... "~20" Steel grade: J55, K55, N80, L80 Thread Type: LTC, STC, BC Quality Control: ISO9001Product Descriptionoil pipeCasing is a large-diameter ... "Steel grade: J55, K55, N80, L80, P110, Q125Thread Type: LTC, STC, BCProduction Standard: API SPEC 5L\API SPEC 5B 2. Quality ...