HIGH STRENGTH LOW ALLOY STEEL FOR AGRICULTURAL MACHINERY Russian patent published in 2023 - IPC C22C38/34 C22C38/32 C22C38/28 C22C38/26 C22C38/22 C22C38/38 C21D1/18 

FIELD: metallurgy.

SUBSTANCE: high-strength steel for the manufacture of critical elements of agricultural earthmovers. The steel contains elements in the following ratio, wt.%: carbon 0.32-0.35, silicon 1.6-1.8, chromium 0.5-0.7, manganese 1.0-1.5, molybdenum 0, 2-0.3, niobium 0.03-0.05, titanium 0.02-0.04, boron no more than 0.01, aluminum no more than 0.01, sulfur no more than 0.01, phosphorus no more than 0, 01, iron and inevitable impurities - the rest. After hardening from a temperature of 900°C into the water and drawing at a temperature of 200 to 500°C for 60 minutes followed by air cooling, it has a uniform tempering martensite structure.

EFFECT: high strength, ductility and impact strength of steel.

1 cl, 1 tbl, 3 ex