Preparation method of high-hardness strong-toughness high-manganese wear-resisting balls

A technology of wear-resistant balls and strong toughness, applied in the field of wear-resistant balls, can solve the problems of increased production costs, achieve the effects of reducing internal stress, improving toughness, and reducing the number of tempering treatments

Inactive Publication Date: 2018-09-14
NINGGUO ZHENGXING WEAR RESISTANT MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its toughness meets the requirements of grinding balls, multiple tempering results in increased production costs

Method used

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  • Preparation method of high-hardness strong-toughness high-manganese wear-resisting balls
  • Preparation method of high-hardness strong-toughness high-manganese wear-resisting balls

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add steel scrap, ferromanganese, recarburizer, metal aluminum, metal copper, ferromanganese nitride, ferrotungsten, ferrochrome, and ferrovanadium as raw materials into the electric furnace for melting. The melting temperature is 1580 ° C. Take a small amount of molten steel to study its composition Analysis, the mass fraction of elements in molten steel is controlled at: 13.5% Mn, 1.2% C, 2.2% Cr, 0.28% W, 0.40% V, 0.12% Al, 0.08% Cu, 0.65% N, 0.50% Si, 0.03% S, 0.05% P, the balance is Fe and unavoidable impurity elements;

[0018] After all the raw materials are melted, pour 1000kg of molten steel into the ladle, and add 5kg of composite modifier, 30% of Si-Ca alloy, 12% of Al-Sn alloy, 5% of Bi-Sb alloy, The rare element RE is 5.8%, and the rest is iron. When the molten steel is lowered to 1460°C, pour the molten steel in the ladle into the mold for casting. Average 0.8°C / S normalizing and cooling to 300°C to obtain crude wear-resistant balls;

[0019] Put the crud...

Embodiment 2

[0021] Add steel scrap, ferromanganese, recarburizer, metal aluminum, metal copper, ferromanganese nitride, ferrotungsten, ferrochrome, and ferrovanadium as raw materials into the electric furnace for melting. The melting temperature is 1580 ° C. Take a small amount of molten steel to study its composition Analysis, the mass fraction of elements in molten steel is controlled at: 16% Mn, 1.5% C, 2.8% Cr, 0.35% W, 0.52% V, 0.18% Al, 0.12% Cu, 0.70% N, 0.60% Si, 0.04% S, 0.06% P, the balance is Fe and unavoidable impurity elements;

[0022] After all the raw materials are melted, pour 1000kg of molten steel into the ladle, and add 5kg of composite modifier, 45% of Si-Ca alloy, 16% of Al-Sn alloy, 10% of Bi-Sb alloy, The rare element RE is 8.0%, and the rest is iron. When the molten steel is lowered to 1460°C, pour the molten steel in the ladle into the mold for casting. Average 0.8°C / S normalizing and cooling to 300°C to obtain crude wear-resistant balls;

[0023] Put the crude...

Embodiment 3

[0025] Add steel scrap, ferromanganese, recarburizer, metal aluminum, metal copper, ferromanganese nitride, ferrotungsten, ferrochrome, and ferrovanadium as raw materials into the electric furnace for melting. The melting temperature is 1600 ° C. Take a small amount of molten steel to study its composition Analysis, the mass fraction of elements in molten steel is controlled at: 13.5% Mn, 1.2% C, 2.2% Cr, 0.28% W, 0.40% V, 0.12% Al, 0.08% Cu, 0.65% N, 0.50% Si, 0.03% S, 0.05% P, the balance is Fe and unavoidable impurity elements;

[0026] After the raw materials are all melted, pour 1000kg of molten steel into the ladle, and add 30kg of composite modifier, 30% of Si-Ca alloy, 12% of Al-Sn alloy, 5% of Bi-Sb alloy, The rare element RE is 5.8%, and the rest is iron. When the molten steel is lowered to 1460°C, pour the molten steel in the ladle into the mold for casting. Average 0.8°C / S normalizing and cooling to 300°C to obtain crude wear-resistant balls;

[0027] Put the cru...

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Abstract

The invention provides a preparation method of high-hardness strong-toughness high-manganese wear-resisting balls. The preparation method comprises the following steps of (1) putting various types ofscrap steel and metal raw materials into an electric furnace to conduct smelting at the smelting temperature of 1580 DEG C-1600 DEG C; (2) pouring molten steel into a steel ladle after the raw materials are totally molten, adding a compound modifier, injecting the molten steel into a die to conduct casting when the molten steel is cooled to 1460-1480 DEG C and cooling the molten steel to 300-380 DEG C; (3) putting wear-resisting ball crude products obtained intelligent the step (2) into the electric furnace to be heated to 900-920 DEG C and be subjected to ageing treatment for 5-6 h, conducting spray quenching treatment on the wear-resisting balls to cool the wear-resisting balls to 120-150 DEG C, conducting tempering to heat the wear-resisting balls to 280-300 DEG C and then conduct heatpreservation and finally air-cooling the wear-resisting balls to the indoor temperature. Through modification treatment, ageing treatment, spray quenching treatment and one-time tempering destressingtreatment, the wear-resisting balls have the properties of high hardness and high toughness, the tempering frequency is reduced, and the production cost is effectively reduced in industrial production.

Description

technical field [0001] The invention relates to the technical field of wear-resistant balls, in particular to a preparation method of high-hardness, strong-toughness and high-manganese wear-resistant balls. Background technique [0002] The wear-resistant ball is a grinding medium in the ball mill, which is used to crush the materials to be ground in the ball mill. The most wear-resistant balls on the market use chromium as the main alloying element, and various other metal elements are added to obtain high-hardness, high-strength grinding balls after modification and heat treatment. As we all know, the heat-treated grinding balls are modified by adding various rare earth elements, and then through various processes such as quenching and multiple tempering, the martensite in the grinding balls is fully refined, thereby improving the quality of the grinding balls. High hardness and high strength. However, there is a lot of stress inside the quenched cast iron, which has str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/22C22C38/24C22C38/06C22C38/20C22C38/02C22C33/06C21D1/18C21D9/36
CPCC21D1/18C21D9/36C22C33/06C22C38/001C22C38/002C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/38Y02P10/20
Inventor 李根有李骏
Owner NINGGUO ZHENGXING WEAR RESISTANT MATERIALS
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