A kind of austeric ductile iron grinding ball

Abstract

The invention discloses an Ausferrite ductile cast iron grinding ball, and relates to a spherulitic graphite-contained cast iron alloy. The Ausferrite ductile cast iron grinding ball comprises the following chemical elements in percentage by mass: 3.3-3.7% of C, 2.0-3.0% of Si, 1.0-2.5% of Mn, 0.7-3.0% of Cr, 0.1-1.0% of Mo, 0.1-1.0% of Cu, 0.04-0.08% of P, 0.01-0.020% of S, 0.03-0.05% of Mg, 0.02-0.04% of Ce, 0.03-0.07% of B, 0.06-0.12% of Ti, 0.03-0.2% of V, and the balance of Fe. The Ausferrite ductile cast iron grinding ball is prepared by the steps of preparation and smelting of raw materials, spheroidizing treatment, inoculation treatment and microalloying treatment, and isothermal quenching heat treatment. The Ausferrite ductile cast iron grinding ball overcomes the defects of low production efficiency and high consumption of electric energy of a ball mill due to easy surface stripping and crushing and shorter fatigue life of an existing grinding ball product in the service process.

Description

technical field [0001] The technical scheme of the invention relates to a cast iron alloy containing nodular graphite, in particular to an ausferic nodular cast iron grinding ball. Background technique [0002] In the powder grinding process of metallurgy, mining, cement and thermal power generation and other industrial fields, the wear and energy consumption of wear-resistant materials account for a considerable proportion of economic costs. Improving the wear resistance of materials and reducing energy consumption is an important issue in my country's grinding industry to reduce costs, improve benefits, and achieve sustainable development. [0003] At present, the wear-resistant materials used for grinding balls at home and abroad mainly include low-chromium white cast iron (1-3% Cr), high-chromium cast iron (10-28% Cr) and forged alloy steel. These materials have some insurmountable shortcomings, such as low chromium white cast iron grinding balls have low toughness, eas...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide an ausferitic ductile iron grinding ball, by adding Mo and Cu elements with high hardenability, reducing the manganese content, and performing spheroidizing treatment, inoculation treatment and microalloying treatment, and then use the sand-covered metal mold or metal mold casting process to form 10-30% carbides and fine graphite balls in the as-cast structure of the ball, and then undergo austempering heat treatment to obtain an austeric matrix with excellent comprehensive mechanical properties. And a certain amount of carbides and graphite balls are distributed in the ausferrite matrix, which overcomes the difficulty in controlling the process parameters in the existing grinding ball manufacturing technology, the solid mold casting grinding balls are prone to produce black slag, the vacuum dry sand is compact, The cooling speed is slow, the grinding balls with a diameter of more than 100 mm cannot be quenched through, and the white and bright areas are prone to appear in the grinding ball structure, resulting in the existing grinding ball products having a surface that is easy to peel off and break during service and the fatigue life of the grinding ball is low, resulting in the production of ball mills. The defects of low efficiency and large power consumption

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