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

A high-toughness steel and high-manganese technology, which is applied in the field of high-manganese high-toughness steel and its preparation, can solve the problems of insufficient performance and high material cost, and achieve the effects of excellent ultra-low temperature toughness, low control precision requirements, and wide process window

Active Publication Date: 2022-01-21
NORTHEASTERN UNIV
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  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment 1-8

[0038] The high-manganese type high-toughness steel applicable at the temperature of 4.2K in the embodiment has the following chemical composition by weight percentage: C: 0.40-0.68%, Si: 0.18-0.54%, Mn: 17.8-24.6%, Al: 0-5.1 %, Cr: 0~5.4%, Cu: 0~0.52%, V: 0~0.27%, Nb: 0~0.24%, P: ≤0.030%, S: ≤0.016%, the balance is Fe and unavoidable Impurities. The specific chemical composition is shown in Table 1.

[0039] The preparation method of the applicable high manganese type high toughness steel under 4.2K temperature, the steps are as follows:

[0040] Step 1, casting:

[0041] Smelting at 1650°C according to the composition ratio of the high-manganese type high-toughness steel applicable at the above-mentioned 4.2K temperature, pouring the obtained molten steel into an iron mold to obtain a square thin ingot with a thickness of 50-74mm;

[0042] Step 2, heating:

[0043] Reheat the square thin ingot to 1200°C and keep it warm for 2 hours;

[0044] Step 3, rolling:

[0045] T...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/16C22C38/12C22C38/38C22C38/20C22C38/24C22C38/26C21D8/02C21D1/18
CPCC22C38/04C22C38/02C22C38/06C22C38/16C22C38/12C22C38/38C22C38/20C22C38/24C22C38/26C21D8/0226C21D8/0263C21D1/18C21D2211/001
Inventor 陈俊刘振宇任家宽王鹏杰陈其源李爽
Owner NORTHEASTERN UNIV
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