Quality :Grade A Certificate:ISO9001:2000 Material: carbon stee ,stainless steel ,forged carbon steel ,alloy ... Welded Steel Pipe: ERW Steel Pipe, Spiral Steel Pipe 4. Material: Carbon Steel: ASTM A106 Gr. B, ASTM A53, Gr ... oil, 3PE coating, Epoxy coating. 8. Test: Chemical composition analysis, Mechanical Properties test, Eddy current, hydrostatic, Ultrasonic, Intergranular Corrosion. 9. Applications: ...