Preparation method of extremely low temperature steel for superconducting magnet protective sleeve of tokamak device

Abstract

The ultra-low temperature steel used for the protective cover of the superconducting magnet of the tokamak device and the preparation method thereof of the invention belong to the technical field of iron and steel materials. The chemical composition of extremely low temperature steel is: C: 0.30-0.61%, Si: 0.12-0.64%, Mn: 16.8-25.2%, Al: 2.0-6.1%, P≤0.020%, S≤0.006%, the remainder For Fe and inevitable impurities. The production method is as follows: after the ingot is smelted, cast and homogenized, controlled rolling, cooling and subsequent heat treatment are used to obtain extremely low temperature steel. This extremely low temperature steel has non-ferromagnetic properties and is matched with superconducting magnet Nb 3 During the preparation of Sn, after pre-straining and long-term aging treatment, the mechanical properties at 4.2K are far higher than the mechanical properties of the existing protective sheath materials, and are better than 316LN, JK2LB and other existing extremely low temperature steels. Austenite is stabilized by cheap Mn element, instead of precious metals such as Ni, Cr, Mo, and the ability to resist aging brittleness is improved by Al element, which greatly reduces the cost of the alloy.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to an extremely low temperature steel for a superconducting magnet protective sleeve of a tokamak device and a preparation method thereof. Background technique [0002] With the development of modern society, human demand for energy is also increasing. Traditional petrochemical energy reserves are limited, non-renewable, and polluting, causing serious damage to the environment. The main fuel for controllable nuclear fusion is the isotope of hydrogen, which can be obtained from seawater and has the characteristics of abundant reserves and high efficiency. Achieving controllable nuclear fusion is a new energy that human beings dream of, and it is also an effective way to solve human energy shortage. The ITER (International Thermonuclear Experimental Reactor) device is a superconducting tokamak device that can produce large-scale nuclear fusion reactions,...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of high cost and insufficient performance of materials used in the superconducting magnet protective sleeve of the existing tokamak device, the present invention provides a high manganese type ultra-low temperature (4.2K) protective sleeve applied to the superconducting magnet protective sleeve of the tokamak device Steel design and methods of preparation

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