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Zhangjiagang Huadian Import & Export Co., Ltd.
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Cold finished carbon steel mechanical tubing|tube|tubes
Hi,this is maria,thanks very much for your interesting to our products,If you want such steel tubes and pipes,or the standard is not listed above,pls do not hesitate to contact me at once.pls tell me,it's my honor to service you!
Tel:+86-18921988727
Zhangjiagang Huadian Import & Export Co., Ltd is a company based in China, we have two factories, one factory manufactures steel tubes and the other factory produces power station equipment.
Jiangsu Dehai Group (Parent Company) | |
Zhangjiagang Huadian Im &Ex Co., Ltd (Subsidiary) | |
Zhangjiagang Huagang IndustrialCo.,Ltd (Factory)
| Specializes in the production of cold-drawn/cold-rolled precision seamless steel tubes,such as bright oil tubes etc. |
Zhangjiagang Huadian Power Equipment Co.,Ltd (Factory) | A manufacturer of power station boiler, industrial boiler, waste heat boiler, refusefired boiler, biomass boiler and the correlated pressure parts integrating the design, manufacture, installation, repair and maintance |
Including seamless precision tubes in our product range manufactured to DIN 2391.
These tubes are supplied in a seamless cold drawn and normal annealed quality, marked by the code NBK.
The tubes can be delivered in either oiled finish or passivated finish.
The tubes are manufactured from St37.4 carbon steel with a fine quality according to DIN2391 and have the following material properties.
| Material | Tensile Strength Rm inN/mm2 | Yield Strength in N/mm2 | Elongation in % |
| ST37.4 | 350-480 | 235 for wall thickness less than or equal to 16mm | 25 |
Each tube is subjected to a non destructive material testing to detect faults and improperties.
Tubes are in fixed lengths of 6 metres and can be marked over the entire length according to DIN 2391.
This designation also serves as proof that the above mentioned tests have been carried out and replaces a test report according to EN10204.If required, customers can be supplied with an inspection certificate 3.1B according to EN10204.
| Brand | Chemical Composition(%) | ||||
| C max | Si max | Mn | P max | S max | |
| St 35 | 0.17 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St 45 | 0.21 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St 52 | 0.22 | 0.55 | ≤1.60 | 0.025 | 0.025 |
Mechanical Properties(Mpa)
| Steel grade | BKW | BK | BKS | GBK | NBK | |||||||
Tensile Streng th ReH N/mm min | Elon gati on % min | Tensile Streng th ReH N/mm min | Elon gati on % min | Tensile Streng th ReH N/mm min | Yield streng th Rm N/mm min | Elon gati on % min | Tensile Streng th ReH N/mm min | Elon gati on % min | Tensile Streng th ReH N/mm min | Yield streng th Rm
N/mm min | Elon gati on % min | |
| St35 | 480 | 6 | 420 | 10 | 420 | 315 | 14 | 315 | 25 | 340-470 | 235 | 25 |
| St45 | 580 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440-570 | 255 | 21 |
| St52 | 640 | 4 | 580 | 7 | 580 | 420 | 10 | 490 | 22 | 490-630 | 355 | |