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Cold Rolled Steel Pipe BK BKS Cold Rolled Steel Tube

Name:Cold Rolled Steel Pipe BK BKS Cold Rolled Tube

Standard: EN1030-4 DIN2391 DIN1630 DIN2445 JIS G3445 SAE J524

Type: Cold rolled/cold drawn

Grade: 4140 4130 S45C STKM11A STKM12B E355/ST52 ST35/E235 ST37.4 ST45/E255etc

Size:  OD 4mm-219mm WT0.5mm-25mm

Condition: BK/BKS/NBK/GBK etc.

Mill Test Certificate:  EN10204 3.1

Processing: Bending/ Cutting/Flattening/Flaring

Product Detail

Product Tags

New Gapower Metal is professional manufacturer of hydraulic steel pipe.With an annual production of 10,000 tons of high precision seamless steel tube.

Sample characteristic Introduction


Cold Rolled Steel Pipe BK BKS Cold Rolled Tube is a kind of high-precision steel pipe material after cold rolled treatment. Precision steel pipes have high dimensional accuracy, high internal and external surface finish. After heat treatment, the internal and external surfaces of the steel pipes are free of oxide film. The steel pipes are flared and flattened without cracks, cold bending without deformation, and can withstand high pressure, and can perform various complex deformation and mechanical deep processing.

Cold Rolled Steel Pipe BK BKS Cold Rolled Tube inner and outer diameter tolerance can be accurate to ±0.1mm, in order to ensure the same bending and torsional strength, light weight, so widely used in manufacturing precision machinery parts. Precision steel pipe can save the waste of raw materials, improve the efficiency of mechanical processing, reduce processing procedures, improve production and material utilization rate, and help to improve product quality, reduce costs, and improve economic.


1.The inner and outer walls of precision steel pipes have no oxide layer;
2.No leakage under high pressure;
3.High precision;
4.High finish with smooth surface
5.No deformation during cold bending, flaring, flattening and no cracks.

Mechanical properties

Condition Materail Grade T.S (MPa) Y.S (MPa) Elongation(%)
BKS ST35 (10#) ≥420 ≥315 ≥14
BKS ST45(20#) ≥520 ≥375 ≥12
BKS ST52(16Mn) ≥580 ≥420 ≥10
GBK ST35 (10#) ≥315   ≥35
GBK ST45(20#) ≥390   ≥32
GBK ST52(16Mn) ≥490   ≥30
NBK ST35 (10#) 340-470 ≥235 ≥32
NBK ST45(20#) 440-570 ≥255 ≥30
NBK ST52(16Mn) 490-630 ≥335 ≥28

Quality assurance

1.Strict according to DIN2391/EN10305 or other standards.

2. Sample: Sample is free for test.

3. Tests: Salt spray test/Tensile test / Eddy current / Chemical composition test according to customers' request

4.Certificate: IATF16949, ISO9001, SGS etc.

5.EN 10204 3.1 Certification

Product package


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