... and pushed or pulled over a form until the steel is shaped into a hollow tube. The seamless pipe is ... bridge, structuralsteel for ship stainless steel production:The details of my companyThe stainless steel sheet/coil/stripstandardASTM,GBmaterial201,202 ... technologySeamless steel pipeWelded steel pipeSurface treatmentPolishing or not The stainless steel barstandardASTM,GBmaterial201,202,301,304,316, ...