Non-molybdenum non-nickel middle chrome wear resistant steel casting and heat treatment method thereof

Abstract

The invention belongs to the technical field of metal wear-resistant materials and particularly relates to a wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium and a heat treatment method thereof. The wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium comprises the components of the following mass percentages: 0.35 to 0.65 wt percent of C, 5.0 to 7.0 wt percent of Cr, 0.003 to 0.006 wt percent of B, 0.2 to 0.5 wt percent of Si, 0.8 to 1.0 wt percent of Mn, 0.03 to 0.08 wt percent of Y, 0.05 to 0.15 wt percent of Ti, 0.04 to 0.08 wt percent of V, 0.02 to 0.05 wt percent of N, less than 0.04 wt percent of S, less than 0.05 wt percent of P and the balance of ferrite. The wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium can be manufactured by an electric furnace using a sand casting. The invention carries out step quenching by using two types of quenching oils with different temperatures, thus leading to depth of more than 60mm of the quenching full hardening layer of the cast steel, high hardness, good uniformity of the hardness, and no cracks in the heat treatment. The casting steel is free of expensive alloying elements such as molybdenum or nickel, raw materials resource is rich, the manufacture cost is low and economic benefit is good.

Description

Technical field [0001] The invention belongs to the technical field of metal wear-resistant materials, and particularly relates to a molybdenum-nickel-free medium-chromium wear-resistant cast steel and a heat treatment method thereof. Background technique [0002] Abrasion is a common form of material failure in the metallurgy, mining, electric power, machinery, petroleum, chemical, building materials, and military industries. The development of new wear-resistant materials to meet the needs of these sectors has always been a topic of constant concern to materials researchers. [0003] Chinese invention patent CN1150979 discloses a high-chromium wear-resistant cast steel. Its chemical composition and weight percentage are as follows: C: 1.2-2.5wt%, Mn≤0.6wt%, Si≤0.6wt%, Cr: 11.5-13.5 wt%, Mo: 0.7-1.2wt%, Cu: 0.5-1.0wt%, V: 3.5-4.5wt%, Re: 0.03-0.05wt%, S: ≤0.06wt%, P≤0.06wt%, the rest is Fe, not only has high hardness, but also high strength and toughness. It has a wide range of ...

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Problems solved by technology

[0007] The object of the present invention is to provide a molybdenum-nickel medium-chromium wear-resistant steel casting and its heat treatment method, aiming at solving the problem of high production cost caused by the molybdenum and nickel contained in the wear-resistant steel in the prior art

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