A method for manufacturing an alloy with excellent durability under high temperature and high pressure conditions

Abstract

The invention provides a method for manufacturing an alloy with excellent durability under high temperature and high pressure conditions, comprising the following steps: 1) raw material preparation; 2) vacuum smelting, including: 2.1) charging; 2.2) melting; 2.3) refining; 2.4) pouring ; 3) electroslag remelting; 4) forging; 5) heat treatment; 6) durability performance testing, sampling, peeling, inspection, packaging, storage, and completing the manufacture of alloys with excellent durability under high temperature and high pressure conditions. On the one hand, the manufacturing method optimizes the design of alloying elements; moreover, in combination with the above-mentioned traditional vacuum degassing and desulfurization technologies, the desulfurization and degassing effects of Ni-Mg and rare earth are especially increased; on the other hand, Cr-Ni-Mo is optimized. The heat treatment process of ‑W alloy successfully produced a high-end Cr‑Ni‑Mo‑W alloy steel with a durable life of more than 500 hours under the conditions of high temperature 815 °C and high pressure 110 MPa.

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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