API Spec 5L PSL1 is a international standard specifies requirements for the manufacture of twoproduct specification levels (PSL 1 and PSL 2) of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries. Line pipes can be used for a wide range of conveying of gas, water and oil in petroleum and the tubes are suitable for cold bending and galvanizing at the customer’s request.API Spec 5L PSL1 Standard main steel grade:API Spec 5L GrB,X42,X52,X65,X70 and so on.