High-strength nickel-saving air valve steel and preparation method thereof
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A valve steel, high-strength technology, applied in the field of alloy steel, can solve the problems of restricting application and increasing production costs, and achieve the effect of reducing costs
Active Publication Date: 2013-11-20
CENT IRON & STEEL RES INST
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However, the nickel content in these alloys is more than 70%, which increases its production cost and limits its application.
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[0014] The present invention will be further described below in conjunction with a typical embodiment.
[0015] In this example, a total of 6 furnaces of gas valve steel were smelted, which were smelted by vacuum induction + vacuum self-consumption smelting process, electric arc furnace + electroslag remelting process and intermediate frequency induction furnace + electroslag remelting process. The composition of the gas valve steel in the 6 furnaces is shown in Table 1. First cut the head and tail of the steel ingot to remove the parts with more impurities, and then polish the surface to clean the surface to avoid cracks during forging. The forging blank is carried out on a 2000-ton fast forging machine. The forging blanking temperature is 1100-1120°C, and the final forging temperature is 920-940°C. It is forged into a 140mm×140mm square billet for subsequent hot rolling. The hot rolling temperature is 1100~1120℃, the final rolling temperature is 910~930℃, and the rolling is...
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Abstract
The invention relates to a high-strength nickel-saving air valve steel and a preparation method thereof. The high-strength nickel-saving air valve steel comprises the following chemical components in percentage by weight: 0.01-0.25% of C, 0.5-1.8% of Si, 0.20-1.80% of Mn, at most 0.030% of P, at most 0.030% of S, 16.0-24.0% of Cr, 18.0-28.0% of Ni, 0.5-2.5% of Al, 1.5-3.5% of Ti, 0.5-2.5% of Nb, 0.1-0.5% of V, 0.001-0.050% of Zr, 0.001-0.030% of Ce, at most 0.30% of Cu, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: after carrying out vacuum induction and vacuum self-consuming smelting, or arc furnace smelting+electroslag remelting or intermediate-frequency induction smelting and electroslag remelting smelting, forging to obtain a 140mm*140mm square billet, wherein the hammer cogging temperature of the steel ingot is 1100-1120 DEG C, and the final forging temperature is 920-940 DEG C; rolling, and cooling with water, wherein the hot rolling temperature is 1100-1120 DEG C, and the finishing temperature is 910-930 DEG C; and after rolling, carrying out solid solution treatment, unreeling, straightening, and polishing to form the silver air valve steel. Compared with the existing high-performance air valve alloy, the invention has the advantages of higher strength and low cost.
Description
technical field [0001] The invention belongs to the technical field of alloy steel, in particular to a high-strength nickel-saving valve steel and a preparation method thereof, which are used for manufacturing intake valves and exhaust valves of diesel engines, gasoline engines and natural gas engines used in ships, trains and automobiles. Background technique [0002] Internal combustion engines can be divided into gasoline engines, diesel engines, compressed natural gas engines, liquefied petroleum gas engines, and dual-fuel engines. Gasoline engine is an internal combustion engine that uses gasoline as fuel. It uses a carburetor or electric injection to mix gasoline and air and then inhales it into the engine cylinder. Diesel engine is an internal combustion engine that uses diesel as fuel. It uses a fuel injection pump to directly inject diesel into the cylinder of the engine from the fuel injector under high pressure, and mixes with the compressed high-temperature air i...
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