... 5L GB/T9711 2.Steel grade:API 5L B,X42,X52,X60,X65,X70 3.technology: seamless pipe seamless steel pipe1.standard: API ... 5L GB/T97112.Steel grade:API 5L B,X42,X52, ... X60,X65,X703.technology: seamless pipe4. we are direct and professional manufacture of seamless steel pipes for severl years1. Main detailsProduct ...