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Air valve steel for internal combustion engine

A technology for valve steel and internal combustion engines, applied in the field of alloys, which can solve the problems of poor high-temperature oxidation and corrosion resistance and wear reduction performance, inability to completely eliminate layered precipitation, and reduced oxidation and corrosion resistance, and achieve good oxidation and corrosion resistance Performance, long service life, effect of suppressing grain growth

Active Publication Date: 2014-03-12
刘睛睛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned austenitic steel cannot completely eliminate the layered precipitation during the application process. The layered precipitation will make the grain boundary and the matrix poor in chromium, resulting in reduced oxidation and corrosion resistance, and corrosion pits on the cone surface and neck of the exhaust valve. , fatigue aging occurs
In addition, the above-mentioned austenitic steels use carbides and nitrogen carbides with large friction coefficients as hard phases, and their high-temperature oxidation and corrosion resistance and wear-reducing properties are poor.

Method used

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preparation example Construction

[0055] The present invention has no special limitation on the preparation method of the gas valve steel of the internal combustion engine, and can be appropriately adjusted on the basis of the existing nickel-based alloy steel gas valve production method, preferably including the following steps:

[0056] Smelting, casting and forging the raw materials meeting the above ratios to obtain ingots;

[0057] After rolling the ingot, a semi-finished product is obtained;

[0058] After the semi-finished product is subjected to stress relief annealing, an internal combustion engine valve steel is obtained.

[0059] In the present invention, elements such as Cr, Ni, Mn, Nb, Mo, Si, C, N, P, Fe can all be raw materials from corresponding pure metals or corresponding intermediate metals, such as Cr, Ni, Mn, Metal elements such as Nb, Mo, Fe are preferably provided by corresponding pure metals, and non-metallic elements such as Si, C, N, P are preferably provided by corresponding interme...

Embodiment 1

[0071] Cr ingots, Ni ingots, Mn ingots, Nb ingots, Mo ingots, Si-Fe master alloys, C-Fe master alloys, N-Fe master alloys, P-Fe master alloys, Fe ingots and an average particle size of 80nm, the maximum Si-B-C-N amorphous particles with a particle size of no more than 100nm were smelted in a vacuum induction furnace according to the following ratios to obtain molten metal: 24wt% Cr; 13wt% Ni; 4.5wt% Mn; 3wt% Nb; 2wt% 0.1wt% of Si; 1.5wt% of Si-B-C-N; 0.1wt% of C; 0.1wt% of N; 0.02wt% of P, the balance of Fe;

[0072] Cast the obtained molten metal to obtain a 600kg ingot. After forging, roll it into a round bar with a diameter of Φ150cm on the 250 and 150 rolling mills, and then perform stress relief annealing at 200°C and hold it for 2 hours to obtain the valve steel;

[0073] Carry out component analysis to described valve steel, its composition is as follows: 24.1wt% Cr; 12.9wt% Ni; 4.5wt% Mn; 3wt% Nb; 2wt% Mo; 0.1wt% Si; 1.5wt% % of Si-B-C-N; 0.1wt% of C; 0.1wt% of N; 0.02w...

Embodiment 2

[0077] Cr ingots, Ni ingots, Mn ingots, Nb ingots, Mo ingots, Si-Fe master alloys, C-Fe master alloys, N-Fe master alloys, P-Fe master alloys, Fe ingots and an average particle size of 60nm, the maximum Si-B-C-N amorphous particles with a particle size not exceeding 90nm were smelted in a vacuum induction furnace according to the following proportions to obtain molten metal: 23wt% Cr; 14wt% Ni; 2.5wt% Mn; 2.5wt% Nb; 1.7 0.15wt% of Si; 1.8wt% of Si-B-C-N; 0.06wt% of C; 0.07wt% of N; 0.015wt% of P, 0.015wt% of S and the rest of Fe;

[0078] Cast the obtained molten metal to obtain a 600kg ingot. After forging, roll it into a round bar with a diameter of Φ150cm on the 250 and 150 rolling mills, and then perform stress-relief annealing at 200°C and keep it warm for 1.5h to obtain the valve steel;

[0079] The composition analysis of the valve steel shows that the composition is as follows: 22.7wt% Cr; 14.1wt% Ni; 2.6wt% Mn; 2.5wt% Nb; 1.7wt% Mo; 0.15wt% Si; 1.8wt% of Si-B-C-N; 0....

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Abstract

The invention provides an air valve steel for an internal combustion engine. The air valve steel comprises the following components in percentage by weight: 22-24 percent of Cr, 13-15 percent of Ni, 3.5-4.5 percetn of Mn, 2-3 percent of Nb, 1.5-2 percent of Mo, 0.1-0.2 percent of Si, 1.5-2 percent of Si-B-C-N, 0-0.1 percent of C, 0-0.1 percent of N, 0-0.02 percent of P, 0-0.02 percent of S and the balance of Fe. The air valve steel for the internal combustion engine provided by the invention is austenitic steel into which 1.5-2 percent by weight of Si-B-C-N is added, so that the high-temperature strength, oxidation resistance, corrosion resistance and abrasion resistance of the austenitic steel can be enhanced by using the Si-B-C-N, and the austenitic steel can reach the using performance of a high-load air valve of an internal combustion engine.

Description

technical field [0001] The invention belongs to the field of alloy technology, and in particular relates to an internal combustion engine valve steel. Background technique [0002] Intake valves and outlet valves are necessary and key components of internal combustion engines such as gasoline engines and diesel engines. Since the operating speed of the internal combustion engine is between 1000 rpm and 6000 rpm, and the operating temperature is as high as 780 ° C to 950 ° C, the air valve usually reciprocates at a high frequency, and the air valve will have an impact on the valve seat, that is, the seating force, resulting in The air valve produces friction and wear and the force on the disc and neck of the air valve. Air valve materials need to have good oxidation and corrosion resistance, wear resistance and wear reduction properties and high temperature strength to be able to work in harsh environments for a long time, so that the internal combustion engine has a longer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C30/00F01L3/02
Inventor 赵勇华云峰周琳刘存波樊新宇田从丰
Owner 刘睛睛
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