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Low-ally CADI wear-resisting material and preparing method thereof

A technology for austempering ductile iron and wear-resistant materials, applied in the field of metal materials, can solve the problems of inability to meet the CADI performance requirements of austenitic ductile iron, poor carbide morphology, and many trace elements, and achieve moderate hardness and impact toughness. , the effect of improving mechanical properties and reducing casting costs

Active Publication Date: 2019-06-07
FIRST TRACTOR
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the carbide formed by manganese is not good in shape, poor in impact toughness, and easy to crack, so it is not suitable for use in engineering parts
[0006] 2. The use of high-purity pig iron raw materials can meet the CADI performance requirements of ausferrite ductile iron with carbides, but the cost is too high. The cost of ordinary ductile iron pig iron raw materials is low. Due to many trace elements, high sulfur and phosphorus, it cannot meet the requirements The performance requirements of ausferitic ductile iron CADI with carbides, so the raw materials used in the prior art cannot prepare cost-effective low alloy ausferitic ductile iron CADI materials with carbides
[0007] 3. There are very few austenitic ductile iron CADIs with carbides used in engineering parts, which are produced by ordinary pig iron, and S and P have poor high impact toughness.

Method used

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  • Low-ally CADI wear-resisting material and preparing method thereof

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preparation example Construction

[0044] The preparation method of the low-alloy ausferrite ductile iron CADI wear-resistant material wear-resistant parts with carbides, the specific steps are as follows:

[0045] 1. Ingredients and smelting;

[0046] a. The types and weight ratios of ingredients are as follows: carburizer 2.6-3.0%, the carbon content of the carburizer is not less than 95%; scrap steel 60-65%, the scrap steel is scrap carbon steel and its edges and corners, Carbon in scrap steel is 0.2-0.5%; pig iron (Q10 or Q12) 10-15%; ausferitic ductile iron CADI return charge with carbides 20-26.6%, ferromanganese and ferrochrome are determined according to other charge components; adding method The method is as follows: first add steel scrap, recarburizer, ausferrite ductile iron CADI return material with carbides, pig iron Q10 and ferrochrome alloy to the electric furnace first, add recarburizer to the bottom of the furnace first, and press it with scrap steel. Ferromanganese and ferrosilicon are added ...

Embodiment 1

[0069] Chemical composition of wear parts (by weight): carbon (C) 3.40%, silicon (Si) 2.40%, manganese (Mn) 0.40%, sulfur (S) 0.012%, phosphorus (P) 0.035%, chromium (Cr) 0.30%, the balance is iron (Fe).

[0070] Castings with the above components are melted using the following raw materials and proportions: 10.0% pig iron (Q10), 26.6% ausferitic ductile iron CADI with carbides, 60.0% scrap carbon steel (Q235), and ferrosilicon (FeSi75) 0.5%, ferrochrome (FeCr55) 0.3%, recarburizer (C) 2.6%, ferromanganese (FeMn65) 0.0%. According to the above ratio, the raw materials are put into the electric furnace, and the castings are prepared according to the following melting process.

[0071] Casting isothermal quenching process: solution temperature: 900°C, solution time: 90 minutes (min), isothermal quenching temperature: 270°C, quenching time: 60 minutes;

[0072] The rest of the preparation process is the same as the aforementioned process steps. The finished product number is 1...

Embodiment 2

[0074] Chemical composition of wear parts (by weight): carbon (C) 3.70%, silicon (Si) 2.40%, manganese (Mn) 0.60%, sulfur (S) 0.012%, phosphorus (P) 0.04%, chromium (Cr) 0.60%, the balance is iron (Fe).

[0075] The castings with the above components are melted, and the following raw materials and proportions are used: pig iron (Q10) 15.0%, ausferitic ductile iron CADI return material with carbides 20.0%, carbon scrap steel (Q235) 60%, and recarburizer 3.0% , ferrosilicon (FeSi75) 0.8%, ferrochromium (FeCr55) 0.8%, ferromanganese (FeMn65) 0.4%. According to the above ratio, the raw materials are put into the electric furnace, and the castings are prepared according to the following melting process.

[0076] Casting isothermal quenching process: solution temperature: 910°C, solution time: 90 minutes (min); isothermal quenching temperature: 270°C, quenching time: 90 minutes (min);

[0077] The rest of the preparation process is the same as the aforementioned process steps, and...

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Abstract

The invention discloses a low-ally CADI wear-resisting material and a preparing method thereof. A chemical component formula, a spheroidizing method and an inoculation process are adopted, good spheroidal graphite and carbide quantity can be obtained in the low-ally CADI material, hardness and impact toughness after casting heat treatment can be improved, the excellent wear-resisting part can be produced, through increasing of the carbon equivalent of the molten iron, the graphite expansion effect in solidification can be improved, the shrinkage tendency of the part can be reduced, and the problem that agricultural implement castings commonly have the poor compactness can be solved; the low sulfur phosphorus content exists, the mechanical property and the impact property of the material and the wear-resisting part can be improved, the stack molding process is adopted, the casting cost of the low-ally CADI material and the wear-resisting part is further reduced, the content of sulfur and phosphorus in the molten iron can be reduced, the spheroidizing process is optimized, the impact toughness of the casting can be improved, the isothermal quenching heat treatment process parametersare adopted, and the whole wear-resisting part with the proper hardness and impact toughness can be obtained.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a low-alloy austempering ductile iron CADI wear-resistant material and a preparation method thereof. Background technique [0002] As we all know, austempered ductile iron ADI has 1000-1600MPa strength, high impact toughness and excellent wear resistance due to its structure of high carbon austenite, spheroidal graphite and acicular ferrite, and is mostly used in railway parts and construction machinery Wear parts such as middle bucket teeth and crankshaft. Austeric ductile iron with more carbides (hereinafter referred to as CADI) can further improve the wear resistance of ADI materials. The method of realization is to add an appropriate amount of elements that promote carbide formation to ordinary ductile iron to form dispersed carbide hard phase, and then obtained ductile iron containing acicular ferrite, spheroidal graphite, high-carbon austenite and a certain content (5-35%) of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/06C22C37/10C22C33/08C21C1/10C21D5/00C21D1/20
CPCY02P10/20
Inventor 程俊伟邵星海王明海郭亚辉许海峰郭丹丹范随长吕乐华冯志明
Owner FIRST TRACTOR
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