... m 4.Steel Grade: Q235A, Q235B, Q345API 5L: GR A, GR B, X42,X46, X56, X60,X65,X70, ... A252 GR 1, GR 2, GR 3ASTM A53: GR A, GR B, GR C, GR DBS 4360: Grade ... and oil; construction and piling Cangzhou Manier Import-Export Trading CO., LTD is a professional manufacturer & exporter of API casing pipe, seamless ... factory is located in Tianjin Jinghai Development Zone, a well-known Steel City in China. If you ...