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A rare earth-doped low-chromium wear-resistant steel ball and its preparation method

A technology of rare earth doping and wear-resistant steel, which is applied in the wear-resistant field to achieve the effect of increasing service life and improving wear-resistant performance

Active Publication Date: 2017-08-11
TONGLING SANSHENG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, wear-resistant parts cannot fully meet the performance requirements. How to improve the wear-resistant performance and service life of wear-resistant parts is a technical problem urgently needed to be solved by those skilled in the art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A rare earth-doped low-chromium wear-resistant steel ball, which contains the following components by mass fraction: C: 2.75%; Cr: 1.2%; Mn: 0.46%; Si: 0.9%; P: 0.12%; S: 0.12 %; Ti: 0.047%; B: 0.005%; RE: 0.12%; Al: 0.04%; the balance is Fe;

[0020] S1: Smelting and casting: use scrap steel, chromium steel, manganese steel, boron steel and silicon steel as raw materials, smelt, put RE-Si-Fe into the ladle, adjust the composition to meet the above range, and cast into the ladle out of the furnace. 1540°C, get castings, air cooling;

[0021] S2: heat treatment: heat the casting obtained in S1 at 630°C for 2.5 hours in a heating furnace, water-cool, put it in a tempering furnace and raise the temperature to 224°C, temper for 7 hours, and cool it out of the furnace to obtain a wear-resistant body;

[0022] S3: surface treatment: the green body obtained in S2 is surface-polished to obtain a finished rare-earth-doped low-chromium wear-resistant steel ball.

Embodiment 2

[0024] A rare earth-doped low-chromium wear-resistant steel ball, which contains the following components by mass fraction: C: 2.8%; Cr: 1.5%; Mn: 0.4%; Si: 1.0%; P: 0.11%; S: 0.11 %; Ti: 0.04%; B: 0.006%; RE: 0.10%; Al: 0.06%; the balance is Fe;

[0025] S1: Smelting and casting: use scrap steel, chromium steel, manganese steel, boron steel and silicon steel as raw materials, smelt, put RE-Si-Fe into the ladle, adjust the composition to meet the above range, and cast into the ladle out of the furnace. 1500°C, get castings, air cooling;

[0026] S2: heat treatment: heat the casting obtained in S1 at 620°C for 3 hours in a heating furnace, water-cool, put it in a tempering furnace and raise the temperature to 220°C, temper for 8 hours, and cool it out of the furnace to obtain a wear-resistant body;

[0027] S3: surface treatment: the green body obtained in S2 is surface-polished to obtain a finished rare-earth-doped low-chromium wear-resistant steel ball.

Embodiment 3

[0029] A rare earth-doped low-chromium wear-resistant steel ball, which contains the following components by mass fraction: C: 2.7%; Cr: 1.0%; Mn: 0.5%; Si: 0.7%; P: 0.13%; S: 0.13 %; Ti: 0.05%; B: 0.003%; RE: 0.13%; Al: 0.02%; the balance is Fe;

[0030] S1: Smelting and casting: use scrap steel, chromium steel, manganese steel, boron steel and silicon steel as raw materials, smelt, put RE-Si-Fe into the ladle, adjust the composition to meet the above range, and cast into the ladle out of the furnace. 1600°C, get castings, air cooling;

[0031] S2: heat treatment: heat the casting obtained in S1 at 620°C for 3 hours in a heating furnace, water-cool, put it in a tempering furnace and raise the temperature to 230°C, temper for 6 hours, and cool it out of the furnace to obtain a wear-resistant body;

[0032] S3: surface treatment: the green body obtained in S2 is surface-polished to obtain a finished rare-earth-doped low-chromium wear-resistant steel ball.

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Abstract

The invention discloses a rare earth-doped low-chromium wearable steel ball which is prepared from the following constituents in percentage by mass: 2.7-2.8% of C, 1.0-1.5% of Cr, 0.4-0.5% of Mn, 0.7-1.0% of Si, 0-0.15% of P, 0-0.15% of S, 0.04-0.05% of Ti, 0.003-0.006% of B, 0.10-0.13% of RE, 0.02-0.06% of Al and the balance of Fe. The preparation process includes the following steps: adopting scrap steel, chrome steel, manganese steel, vanadium steel, boron steel and silicon steel as raw materials for smelting; putting RE, Si and Fe into a pouring ladle with the composition being adjusted to satisfy the mass ratio, and pouring the material, after being taken out of a furnace, into the pouring ladle with an out-furnace temperature of 1500-1600 DEG C to obtain a casting, and then air-cooling the casting; performing heat treatment to obtain a wear-resistant part green body; performing surface treatment to obtain a finished rare earth-doped low-chromium steel ball.

Description

technical field [0001] The invention belongs to the field of wear-resistant technology, and in particular relates to a rare earth-doped low-chromium wear-resistant steel ball and a preparation method thereof. Background technique [0002] Ball mill is one of the high-fine grinding machines widely used in industrial production. Wear-resistant parts are the grinding material medium of ball mill equipment. The friction between wear-resistant parts and between wear-resistant parts and materials produces grinding and peeling. They are important basic parts and are widely used in mines, cement plants and power plants. in the production process. In the prior art, the wear-resistant parts cannot fully meet the performance requirements. How to improve the wear-resistant performance and service life of the wear-resistant parts is a technical problem urgently needed to be solved by those skilled in the art. Contents of the invention [0003] In order to solve the technical problems...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/36C22C33/04
CPCB02C17/20C22C38/005C22C38/02C22C38/04C22C38/06C22C38/14C22C38/18C22C38/32
Inventor 范德林
Owner TONGLING SANSHENG ELECTRONICS