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High-strength wear-resistant solid iron ball and production process thereof

A solid iron ball, production process technology, applied in metal material coating process, manufacturing tools, coating, etc., can solve the problem of poor impact resistance of steel balls, large shape change of steel balls, small depth of hardened layer of steel balls, etc. problems, to achieve the effect of improving the strength of iron balls, strengthening the structure strength and high impact toughness

Inactive Publication Date: 2019-03-26
徐州华腾耐磨材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current production of hot-rolled steel balls generally adopts medium-carbon steel with better plasticity, and then uses quenching and tempering heat treatment processes to increase the strength of steel balls. However, steel balls are affected by tempering brittleness after quenching. As a result, the impact resistance of steel balls deteriorates, and the process is relatively difficult, and this process method is not suitable for the processing of large-diameter steel balls, which will result in a small depth of hardened layer of steel balls, a large difference in hardness between the inner and outer layers, and a decrease in overall strength. The shape of the steel ball varies greatly, but the size is not accurate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] SS01. The raw material of hot-rolled round steel bar made of No. 25 steel is placed in a gas heating furnace and heated to 1180°C, and the furnace temperature is 1050°C;

[0020] SS02. After being released from the furnace, the steel rod enters the skew rolling steel ball rolling mill and is continuously rolled into a spherical shape;

[0021] SS03. The formed iron balls are air-cooled to 840°C during the transportation process, and then enter the salt bath furnace for carbonitriding, and the co-infiltration temperature is 820°C;

[0022] SS04. The iron balls after carbonitriding are directly quenched in hot oil or alkali bath at 110°C for 5 minutes and then taken out for air cooling to obtain finished solid iron balls. The metallographic composition is: C0.33%, N2 , The hardness difference between the carbonitriding layer and the inner layer is 2.7HRC.

Embodiment 2

[0024] SS01. The hot-rolled round steel bar raw material made of No. 25 steel is placed in a gas-fired heating furnace and heated to 1200°C, and the furnace temperature is 1100°C;

[0025] SS02. After being released from the furnace, the steel rod enters the skew rolling steel ball rolling mill and is continuously rolled into a spherical shape;

[0026] SS03. The formed iron balls are air-cooled to 860°C during the transportation process, and then enter the salt bath furnace for carbon and nitrogen co-infiltration, and the co-infiltration temperature is 860 °C;

[0027] SS04. The iron balls after carbonitriding are directly quenched in hot oil or alkali bath at 200°C for 15 minutes, then taken out and air-cooled to obtain finished solid iron balls. The metallographic composition is: C0.40%, N0.04%, Si0 .33%, Mn0.6%, P0.32%, S0.32%, Cr0.15%, Cu0.18%, Ni0.27%, the rest is Fe, the surface hardness is 108HRC, and the impact toughness is 85J / cm 2 , The hardness difference between ...

Embodiment 3

[0029] SS01. The hot-rolled round steel bar raw material made of No. 25 steel is placed in a gas-fired heating furnace and heated to 1220°C, and the furnace temperature is 1150°C;

[0030] SS02. After being released from the furnace, the steel rod enters the skew rolling steel ball rolling mill and is continuously rolled into a spherical shape;

[0031] SS03. The formed iron balls are air-cooled to 850°C during the transportation process, and then enter the salt bath furnace for carbon and nitrogen co-infiltration, and the co-infiltration temperature is 840 °C;

[0032] SS04. The iron balls after carbonitriding are directly quenched in hot oil or alkali bath at 160°C for 10 minutes, then taken out and air-cooled to obtain finished solid iron balls. The metallographic composition is: C0.36%, N2 , The hardness difference between the carbonitriding layer and the inner layer is 2HRC.

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PUM

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Abstract

The invention discloses a high-strength wear-resistant solid iron ball and a production process thereof, and relates to the technical field of machining. The iron ball is composed of the following components in percentage by weight: 0.31%-0.42% of C, less than 0.05% of N, 0.17%-0.37% of Si, 0.5%-0.8% of Mn, less than 0.035% of P, less than 0.035% of S, less than 0.25% of Cr, less than 0.25% of Cu,less than 0.3% of Ni and the balance Fe, wherein the surface hardness of the iron ball is 95-110HRC, and the impact toughness is 65-85J / cm<2>. According to the high-strength wear-resistant solid ironball and the production process thereof, by utilizing the characteristic of no temper brittlement tendency of low-carbon 25 steel, a tempering procedure is avoided in process; through nitrocarburizing and step quenching, an outer layer with higher hardness and wear resistance, of the iron ball, is obtained, and the structure strength of the core part of the iron ball can further be increased, sothat high impact toughness is obtained, and the strength of the iron ball is increased; and moreover, the process is simple, and increasing for automatic rolling is benefited.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a high-strength wear-resistant solid iron ball and a production process of the high-strength wear-resistant solid iron ball. Background technique [0002] At present, the production methods of steel balls generally include forging, rolling, semi-solid forming and casting; Forging and rolling balls account for a large proportion of production methods. Among them, as a brand-new rolling technology, hot-rolled steel ball is a technological breakthrough in the ball grinding steel ball manufacturing industry, and is gradually replacing forged steel balls. Compared with forging and other methods, hot-rolled steel ball technology has the following characteristics : The hot rolling method has high production efficiency, large output, mechanized rolling ball production, high degree of automation, less labor force, small interference from human factors, stable qu...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C23C8/56C21D9/36C21D1/18B21B1/46
CPCB21B1/463B21B2201/06C21D1/18C21D9/36C22C38/001C22C38/002C22C38/02C22C38/04C22C38/42C23C8/56
Inventor 马腾
Owner 徐州华腾耐磨材料有限公司