... seamless oil casing pipe 2 as per API 5L GrB/5CT J55,K55,N80,L80,P110 2 grade 10#-45# 3 the price ... .B,X42,X46,X52,X56,X60,X65,X70, etc11.Usagefor petroleum/ natural gas pipeline , for conveying water,drainage,coal gas, mineral ... 14.Application: Seamless steel pipes for low and medium pressure boiler, high pressure boiler, and ship-building, liquid service, petroleum cracking, chemical ...