... industries Steel pipes for use as casing or tubing for wellsAPI 5CT CASING AND TUBINGBS EN ISO 11960 ... natural gas industries Steel pipes for use as casing or tubing for wellsNF M87-207 Petroleum and ... gas industries Steel pipes for use as casing or tubing for wellsJIS G3439 SEAMLESS STEEL OIL ... AND DRILL PIPEIS 4270 Steel tubes for well spainend casing pipesSteel Grade H40, J55, K55, N80, M65, L80 ...