... : API, ISO, KR 3. Market:worldwide 65mm Wall Thickness carbon seamless steel pipe Key wordsSteel PipeNameCarbon Seamless Steel ... ,STPT42,STB42,STS42,STPT49,STS49TechniqueHot Rolled Surface TreatmentHot galvanized,Cold galvanized,Painted black,varnish paint,anti rust oil,3PE ... ,etcCapacity10,000tons/month Advantages1.without oxidation both outer wall and inner wall2.under high pressure without leakage3. ...