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HIGH-Mn STEEL AND PRODUCTION METHOD THEREFOR

A manufacturing method and microstructure technology, applied in the field of high Mn steel and its manufacturing, can solve the problems of high alloy cost and high manufacturing cost, and achieve the effects of excellent low-temperature toughness, excellent ductility, and excellent economy

Pending Publication Date: 2019-12-13
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high cost of alloys and high manufacturing costs, steel materials that are inexpensive and have excellent ultra-low temperature toughness are desired

Method used

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  • HIGH-Mn STEEL AND PRODUCTION METHOD THEREFOR
  • HIGH-Mn STEEL AND PRODUCTION METHOD THEREFOR

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Embodiment

[0097] The present invention will be described in detail below based on examples. In addition, this invention is not limited to the following examples.

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Abstract

The present invention proposes a method for imparting better ductility to high-Mn steel that has superior cryogenic toughness in both a welding heat-affected part and a matrix after being welded. Thishigh-Mn steel has a component composition comprising, in mass%, 0.30-0.90% of C, 0.05-1.0% of Si, 15-30% of Mn, not more than 0.030% of P, not more than 0.0070% of S, 0.01-0.07% of Al, 0.5-7.0% of Cr, 0.0050-0.0500% of N, not more than 0.0050% of O, the respective contained amounts of Ti and Nb being at suppressed levels of less than 0.005%, with the remaining portion being Fe and unavoidable impurities, wherein the high-Mn steel has a microstructure including austenite as a matrix phase, the area fraction of non-metal inclusion in the microstructure is less than 5.0%, and the high-Mn steel has a yield strength of at least 400 MPa and an absorption energy (vE-196) of at least 100 J.

Description

technical field [0001] The present invention relates to structural steel suitable for use in ultra-low temperature environments such as tanks for liquefied gas storage tanks, particularly high-Mn steel excellent in low-temperature toughness, and a method for producing the same. Background technique [0002] In order to use a hot-rolled steel sheet as a structure for a liquefied gas storage tank, since the use environment is ultra-low temperature, it is required that the steel sheet not only have high strength but also have excellent toughness at ultra-low temperature. For example, when using a hot-rolled steel sheet for a storage tank of liquefied natural gas, it is necessary to ensure excellent toughness at the boiling point of liquefied natural gas: -164° C. or lower. If the low-temperature toughness of the steel material is deteriorated, it may become impossible to maintain the safety as a structure for ultra-low temperature storage tanks. Therefore, it is strongly requir...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/02C22C38/38C22C38/58
CPCC21D8/02C21D8/0205C21D8/0226C21D9/46C22C38/00C22C38/001C22C38/002C22C38/005C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38C22C38/42C22C38/48C22C38/50C22C38/58
Inventor 荒尾亮泉大地植田圭治长谷和邦
Owner JFE STEEL CORP
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