16Mn seamless steel pipe belongs to carbon manganese steel, the carbon content is about 0.16%, and the yield point is equal to 343mpa (the strength grade is 343mpa). 16Mn seamless steel pipe has less alloy content and good weldability, so preheating is not necessary before welding.
However, as the hardening tendency of 16Mn seamless steel pipe is slightly larger than that of low carbon steel, preheating measures should be taken to prevent cold cracks when welding at low temperature (such as outdoor operation in winter) or on structures with large rigidity and thickness.
