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JIS G3445 STKM11A, STKM 12A, STKM 12C, STKM 13A

Carbon steel tubes for machine structural purposes

JIS G3445 STKM11A, STKM 12A, STKM 12C, STKM13A is the standard applicable to carbon steel tubes for machine structural purposes

STKM 11A Seamless Tubes

Application

JIS G3445 STKM 11A, STKM 12A, STKM 12C, STKM 13A, STKM 13C, STKM 15A, STKM 15C, STKM 17A, STKM 17C carbon steel tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.

Grade and Designation

The grade and designation of the tube shall be as given as follows table.

The sub classification letter symbols A, B and C are used to indicate distinction of method of manufacturing the tube, cold working process, heat treatment, etc.

GradeDesignation
Grade 11ASTKM 11A
Grade 12ASTKM 12A
BSTKM 12B
CSTKM 12C
Grade 13ASTKM 13A
BSTKM 13B
CSTKM 13C
Grade 14ASTKM 14A
BSTKM 14B
CSTKM 14C
Grade 15ASTKM 15A
CSTKM 15C
Grade 16ASTKM 16A
CSTKM 16C
Grade 17ASTKM 17A
CSTKM 17C
Grade 18ASTKM 18A
BSTKM 18B
CSTKM 18C
Grade 19ASTKM 19A
CSTKM 19C
Grade 20ASTKM 20A

Click to download the MTC of JIS G3445 STKM 11A.

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Click to download the details of JIS G3445 STKM 11A.

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World standard Comparative with JIS G3445

NUBERGRADENUBERGRADENUBERGRADENUBERGRADE
D 3517Grade 11 ASTKM 11 AA513MT1010G-3445STKM11A
A519MT1010
Grade 12ASTKM 12 AA513MT1015STKM12A980CDS-3
A519MT1015
Grade 12 BSTKM 12 BSTKM12B
Grade 12CSTKM 12CA512MT1015STKM12C
A513
Grade 13 ASTKM 13 AA512MT  1025STKM13A
A513MTX1025
A519 MT  1025
Grade13BSTKM 13 BSTKM13B980CDS-4
Grade13 CSTKM 13 CSTKM13C
Grade14 ASTKM 14 AA513MT1030STKM14A1717CDS-103
A519MT1030
Grade14 BSTKM 14 BSTKM14B
Grade14 CSTKM 14 CSTKM14C
Grade15 ASTKM 15 AA513MT1033STKM15A1717CDS-105
Grade15 CSTKM 15 CSTKM15C
Grade16 ASTKM 16 AA519MT1040STKM16A980CDS-5
Grade16 CSTKM 16 CSTKM16C
Grade17 ASTKM 17 AA519MT1050STKM17A980CDS-7
1717CDS-107
Grade17 CSTKM 17 CSTKM17B
Grade18 ASTKM 18 AA519MT1524STKM18A980CDS-9
Grade18 BSTKM 18 BSTKM18B
Grade18 CSTKM 18 CSTKM18C
Grade19 ASTKM 19 A
Grade19 CSTKM 19 C
Grade20 ASTKM 20 A

Chemical Composition

GradeDesignationUnit %
CSiMnPSNb or V
Grade 11ASTKM 11A0.12 max.0.35 max.0.60 max.0.040 max.0.040 max.
Grade 12ASTKM 12A0.20 max.0.35 max.0.60 max.0.040 max.0.040 max.
BSTKM 12B
CSTKM 12C
Grade 13ASTKM 13A0.25 max.0.35 max.0.30~0.900.040 max.0.040 max.
BSTKM 13B
CSTKM 13C
Grade 14ASTKM 14A0.30 max.0.35 max.0.30~1.000.040 max.0.040 max.
BSTKM 14B
CSTKM 14C
Grade 15ASTKM 15A0.25~0.350.35 max.0.30~1.000.040 max.0.040 max.
CSTKM 15C
Grade 16ASTKM 16A0.35~0.450.40 max.0.40~1.000.040 max.0.040 max.
CSTKM 16C
Grade 17ASTKM 17A0.45~0.550.40 max.0.40~1.000.040 max.0.040 max.
CSTKM 17C
Grade 18ASTKM 18A0.18 max.0.55 max.1.50 max.0.040 max.0.040 max.
BSTKM 18B
CSTKM 18C
Grade 19ASTKM 19A0.25 max.0.55 max.1.50 max.0.040 max.0.040 max.
CSTKM 19C
Grade 20ASTKM 20A0.25 max.0.55 max.1.60 max.0.040 max.0.040 max.0.15 max.

