... Material grade: J55, K55, N80, L80, T95, 6 5/8" bushing pipeCasing and Tubing Standard: API 5CT ... ,Carbon Steel 6 5/8"ZS300MeterLength: R2, R3.Application: serves ... fluids.5, ASTM A179 For tubed heat exchanger and similar heat conveying equipments6, ASTM A192 For manufacture ... boiled pipe10,20GB3087-199910-530*2-40Over-heat pipe for low and medium pressure boiler, ...