STKM12C

≥355

≥470

≥20

STKM13A

≥215

≥370

≥30

STKM13B

≥305

≥440

≥20

STKM13C

≥380

≥510

≥15

STKM14A

≥245

≥410

≥25

STKM14B

≥355

≥500

≥15

STKM14C

≥410

≥550

≥15

Grade and Designation

Grade

Designation

Grade 11

A

STKM 11A

Grade 12

A

STKM 12A

B

STKM 12B

C

STKM 12C

Grade 13

A

STKM 13A

B

STKM 13B

C

STKM 13C

Grade 14

A

STKM 14A

B

STKM 14B

C

STKM 14C

Grade 15

A

STKM 15A

C

STKM 15C

Grade 16

A

STKM 16A

C

STKM 16C

Grade 17

A

STKM 17A

C

STKM 17C

Grade 18

A

STKM 18A

B

STKM 18B

C

STKM 18C

Grade 19

A

STKM 19A

C

STKM 19C

Grade 20

A

STKM 20A

World standard Comparative 

NUBER

GRADE

NUBER

GRADE

NUBER

GRADE

NUBER

GRADE

D 3517

Grade 11 A

STKM 11 A

A513

MT1010

G-3445

STKM11A

–

–

A519

MT1010

 

Grade 12A

STKM 12 A

A513

MT1015

 

STKM12A

980

CDS-3

A519

MT1015

 

Grade 12 B

STKM 12 B

–

–

 

STKM12B

–

–

 

Grade 12C

STKM 12C

A512

MT1015

 

STKM12C

–

–

A513

 

Grade 13 A

STKM 13 A

A512

MT  1025

 

STKM13A

–

–

A513

MTX1025

A519

 MT  1025

 

Grade13B

STKM 13 B

–

–

 

STKM13B

980

CDS-4

 

Grade13 C

STKM 13 C

–

–

 

STKM13C

–

–

 

Grade14 A

STKM 14 A

A513

MT1030

 

STKM14A

1717

CDS-103

A519

MT1030

 

Grade14 B

STKM 14 B

–

–

 

STKM14B

–

–

 

Grade14 C

STKM 14 C

–

–

 

STKM14C

–

–

 

Grade15 A

STKM 15 A

A513

MT1033

 

STKM15A

1717

CDS-105

 

Grade15 C

STKM 15 C

–

–

 

STKM15C

–

–

 

Grade16 A

STKM 16 A

A519

MT1040

 

STKM16A

980

CDS-5

 

Grade16 C

STKM 16 C

–

–

 

STKM16C

–

–

 

Grade17 A

STKM 17 A

A519

MT1050

 

STKM17A

980

CDS-7

1717

CDS-107

 

Grade17 C

STKM 17 C

–

–

 

STKM17B

–

–

 

Grade18 A

STKM 18 A

A519

MT1524

 

STKM18A

980

CDS-9

 

Grade18 B

STKM 18 B

–

–

 

STKM18B

–

–

 

Grade18 C

STKM 18 C

–

–

 

STKM18C

–

–

 

Grade19 A

STKM 19 A

–

–

 

–

–

–

 

Grade19 C

STKM 19 C

–

–

 

–

–

–

 

Grade20 A

STKM 20 A

–

–

 

–

–

–

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