... .Delivery Detail:20 daySpecificationsGrade K55, J55, N80, H40, L80, M65, C90, C95, T95, P110, Standard API 5CT Casing steel grade DZ40,DZ55 ... ,DZ753Standard API SPEC 5CTCasing steel grade H40 K55 M65 ... inside and outside surface quality, stable performance, welcomed by customers. API J55, API K55, API N80oil casing