Chromium alloy non-quenched and tempered steel wire rod and production method thereof

Abstract

The invention is suitable for the technical field of steel wire rod machining, and provides a chromium alloy non-quenched and tempered steel wire rod and a production method thereof. The chromium alloy non-quenched and tempered steel wire rod comprises the following chemical components of, by weight, 0.22-0.31% of C, 1.20-1.55% of Mn, 0.15-0.30% of Si, 0.30-0.40% of Cr, less than or equal to 0.012% of P, less than or equal to 0.008% of S; less than or equal to 0.05% of Ni, less than or equal to 0.05% of Cu, less than or equal to 0.03% of Mo, less than or equal to 0.003% of Al, less than or equal to 0.002% of Ti, less than or equal to 0.002% of O, less than or equal to 0.005% of N, 0.05-0.20% of V, and the balance Fe and inevitable impurities. According to the method, the carbon content isreduced, the manganese content is reduced, the carbon segregation of the wire rod is improved, the plasticity of the wire rod is slightly improved, the forming probability of net carbon is reduced bycombining high-temperature rolling and controlled cooling processes, and the user machining wire breakage rate is reduced, so that the production efficiency of the user is improved; and in the coolingprocess, the process design of proper quick cooling and then slow cooling is adopted, growth of grains is controlled, ferrite-pearlite zonal segregation is reduced, and meanwhile, the situation thatthe cold working performance is deteriorated due to too high strength caused by an abnormal quenching structure is avoided.

Description

technical field [0001] The invention belongs to the technical field of steel wire rod processing, and in particular relates to a chromium alloy non-quenched and tempered steel wire rod and a production method thereof. Background technique [0002] Chromium alloy is an alloy composed of chromium and other elements, which is a refractory alloy. Compared with metal nickel, metal chromium has a high melting point (1860°C), high specific strength (ratio of strength to density), good oxidation resistance and corrosion resistance to high sulfur, diesel fuel, and seawater; non-quenched and tempered steel is used in On the basis of medium carbon manganese steel, vanadium, titanium and niobium microalloying elements are added to make them dissolve in austenite during heating, because the solid solubility of vanadium, titanium and niobium in austenite increases with cooling decrease. The microalloying elements vanadium, titanium and niobium will be precipitated in the form of fine ca...

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Problems solved by technology

[0004] The invention provides a chromium alloy non-quenched and tempered steel wire rod and its production method, aiming at improving the tensile strength of the chromium alloy wire rod so as to achieve the purpose of omitting the subsequent quenching and tempering heat treatment, but the impact toughness is often reduced when the strength is increased. Lowering the problem

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