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Method for manufacturing high chromium white wear-resistant cast iron

A wear-resistant cast iron, manufacturing method technology, applied in the direction of manufacturing tools, heat treatment baths, heat treatment equipment, etc., can solve the problems of high price of molybdenum and restrictions on use, and achieve the effects of low cost, high cost performance and mature technology

Inactive Publication Date: 2008-01-16
安徽省安工机械制造有限公司
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Problems solved by technology

However, molybdenum is an expensive metal, especially in recent years, the price of molybdenum has increased, making its use more and more restricted

Method used

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  • Method for manufacturing high chromium white wear-resistant cast iron

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Embodiment Construction

[0024] The present invention has developed a high-chromium white wear-resistant cast iron, its chemical composition (wt%) is: C: 2.6-3.0, Si: ≤ 0.6, Mn: 0.6-0.8, P ≤ 0.07, S ≤ 0.06, Cr: 16-19. Its production process is as follows:

[0025] Qualified molten iron is smelted in the intermediate frequency induction furnace according to the chemical ratio, and 0.5% rare earth silicon alloy of molten iron quality is put into the molten iron ladle. After the casting is solidified, open the box and clean it. Qualified castings are subjected to heat treatment. Heat the casting to 980°C and wait for 1.5 hours in a nitrate bath at 300-400°C. , αk≥8.5J / cm2. Compared with the conventional quenching process, that is, heating at 980°C and tempering at 250°C after air cooling, the hardness of austempering is increased by 10%, the impact toughness is increased by 40%, and the wear resistance is increased by 40%.

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Abstract

The invention discloses a manufacturing method of high chromium white mouth wear resistance cast iron, which adopts a wet casting; pig iron, scrap steel and partial ferroalloy are added in an intermediate frequency induction electric furnace in proportion to smelt qualified liquid iron; and then re modification is carried out; the modified processed liquid iron is cast into a sand mould to be cast and molded; finally isothermal salt bathing heat treatment is carried out. The stiffness, the impacting toughness and the wear resistance of the cast iron manufactured by the method are obviously improved with lower cost , and thus the invention is convenient for the industrial production.

Description

technical field [0001] The invention relates to a method for manufacturing a ferrous metal wear-resistant cast iron material. Background technique [0002] Metal wear-resistant materials are often used to manufacture wear-resistant parts such as liners, grinding balls, tooth plates, blades, bucket teeth, etc. of various ball mills, crushers, mixers, excavators, etc., and are widely used in metallurgy, mining, cement, electric power, Construction and other departments are indispensable engineering materials for modern industry. According to statistics, my country consumes 3 million tons of metal wear-resistant materials every year. Therefore, improving the wear resistance of metal wear-resistant materials and prolonging their service life have significant economic and social benefits. [0003] High chromium white cast iron usually refers to white cast iron with Cr content between 12-28%. As early as the 1930s, people began to study high-chromium white cast iron. In the 1960...

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Application Information

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IPC IPC(8): B22D3/00C22C37/00C21D1/46C21D1/28
Inventor 费昭鹤高甲生
Owner 安徽省安工机械制造有限公司
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