High-manganese type high-toughness steel applicable to temperature of 4.2 K and preparation method of high-manganese type high-toughness steel

Abstract

The invention relates to high-manganese type high-toughness steel applicable to the temperature of 4.2 K and a preparation method of the high-manganese type high-toughness steel, and belongs to the technical field of steel and iron materials. Chemical components of the high-toughness steel comprise, by weight percent, 0.40-0.68% of C, 0.18-0.54% of Si, 17.8-24.6% of Mn, 0-5.1% of Al, 0-5.4% of Cr, 0-0.52% of Cu, 0-0.27% of V, 0-0.24% of Nb, not larger than 0.030% of P, not larger than 0.020% of S and the balance of Fe and inevitable impurities. The preparation method comprises the steps that after smelting casting and homogenization treatment are carried out on a cast ingot, rolling cooling and heat treatment are carried out, and the high-manganese type high-toughness steel is prepared. Compared with traditional austenitic stainless steel in the extremely-low-temperature field, the steel is excellent in extremely-low-temperature impact toughness, the low-cost Mn element is adopted for stabilizing austenite, precious metal such as Ni, Cr and Mo is replaced, a single-phase austenite structure is obtained, the alloy cost is greatly reduced, and the high-manganese type high-toughness steel has wide application prospects in the fields of superconducting magnets of nuclear fusion reactors, liquid hydrogen/liquid oxygen rocket engine low-temperature propellant storage and the like.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to a high-manganese type high-toughness steel applicable at a temperature of 4.2K and a preparation method thereof. Background technique [0002] With the development of my country's aerospace industry, the development and development of heavy-duty launch vehicle power systems has become an inevitable choice for my country's development of manned moon landings and large-scale space exploration and applications. On the other hand, when the aircraft performs long-distance flight missions, liquid hydrogen / liquid oxygen cryogenic propellants are considered to be one of the most economical and efficient chemical propellants for orbit entry and orbit change. However, compared with traditional conventional propellants, low-temperature propellants have the characteristics of low boiling point, the boiling point of liquid hydrogen is 20.4K, and the boiling point o...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high cost and insufficient performance of existing extremely low temperature (4.2K) materials, the present invention provides a design and preparation method of high-manganese high-toughness steel applied at 4.2K temperature

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