High-hardenability big-diameter 65MnCr grinding ball and preparation method thereof

A high-hardenability, large-diameter technology, applied in the field of high-hardenability large-diameter 65MnCr grinding balls and their preparation, can solve the problems of inability to meet large-diameter grinding balls, unable to achieve accurate control, and difficult to control and prepare. , to achieve the effect of simple and feasible control of processing technology and heat treatment process, uniform hardness distribution, and excellent wear performance

Inactive Publication Date: 2014-01-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large-diameter grinding balls, there is a non-negligible difference in the cooling rate at different positions, so continuous cooling to the bainite zone and continuous cooling to obtain the cooling rate of the bainite and martensite multiphase structure Cannot achieve accurate control
There are certain differences in hardness and toughness at different positions, and the performance of the grinding ball is unstable. At the same time, the process is complicated and it is not easy to control and prepare
[0004] In the case that the above-mentioned wear-resistant materials and processes cannot meet the performance of large-diameter grinding balls, reasonable composition and process design are required to produce grinding balls with high hardness and toughness.

Method used

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  • High-hardenability big-diameter 65MnCr grinding ball and preparation method thereof
  • High-hardenability big-diameter 65MnCr grinding ball and preparation method thereof
  • High-hardenability big-diameter 65MnCr grinding ball and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0039] According to the chemical composition given in Table 1, the cast billet was rolled into a billet of Ф130 mm by vacuum melting in an electromagnetic induction furnace for subsequent processes.

[0040] Table 1 chemical composition (mass percentage)

[0041]

[0042] The hot rolling process is to heat the billet to 1100°C for 1 hour, and then hot-roll it into a Ф130mm ball on a two-roll hot rolling mill. Due to the small amount of deformation, the requirements for the rolling mill are relatively low, which reduces production costs. After rolling, the ball is ground The temperature is 950°C.

[0043] After the final rolling, the balls are quenched in water for 2.5 minutes, and the temperature of turning red after exiting the water is 130°C, and then they are kept in a 320°C holding furnace for 6 hours, and then cooled out of the furnace. The present invention only adopts a grinding ball with a diameter of Ф130mm as an experiment, and the composition design and process ...

Embodiment 4

[0045] Using the composition design and process steps of Example 1, the only difference is that the balls are quenched in water for 2.5 minutes after the final rolling, and the temperature of reddening after water discharge is 150°C, and then kept in a 400°C holding furnace for 6 hours, and then cooled in the furnace.

[0046] In the present invention, the hardness distribution of the grinding balls of the ingredients of Example 1 tempered at 320°C (Example 1) and 400°C (Example 4) for 6h is shown in Table 2, and the impact toughness performance is shown in Table 3. 1# represents the grinding balls in The performance after tempering at 320°C, 2# represents the performance of the ball after tempering at 400°C. It can be seen that the hardness distribution of the large-diameter grinding ball of the present invention is uniform, and the strength and toughness are well matched.

[0047] Table 2 Hardness distribution of tempered grinding balls at 2320°C and 400°C

[0048]

[00...

Embodiment 5

[0052] Select and prepare the raw material of the embodiment 2 of the large-diameter 65MnCr grinding ball with high hardenability to smelt, cast and hot-roll into a large-diameter round steel billet for subsequent use according to the above-mentioned composition;

[0053] 2) The steel billet is heated at 1050°C, and after soaking for 1 hour, it is rolled on a two-roll rolling mill. According to different rolls, it can be rolled into grinding balls of different diameters. After rolling, the water temperature is 900°C and quenched in water. After 3 minutes, the redness temperature of the balls is 120°C, and then they are kept in a furnace at 350°C for 6 hours, and then taken out for stack cooling to obtain large-diameter 65MnCr balls with high hardenability.

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Abstract

The invention provides a high-hardenability big-diameter 65MnCr grinding ball and a preparation method thereof, which belong to the field of wear-resistant materials. The grinding ball consists of the following components in percentage by weight: 0.55-0.75% of C, 0.1-0.5% of Si, 1.0-3.0% of Mn, 0.5-1.5% of Cr, 0.01-0.1% of Al, less than or equal to 0.1% of P, less than or equal to 0.01% of S, less than or equal to 0.01% of N and the balance of unavoidable impurities. The preparation technology comprises the following steps: heating a steel billet at temperature of 1050-1100 DEG C, preserving heat for 1 hour, soaking, milling the steel billet on a two-roll mill, placing the steel billet in water with temperature of 900-950 DEG C, quenching for 2.5-3 minutes in water, at grinding ball re-reddening temperature of 120-150 DEG C, then preserving heat for 6 hours in a furnace at temperature of 320-400 DEG C, and taking the steel billet out and cooling in heap. After tempering, internal stress is eliminated, impact toughness is enhanced and non-notched impact energy at normal temperature is over 25 J. The production technology is simple and feasible to operate, the produced 65MnCr grinding ball has very good hardenability as well as excellent matching of hardness and toughness, and the production can achieve practical industrial application.

Description

technical field [0001] The technology relates to a large-diameter 65MnCr grinding ball with high hardenability and a preparation method thereof, which mainly involves preparing a large-diameter grinding ball with high hardenability, high hardness and high toughness. technical background [0002] Grinding balls are the wearable parts with the largest consumption in ball mills used to crush ores, coal mines, etc. They are widely used in milling equipment in metallurgy, mining, electric power, building materials and other industrial fields. The annual consumption in my country is more than 1.5 million tons. Improving the service life of wearing parts and reducing production costs have always been valued by research and production departments at home and abroad. In recent years, with the increase of energy costs and the decline of various ore grades, construction investment and production costs are a serious problem faced by mines all over the world. Due to the use of efficient l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21D8/00
Inventor 耿志达赵爱民武会宾程俊业汪小培黄耀张帆唐荻米振莉
Owner UNIV OF SCI & TECH BEIJING
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