API spec. 5CT standard , seamless, steel grade of J55, K55, N80, L80-1, P110 Casings and Tubes .
API spec. 5 L standard , seamless , SSAW , LSAW , ERW , PSL1 & PSL2 , steelgGrade of A, B,
X42, X52, X60, X65, X70 line pipes . API Spec. 7 & API Spec. 5D drill Pipes .