HIGH-STRENGTH STEEL WIRE Russian patent published in 2019 - IPC C22C38/34 C22C38/30 C22C38/24 C22C38/22 C21D8/06 C21D9/52 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly, to production of elongated steel element with noncircular cross-section and is in hardened state, which is used to produce spring wire or ropes. Extended steel element has steel composition containing in wt. %: carbon from 0.20 to 1.00, silicon from 0.05 to 2.0, manganese from 0.40 to 1.0, chromium in range from 0.0 to 1.0, sulphur and phosphorus separately up to 0.025, nickel, vanadium, aluminium, molybdenum or cobalt separately to 0.5, iron is the rest and unavoidable impurities. Steel has martensite structure including martensite grains, in which the share of oriented martensite grains is at least 10 %.

EFFECT: obtaining an elongated steel element with the required high level of strength while maintaining the required ductility.

15 cl, 10 dwg