Seamless Steel Pipe 37Mn,34Mn2V,35CrMo,34CrMo4,ASTM A519 413X. Delievery condition:Hot rolled/Q+T Size:OD:325-559mm. Cylinder seamless pipes are made from alloy steel material.Supposed to keep the gas such as: acetylene, hydrogen, oxygen, nitrogen ,Co2,Co, liquefied petroleum gas etc. cylinder seamless steel pipe