Manufacturing method for alloys with excellent durability performance under high temperature and high pressure conditions

Abstract

The invention provides a manufacturing method for alloys with excellent durability performance under high temperature and high pressure conditions. The manufacturing method for the alloys with the excellent durability performance under the high temperature and high pressure conditions comprises the following steps of (1) raw material preparation, (2) vacuum smelting, (3) electroslag remelting, (4)forging, (5) heat treatment, and (6) durability performance testing, sampling, peeling, inspection, packaging and storage, wherein the step 2 comprises the steps of (2.1) charging, (2.2) melting, (2.3) refining, (2.4) pouring, and the manufacture of the alloys with the excellent durability performance under the high temperature and high pressure conditions is completed. On the one hand, the manufacturing method optimizes the design of alloy elements, moreover, the traditional vacuum degassing and desulphurization technology is combined, and the desulphurization and degassing effect of using Ni-Mg and rare earth is especially increased; and on the other hand, the heat treatment process of a Cr-Ni-Mo-W alloy is optimized, and high end Cr-Ni-Mo-W alloy steel with a lasting life of more than500 hours is successfully manufactured under the conditions of 815 DEG C high temperature and 110 MPa high pressure.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for manufacturing an alloy with excellent durability under high temperature and high pressure conditions. Background technique [0002] Durable strength refers to the ability of metal materials, mechanical parts and components to resist high temperature fracture. Often expressed as a persistent limit. The stress that causes fracture of the sample at a certain temperature and specified duration is called the endurance limit. [0003] Endurance life refers to the total time from the beginning of creep deformation to the fracture of the specimen. [0004] To improve the lasting life and strength, it is necessary to suppress the sliding of the grain boundary and the diffusion of vacancies, that is to say, to control the diffusion process in the grain and the grain boundary. Generally, the durable life and durable strength of alloys can be improved f...

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Problems solved by technology

[0024] Vacuum deoxidation, dehydrogenation, and denitrification are essentially a single method of diffusion deoxidation, diffusion dehydrogenation, and diffusion denitrification. It has a good effect in reducing the oxygen content, hydrogen content, and nitrogen content of molten steel in iron and steel smelting, but it still cannot meet the requirements. Requirements for high-end corrosion-resistant alloys on oxygen content, hydrogen content and nitrogen content in molten steel

Generally, at a vacuum degree of 66.7Pa (0.5mmHg), the deoxidation limit can only reach 35-45ppm, the dehydrogenation limit can only reach 5-6ppm, and the denitrification limit can only reach 25-35ppm.

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