As a petroleum machine and equipment manufacturer, Tubing and Casing pipe are main products of us. ASTM F480 - 06be1 Standards API 5CT oil casing pipe; Petroleum casing pipe 1. Standard: API 5CT-0735 & Grade: K55, J55, N80, H40, L80, M65, C90, C95, ... are the products standards which we supplied according to. Tubing and casing that manufactured by us are using high quality carbon steel.