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High mn steel sheet and method for producing same

A steel plate and high-quality technology, applied in the field of structural steel, can solve problems such as structural damage, and achieve the effects of improved safety, excellent stress corrosion cracking resistance, and excellent economic efficiency

Active Publication Date: 2019-07-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When there is residual stress in bending, welding, etc. during fabrication, or load stress in the use environment, stress corrosion cracking that occurs in this way may cause damage to the structure

Method used

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  • High mn steel sheet and method for producing same
  • High mn steel sheet and method for producing same
  • High mn steel sheet and method for producing same

Examples

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Embodiment

[0116] Hereinafter, the present invention will be described in detail through examples. In addition, this invention is not limited to the following Example.

[0117] Through the converter-ladle refining-continuous casting method, for the steel slabs (raw material thickness: 250~300mm) prepared with various compositions shown in Table 1-1 and Table 1-2, they are heated to (Tx-50)℃ Above and below (Tx+200)°C (x=Nb, V or Ti), hot rolling was carried out under the manufacturing conditions shown in Table 2-1 and Table 2-2, and then in Table 2-1 and Table 2 Cooling was performed under the manufacturing conditions shown in -2. It should be noted that (Tx-50)°C and (Tx+200)°C in Nb, V, or Ti are shown in Table 1-1 and Table 1-2, respectively.

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Abstract

Provided are a high Mn steel sheet and a method for producing this high Mn steel sheet. This high Mn steel sheet has a component composition which contains, in mass%, 0.20-0.70% of C, 0.05-1.0% of Si,15-30% of Mn, 0.028% or less of P, 0.02% or less of S, 0.01-0.1% of Al, 0.5-7.0% of Cr, 0.03-0.30% of Ni and 0.0010-0.0200% of N, while containing one or more of 0.003-0.030% of Nb, 0.03-0.10% V and0.003-0.040% of Ti, with the balance made up of Fe and unavoidable impurities. With respect to this high Mn steel sheet, the microstructure at 0.5 mm below the steel sheet surface has a matrix phase of austenite; and 25% or more of the austenite in terms of area ratio has a circle-equivalent diameter of 10 um or more, while having an aspect ratio of the length to the breadth of 3 or more.

Description

technical field [0001] The present invention relates to a structural steel suitable for use in extremely low temperature environments such as tanks for liquefied gas storage tanks, especially a high-Mn steel plate excellent in stress corrosion cracking resistance in a salt water corrosion environment, and a manufacturing method thereof. Background technique [0002] When hot-rolled steel sheets are used in structures for liquefied gas storage tanks, since the use environment is extremely low temperature, not only the strength of the steel sheets but also the toughness at extremely low temperatures is required. For example, when using a hot-rolled steel sheet for a liquefied natural gas storage tank, it is necessary to ensure excellent toughness at -164° C. or lower, the boiling point of liquefied natural gas. If the low-temperature toughness of the steel material is poor, there is a danger that the safety as a structure for an ultra-low temperature storage tank cannot be mai...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/02C22C38/58
CPCC22C38/58C22C38/001C22C38/02C22C38/04C22C38/06C22C38/48C22C38/50C22C38/12C21D2211/001C21D6/005C21D9/46C21D8/0226C21D8/0263C21D8/02
Inventor 植田圭治长谷和邦
Owner JFE STEEL CORP
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