seamless linepipe: 1.grade:A,B,X42,X52,X56,X60,X65,X70,X80 2.standard:API 5L seamless ... , coupling, bell and spigot .The grades are A,B,X42,X52,X56,X60,X65,X70,X80.The workmanship is ERW,SSAW ... and LSAW. StandardAPI5LOD1/4"-112"MaterialA,B,X42,X52,X56,X60,X65,X70,X80TypeSeamless, weldingEndPlain, bevelConnectionWelding ends, coupling, bell ...