... .,LtdBusiness TypeManufacturerProduction name api 5l x 52 carbon steel pipes Material45#,20# carbon steel20cr,40Cr,20CrMo low alloy steel Making process cold-rolled StandardBS,GB ... ,GB/T8162,ASTMA106,ASTMA53,DIN1629/3,DIN2391Grade10#,20#,45#,16Mn,ST35-ST52,low alloy steel Size OD18-121mm, thickness 2-25mmPlace of ...