METHOD TO PRODUCE METAL PRODUCT WITH SPECIFIED STRUCTURAL CONDITION Russian patent published in 2014 - IPC C21D8/02 C21D1/20 C22C38/04 C22C38/12 C22C38/16 C22C38/58 

FIELD: metallurgy.

SUBSTANCE: stock is made of steel containing wt %: C 0.05-0.18, Si 0.05-0.6, Mn 1.30-2.05, S not more than 0.015, P not more than 0.020, Cr 0.02-0.35, Ni 0.02-0.45, Cu 0.05-0.30, Ti not more than 0.050, Nb 0.010-0.100, V not more than 0.120, N not more than 0.012, Al not more than 0.050, Mo not more than 0.45, iron and unavoidable admixtures - balance. The stock is heated, and rough rolling is carried out under temperatures exceeding temperature of austenite recrystallisation, with a deformation-to-deformation pause, providing for required reduction of metal temperature, then finishing rolling is carried out, straightening and accelerated cooling of rolled metal, at the same time heating temperature for rolling T is set to ensure required solubility of carbides and nitrides of microalloying elements, and using the following dependence: t+280°C<T<t+310°C, where t=883-313.95C+37.88Si-9.58Mn-2.79Cr-15.99Ni-2.55Cu+110.18Ti+5.5Nb+76.74V-142.53N+71.45Al+23.67Mo, °C, and heat removal from the rolled metal surface in process of accelerated cooling is sent to ensure formation of the required volume share of bainite in the cross section of the metal product.

EFFECT: provision of required level of consumer properties of rolled metal.

3 cl, 4 ex