1.seamless steel pipe size:dia 10mm-dia 630mm;material:10#-45# q345 a,b,c,d 27simn 40cr 40crmn 20crmn 30mn executive standard:gb8162 (structural pipe) gb8163 (fluid pipe) gb3087-99 (boiler pipe) gb5310-95 (boiler pipe for high pressure) gb6479-2000 (fertilizer special pipe) gb9948-88 (petroleum cracked pipe) din17175-95 (german standard) st45.8111 sa106b etc,foreign standard. 2.straight weld tubing,galvanized pipe size:dia 10mm-dia 630mm;material:q195-q235 16mn q345 a/b 3.welding square pipe/rectangular tube,galvanized square and rectangular pipe size:dia 12mm-dia 400mm;material:q195-q235 4.screw seam two submerged-arc welding pipe size:dia 159mm-dia 2200mm;material:q235b q345b --------------------------------------- e-mail:blesses6@21cn.com