sell spiral steel pipe Q235 standard:API,ASTM,ASME,ANSI,JIS, ... ,ISO material:API 5L, A53,A106,A333 GR6,Q235,Q345 sell spiral steel pipe Q235 SSAW (Spiral Submerged-arc Welded) Quality ... pipe and then jointed with bolts. Test:Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties ( Bending ...