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Cold rolled cylinder din2391 ST52 precision seamless steel tube
Mar 11, 2017

Specifiation of carbon tube: 


DIN2391, DIN2445, EN10305, GB/T 3639, GB 8713


ST35(E235), ST37, ST24(E255), ST52(E355), 10#, 20#, 35#, 45#





Surface Treatment

bare, varnished,oiled, anti-corrosion coating as request


1. bundle packing

2. marking as per customer's requests

3. paint on the pipe as per customer request

4. pipe caps as customer request

Condirion of Delivery

1. NBK(+N)

after cold forming, eventually above phase transition point, in a protective atmosphere of annealing oxidation medium

2. GBK(+A)

after cold forming, annealing in non oxidizing medium protective gas

3. BK(+C)

the final heat treatment after cold forming, threfore small steel pipe plasticly, the plasticly degree does not guarantee

4. BKW(+LC)

after final heat treatment, a tiny cold drawing deformation, continue again when machining steel pipe allowed inside certain limits cold deformation(bending, flaring)

5. BKS(+SR)

have a stress relief after cold forming, heat treatment, steel pipe can be carried out within a certain limit in the appropriate processing again