ASTM standard a53 grade b cold drawn steel tube
1.. BKS(+SR) of honed tube

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

2. GBK(+A) of hydraulic cylinder tube
after cold forming, annealing in non oxidizing medium protective gas

3. BK(+C) of honed tube
the final heat treatment after cold forming, therefore small steel pipe plastically, the plastically degree does not guarantee

4. BKW(+LC) of hydraulic cylinder tube
after final heat treatment, a tiny cold drawing deformation, continue again when machining steel pipe allowed inside certain limits cold deformation(bending, flaring)

1, What is your main products?
Our main products cold drawn tube, cold rolled tube, hydraulic cylinder pipe, SRB honed tube 

2, What is the MOQ?
5Ton

3, How about delivery time?
The time of delivery is about 20 days after we received the deposit.

4, What is the shipping port?
We ship the goods via Qingdao and Yantai

5, What is your payment terms?
We accept 30% TT in advance, 70% balance before shipment.

6.Why do you choose us?
Because we have large stocks and long term cooperative factories, we can get the lowest ex-factory prices.
The price is quite reasonable and it is lower than our commercial peers. Also, we can guarantee the qualities of our products.