Jiangsu Hongbao Group Co., Ltd.
Jiangsu Hongbao Group Co., Ltd. Manufacture since 1958
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Round Steel Pipe DIN2391 DIN2445 St37.4 High Precision Seamless Steel Tubes
Chemical Component
C: ≤0.17%;
Si: ≤0.35%;
Mn: ≤1.2%;
S: ≤0.025%;
P: ≤0.025%;
Mechanical properties:
Tensile strength: 340-480mpa;
Yield strength: ≥235Mpa;
Elongation: ＞25%;
Main Date
| Standard | DIN2391,DIN2445 |
| Material | St37.4 |
| Outer Diameter Range: | 4-120mm |
| Wall Thickness Range: | 0.5-15mm |
NBK(+N): After the final cold drawing operation the tubes are normalized in a controlled atmosphere.
GBK(+A): After the final cold drawing process the tubes are annealed in a controlled atmosphere.
BK(+C): No heat treatment after the final cold drawig process.
BKW(+LC): After the final heat treatment there is a suitable drawing pass.
BKS(+SR): After the final cold drawing process there is a stress relieve heat treatment in a controlled atmosphere.
Surface treatment:
Oil-dip;
Varnish;
Shot Blasting;
As customer's requirements.
lab:
We have our own lab to control the material and the product meet the international standard.
