Steel for wind turbine main shaft bearing and production method of steel

Abstract

The invention relates to steel for a wind turbine main shaft bearing and a production method of the steel. The steel comprises the following chemical compositions: 0.10-0.30% of C, 0.10-0.50% of Si, 0.30-0.80% of Mn, 1.30-1.60% of Cr, less than or equal to 0.025% of S, less than or equal to 0.025% of P, 3.25-3.75% of Ni, less than or equal to 0.30% of Cu, 0.15-0.25% of Mo, 0.005-0.05% of Al, 0.005-0.015% of N, less than or equal to 0.0010% of Ca, less than or equal to 0.003% of Ti, less than or equal to 0.0015% of O, less than or equal to 0.04% of As, less than or equal to 0.03% of Sn, less than or equal to 0.005% of Sb, less than or equal to 0.002% of Pb and the balance of Fe and unavoidable impurities. The production process comprises the following steps: hot metal pretreatment, converter or electric arc furnace smelting, LF refining, RH or VD furnace refining, large section continuous casting CCM large continuous casting slab, continuous rolling and finishing, wherein continuous casting slab and rolling slab are all put into pits for slow cooling and softening annealing; the steel is high in purity, tissue uniformity and density, can replace electroslag steel, and meets the requirements on steel for the wind turbine main shaft bearing.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically relates to bearing steel and a corresponding production process. Background technique [0002] Wind energy is currently the most promising renewable energy. It is a clean, non-polluting green energy. Among various alternative energy sources, wind energy has the broadest prospects for utilization, and it has attracted more and more attention from all countries in the world. huge. [0003] Wind turbine bearings are important transmission devices in wind turbines, and a wind turbine can use up to 32 sets of bearings. Therefore, the selection of bearings is very important to ensure the safe and stable operation of wind turbines. Wind turbine bearings are generally divided into the following categories: yaw bearings, pitch bearings, main shaft bearings, speed increaser bearings and generator bearings. Depending on the type of bearing, the technical requirements are also dif...

AI Technical Summary

Problems solved by technology

However, the electroslag remelting production process also has obvious disadvantages such as production efficiency, very low production capacity, and very high energy consumption and production costs. Therefore, the market competitiveness of electroslag remelting steel is very low

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