A kind of high strength and high nitrogen rare earth stainless bearing steel

Abstract

The invention discloses a high-strength and high-nitrogen rare earth stainless bearing steel, which comprises the following components in weight percent: 0.25-0.35% carbon, 0.5-1% silicon, 0.5-1% manganese, 14-16% chromium, and 0.85-1.1% molybdenum %, vanadium 0.1-0.18%, nitrogen 0.3-0.5%, rare earth elements 0.005-0.05%, nickel ≤ 0.5%, phosphorus ≤ 0.01%, sulfur ≤ 0.002%, iron balance. The present invention is a kind of martensitic stainless steel, which has the composition characteristics of high nitrogen, medium carbon and low nickel, and micro-alloying of rare earth elements is added. Through optimized element selection and content limitation, it is ensured that the stainless steel has high strength, High hardness, high corrosion resistance, good impact toughness, good dimensional stability and high temperature resistance.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a high-strength and high-nitrogen rare earth stainless bearing steel. Background technique [0002] Bearings are important components of various mechanical equipment, used to support shafts or rotating parts on shafts, and are widely used in many fields such as aerospace, rail transit, machinery manufacturing, and automobile transportation. Since bearings are mostly used in harsh environments such as high contact stress, multiple cycle contact stress and sliding wear, the main damage of bearings includes two forms of contact fatigue damage and wear damage, which put forward strict requirements on bearing performance, such as high strength , Anti-friction and wear, fatigue resistance, impact resistance, corrosion resistance, high temperature resistance, etc. [0003] Among the bearing steels, high-carbon chromium martensitic stainless bearing steels, such as 9Cr...

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Problems solved by technology

This invention is a high-nitrogen steel with low carbon content. Rare earth elements are also added to improve the shape and distribution of inclusions and refine grains, which optimizes the performance of stainless steel to a certain extent, but has the following shortcomings: The optimization of corrosion performance does not mention the effect of reducing carbon and adding nitrogen on strength and hardness. The invention covers a wide range of nitrogen content and a high upper limit, while the carbon content is very low, and the nitrogen content is too high or the carbon content is too low. Negative impact; ②The nickel content is still high. On the one hand, nickel will reduce the solubility of nitrogen and increase the difficulty of the process; on the other hand, nickel will hinder the transformation of austenite to martensite during heat treatment, resulting in residual austenite The increase in volume affects the dimensional stability and wear resistance of steel; in addition, the price of nickel is expensive, which increases the cost of stainless steel

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