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Low-chromium alloy cast iron and preparation method thereof

A chromium alloy and cast iron technology, applied in the field of low-chromium alloy cast iron and its preparation, can solve the problems of poor impact toughness, poor wear resistance, and high raw material cost, and achieve the effects of reducing cost, excellent mechanical properties, and reducing preparation cost.

Inactive Publication Date: 2017-01-04
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only makes the cost of raw materials higher, but also in the smelting process in the prior art, the temperature and time of heat treatment are not properly controlled, resulting in poor quality of the obtained products, such as low hardness, poor impact toughness, and poor wear resistance

Method used

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  • Low-chromium alloy cast iron and preparation method thereof
  • Low-chromium alloy cast iron and preparation method thereof
  • Low-chromium alloy cast iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put steel scrap into a medium-frequency induction furnace with a capacity of 1 ton, and add carburizer to it to melt into molten iron. The amount of carburizer and scrap steel added is controlled before pouring. The chemical composition of molten iron is calculated as C: 2.6 in mass percentage ~3.2%, Si: 0.8~1.2%, Mn≤0.6%, S≤0.1%, P≤0.1%, Cr: 2.0~2.5%, the balance is iron and unavoidable impurities; adjust the temperature of molten iron to 1500℃ , after inoculation, spheroidization, pouring, and then heat treatment. The above-mentioned recarburizer is artificial graphite with C>98%, S≤0.05%, and particle size 0.2-1 mm. Heat treatment is at 650°C for 4 hours, then furnace cooling or air cooling to room temperature. In the above inoculation treatment, the composition of the molten iron is qualified, and the inoculant is added after reaching the tapping temperature, and the steel is poured after being kept for 3-5 minutes. For the above-mentioned spheroidizing treatment,...

Embodiment 2

[0027] On the basis of Example 1, the steel scrap is A3 steel, the corrosion of which is relatively slight. In some other embodiments, the steel scrap can also be 45# steel or a mixture of 45# steel and A3 steel in any mass ratio.

Embodiment 3

[0029] On the basis of Example 1, the order of adding steel scrap and recarburizer is steel scrap, recarburizer, steel scrap, recarburizer, scrap steel, recarburizer, scrap steel, recarburizer, furnace charge, silicon-manganese alloy, and then After it is kept warm for 3-5 minutes, it is tapped and poured.

[0030] Test column:

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Abstract

The invention relates to the technical field of low-chromium alloy, in particular to low-chromium alloy cast iron and a preparation method thereof. By adopting waste steel as raw materials, adding a carburant in the smelting process, controlling chemical components of molten iron, conducting breeding and spheroidizing treatment before tapping casting and controlling the casting temperature, the obtained product achieves excellent mechanical properties such as the anti-impact toughness, the hardness and the metallographic structure, and the preparation cost of the low-chromium alloy cast iron is reduced.

Description

technical field [0001] The invention relates to the technical field of low-chromium alloys, in particular to a low-chromium alloy cast iron and a preparation method thereof. Background technique [0002] Chromium alloy cast iron is a kind of grinding medium widely used in cement, thermal power, magnetic powder, ore dressing and other powder engineering. Enterprises and scientific research units are constantly exploring and developing new processes, so choosing a suitable heat treatment process is the key to improving chromium alloy cast iron. [0003] At present, there are three types of chromium alloy cast iron produced at home and abroad: high chromium alloy cast iron, medium chromium alloy cast iron, and low chromium alloy cast iron. However, whether it is high-chromium alloy cast iron, medium-chromium alloy cast iron or low-chromium alloy cast iron, most of them use pig iron and scrap steel as raw materials in the smelting process, and are smelted in an intermediate fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/10
CPCC22C37/10C22C33/10C22C37/06
Inventor 左进王林敖常友
Owner GUIZHOU KAILIN GRP CO LTD
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