55mm Wall Thickness carbon seamless steel pipe 1. WT: 10-80mm, ... :232-426mm 2. Certificate: API, ISO, KR 3. Market:worldwide 55mm Wall Thickness carbon seamless steel pipe Key wordsSteel PipeNameCarbon Seamless ... leakage3.high-precision4.high finish5.no deformation after cold bending 55mm Wall Thickness carbon seamless steel pipe