TWO-LAYERED STEEL FLAT ROLLED STOCK AND ITEM MADE FROM IT Russian patent published in 2014 - IPC C22C38/58 C22C38/48 C22C38/46 C22C38/44 C22C38/42 B32B15/01 B32B15/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, and namely to two-layered flat rolled stock with thickness of 10-50 mm, which consists of a layer of wear-resistant steel and a layer of weldable steel for manufacture of weld structures subject to impact abrasive wear and operating at the temperature of up to -40°C. Wear-resistant steel contains the following, wt %: carbon 0.25-1.2, silicon 0.2-1.8, manganese 0.3-2.0, phosphorus not more than 0.025, sulphur not more than 0.025, chrome 0.3-6.5, nickel 0.03-2.0, one or more elements of the following group: molybdenum 0.2-1.5, tungsten 0.5-1.5, copper 0.05-0.4, niobium 0.01-0.1 and vanadium 0.02-0.7, and iron and inevitable impurities are the rest. Weldable steel contains the following, wt %: carbon 0.002-0.3, silicon 0.10-0.6, manganese 0.4-1.8, phosphorus not more than 0.02, sulphur not more than 0.01, chrome 0.01-0.4, nickel 0.01-0.5, one or more elements of the following group: copper 0.01-0.4, molybdenum 0.01-0.1, niobium 0.01-0.1 and vanadium 0.02-0.1, iron and inevitable impurities are the rest. Carbon equivalent of weldable steel is not more than 0.45, thickness of a layer of wear-resistant steel is 10-40% or 60-90% of total thickness of rolled stock, and adhesion strength of layers is at least 450 N/mm².

EFFECT: after heat treatment items made from rolled stock at optimum consumption of alloy elements have high wear resistance, hardness of at least 500 HBW, high strength of a layer from weldable steel with yield point of at least 500 MPa, in a combination with good weldability and impact viscosity on a sharp notch at the temperature of up to -40°C of at least 30 J/cm².

2 cl, 2 tbl