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Process method for producing wear-resisting corrosion-resisting high chromium cast iron pieces

A technology of high chromium cast iron and process method, applied in the field of high chromium cast iron smelting, can solve problems such as failure to meet requirements, waste of resources, transformation of internal structure, etc., and achieve stable product performance, good wear resistance, and good corrosion resistance Effect

Inactive Publication Date: 2013-07-10
马鞍山市华威冶金机械有限公司
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Problems solved by technology

Increasing the chromium content can not only improve the wear resistance, but also improve the corrosion resistance of the casting. However, when the chromium content exceeds a certain value, the internal structure will change, which will adversely affect the performance of the casting.
Many manufacturers simply improve the wear resistance of castings by increasing the chromium content, which not only increases the cost, wastes resources, and sometimes fails to meet the requirements, the gain outweighs the gain

Method used

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Examples

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Embodiment Construction

[0007] According to the invented process, a furnace of molten iron was smelted with the composition standard of C 3.0% Si 0.6% Mn 0.5% Cr 23% Cu 0.8% Mo 0.8%, and a rare earth alloy with a weight of 1.2% of the molten iron was added for inoculation treatment, casting 30-50mm thick, High chromium castings weighing 10-40 kg. Heat at 350°C for one and a half hours, at 750°C for two hours, and at 1000°C for four hours, and leave the oven to cool in air. After testing, the surface hardness of the casting is 64HRC, and the impact toughness is 4.2J / cm*cm. In addition, cast the same product with the composition of C 3.0% Si 0.6% Mn 0.5% Cr 28% Cu 0.8% Mo 0.8%, heat it at 750 degrees Celsius for one hour and 1000 degrees Celsius for one and a half hours, and then take it out of the furnace and air cool it. After testing, the surface hardness of the casting is 60HRC, and the impact toughness is 3.0J / cm*cm. The two batches of products are sent to the mixing station for comparison. The s...

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Abstract

The invention provides a process method for producing wear-resisting corrosion-resisting high chromium cast iron pieces. A smelting device and a smelting process are a conventional device and a conventional process. The process method for producing wear-resisting corrosion-resisting high chromium cast iron pieces is characterized in that reasonable internal components are selected, a certain amount of rare earth alloy is added to perform inoculation treatment, and simultaneously appropriate follow-up heat treatment standards and cooling modes are selected. The process method can obtain high chromium cast iron pieces with good wear resistance, corrosion resistance and impact toughness while the high chromium cast iron pieces are reasonable in chromium content, reduces cost, and can stabilize product performance.

Description

1. Technical field [0001] The invention belongs to the high-chromium cast iron smelting technology, and in particular relates to a process for stably producing wear-resistant and corrosion-resistant high-chromium cast iron parts by controlling components and heat treatment conditions. 2. Background technology [0002] The loss of high chromium cast iron in the actual use process is not only wear and tear, but corrosion also accelerates the wear of high chromium cast iron. The performance of high chromium cast iron is affected by the internal composition and subsequent heat treatment, and the subsequent heat treatment is affected by the thickness of the casting, the method of loading, the heating rate and the cooling condition, which makes the performance of high chromium cast iron fluctuate greatly. Increasing the chromium content can not only improve the wear resistance, but also improve the corrosion resistance of the casting. However, when the chromium content exceeds a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00C21D5/00
Inventor 吕丰杰
Owner 马鞍山市华威冶金机械有限公司
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