HIGH-STRENGTH WEAR-RESISTANT STEEL FOR AGRICULTURAL MACHINES (VERSIONS) Russian patent published in 2017 - IPC C22C38/54 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, specifically high-strength and wear-resistant steel, used in making heavily loaded parts of working elements of tillage, sowing, fodder harvesting, vegetable harvesting and other agricultural machines. Said steel contains, wt%: carbon from more than 0.30 to 0.35, chromium 0.30–0.50, nickel 0.25–0.40, copper 0.20–0.40, molybdenum 0.05–0.15, silicon 0.10–0.30, manganese 0.80–1.00, vanadium 0.01–0.03, niobium 0.01–0.04, boron 0.001–0.005, titanium 0.01–0.03, aluminium from 0.01 to less than 0.05, nitrogen not more than 0.015, calcium 0.001–0.02, sulphur of not more than 0.020, phosphorus not more than 0.020, iron and impurities – balance, wherein total content of phosphorus and sulphur is not more than 0.025.

EFFECT: steel has guaranteed yield point for three versions respectively of not less than 1,200 MPa, relative elongation of not less than 7–8 %, impact strength value at +20 °C of not less than 20–30 J/cm², relative uniform elongation of not less than 2–2,5 % and high wear resistance.

3 cl, 2 tbl, 1 ex