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High-strength and high-hardness gray cast iron material and method for casting same into casting

A casting, high-hardness technology, applied in the field of casting, can solve the problems of inability to cast strength, hardness requirements, increase the difficulty of chemical composition, weaken the magnetic field of the intermediate frequency furnace, etc. Effect

Active Publication Date: 2013-05-22
宁国科博尔智能机床有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent shape of pig iron causes the gap between the pig iron put into the intermediate frequency furnace to be too large, weakening the magnetic field of the intermediate frequency furnace, and the chemical composition of different batches of pig iron is different, which increases the difficulty of adjusting the chemical composition during the smelting process
At the same time, the price of pig iron is higher, which increases the production cost
Although the use of iron filings produced by machining to produce castings can reduce the difficulty of adjusting the chemical composition during the smelting process and reduce production costs, but due to the characteristics of iron filings, it is still impossible to cast castings that require high strength and hardness.

Method used

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  • High-strength and high-hardness gray cast iron material and method for casting same into casting
  • High-strength and high-hardness gray cast iron material and method for casting same into casting
  • High-strength and high-hardness gray cast iron material and method for casting same into casting

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Effect test

Embodiment 1

[0032] The method for casting castings of the high-strength and high-hardness gray cast iron material of embodiment 1 may further comprise the steps:

[0033] 1) The raw materials are weighed and proportioned. The composition of each raw material includes: scrap steel 60wt%, iron filings 20wt%, returned iron 15.95wt%, recarburizer 1.5wt%, ferromanganese 0.6wt%, silicon 1.00wt% iron, 0.5wt% copper alloy, 0.05wt% tin, and 0.4wt% silicon-barium inoculant, wherein the mass percentage of silicon in the silicon-barium inoculant is 72%.

[0034] 2) Preheat the induction furnace (preferably 500kg) of the acid intermediate frequency furnace, and add the carburant after heating up to 200-300 degrees. When the carburizer becomes liquid, continue to heat up to 1250-1300 degrees.

[0035] 3) Add about 1 / 3 of the weight of steel scrap in the batching, add about 1 / 3 of the weight of iron filings in the batching after melting, add about 1 / 3 of the weight of returned iron in the batching after...

Embodiment 2

[0041] A high-strength and high-hardness gray cast iron material, its composition content includes (weight percentage): carbon 3.20%; silicon 1.45%; manganese 0.95%; phosphorus 0.04%; sulfur 0.079%; chromium 0.03% and iron.

[0042] The high-strength and high-hardness gray cast iron material of Example 2 was obtained by the same method as that of Example 1. The difference is that the proportions of main furnace materials such as scrap steel, iron filings, and returned iron and auxiliary raw materials are appropriately adjusted. The weight percentages of each raw material are: scrap steel is 64.785wt%, iron filings is 20wt%, and returned iron is 10wt%. Carbon agent is 2wt%, ferromanganese is 0.9wt%, ferrosilicon is 1.25wt%, copper alloy is 0.55wt%, tin is 0.065wt%, silicon barium inoculant is 0.45wt%.

Embodiment 3

[0044] A high-strength and high-hardness gray cast iron material, its composition content includes (weight percentage): carbon 3.10%; silicon 1.60%; manganese 0.85%; phosphorus 0.07%; sulfur 0.06%; chromium 0.05% and iron.

[0045]The high-strength and high-hardness gray cast iron material of Example 3 was obtained by the same method as that of Example 1. The difference is to properly adjust the proportions of steel scrap, iron filings, returned furnace iron and other main furnace materials and auxiliary raw materials. The weight percentages of each raw material are: scrap steel is 60wt%, iron filings is 25wt%, and returned furnace iron is 10.69wt%. The carbon agent is 1.6wt%, the ferromanganese is 0.7wt%, the ferrosilicon is 1.1wt%, the copper alloy is 0.45wt%, the tin is 0.06wt%, and the silicon barium inoculant is 0.4wt%.

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Abstract

The invention discloses a high-strength and high-hardness gray cast iron material and a method for casting the same into a casting. The gray cast iron material comprises the following components in percentage by weight: 3.00-3.20% of carbon, 1.45-1.80% of silicon, 0.75-0.95% of manganese, less than 0.1% of phosphorus, less than 0.08% of sulfur, less than 0.08% of chromium and iron. The gray cast iron material can further contain copper and tin. According to the method for casting the material into a casting, scrap steel, iron chips and returning iron are used as main furnace materials, and carburizing agent, silicon iron and manganese iron are used as auxiliary materials. The gray cast iron material obtained by the invention is small and dispersed in graphite in the tissue, fine in crystal grains, high in pearlite content, short in interlamellar spacing, high in strength, favorable in stability and low in effective cost.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a high-strength and high-hardness gray cast iron material and a casting method thereof. Background technique [0002] When producing and processing castings, pig iron and a small amount of returned materials are mostly used. Put the pig iron and the returned material into the intermediate frequency furnace for smelting, then pour the smelted liquid iron into the sand mold, and after cooling, get the rough casting of the parts to be processed. However, the inherent shape of pig iron causes the gap between the pig irons put into the intermediate frequency furnace to be too large, weakening the magnetic field of the intermediate frequency furnace, and the chemical composition of different batches of pig iron is different, which increases the difficulty of adjusting the chemical composition during the smelting process. At the same time, the price of pig iron is higher, which increases...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08B22D1/00C21C1/08
Inventor 陈立国
Owner 宁国科博尔智能机床有限公司
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