Nickel-based air valve alloy and preparation method thereof
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An alloy and gas valve technology, applied in the field of nickel-based gas valve alloy and its preparation, can solve the problem that the material cannot meet the needs, etc., and achieve the effects of improving the resistance to intergranular corrosion, improving the thermoplasticity, and improving the long-term use performance at high temperature.
Active Publication Date: 2015-06-10
JIANGSU SHENYUAN SPECIAL STEEL +1
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Problems solved by technology
[0008] The purpose of the present invention is to provide a novel nickel-based gas valve alloy to obtain a gas valve with excellent comprehensive performance, meet the requirements of the working conditions of advanced engines (internal combustion engines), and solve the problem that the materials of the prior art cannot meet the needs
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Embodiment 1
[0028] Example 1, a nickel-based gas valve alloy, the chemical composition is based on weight percentage, containing Ni: 55%, Cr: 20%, C: 0.03%, Al: 1.9%, Ti: 2.4%, W: 1.2%, Nb : 1.3%, Mo: 1.2%, Y: 0.09%, Hf: 0.12%, B: 0.004%, S≤0.02%, P≤0.02%, O≤0.02%, N≤0.02%, the balance is Fe and not Impurities to avoid, said impurity content ≤ 0.5%.
Embodiment 2
[0029] Example 2, a nickel-based gas valve alloy, the chemical composition is based on weight percentage, containing Ni: 60%, Cr: 25%, C: 0.02%, Al: 1.7%, Ti: 2.3%, W: 1.4%, Nb : 1.5%, Mo: 1.0%, Y: 0.08%, Hf: 0.08%, B: 0.004%, S≤0.02%, P≤0.02%, O≤0.02%, N≤0.02%, the balance is Fe and not Impurities to avoid, said impurity content ≤ 0.5%.
Embodiment 3
[0030] Embodiment 3, a nickel-based gas valve alloy, the chemical composition according to weight percentage, contains Ni: 58%, Cr: 23%., C: 0.04%, Al: 1.8%, Ti: 2.6%, W: 1.0%, Nb: 1.4%, Mo: 1.1%, Y: 0.1%, Hf: 0.06%, B: 0.003%, S≤0.02%, P≤0.02%, O≤0.02%, N≤0.02%, the balance is Fe and Unavoidable impurities, said impurity content ≤ 0.5%.
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Abstract
The invention discloses nickel-based air valve alloy. The nickel-based air valve alloy comprises 55.0 to 60.0% of Ni, 20.0 to 25.0% of Cr, 0.01 to 0.05% of C, 1.0 to 3.0% of Al, 1.0 to 3.0% of Ti, 0.5 to 1.5% of W, 0.5 to 1.5% of Nb, 0.5 to 1.5% of Mo, 0.05 to 0.20% of Y, 0.05 to 0.20% of Hf, 0.001 to 0.005% of B, not greater than 0.02% of S, not greater than 0.02% of P, not greater than 0.02% of O, not greater than 0.02% of N, and the balance of Fe and inevitable impurities, wherein the impurity content is not greater than 0.5%. The preparation method comprises the steps of sensing and melting under a vacuum condition; casting an electrode; remelting electroslag; thermally forging; locally modifying and grinding a quadrate ingot blank; thermally rolling; compensating temperature online; thermally rolling a steel wire rod. The nickel-based air valve alloy has high-temperature durability, high-temperature oxidation resistance, high wearability and high-temperature corrosion resistance.
Description
technical field [0001] The invention relates to a metal material and a preparation method thereof, in particular to a nickel-based gas valve alloy and a preparation method thereof. Background technique [0002] Valve steel has experienced multiple development stages such as carbon steel and low alloy steel ─ ─ silicon chromium stainless steel ─ а phase alloy ─ austenitic heat-resistant steel. In recent decades, the rapid development of engine (internal combustion engine) technology, such as: gasoline engine direct injection technology, variable valve timing technology, variable intake pipe, combustion rate control slide, variable displacement technology, high pressure common rail direct injection diesel engine etc., the load is higher than before, which makes the working temperature of the valve steel increase, the pressure is increased, the gas corrosion is serious, the reciprocating motion of the valve cone surface accelerates the wear, and the working conditions of the va...
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Application Information
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