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High-carbon equivalent and high-strength gray cast iron and preparation method thereof

A high-carbon equivalent, high-strength technology, applied in the field of high-carbon-equivalent, high-strength gray cast iron, can solve problems such as nitrogen pore defects that are prone to occur, and achieve the effects of reducing the tendency of material shrinkage and porosity, good thermal conductivity, and improving strength

Inactive Publication Date: 2018-11-30
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention improves the mechanical properties of the material by adding N elements, but the addition of nitrogen-fixing elements is limited, which is prone to nitrogen pore defects

Method used

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  • High-carbon equivalent and high-strength gray cast iron and preparation method thereof

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preparation example Construction

[0020] A method for preparing gray cast iron with high carbon equivalent and high strength, comprising the following steps:

[0021] (1) Alloy smelting: use intermediate frequency smelting furnace for smelting, and the furnace materials are pig iron, scrap steel, recycled material, ferromanganese, ferro-niobium, ferrochrome, copper, ferrosulfur, ferromolybdenum, recarburizer, iron nitride alloy, according to the furnace The chemical composition is adjusted according to the test results of the molten iron composition. When the temperature of the molten iron reaches 1470 ° C ~ 1560 ° C, it is allowed to stand for 5 ~ 25 minutes, and then it is taken out of the furnace;

[0022] (2) Inoculation treatment: pour molten iron into the ladle for inoculation treatment, sprinkle slag collecting agent, and pour;

[0023] (3) Pouring: The inoculated molten iron is poured at a temperature of 1360°C to 1440°C, and an inoculant is added to inoculate with the flow while pouring, and the inocu...

Embodiment 1

[0044] A high-carbon equivalent high-strength gray cast iron of the present invention, the composition and weight percentage of the gray cast iron are: C: 3.25%, Si: 1.97%, Nb: 0.08%, N: 0.054%, Mn: 0.84%, P : 0.03%, S: 0.08%, Cu: 0.69%, Cr: 0.32%, Mo: 0.27%, Re: 0.03%, and the balance is Fe and unavoidable impurities.

[0045] The carbon equivalent (CE) in the high-carbon-equivalent high-strength gray cast iron is 3.94%.

[0046] A method for preparing gray cast iron with high carbon equivalent and high strength, comprising the following steps:

[0047] (1) Alloy smelting: use intermediate frequency smelting furnace for smelting, and the furnace materials are pig iron, scrap steel, recycled materials, ferromanganese, ferro-niobium, ferrochrome, copper, iron sulfur, ferromolybdenum, coke, iron nitride alloy, according to the molten iron in the furnace The chemical composition is adjusted according to the composition test results. When the temperature of the molten iron reache...

Embodiment 2

[0055] A high-carbon equivalent high-strength gray cast iron of the present invention, the composition and weight percentage of the gray cast iron are: C: 3.3%, Si: 2.15%, Nb: 0.07%, N: 0.03%, Mn: 0.7%, P : 0.03%, S: 0.03%, Cu: 0.65%, Cr: 0.35%, Mo: 0.24%, Re: 0.025%, and the balance is Fe and unavoidable impurities.

[0056] The carbon equivalent (CE) in the high-carbon-equivalent high-strength gray cast iron is 4.03%.

[0057] A method for preparing gray cast iron with high carbon equivalent and high strength, comprising the following steps:

[0058] (1) Alloy smelting: use intermediate frequency smelting furnace for smelting, and the furnace materials are pig iron, scrap steel, recycled materials, ferromanganese, ferro-niobium, ferrochromium, copper, iron sulfur, ferromolybdenum, anthracite, iron nitride alloy, according to the molten iron in the furnace The chemical composition is adjusted according to the composition test results. When the temperature of the molten iron ...

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Abstract

The invention discloses a high-carbon equivalent and high-strength gray cast iron and a preparation method thereof, and belongs to the field of gray cast iron materials. The high-carbon equivalent andhigh-strength gray cast iron mainly comprises, by weight, 3.1-3.5 % of C, 1.7-2.3% of Si, 0.04-0.2% of Nb, 0.03-0.1% of N, 0.5-1.0% of Mn, 0.03-0.15% of S, 0.06% or less of P, 0.65-0.9% of Cu, 0.31-0.5% of Cr, 0.1-0.4% of Mo, 0.01-0.04% of Re, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: alloy melting, inoculating treatment and casting. Routine chemical elements are optimized, and Nb and N elements are compounded and added, so a technical problem that gray cast iron parts cannot simultaneously meet the requirements of high carbon equivalent, high strength and few casting defects is solved, and the problem of cracking of the high-carbon equivalent gray cast iron parts, caused by low strength, is solved.

Description

technical field [0001] The invention relates to the field of high-carbon equivalent high-strength gray cast iron, in particular to a high-strength gray cast iron used in a cylinder head of a high-horsepower diesel engine. Background technique [0002] At present, in order to improve the strength of gray cast iron materials, technological measures such as reducing carbon equivalent (CE) are usually adopted, but this reduces the filling capacity, thermal conductivity, casting process performance and machining performance of parts, and greatly increases the shrinkage tendency of castings. The waste rate of engine cylinder head products such as leakage, water leakage and cracking caused by shrinkage porosity remains high. Therefore, a gray cast iron material with high carbon equivalent and high strength needs to be developed urgently. [0003] In order to improve the strength of high carbon equivalent gray cast iron, researchers at home and abroad have done a lot of work on all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/08
CPCC22C37/10C22C33/08C22C37/06
Inventor 金通袁福安晏克春霍卯田涂欣达冯世荣王作勇
Owner DONGFENG COMML VEHICLE CO LTD
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