Nickel-saving air valve alloy and preparation method thereof
An alloy and gas valve technology, applied in the field of nickel-saving gas valve alloy and its preparation, can solve the problems of increased raw material cost, and achieve the effects of reducing raw material cost, high yield, high strength and hardness
Active Publication Date: 2020-04-14
CENT IRON & STEEL RES INST
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Problems solved by technology
However, the content of alloying element nickel in these two valve alloys exceeds 65%, which greatly increases the cost of raw materials and limits their application.
Method used
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Embodiment Construction
[0018] The present invention will be further described below in conjunction with a typical embodiment.
[0019] In this embodiment, a total of 6 furnaces of gas valve alloy were smelted, and the smelting method adopted was medium frequency induction furnace smelting + electroslag remelting. The chemical composition after electroslag remelting is shown in Table 1. The raw material price of the gas valve alloy of the present invention is compared with the raw material prices of two kinds of gas valve alloys in China at present in Table 2, as can be seen from Table 2, the raw material cost of the gas valve alloy of the present invention is obviously lower than Inconel 751 and Inconel 751 and Nimonic 80A. The steel ingot smelted in the intermediate frequency furnace has a specification of Φ325mm and a weight of 2.0-2.2 tons. The steel ingots smelted in the intermediate frequency furnace are cut head and tail, and the surface is polished to become electrodes for electroslag remel...
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Abstract
The invention discloses a nickel-saving air valve alloy and a preparation method thereof, and belongs to the technical field of air valve alloys and manufacturing. The air valve alloy comprises the chemical components by the weight percentage: 0.04-0.12% of C, less than or equal to 0.70% of Si, less than or equal to 1.00% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S,20.00-25.00% of Cr, 23.00-27.00% of Ni, 0.80-2.00% of Al, 1.80-2.80% of Ti, 1.00-2.00% of Nb, 0.25-0.45% of V, and the balance being Fe and inevitable impurities. According to the preparation methodof the air valve alloy, a medium-frequency induction furnace and electroslag remelting smelting are adopted. The air valve alloy has the advantages that compared with the prior art, the air valve alloy has the characteristics of being lower in cost, higher in strength and hardness, reasonable in remelting smelting process and slag system selection, good in electroslag ingot surface quality, smallin head resection amount, high in yield and good in macrostructure.
Description
technical field [0001] The invention belongs to the technical field of gas valve alloys and manufacturing, in particular to a nickel-saving gas valve alloy and its preparation method (smelting by electroslag remelting), which is suitable for manufacturing diesel engines and gasoline engines for ships, trains, automobiles and motorcycles and the intake and exhaust valves of natural gas engines. Background technique [0002] Valve alloys are developed with the development of valve steel, and valve steel is divided into martensitic valve steel and austenitic valve steel according to the structure. Martensitic valve steel was the earliest developed, and the valve steel from the former Soviet Union was first introduced in China, such as 4Cr9Si2 and 4Cr10Si2Mo (эц107) introduced in the 1950s. Austenitic valve steel and valve alloys are developed with the continuous progress of internal combustion engines and the continuous improvement of the requirements for valve materials. The...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/50C22C38/48C22C38/46C22C33/06C22B9/18
CPCC22B9/18C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/46C22C38/48C22C38/50Y02P10/25
Inventor 王立民程杰锋李权赵吉庆陈正宗何西扣包汉生刘正东唐广波杨钢
Owner CENT IRON & STEEL RES INST