 

Mechanical Properties

DesignationTensile Strength

MPa{ksi}

Yield
point or proof
MPa{ksi}
Elongation %Flattening strength
Distance between flat plates (H)
(D is outside dia. of the tube)
Bending strength
No. 4,No. 4,Bend angleInside radius
No. 11No. 5(D is outside dia. of the tube)
No. 12test pieces Transverse direction
test pieces Longitudinal direction
STKM11A290{30} min.35 min.30 min.1/2 D1804 D
STKM12A340{35} min.175{18} min.35 min.30 min.2/3 D906 D
STKM12B390{40} min.275{28} min.25 min.20 min.2/3 D906 D
STKM12C470{48} min.355{36} min.20 min.15 min.
STKM13A370{38} min.215{22} min.30 min.25 min.2/3 D906 D
STKM13B440{45} min.305{31} min.20 min.15 min.3/4 D906 D
STKM13C510{52} min.380{39} min.15 min.10 min.
STKM14A410{42} min.245{25} min.25 min.20 min.3/4 D906 D
STKM14B500{51} min.355{36} min.15 min.10 min.7/8 D908 D
STKM14C550{56} min.410{42} min.15 min.10 min.
STKM15A470{48} min.275{28} min.22 min.17 min.3/4 D906 D
STKM15C580{59} min.430{44} min.12 min.7 min.
STKM16A510{52} min.325{33} min.20 min.15 min.7/8 D908 D
STKM16C620{63} min.460{47} min.12 min.7 min.
STKM17A550{56} min.345{35} min.20 min.15 min.7/8 D908 D
STKM17C650{66} min.480{49} min.10 min.5 min.
STKM18A440{45} min.275{28} min.25 min.20 min.7/8 D906 D
STKM18B490{50} min.315{32}min.23 min.18 min.7/8 D908 D
STKM18C510{52} min.380{39} min.15 min.10 min.
STKM19A490{50} min.315{32} min.23 min.18 min.7/8 D906 D
STKM19C550{56} min.410{42} min.15 min.10 min.
STKM20A540{55} min.390{40} min.23 min.18 min.7/8 D906 D

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.

Tolerance on Outside Diameter

DivisionTolerances on outside diameter
No. 1Under 50mm ±0.5mm
50mm or over ±1%
No. 2Under 50mm ±0.25mm
50mm or over ±0.5%
No. 3Under 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

DivisionTolerances on wall thickness
No. 1Under 4mm
+0.6mm
-0.5mm
4mm or over
15%
-12.50%
No. 2Under 3mm
±0.3mm
3mm or over

Standard: JIS G3445.

Description Name: STKM 11A Steel tube, STKM 12A steel tubes, STKM 12C steel tubes, STKM 13A steel tubes, STKM 13C steel tubes.

Size: 6mm-340mm.

W.T.: 1mm-50mm.

Shape: Round.

Production type: Cold drawn, cold rolled or hot rolled.

Length: Single random length/ Double random length or as customer’s actual request max length is 10m.

Grade: STKM 11A, STKM 12A, STKM 12C, STKM 12B, STKM 13A, STKM 13B, STKM 13C, STKM 15A, STKM 17A.

Marking

Each tube having passed the inspection shall be legibly marked with the following items, the order of arranging the items is not specified.

However, for smaller tubes or on a request from the purchaser, tubes may be bundled together and marked for each bundle by suitable means.

  • Designation of grade
  • Letter symbol indicating the manufacturing process

Note:

Mill test certificates will be issued according to EN10204.3

The tubes Shall be Seamless or Welded.

 

Protection and Packing:

Packed in wooden box or bundles protected with plastic paper, and suitably protected for sea-worthily delivery or as requested.

The tubes shall be delivered with a temporary corrosion protection. The type of protection shall be at the discretion of the manufacturer.

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JIS G3445 STKM 11A Steel Pipes

JIS G3445 STKM 11A Steel Pipes

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Tel.: +86 185 5109 0083 | E-mail: cts@ctstubes.com

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