seamless linepipe: 1.grade:A,B,X42,X52,X56,X60,X65,X70,X80 2.standard:API 5L seamless linepipe The line pipe is used ... and natural gas industries.It includes seamless and welding pipe. The pipe end is plain or thread. And the connection are welding ... ends, coupling, bell and spigot .The grades are A,B,X42,X52 ...