api 5l line pipe x42 1.Suitable for conveyance of gas, petroleum, liquid, and electricity; 2 ... . OD: 21.3-457.2mm api 5l line pipe ... Q345B,X46,X52,X60,X70,X80 etc11.UsageFor line pipe in petroleum and natural gas , water and gas ... , mineral slurry. Also for chemical industry, building structure and pile driving, etc.12 ...