X70 spiral welded pipe Material: X42, X52, X46, X56, X65, X70, L235 Q235B, ... : API 5L, SY/T 5037, GB/T 9711 219-2420mmSpiral Welded Pipe 1) Material: X42, X52, X46, X56, X65, L235, Q235B ... different anti-corrosion protection for steel pipe and pipe with flange. External coating: -multi-layer FBE (fusion bonded epoxy) coating -3 ...