Alterant for high-chromium cast iron and preparation method thereof

Abstract

The invention relates to an alterant for high-chromium cast iron and a preparation method thereof. The alterant comprises, by mass, 71-75% of Cr, 10-11.5% of Ni, 0.9-1.3% of Mo, 1.1-1.45% of Mn, 0.2-0.28% of V, 0.7-1.2% of Zn, 0.8-1.0% of Cu, 0.18-0.25% of B, 0.15-0.2% of N, 0.15-0.2% of Zr, 0.26-0.3% of Nb, 0.15-0.2% of Co and the balance of Fe and impurities. The preparation method comprises the following steps of: weighing the raw materials according to the ratio, smelting the raw materials and atomizing into powder. The alterant does not contain rare earth, so that the cost is low, and the requirements of basic national conditions and sustainable development are met; the chromium-nickel content facilitates absorption and utilization of high-chromium cast iron; Si is not contained, so that the wear resistance of the high-chromium cast iron cannot be influenced; and the mechanical property of the high-chromium cast iron can be obviously improved.

Description

technical field [0001] The invention relates to a modifier for high-chromium cast iron, which belongs to the technical field of metal materials and processing. Background technique [0002] High chromium cast iron is the third generation of white cast iron developed after ordinary white cast iron and nickel hard cast iron. Due to its good wear resistance, it is recognized as a wear-resistant material with excellent performance. It is used in mining, cement, metallurgy, electric power and so on are widely used. High chromium cast iron generally contains chromium between 12% and 28%. The addition of a large amount of chromium makes the M in white iron 3 C-type carbides become M 7 C 3 Type carbide, M 7 C 3 Type carbide has high hardness, which makes high chromium cast iron have good wear resistance. Wear-resistant high-chromium cast iron also has shortcomings. Due to the high hardness of high-chromium cast iron, it will often fail due to poor toughness under some harsh op...

AI Technical Summary

Problems solved by technology

[0007] (1) At present, almost all the modifiers related to iron and steel materials use rare earth alloys as the main element. Rare earth is a scarce resource in our country, so the large-scale use of rare earth is costly and does not conform to the basic national conditions of our country;

[0008] (2) At present, the modifiers basically contain silicon. In actual production, the silicon content in high-chromium cast iron needs to be strictly controlled. In addition, the silicon content of high-chromium cast iron itself has exceeded the standard. agent, which has an impact on the performance of high chromium cast iron, so it is imminent to develop a silicon-free modifier;

[0010] (4) At present, most of the modificators have no detailed description of the mechanism of metamorphism. If the principle is uncertain, the metamorphic effect will be different under different circumstances. The effect and stability of metamorphism are yet to be studied.

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