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

JIS G3445 STKM 13B Carbon Steel Tubes Quick Details

Company Name: Beite steel pipe

Country/Region: China

Material：STKM 13B

FOB Price: US $1200-2200 / Ton | 1 Ton/Tons (Min. Order)

Port of Shipment：Tianjin,China

Payment：L/C or T/T

Delivery: 7-15 days after payment

Package：Standard export package,suit for all kinds of transport, or as required

JIS G3445 STKM 13B Carbon Steel Tubes Dimensional Range & Specification

Outside Diameter：12.7mm——323.8mm

Wall thickness：3.0mm——12.7mm

Length：6000mm、12000m or specified length as required.

Method of Manufacture

The tubes of Grades 13 shall be manufactured by seamless process, electric resistance welding process, or butt welding process,

The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

Chemical Composition of JIS G3445 STKM 13B Carbon steel tubes

Standard	Grade	Chemical Composition
Standard	Grade	C	Si	Mn	P、S
JIS G3445	STKM 13B	≤0.25	≤0.35	≤0.60	≤0.040

Mechanical Properties of JIS G3445 STKM 13B Carbon steel tubes

Standard	Grade	Tenslle Strength(MPa)	Yield Strength(MPa)	Elongation(%)
JIS G3445	STKM 13B	≥440	≥305	≥20

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

Dimensional Tolerances

The tolerances on outside diameter and wall thickness for JIS G3445 STKM 13B Carbon steel tubes

Tolerances 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%

Remarks

1.For hot finished seamless steel tube, the outside diameter tolerances No. 1 shall be applied.

2.The tolerances on outside diameter of quenched and tempered tubes shall be as agreed upon by the purchaser and the manufacturer.

Tolerances on Wall Thickness

Division	Tolerances on wall thickness
No. 1	Under 4mm +0.6mm -0.5mm
No. 1	4mm or over +15% -12.5%
No. 2	Under 3mm 【0.3mm】
No. 2	3mm or over 【10%】
No. 3	Under 2mm 【0.15mm】
No. 3	2mm or over 【8%】

Remarks

For hot finished seamless steel tubes the tolerances NO. 1 shall be applied

Test

Chemical Analysis

Tensile Test

Bending Test

Flattening Test

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.

Factory Photo