Large-diameter forged wear-resisting steel ball special for mine and preparation method thereof

A large-diameter, wear-resistant steel technology, applied in the field of wear-resistant materials, can solve the problems of large-diameter high-chromium casting balls, such as large crushability, poor wear resistance, high toughness, etc., to improve the internal structure, improve hardenability and The effect of hardenability and high hardness

Active Publication Date: 2018-02-27
TONGLING MINGCHENG FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the material of large-diameter grinding balls used in mines is mainly carbon steel. Its performance is high toughness and low hardness, and its volume hardness generally does not exceed 40H RC. In actual use, there is a common problem of poor wear resistance. Poor and easily deformed
Similarly, for large-size grinding balls, especially those with a diameter greater than 110mm, due to the influence of electrochemical corrosion in mine wet grinding, large-diameter high-chromium cast balls have relatively large crushing defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention proposes a special large-diameter forged wear-resistant steel ball for mines, whose chemical composition includes: C 0.8%, Si 0.9%, Mn 1.2%, Cr 1.5%, Mo 0.1%, V 0.15%, Ti 0.1%, Al 0.15%, Cu0.05%, Zr 0.15%, Hf 0.05%, B 0.2%, P 0.02%, S 0.01%, and the rest are Fe and unavoidable impurities.

[0018] The present invention also proposes a method for preparing the above-mentioned large-diameter forged wear-resistant steel balls for mines, which includes the following steps:

[0019] S1. Melting: Add pig iron, scrap steel, ferromanganese, ferrosilicon, ferrochrome, ferromolybdenum, ferrovanadium, ferrotitanium, ferrozirconium, ferrohafnium, aluminum ingots, copper blocks, and ferroboron into the vacuum induction melting furnace, and heat up To 1530°C, adjust the composition of various elements in the steel, remove slag, cast and form, and get castings;

[0020] S2. Forging: heating the casting to 1080°C, keeping it warm for 1 hour, and rolling to obtain...

Embodiment 2

[0023] The present invention proposes a special large-diameter forged wear-resistant steel ball for mines, whose chemical composition includes: C 1.05%, Si 0.88%, Mn 1.3%, Cr 1.3%, Mo 0.2%, V 0.10%, Ti 0.12%, Al 0.13%, Cu 0.05%, Zr 0.10%, Hf 0.08%, B 0.2%, P 0.015%, S 0.007%, and the rest are Fe and unavoidable impurities.

[0024] The present invention also proposes a method for preparing the above-mentioned large-diameter forged wear-resistant steel balls for mines, which includes the following steps:

[0025] S1. Melting: Add pig iron, scrap steel, ferromanganese, ferrosilicon, ferrochrome, ferromolybdenum, ferrovanadium, ferrotitanium, ferrozirconium, ferrohafnium, aluminum ingots, copper blocks, and ferroboron into the vacuum induction melting furnace, and heat up To 1530°C, adjust the composition of each element in the steel, remove the slag, pour into molding, the pouring temperature is 1450°C, and the casting is obtained;

[0026] S2. Forging: heat the casting to 1080...

Embodiment 3

[0029] The present invention proposes a mine-specific large-diameter forged wear-resistant steel ball, whose chemical composition includes: C 1.12%, Si 0.84%, Mn 1.35%, Cr 1.28%, Mo 0.26%, V 0.08%, Ti 0.15%, Al 0.13%, Cu 0.08%, Zr 0.07%, Hf 0.1%, B 0.18%, P 0.01%, S 0.005%, and the rest are Fe and unavoidable impurities.

[0030] The present invention also proposes a method for preparing the above-mentioned large-diameter forged wear-resistant steel balls for mines, which includes the following steps:

[0031] S1. Melting: Add pig iron, scrap steel, ferromanganese, ferrosilicon, ferrochrome, ferromolybdenum, ferrovanadium, ferrotitanium, ferrozirconium, ferrohafnium, aluminum ingots, copper blocks, and ferroboron into the vacuum induction melting furnace, and heat up To 1540°C, adjust the composition of each element in the steel, remove the slag, pour into molding, the pouring temperature is 1460°C, and the casting is obtained;

[0032] S2. Forging: Heat the casting to 1090°C...

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Abstract

The invention discloses a large-diameter forged wear-resisting steel ball special for a mine and a preparation method thereof and relates to the technical field of wear-resisting materials. The chemical components of the large-diameter forged wear-resisting steel ball special for the mine comprise, by weight, 0.8-1.2% of C, 0.6-0.9% of Si, 1.2-1.5% of Mn, 1.0-1.5% of Cr, 0.1-0.3% of Mo, 0.05-0.15%of V, 0.1-0.2% of Ti, 0.05-0.15% of Al, 0.05-0.15% of Cu, 0.05-0.15% of Zr, 0.05-0.15% of Hf, 0.08-0.2% of B, 0-0.02% of P, 0-0.01% of S, and the balance Fe and inevitable impurities. The preparationmethod comprises the steps of smelting, forging and heat treatment. The chemical components and contents thereof of the large-diameter forged wear-resisting steel ball special for the mine are reasonably optimized, stability of the undercooled austenite and hardenability of steel can be improved through the added hardening elements like Mn, Mo, Cr, V, Ti and Cu, the difference value of the core portion hardness and the surface hardness of the large-diameter wear-resisting steel ball is reduced, the prepared wear-resisting steel ball is smooth and defect-free in surface, high in hardness, goodin toughness and not prone to being broken, the performance of the prepared wear-resisting steel ball can be comparable with high-chromium grinding balls, the prepared wear-resisting steel ball can replace casting balls to be used for ore wet grinding, and the ore grinding efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of wear-resistant materials, in particular to a mine-specific large-diameter forged wear-resistant steel ball and a preparation method thereof. Background technique [0002] Ball mills both at home and abroad tend to be large-scale, especially large-scale semi-autogenous mills with a diameter of more than 10m, which put forward higher requirements for the hardness and size of the balls. At present, the material of large-diameter grinding balls used in mines is mainly carbon steel. Its performance is high toughness and low hardness, and its volume hardness generally does not exceed 40H RC. In actual use, there is a common problem of poor wear resistance. Poor and easily deformed. Similarly, for large-size grinding balls, especially those with a diameter greater than 110mm, due to the influence of electrochemical corrosion in mine wet grinding, large-diameter high-chromium cast balls have relatively large cru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28C22C38/06C22C38/20C22C38/32C21D9/36C21D1/18
CPCC21D1/18C21D9/36C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/28C22C38/32
Inventor 张蔓青肖颖
Owner TONGLING MINGCHENG FOUNDRY
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