Welded steel pipe  Wui Tung Holdings Limited specializing in import and export trade. We provide seamless steel pipe and welded steel pipe. The follows are Welded steel pipe feature:  Outside diameter: OD159-OD3000 ( mm )  Wall thickness: 2 -50( mm )  Length: 4-12m  Steel grade: 301(1Cr17Ni17),304 Moderate Frequency (0Cr18Ni9),304 AOD (0Cr18Ni9),304L(00Cr19Ni10), 321M ode rate Freud ency (1Cr18Ni9Ti),321 AOD (1Cr18Ni9Ti), 316(0Cr17Ni12Mo2), 316L(00Cr17Ni14Mo2), 310S(0Cr25Ni20) ,317L(00Cr19Ni13Mo3)  standard: GB/T14975-2002, GB/T14976-2002, GB13296-91, GB9948-88 , ASTM/ASME A213/SA213, ASTM/ASME A312/SA312, ASTM/ASME A269/SA269,DIN 17458-85, DIN 17456-85,JIS G 3459, JIS G 3463,JIS G 3448 JIS G 3446.  Quantity of product: Annual productive output 15000MT  Packing: General bunch packing / wooden case / negotiating packing  With the perfect ISO9002:2000 quality guarantee system and all round sincere service, the company is willing to sincerely cooperate with customers from home and abroad.