1)standard :GB,ASTM ,DIN , 2)grade : 10#,20#,45#,16Mn 3)outer diameter :6-630mm 4)thickness :1-6mm SPECIFICATIONS 1)spiral wels steel pipe as per 10#20#,45#,16Mn 2)Standard & material :GB,ASTM , DIN . 3) outer diameter :6-630mm.thickness :1-6mm,length :5.8m,6m,11m 4)method of galvanizeation : cold drawn 5) surface: print protect,ends beveled or other dealing as customomers' demand 6)application : ...