... then finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 26 inch OD.At ... , gas pipe, API pipe, alloy steel pipe, carbon steel pipe and so on. Steel sheetmaterialDC01,SPCC,ST12,HJ58,HG60,DB685,16Mn ... pickling and so onProduction technologySeamless steel pipeWelded steel pipeSurface treatmentPolishing or not The stainless steel barstandardASTM,GBmaterial201,202,301,304, ...