Steel and method for manufacturing same

A manufacturing method and microstructure technology, applied in the field of structural steel, can solve the problems of high alloy cost and manufacturing cost, and achieve the effect of excellent tensile performance and excellent economy

Active Publication Date: 2022-04-08
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its alloy cost and manufacturing cost are high, so an inexpensive steel material with excellent ultra-low temperature toughness is required

Method used

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  • Steel and method for manufacturing same
  • Steel and method for manufacturing same
  • Steel and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0099] Hereinafter, the present invention will be described in detail through examples. In addition, this invention is not limited to the following examples.

[0100] Steel billets (billet materials) having the composition shown in Table 1 were produced by a converter-ladle refining-continuous casting method. Next, under the conditions shown in Table 2, the obtained steel slab was hot-rolled into a steel plate with a thickness of 6 to 30 mm. Here, for each sample, the heating temperature at the time of reheating in the heat treatment was set to the same temperature as the heating temperature of the steel slab.

[0101] For the obtained steel sheets, microstructure evaluation and mechanical property evaluation of cryogenic toughness and tensile properties were carried out in the following manner.

[0102] In Table 2, "finish rolling temperature at the time of final rolling" indicates the final rolling finish temperature.

[0103] (1) Organization evaluation

[0104] ・The area...

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PUM

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Abstract

This steel has a component composition containing, in mass%, 0.100-0.700% of C, 1.00% or less of Si, 20.0-40.0% of Mn, 0.030% or less of P, 0.0070% or less of S, 0.01-5.00% of Al, 0.5-7.0% of Cr, 0.0050-0.0500% of N, 0.0050% or less of O, 0.005% or less of Ti, and 0.005% or less of Nb, with the remainder being Fe and unavoidable impurities, has a microstructure having austenite as a base phase and an average particle diameter of 80 [mu] m or more, and has an absorption energy of 150 J or more in a Charpy impact test at-269 DEG C, and the total elongation in a tensile test at-269 DEG C is 30% or more.

Description

technical field [0001] The present invention relates to structural steel suitable for use in extremely low-temperature environments such as liquid helium and liquefied gas, represented by storage tanks for storing liquid hydrogen, and particularly steel having excellent toughness at extremely low temperatures, and a method for producing the same. Background technique [0002] When hot-rolled steel sheets are used in structures for storing liquid hydrogen, liquid helium, and liquefied gas, excellent toughness at extremely low temperatures is required because the operating environment is extremely low temperature. For example, when using a hot-rolled steel sheet for liquid helium storage, it is necessary to ensure excellent toughness at a temperature of -269° C. or lower, which is the boiling point of helium. If the cryogenic toughness of the steel material is poor, the safety as a structure for cryogenic storage may not be maintained. Therefore, there is a strong demand for i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/38C22C38/06C22C38/28C22C38/26C22C38/20C22C38/22C22C38/24C22C38/58C22C38/50C22C38/48C22C38/42C22C38/44C22C38/46C21D8/02
CPCC22C38/38C22C38/58C21D8/02C22C38/26C22C38/28C22C38/02C22C38/06C22C38/001C22C38/002C22C38/20C22C38/22C22C38/24C22C38/005C22C38/48C22C38/50C21D9/46C21D8/0205C21D8/0226C21D8/0263C21D8/0273C21D6/005C21D8/0247C21D2211/001
Inventor 泉大地中岛孝一植田圭治
Owner JFE STEEL CORP
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