General materials of Welded Steel pipes: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13,1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and etc.
The material of welded pipes is teel plate or strip steel, it is divided to furnace butt-weld pipe, electric resistance welding and automatic arc welding tube according to different welding technical. Also it can divided to longitudinal welded pipe and spiral welded pipe based on the welding form. And round welded pipes and hollow section(square or rectangle). Mostly, we will classify them according to material and usage as below:
GB/T3091-2008: Low pressure fluid conveying / welded steel pipe; Main usage is water transportation, coal gas, oil and steam water and gas for low prossure fluid and other usages. Typical grade:
Q235A
GB/T14291-2006: Mine fluid conveying / welded steel pipe; Main usage mine pressure wind, drain away water, shaft gas with straight seam welded steel pipe. Typical grade: Q235A、B.
GB/T12770-2002: Mechanical structure with stainless welded steel pipe; Main usage mechanical, automobile, bicycle, furniture, hotel and resteraunt and other mechanical and structure. Typical grade 0Cr13、1Cr17、00Cr19Ni11、1Cr18Ni9、0Cr18Ni11Nb.
GB/T12771-1991: Fluid conveying with stainless welded steel pipe. Mainly used for low pressure corrosive medium, and typical grade 0Cr13、0Cr19Ni9、00Cr19Ni11、00Cr17、0Cr18Ni11Nb、
0017Cr17Ni14Mo2.
Others: decorative welded stainless steel pipe(GB/T 18705-2002), structure decorative welded stainless steel pipe(JG/T 3030-1995) and heat exchanger(YB4103-2000).
