... , oil and natural gas and so on. Seamless steel ingot is made of perforated or solid through the capillary tube, ... the hot-rolled, cold-rolled or cold call is made. Seamless steel pipe with a hollow cross section, a large ... ApplicationCasing and TubingJ55,K55,N80,L80,C90,C95,P110API SPEC 5CT,ISO1196060.23-508.00*4.24-16.13Tubing ... ,X42,X46,X52,X56,X60,X65,X70,X80 API SPEC 5L,GB/T9711.1,GB/T9711.232-1240*3 ...