... .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, , 5" oil casing pipeCasing and Tubing Standard: API ... as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, 7" casing ... Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, 7 5/8" oil casing pipeCasing and Tubing Standard: ... win-win. API 5CT J55,K55,N80,L80 oil drilling use carbon steel welded ...