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Technique for oil quenching casting sphere made from high chrome alloy

A technology of high chromium alloy and casting balls, which is applied in the direction of quenching agent, manufacturing tools, heat treatment equipment, etc., can solve the problems of easy occurrence of out-of-roundness, spalling, restriction of wear resistance and service life, etc., to achieve extended service life and wear resistance Improved corrosion resistance and multiple economic benefits

Inactive Publication Date: 2010-02-17
ANHUI FENGXING WEAR RESISTANT MATERIALS CO LTD
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AI Technical Summary

Problems solved by technology

However, the production efficiency of air quenching is low, and the products have impermeable quenching, uneven hardness, and easy occurrence of out-of-round, peeling, and broken phenomena during use.
At the same time, limited by the supercooling degree of the air quenching process, the quenching average hardness of high chromium alloy wear-resistant casting balls is difficult to reach 60HRc, which restricts the further improvement of its wear resistance and service life
For this reason, the wear-resistant material industry at home and abroad has been actively seeking a new quenching process to improve the strength, toughness and wear-resistant and corrosion-resistant capabilities of high-chromium alloy wear-resistant casting balls, but there has been no fundamental breakthrough so far.

Method used

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  • Technique for oil quenching casting sphere made from high chrome alloy

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Embodiment Construction

[0017] The invention mainly relates to the quenching treatment of φ6.5-φ130 high chromium alloy wear-resistant cast balls or cast segments in oil medium. Its implementation process is as follows:

[0018] 1. High chromium alloy wear-resistant cast balls or cast segments are heated to the quenching temperature (920-1150°C) in a push rod type continuous heating furnace, placed on the movable quenching cradle 1 after being released from the furnace (see the attached figure), and made to Spread evenly.

[0019] 2. Start the cradle control mechanism to make the quenching cradle move back and forth up and down, so as to ensure that the high chromium alloy wear-resistant casting balls or casting segments can roll freely on it.

[0020] 3. Immerse the movable quenching cradle in the oil pool 2 (see attached picture) to carry out oil cooling and quenching treatment on the high chromium alloy wear-resistant casting ball or casting segment. The quenching medium is No. 10 or No. 20 mecha...

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Abstract

This invention relates to an art for oil-quenching high-chromium alloy cast ball. The high-chromium alloy cast ball and cast-section are heated to quenching temp., then tapped out of the furnace, proceeding oil-quenching, oil temp. being controlled <120 deg.C, when temp. of the product being lowered below 300 deg.C, the cast ball and cast section are taking out of the oil-cell. The wear-resistinghigh-chromium cast ball and cast section treated by using this method are better than that of prior art treatment in various kinds of technical index, wherein: quenching hardness=60-65 deg.C, difference (between center and surface) of hardness <2.0 RHc, ball falling test >3000 times. This quenching art overcomes prior art defect. The product treated by this method has excellent wear-resisting property and longer service-life.

Description

technical field [0001] The invention relates to a heat treatment process for alloy steel and alloy cast iron quenching, in particular to an oil quenching process for high chromium alloy casting balls or casting segments. Background technique [0002] Alloy wear-resistant casting ball or casting segment is a kind of grinding medium widely used in powder engineering in building materials, mining, chemical industry, thermal power and other industries, and is mass-produced by casting. In order to make alloy wear-resistant cast balls or cast segments have excellent comprehensive mechanical properties such as hardness, toughness, wear resistance, and corrosion resistance, selecting a suitable heat treatment method is a key process for quality control of wear-resistant cast balls or cast segments. [0003] At present, the wear-resistant cast balls or cast segments of high-chromium alloys in the wear-resistant materials industry at home and abroad basically adopt air-cooled quenchin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D1/58C21D5/00
Inventor 陈宗明赵金华沈茂林汪国清
Owner ANHUI FENGXING WEAR RESISTANT MATERIALS CO LTD
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