... drilling fluid to circulate and extraction to take place. Steel Casing Pipes have smooth wall & minimum yield strength of 35,000 ... , NFM87-207, JIS G3439, ISO 4270, GOST 632-80Material:H40, J55, K55, N80-1, N80Q, R95, L80-1, L80-9Cr, L80 ... , T95, C110, P110, Q125, V150Annual output:150000 tons3. Thread type:Casing: STC, LTC, BTC, OTTM, OTTG, BTO, NEW VAM, VAM TOP ...