Size:  O.D: 6-224 mm.

  W.T: 1-15 mm.

Material: St 35, St37, St45, St 52; E215, E235, E355.

Standard: DIN 2391-1/EN 10305-1.

Delivery Condition：NBK(+N),  GBK(+A),  BK(+C),  BKW(+LC),  BKS(+SR).

Main Character:   

1. No oxidation layer on the outer and inner walls.

2. No leakage under high pressure.

3. High precision.

4. High Cleanness.

5. No distortion after cold bending.

6. No crack under flaring and flattening.