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High Mn steel plate and its manufacturing method

A steel plate and quality technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as structural damage, and achieve the effect of improving safety, excellent economy, and excellent resistance to stress corrosion cracking

Active Publication Date: 2021-06-22
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 plate and its manufacturing method
  • High Mn steel plate and its manufacturing method
  • High Mn steel plate and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

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

The invention provides a high Mn steel plate and a manufacturing method thereof. The high Mn steel sheet has a composition containing C: 0.20 to 0.70%, Si: 0.05 to 1.0%, Mn: 15 to 30%, P: 0.028% or less, and S: 0.02% or less in mass % , Al: 0.01-0.1%, Cr: 0.5-7.0%, Ni: 0.03-0.30%, N: 0.0010-0.0200%, and contains Nb: 0.003-0.030%, V: 0.03-0.10%, Ti: 0.003-0.040 %, the balance is Fe and unavoidable impurities, the microstructure of 0.5mm below the surface of the steel plate is based on austenite, and the area ratio of the austenite is 25% The above circle-equivalent diameter is 10 μm or more, and the aspect ratio of the major axis to the minor axis is 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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Patent Type & Authority Patents(China)
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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