... internal and external users with superior qualityand reasonable price. JL pipe always puts quality as the core, targets ... implement and improves the management system.In addition,JL pipe has passed the API 5L and API ... rolled, weldedProduction StandardAPI 5LSteel gradeAPI 5L GR.A,B,X42,X52,etcO.D48.3-1524mmW.T3.68-25mmLength5 ... treatmentPackage Our products' picture api 5l gr.b black steel line pipe