Professional China DIN 2391 St35 SAE4140 SAE4340 SAE4145h High Precision Cold Rolled Seamless Steel Carbon Steel Pipe Honed Tube Round Steel Pipe
Short Description:
We pursue the administration tenet of “Quality is superior, Services is supreme, Standing is first”, and will sincerely create and share success with all customers for Professional China DIN 2391 St35 SAE4140 SAE4340 SAE4145h High Precision Cold Rolled Seamless Steel Carbon Steel Pipe Honed Tube Round Steel Pipe, Our intention is to assist clients understand their ambitions. We are earning wonderful attempts to realize this win-win predicament and sincerely welcome you to be a part of us.
We pursue the administration tenet of “Quality is superior, Services is supreme, Standing is first”, and will sincerely create and share success with all customers for Carbon Steel Pipe and Carbon Steel Tube, Meanwhile, we’re building up and consummating triangle market & strategic cooperation in order to achieve a multi-win trade supply chain to expand our market vertically and horizontally for a brighter prospects. development. Our philosophy is to create cost-effective products and solutions, promote perfect services, cooperate for long-term and mutual benefits, firm a in depth mode of excellent suppliers system and marketing agents, brand strategic cooperation sales system.
|
Standard |
Grade |
Chemical Components (%) |
|||||||
|
|
|
C (Max) |
Si(Max) |
Mn |
P |
S |
Mo |
Cr |
V |
|
DIN2391 |
ST52 |
0.22 |
0.55 |
≤1.60 |
≤0.025 |
≤0.025 |
0.90-1.20 |
/ |
/ |
|
Standard |
Grade |
Mechanical Properties（NBK) |
||
|
Tensile |
Yield |
Elonga-tion |
||
|
DIN2391 |
ST52 |
490-630 |
≥355 |
≥22 |
Annealing
After the goods are cold drawn to sizes, the tubes are put on annealing furnace for heat treatment and normalising.
Straightening
Post annealing, the goods are passed through a seven roller straightening machine to achieve proper straightening of the tubes.
Eddy current
Post straightening, each tube is passed through eddy current machine to detect for surface cracks and other defects . Only the tubes that pass eddy current are fit for delivery to customers.
Finishing
Each tube is either oiled with corrosion resistant oil or varnished for surface protection and corrosion resistant as per customers requirement, each tube end is covered by plastic end caps to avoid damage in transit, the marking and specs are put and the goods are ready for dispatch.
|
Designation |
Symbol |
Description |
|
Cold drawn/hard |
+C |
No heat treatment after the final cold drawing process |
|
Cold drawn/soft |
+LC |
After the final heat treatment there is a suitable drawing pass |
|
Cold drawn and stress relieved |
+SR |
After the final cold drawing process there is a stress relief heat treatment in a controlled atmosphere |
|
Annealed |
+A |
After the final cold drawing process the tubes are annealed in a controlled atmosphere |
|
Normalized |
+N |
After the final cold drawing operation the tubes are normalized in a controlled atmosphere |
Cold Drawn Carbon steel seamless pipes are extensively applied in the nuclear device, gas conveyance, petrochemical, shipbuilding and boiler industries, with characteristics of high corrosion resistance combined with suitable mechanical properties.
- Nuclear device
- Gas conveyance
- Petrochemical industries
- Shipbuilding and boiler industries
We pursue the administration tenet of “Quality is superior, Services is supreme, Standing is first”, and will sincerely create and share success with all customers for Professional China DIN 2391 St35 SAE4140 SAE4340 SAE4145h High Precision Cold Rolled Seamless Steel Carbon Steel Pipe Honed Tube Round Steel Pipe, Our intention is to assist clients understand their ambitions. We are earning wonderful attempts to realize this win-win predicament and sincerely welcome you to be a part of us.
Professional China Carbon Steel Pipe and Carbon Steel Tube, Meanwhile, we’re building up and consummating triangle market & strategic cooperation in order to achieve a multi-win trade supply chain to expand our market vertically and horizontally for a brighter prospects. development. Our philosophy is to create cost-effective products and solutions, promote perfect services, cooperate for long-term and mutual benefits, firm a in depth mode of excellent suppliers system and marketing agents, brand strategic cooperation sales system.
