JIS G3445 STKM 13B Machine Structural Tubes

JIS G3445 STKM13B

Carbon Steel Tubes for Machine Structural Purpose

JIS G3445 STKM13A, STKM 13B, STKM 13C is the standard

applicable to carbon steel tubes for machine structural purposes

STKM 13B Cold Drawn Seamless Tubes Tag

JIS G3445 STKM 13B (STKM 13A, STKM 13C) Carbon Steel Tubes for Machine Structural Purposes

Quick Details:

Company Name: CTS TUBES

Country/Region: China

Material: STKM 13B, STKM 13A, STKM 13C

Port of Shipment: Shanghai Port China

Payment term: L/C or T/T

Delivery date: 7-15days after advance payment

Application

JIS G3445 STKM 13A, STKM 13B, STKM 13C 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 the distinction of manufacturing the tube, cold working process, heat treatment, etc.

Grade		Designation
Grade 13	A	STKM 13A
	B	STKM 13B
	C	STKM 13C

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Method of Manufacture:

The tubes of STKM 13B shall be manufactured by seamless process, electric resistance welding process, or butt-welding process.

STKM 13B tubes shall be manufactured or in cold-finished condition or subjected to appropriate heat treatment.

World standard Comparative with JIS G3445 STKM 13

NUBER	GRADE		NUBER	GRADE	NUBER	GRADE	NUBER	GRADE
13	Grade 13A	STKM 13A	A512	MT 1025	13	STKM 13A	–	–
			A513	MTX 1025
			A519	MT 1025
	Grade 13B	STKM 13B	–	–	13	STKM 13B	980	CDS-4
	Grade 13C	STKM 13C	–	–	13	STKM 13C	–	–

STKM 13(A, B, C) Chemical Composition

Grade		Designation	Unit %
			C	Si	Mn	P	S	Nb or V
Grade 13	A	STKM 13A	0.25 max.	0.35 max.	0.30~0.90	0.040 max.	0.040 max.	–
	B	STKM 13B
	C	STKM 13C

Click to download the details of JIS G3445 STKM13B Tubes.

STKM 13(A, B, C) Mechanical Properties

Designation	Tensile 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 angle	Inside radius
			No. 11	No. 5			(D is outside dia. of the tube)
			No. 12	test pieces Transverse direction
			test pieces Longitudinal direction
STKM13A	370{38} min.	215{22} min.	30 min.	25 min.	2/3 D	90	6 D
STKM13B	440{45} min.	305{31} min.	20 min.	15 min.	3/4 D	90	6 D
STKM13C	510{52} min.	380{39} min.	15 min.	10 min.	–	–	–

Appearance

The STKM 13B tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube
The STKM 13B tubes shall be free from defects detrimental to practical use.
The surface finish of the STKM 13B tubes, when especially specified, shall be agreed upon by the purchaser and the manufacturer.

Tolerance on Outside Diameter

Division	Tolerance on the outside diameter
No. 1	Under 50mm ±0.5mm
No. 1	50mm or over ±1%
No. 2	Under 50mm ±0.25mm
No. 2	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 on 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
	±10%

Standard: JIS G3445

Description Name: STKM 13A steel tubes, STKM 13B steel tubes, STKM 13C steel tubes, JIS G3445 STKM 13B Steel pipes.

Size: 4mm-340mm

W.T.: 1mm-50mm

Shape: Round

Production type: Cold drawn, Cold rolled, Hot rolled, or Electric resistance welding.

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

Grade: STKM 13A, STKM 13B, STKM 13C

Marking

Each STKM 13B tube having passed the inspection shall be legibly marked with the following items, the order of arranging the articles 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.
(1) Designation of grade
(2) Letter symbol indicating the manufacturing process

Note:

Mill test certificates will be issued according to EN10204.3.1
The tubes Shall be Seamless or Welded.

Protection and Packing:

Packed in a wooden box or bundles protected with plastic paper and suitably protected for sea-worthily delivery or as requested.
The tubes shall be delivered with temporary corrosion protection. The type of protection shall be at the discretion of the manufacturer.