... pipe is used for gas, water, and oil of conveying in petroleum 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 ... ,X56,X60,X65,X70,X80.The workmanship is ERW,SSAW and LSAW. StandardAPI5LOD1/4"-112"MaterialA,B,X42,X52,X56,X60 ...