Micro-alloyed high-strength anti-oxidization iron-nickel alloy gas valve steel material and preparation method

A micro-alloying and high-strength technology, applied in the field of materials, can solve the problems of high Ni content, high cost and short life, and achieve the effects of widening the rolling temperature zone, improving the yield and good plasticity.

Active Publication Date: 2016-05-04
CHONGQING MATERIALS RES INST
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AI Technical Summary

Problems solved by technology

There are mainly two kinds of gas valve steel materials in the prior art. One is nickel-based superalloy, which has excellent comprehensive performance, but due to the high Ni content (usually exceeding 75%), the cost is high; the other is heat-resistant steel, mainly Applied to medium-load valves, its low strength makes it prone to failure and short life. Although surfacing welding can improve the wear resistance and corrosion resistance of the end face of the disc, it is prone to surfacing defects

Method used

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  • Micro-alloyed high-strength anti-oxidization iron-nickel alloy gas valve steel material and preparation method
  • Micro-alloyed high-strength anti-oxidization iron-nickel alloy gas valve steel material and preparation method
  • Micro-alloyed high-strength anti-oxidization iron-nickel alloy gas valve steel material and preparation method

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Embodiment Construction

[0057] According to the proportioning described in table 1, get each component described in the present invention, prepare the material shown in the present invention as follows:

[0058] Table 1 chemical composition list (wt%)

[0059]

[0060]

[0061] Note: The comparative example is Ni30, a commercially available valve steel alloy material.

[0062] 1) Preparation of electrode rod

[0063] Take the above-mentioned components according to the ratio in Table 1, and dry them at 200°C for 4 hours to preheat and dry the water vapor. Ni, Cr, Fe, Nb, Ta, W, C are loaded into the crucible of the furnace as large materials, vacuumed to transmit power, and the power transmission power is slowly increased as the vacuum degree continues to increase. When the vacuum degree is better than 20Pa, the power is increased to 650kw until all the large materials are melted, and then the first refining is carried out, the refining power is 500kw, the refining time is 60min, and the vacu...

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Abstract

The invention relates to a micro-alloyed high-strength anti-oxidization iron-nickel alloy gas valve steel material and a preparation method. The material comprises elements such as Ni, Cr, Ti, Al, Mo, Nb, Mn, C, B, Mg, Ta, Ce, Zr, V, W, N, Fe and the like. The material can be used in a working environment with a high temperature, high load, strong oxidization and strong corrosion, is low in nickel content, has good tensile strength, good endurance strength, good fatigue strength and excellent oxidization resistance, good corrosion resistance and good resistance to fuel gas, and can be used for preparing a gas inlet valve and a gas outlet valve of a medium-high-load engine.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a micro-alloyed high-strength anti-oxidation iron-nickel alloy valve steel material and a preparation method. Background technique [0002] The engine provides powerful power for the operation of the vehicle, and the role of the valve is to input fuel into the engine and discharge exhaust gas. It is the throat of the engine, and its importance is self-evident. The working conditions of the valve are very bad, mainly as follows: first, the valve is directly in contact with high-temperature gas, which is severely heated and difficult to dissipate heat, so the temperature of the valve working environment is very high, usually up to 780-950 ° C; second, the valve Under the action of gas force and valve spring force, and due to the inertial force of the moving parts of the valve mechanism, the valve is impacted when it is seated and performs high-speed reciprocating motion, which is easily re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/06C22C38/44C22C38/48C22C38/04C22C38/54C22C38/46C22C30/00C21D8/00C22C33/04C22F1/00
CPCC21D8/005C22C30/00C22C33/04C22C38/001C22C38/002C22C38/005C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22F1/00
Inventor 莫燕刘海定吴畏王明波王东哲李永友
Owner CHONGQING MATERIALS RES INST
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