FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, specifically to bainitic steel used for the manufacture of connectors with external and internal threads for drill columns. Steel contains the following, wt%: C: 0.16–0.23, Si: 0.8–1.0, Mo: 0.67–0.9, Cr: 1.10–1.30, V: more than 0.3 to 0.4, Ni: 1.60–2.0, Mn: 0.65–0.9, P: ≤0.020, S: ≤0.02, Cu: <0.20, N: 0.005–0.012, the balance is Fe and unavoidable impurities.
EFFECT: longer service life of the drill string is achieved.
15 cl, 10 dwg, 6 tbl
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