Seamless pipes for oil and gas (OCTG) — casing and tubing pipes for wells. Casing: ∅114–426 mm, for securing well walls and isolating formations. Strength grades: J55, K55, N80, L80, P110 (API 5CT). Threads: Buttress (BTC), Premium (gas-tight). Tubing: ∅60–114 mm, for oil/gas production. Threads: EUE, NUE. Testing: 100% hydrostatic test, ultrasonic testing, radiography (on request). GOST 632-80 (casing), GOST 633-80 (tubing), API 5CT. Anti-corrosion coating: varnish, VUS, CRA liner (for H₂S wells). Premium gas-tight threads: for wells with H₂S, CO₂, high pressure. Provides sealing up to 100 MPa. Manufacturers: TMK, ChTPZ, Tenaris, Vallourec. Documentation: API 5CT certificate, test report, drift control (passability check with gauge). Products comply with GOST and international standards. Export documentation: quality certificate, test report. Bulk supplies. Technical consultation.