Low-cost, ultra-pure, high-strength and high-toughness low-carbon stainless bearing steel and preparation method thereof

Abstract

The invention discloses low-cost, ultra-pure, high-strength and high-toughness low-carbon stainless bearing steel and a preparation method thereof. The bearing steel is prepared from the components including 0.13%-0.30% of C, 0.05%-0.2% of Si, 0.02%-0.1% of Mn, 13.6%-16.80% of Cr, 2.1%-4.0% of Ni, 12.5%-17% of Co, 5%-6% of Mo, 0.7%-2.5% of W, 0.7%-1.2% of Nb + V, less than or equal to 0.025% of P+S+Ti, less than or equal to 0.0012% of Ti, less than or equal to 0.0007% of O, less than or equal to 0.0015% of N+H, less than or equal to 0.0014% of N, 0.05%-0.08% of Al, 0.005%-0.015% of Ce, 0.005%-0.02% of La, 0.01%-0.03% of Y, and the other element of Fe. The preparation process route comprises the steps of molten steel primary smelting, AOD refining, LF refining, IC casting, VIM smelting, ESR electroslag remelting and VAR vacuum consumable remelting. Compared with the prior art, the low-carbon stainless bearing steel is lower in production cost, higher in strength and toughness, longer in fatigue life and extremely low in oxygen and nitrogen impurity content.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and more specifically relates to a low-cost ultra-pure high-strength toughness low-carbon stainless bearing steel and a preparation method thereof. Background technique [0002] Stainless bearing materials are widely used in aerospace, aviation, nuclear industry and high-tech products. Therefore, stainless steel bearing materials must not only have good corrosion resistance, but also have high toughness, high temperature hardness and high contact fatigue. Lifespan etc. The stainless bearing steel in the prior art generally has high carbon content and high chromium content, so it will inevitably produce large eutectic carbides. In actual use, when the bearing bears a large load , It is easy to cause stress concentration at the eutectic carbide and generate fatigue crack source, which will damage the service performance and contact fatigue life of the bearing. [0003] After searching, the...

AI Technical Summary

Problems solved by technology

Vacuum induction + vacuum self-consumption remelting cannot effectively absorb inclusions in steel like electroslag remelting; while vacuum induction + electroslag remelting, although electroslag remelting can absorb inclusions, it cannot effectively reduce Nitrogen and hydrogen content in steel

Therefore, the key component design and production process of this application can not ensure to obtain ultra-pure stainless bearing steel