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Niobium-alloying high-chromium cast iron grinding ball and production technology thereof

A high-chromium cast iron and niobium alloying technology, which is applied in the direction of metal processing equipment, process efficiency improvement, casting mold, etc., can solve the problems of poor performance, poor performance uniformity, and low cooling rate, so as to improve the comprehensive performance and structural performance Uniformity, improvement of tissue performance uniformity, and the effect of toughness improvement

Inactive Publication Date: 2015-12-23
HEZE BAIHUI CASTING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them: clay sand casting has lower cost, but coarse structure and poor performance; lost foam casting has high production efficiency and relatively low cost, but due to low cooling rate, coarse structure and poor performance; metal casting has fast cooling speed and low structure. Significant refinement, performance, especially toughness is significantly improved, but there are problems such as large one-time investment, good performance but low efficiency of a single mold, poor structure and performance uniformity of multiple molds, and easy loss of roundness during use.

Method used

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  • Niobium-alloying high-chromium cast iron grinding ball and production technology thereof
  • Niobium-alloying high-chromium cast iron grinding ball and production technology thereof

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Embodiment Construction

[0021] The present invention will be further described below with reference to specific embodiments.

[0022] The niobium alloyed high chromium cast iron grinding ball according to the present invention has a chemical composition of C: 2.5-3.0%, Si: 0.3-0.8%, Mn: 0.6-1.0%, P: <0.1%, S : <0.1%, Cr: 14.0-16.0%, Nb: 0.1-0.2%, RE: 0.1-0.2%; the balance is Fe.

[0023] Carbon: Carbon content is the most significant factor affecting the structure and performance of high chromium cast iron. As the carbon content increases, the wear resistance increases, but the toughness of the alloy decreases. According to the actual wear conditions of the grinding balls, we control the carbon content in the range of 2.5%-3.0% by mass.

[0024] Chromium: It can be seen from the Fe-Cr-C alloy phase diagram that in order to ensure that the carbides are 7 C 3 The chromium content must be greater than 12%. Chromium is the main alloy, in addition to forming carbides with carbon, it is partially dissolved in ...

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Abstract

The invention relates to a niobium-alloying high-chromium cast iron grinding ball and a production technology thereof, and belongs to the field of new materials. The niobium-alloying high-chromium cast iron grinding ball is prepared from, by mass ratio, 2.5% to 3.0% of C, 0.3% to 0.8% of Si, 0.6% to 1.0% of Mn, smaller than 0.1% of P, smaller than 0.1% of S, 14.0% to 16.0% of Cr, 0.1% to 0.2% of Nb, 0.1% to 0.2% of RE and the balance Fe. According to the material performance, the use conditions and the problems of high-chromium white cast iron, a one-mold-multi-piece metal mold local-sand-covering grinding ball production technology is adopted, niobium alloying and rare earth modification are adopted, the structure of the high-chromium white cast iron is refined, the structural performance uniformity of the high-chromium white cast iron is improved, and the overall performance and the structural performance uniformity of the grinding ball are further improved through a semicontinuous decentralized quenching technology. Compared with a common high-chromium white cast iron grinding ball, the niobium-alloying high-chromium white cast iron grinding ball manufactured with the technology has the beneficial effects that the structure is refined, tenacity is greatly improved, and the abrasion resistance is better.

Description

Technical field [0001] The invention relates to a niobium alloyed high chromium cast iron grinding ball and its production process, belonging to the field of new materials. Background technique [0002] The ball mill is widely used in metallurgy, mining, building materials, electric power and chemical industries, but its system is quite severely worn. As the main grinding body of the ball mill, the steel ball accounts for about 85% of the wear-resistant materials. The wear resistance can not only reduce metal consumption and save energy, but also have extremely important significance for improving the production efficiency and product quality of the ball mill. [0003] The wear of the steel ball in the ball mill is a complicated process. In this process, the grinding ball is mainly subjected to abrasive cutting and chiseling, resulting in abrasive wear. In addition, in the process of colliding with abrasives and lining plates, due to insufficient toughness, other failure modes suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C21D5/04C21D1/18B22C9/06
CPCY02P10/20
Inventor 段劲松李振强冯志恩
Owner HEZE BAIHUI CASTING
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