High-strength high-toughness anticorrosion high-temperature bearing/pinion steel and preparation method thereof

Abstract

The invention relates to a high-strength high-toughness anticorrosion high-temperature bearing / pinion steel and a preparation method thereof, belonging to the technical field of bearing / pinion steel. The bearing / pinion steel comprises the following chemical elements in percentage by weight: 0.10-0.22% of C, at most 0.5% of Mn, at most 0.5% of Si, 12.0-15.0% of Cr, 1.50-3.00% of Ni, 4.00-6.00% of Mo, 0.50-0.90% of V, 12.0-15.0% of Co, 0.30-2.00% of W, 0.02-0.08% of Nb and the balance of Fe and inevitable impurities, wherein the V / Nb ratio is 25-35, the Mo / W ratio is 6-12, the Co / Mo ratio is 2-3, Cr+6Si+4Mo+1.5W+11V+5Nb<=52%, 40C+2Mn+4Ni+30N+2Co>=42%, and [O]+[N]+[H]<=0.0040%. The preparation method comprises the following steps: proportioning and controlling the components; carrying out vacuum smelting; carrying out hot working on a steel ingot to obtain a steel product; carrying out surface carburized hardening treatment on the steel product; and carrying out heat treatment on the steel product. The invention can satisfy the requirements of new-generation bearing / pinion steel for bearing the actions of high temperature and corrosive environment in the service process, and implements good cooperation of high strength, high hardness, high toughness, high temperature properties and anticorrosion property.

Description

technical field [0001] The invention belongs to the technical field of bearing gear steel, and in particular relates to a high-strength, high-toughness, corrosion-resistant, high-temperature bearing gear steel and a preparation method thereof. Background technique [0002] The development trend of high-performance bearing gear steel at home and abroad is mainly high strength, high surface hardness, high fracture toughness, wear resistance, corrosion resistance, temperature resistance, high fatigue strength and long service life. Early GCr15 bearing steel and AISI9310 gear steel are high-carbon integrally hardened steel and low-carbon case-hardened steel respectively. They are used at room temperature after low-temperature tempering. They have low alloy element content, medium strength and hardness, and their corrosion resistance is poor. lower. The subsequent development of bearing steel M50 and bearing gear steel CBS600, CBS1000M, M50NiL, medium alloy element content, and ...

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Problems solved by technology

Tempered at a high temperature above 500°C, it can be used stably in the temperature range of 315°C to 480°C, but its corrosion resistance is still poor

In the early days, 440C, as a corrosion-resistant bearing steel with poor tempering resistance, was mainly used in low-temperature corrosion-resistant environments; Good wear resistance and corrosion resistance, can be used at a high temperature of 480°C; BG42 steel is a modified steel of 14-4M steel, the purpose of the modification is to improve wear resistance by adding vanadium; WD-65 steel is in BG42 On the basis of bearing steel, 2-2.5% tungsten and 5-5.5% cobalt are added to further improve high-temperature performance and corrosion resistance. Due to the poor toughness and malleability of the above-mentioned corrosion-resistant high-temperature bearing steel, the composition adjustment is adopted Reduce molybdenum content, add alloy elements such as vanadium and niobium, and control the heat treatment process of steel, but its toughness is still low

Unable to meet the service conditions that withstand bending, torsion and require high fracture toughness

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