... engineering, etc The feature of our precision seamless steel pipeItems SpecificationsStandardGBDINASTMGB/T8162-1999 GB/T8163-1999 ... , St52, St45, St35.8, ST35 Technique Cold rolled, Cold drawn Thickness1-14mm , or as your requirements Outer ... , St52, St45, St35.8, ST35 Technique Cold rolled, Cold drawn Thickness1-14mm , or as your requirements Outer ... me! DIN 2391 precision seamless steel pipe