Kinds of steel pipes / tubes: 1、 Seamless steel pipes: Material: 10#, 20#, 35#, 45#, 50#, Q345B, 16Mn, 27SiMn, 35CrMo, 15CrMo, 12Cr1MoV, 20Cr, 40Cr, 37Mn30CrMo Standard: GB8162-1999, GB8163-1999, GB3087-1999, GB5310-1999 2、Square tube(rectangular tube): Material: Q235, Q345, seamless steel, 20#, 16Mn, stainless steel 3、Primary carbon steel pipe: Material: 10#, 20#, 35#, 45#, 20G, 410, American Standard: A106B, ST45.8-III Standard: Liquid transportation pipe GB/T8163-1999 Low-middle pressured boiler pipe GB3087-1999 High-pressured boiler pipe GB5310-1995 SPECIAL FERTILIZER pipe GB6479-2000 Oil cracking pipe GB9948-1998 Marine steel pipe GB5312-1999 4、Stainless steel pipe: Material: National Standard: (American Standard), 1Cr18Ni9Ti, 0Cr18Ni10Ti (321), 0Cr18Ni9 (304), 00Cr18Ni10 (304L), 0Cr17Ni12Mo2 (316), 00Cr17Ni14Mo2 (316L), 0Cr25Ni20 (310S) Standard: GB/T14975-2002, GB/T14976-2002, GB/T13926-91, GB/T9948-88 5、Welded steel pipe: Material: Q235, Q235B Standard: GB/T3092-93 6、Galvanized steel pipe: Material: Q235, Q235B 7、Alloy steel pipe: Material: National Standard: (American Standard), 12Cr1MoV (A335P91), 15CrMo (A335P12), Cr5Mo (A335P5), 10CrMo910 (A335P22), 1+Cr+Mo (A335P11), Cr9Mo (A335P9), 16Mn (Q345B) (27SiMn), 07Cr2AlMo, 09CrMoAl, 12Cr1MoVG, 15CrMoG, 12Cr2MoWVTiB, 5CrMo, T91, T92 Standard: GB5310-1995,GB9948-88, GB6479-2000, DIN17175-79, ASTM A335/335M, ASTM 8、Low alloy pipe: Material: 16Mn, Q345B, Q345C, Q345D; Standard: GB/T8163-1999 9、High pressure boiler tube: Material:: National Standard: (American Standard:) 20G GB5310-1995 (ST45.5-III, DIN17175-79), 12CrMoV (T12), 10CrMo910 (12Cr2Mo) 15CrMo (A335P11), Cr5Mo (SA106B), 12CrMoVG, 15 Cr1MoVG, 12Cr1MoVG GB5310 (ASMESA210/SA106), 15Cr1MoVG GB5310 (ASMESA210/SA106). 10、Low / medium pressure boiler tube: Material: 20G, 16Mn Standard: GB3087-99 11、Alloy structural pipe: Material: 20Cr, 30Cr, 40Cr 12、Spiral tube: Material: Q235, Q235B, Q345 13、Pipes as per Japanese Standard:: Material: JISG3454, G3455, G3456 14、Pipes as per American Standard:: Material: T2, T5, T11, T12, T22, T23, T91 Standard: ASTM A-213, ASTM A-106B 15、Flat oval: Material: ordinary carbon steel, seamless steel, 20#, 16Mn, stainless steel 16、Oval: Material: ordinary carbon steel, seamless steel, 20#, 16Mn, stainless steel 17、Corrugated pipe: Material: 10#, 20#, 16Mn, 0Cr18Ni9 (304) 18、Petroleum cracking pipe: Material: 20#, 16Mn Standard: GB9948-1988 19、Special pipe for fertilizer: Material: 20#, 20G, 16Mn Standard: GB6479-2000, GB6479-86 20、Petroleum steel pipe: Oil pipe J55 (37Mn5), casing pipe J55 (37Mn5), H40, K55, M60, N80 Standard: API 5CT 21、Geological pipe: Material: 35CrMo, DZ40, DZ50, DZ60, N80 22、Shipbuilding pipe: Material: 20#, 16Mn 23、Double-faced submerged-arc welding spiral tube: Material: Q235, Q235B, Q345, 20#, X42-65 Standard: APISpec5L, GB/T9711.1/2-97/99, SY/T5037-2000 24、Fluid pipes: Material: 20#, DZ40, Q345, Q345A, Q345B, Q345C Standard: GB3087-1999, GB8163-1999, YB23-70 25、Straight seam electric resistant welded pipe: Material: Q235, Q235B, Q345, 20#, J55, X42-65 Standard: GB/T3091-2001, APISpec5L, GB/T9711.1/2-97/99, GB/T13793-92 26、Pipes for transporting petroleum and natural gas: Material: A, B, X42, X46, X52, X56, X60, X70, X80 Standard: GB/T9711 API-5CT 27、Hydraulic supporting tube: Material: 27SiMn, 10#, 20#, 35#, 45#, 20Cr, 40Cr Standard: GB8162-87 28、Shaped tube: Material: 20#, 45#