... ,X52,X56,X60,X65,X70,X80 2.standard:API 5L seamless linepipe The line pipe is used for gas, water, and ... of conveying in petroleum and natural gas industries.It includes seamless and welding pipe. The pipe end is plain or thread ... , weldingEndPlain, bevelConnectionWelding ends, coupling, bell and spigotWorkmanshipERW,SSAW,LSAW oil carbon steel seamless linepipe