Nickel-saving type gas valve alloy and preparation method thereof

Abstract

The invention relates to a nickel-saving type gas valve alloy and a preparation method thereof and belongs to the technical field of gas valve alloys. The nickel-saving type gas valve alloy comprises the following chemical components in percentage by weight: 0.01-0.30% of C, 0.10-0.50% of Si, 0.40-2.0% of Mn, not more than 0.030% of P, not more than 0.030% of S, 24.0-28.0% of Cr, 40.0-50.0% of Ni, 0.7-2.5% of Al, 1.0-3.7% of Ti, 0.2-2.5% of Nb, 0.2-1.2% of Mo, 0.05-0.5% of V and the balance of Fe and inevitable impurities. A vacuum induction furnace is adopted for smelting, an electrode is poured, a gas is adopted for protecting an electroslag furnace for electroslag re-melting and cogging and forging are performed on a steel ingot to prepare a rolled compact. The cogging temperature of the steel ingot is 1120-1140 DEG C, the forging temperature of the steel ingot is 1120-1130 DEG C, the final forging temperature is 940-980 DEG C and the square rolled compact of 140mm*140mm is forged. The rolled compact passes through a rough rolling mill, an intermediate rolling mill, a finish rolling mill and a reducing and sizing mill and enters a high-speed wire rod rolling mill. The nickel-saving type gas valve alloy has the advantages of low cost, high tensile strength, high fatigue limit and good high-temperature oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of gas valve alloys, in particular to a nickel-saving type gas valve alloy and a preparation method thereof, which are used to manufacture various intake valves and exhaust valves of internal combustion locomotives, and have high strength and good economy. Background technique [0002] Gas valve steel and gas valve alloy are important materials for manufacturing gas valves, and gas valves are essential parts in internal combustion engines such as gasoline engines, diesel engines, compressed natural gas engines, liquefied petroleum gas engines and dual-fuel engines. Under the high temperature generated by the combustion of medium oil and gas mixture, at the same time, it is under the scouring of the corrosive medium produced by insufficient oil combustion, and it must also work under long-term cyclic loads. Therefore, the valve steel and valve alloy must not only have High high temperature strength and hardne...

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Problems solved by technology

In short, austenitic valve steel has good high-temperature performance, poor processability and moderate cost, and is suitable for medium and high-load exhaust valves.

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