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High-manganese TWIP (Twining Induced Plasticity) low temperature resistant steel with high impact toughness and manufacturing method thereof

A low-temperature-resistant, high-impact technology, applied in the field of high-manganese TWIP low-temperature-resistant steel and its manufacturing, can solve the problems of high price and complicated smelting process, and achieve the effect of simple preparation process and low cost

Inactive Publication Date: 2018-06-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main application material of large LNG tanks is 06Ni9, which is called 9Ni in the United States. The main alloy component is expensive nickel element. Its smelting process is extremely complicated. At present, my country has no independent production capacity and mainly relies on imports.

Method used

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  • High-manganese TWIP (Twining Induced Plasticity) low temperature resistant steel with high impact toughness and manufacturing method thereof
  • High-manganese TWIP (Twining Induced Plasticity) low temperature resistant steel with high impact toughness and manufacturing method thereof
  • High-manganese TWIP (Twining Induced Plasticity) low temperature resistant steel with high impact toughness and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] The chemical composition and mass percentage of the high-manganese TWIP low-temperature steel designed in this implementation are: C: 0.10%, Mn: 31%, Si: 0.35%, Al: 4.0%, and the rest is Fe. The estimated stacking fault energy at -196°C is 30.11mJ / m 2 .

[0039] The production method of high manganese TWIP low-temperature steel in this embodiment includes smelting, continuous casting, heating and rolling operations, and the specific process steps are as follows:

[0040] (1) Smelting process: Mn, Al, and Si elements are prepared according to the ratio of 104%, 110%, and 102% of the target mass fractions, and are smelted in a 50-ton converter. First add desulfurized and desiliconized molten iron into the furnace, the molten iron contains S: 0.006%, Si: 0.080%. Oxygen blowing smelting, the chemical composition of the smelting end point is as follows: C: 0.03%, Si: 0.07%, Mn: 0.12%, S: 0.003%, P: 0.002%. Add ferromanganese alloy, ferrosilicon alloy and pure aluminum to ...

Embodiment 2

[0081] The chemical composition and mass percentage of high-manganese TWIP low-temperature steel designed for this implementation are: C: 0.30%, Mn: 35%, Si: 1.5%, Al: 2.5%, and the rest is Fe and unavoidable impurities. The estimated stacking fault energy at -196°C is 28.28mJ / m 2 .

[0082] The production method of high manganese TWIP low-temperature steel in this embodiment includes smelting, continuous casting, heating and rolling operations, and the specific process steps are as follows:

[0083] (1) Smelting process: Mn, Al, and Si elements are prepared according to the ratio of 105%, 107%, and 102% of the target mass fraction, and are prepared for feeding according to the above-mentioned mass ratio, and are smelted in a 3-ton electric arc furnace. First add selected steel scrap into the furnace, S: 0.008% and P: 0.09% in the steel scrap. After the scrap steel is melted, the weighed ferrosilicon and ferromanganese alloys are added sequentially for alloying; after the adde...

Embodiment 3

[0093] The chemical composition and mass percentage of the high-manganese TWIP low-temperature steel designed for this implementation are: C: 0.12%, Mn: 32%, Si: 1.0%, Al: 3.5%, and the rest is Fe. The estimated stacking fault energy at -196°C is 25.54mJ / m 2 .

[0094] The production method of high manganese TWIP low-temperature steel in this embodiment includes smelting, continuous casting, heating and rolling operations, and the specific process steps are as follows:

[0095] (1) Smelting process: Mn, Al, and Si elements are prepared according to the proportion of 106%, 106% and 108% of the target mass fractions, and are prepared according to the above mass proportions, and are smelted in a 50-ton converter. First add desulfurized and desiliconized molten iron into the furnace, the molten iron contains S: 0.007%, Si: 0.080%. Oxygen blowing smelting, the chemical composition of the smelting end point is as follows: C: 0.04%, Si: 0.08%, Mn: 0.14%, S: 0.005%, P: 0.004%. Add ...

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Abstract

The invention relates to a high-manganese TWIP (Twining Induced Plasticity) low temperature resistant steel with high impact toughness. The low temperature resistant steel is prepared from the chemical components in percentage by mass: 0.050 to 0.30 percent of C, 25 to 35 percent of Mn, 0.30 to 1.5 percent of Si, 2.0 to 4.0 percent of Al, and the balance of Fe and inevitable impurities; the stacking fault energy of the low temperature resistant steel at minus 196 DEG C is 25 to 40mJ / m<2>. According to the low temperature resistant steel provided by the invention, the impact energy at liquid nitrogen temperature (minus 196 DEG C) ranges from 200J to 250J, the impact energy at room temperature ranges from 300J to 350J, the yield strength ranges from 200MPa to 300MPa, the tensile strength ranges from 600MPa to 700MPa, and the percentage elongation after fracture ranges from 45 percent to 65 percent.

Description

technical field [0001] The invention belongs to the technical field of low-temperature steel, and relates to a low-temperature steel and a manufacturing method thereof, in particular to a high-manganese TWIP low-temperature-resistant steel with high impact toughness and a manufacturing method thereof. Background technique [0002] In order to control global warming, reducing the emission of greenhouse gases has become the main goal of the world's energy development. Liquefied Natural Gas (LNG) is a new type of clean energy, the main component of which is methane (CH 4 ), is recognized as the cleanest fossil energy on earth. Non-toxic, colorless, odorless and non-corrosive, its volume is about 1 / 625 of the volume of gaseous natural gas of the same mass, and the mass of liquefied natural gas is only about 45% of the same volume of water. The manufacturing process of liquefied natural gas is to first purify the natural gas produced in the gas field, and then undergo a series ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C33/06C21D8/02
CPCC21D8/0226C21D2211/001C22C33/06C22C38/02C22C38/04C22C38/06Y02P10/20
Inventor 张昕夏昊冯建航殷福星
Owner HEBEI UNIV OF TECH
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