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HIGH-Mn STEEL AND METHOD FOR PRODUCING SAME

A manufacturing method and quality 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 improving safety, excellent surface properties, and excellent economy

Pending Publication Date: 2021-03-16
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the alloy cost and manufacturing cost are high, steel materials that are inexpensive and have excellent low-temperature toughness are desired

Method used

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  • HIGH-Mn STEEL AND METHOD FOR PRODUCING SAME
  • HIGH-Mn STEEL AND METHOD FOR PRODUCING SAME
  • HIGH-Mn STEEL AND METHOD FOR PRODUCING SAME

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0094] Hereinafter, the present invention will be described in detail through examples. It should be noted that the present invention is not limited to the following examples.

[0095] Steel slabs having the composition shown in Table 1 were produced by the converter-ladle refining-continuous casting method. Next, the obtained steel slabs were hot-rolled under the conditions shown in Table 2 to form steel plates with a thickness of 6 to 30 mm. The obtained steel sheets were evaluated for tensile properties, toughness, and structure in the following manner.

[0096] (1) Tensile test characteristics

[0097] JIS No. 5 tensile test pieces were cut out from each of the obtained steel plates, and a tensile test was performed in accordance with JIS Z 2241 (1998) to examine tensile test characteristics. In the present invention, a yield strength of 400 MPa or more and a tensile strength of 800 MPa or more are judged to be excellent in tensile properties. In addition, an elongatio...

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Abstract

Provided is a high-Mn steel having excellent low-temperature toughness and surface characteristics. The high-Mn steel includes, in mass%, C: 0.100% to 0.700%, Si: 0.05% to 1.00%, Mn: 20.0% to 35.0%, P: 0.030% or less, S: 0.0070% or less, Al: 0.010% to 0.070%, Cr: 0.50% to 5.00%, N: 0.0050% to 0.0500%, O: 0.0050% or less, Ti: 0.005% or less, and Nb: 0.005% or less; with the balance being Fe and unavoidable impurities, and has a microstructure with ostenite as matrix, wherein the Mn concentration in an Mn-concentrated portion in the microstructure is 38.0% or less, or the average kernel averagemisorientation (KAM) value is 0.3 or greater; the yield strength is 400 MPa or greater; the absorption energy vE-196 from a Charpy impact test at -196 DEG C is 100 J or greater; and the percent brittle fracture is less than 10%.

Description

technical field [0001] The present invention relates to a high Mn steel which is particularly excellent in toughness at low temperature, and a method for producing the same, which is suitable for structural steel used in extremely low temperature environments such as tanks for liquefied gas storage tanks. Background technique [0002] The use environment of structures such as tanks for liquefied gas storage tanks is extremely low temperature. Therefore, in order to use hot-rolled steel sheets for these structures, it is required that the steel sheets not only have excellent strength but also have excellent toughness at extremely low temperatures. For example, in a hot-rolled steel sheet used for a storage tank of liquefied natural gas, it is necessary to secure excellent toughness in a temperature range lower than -164° C. which is the boiling point of liquefied natural gas. If the low-temperature toughness of a steel sheet used for a structure for a cryogenic storage tank i...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/02C22C38/38
CPCC22C38/00C22C38/38C22C38/02C22C38/06C22C38/002C22C38/001C22C38/005C22C38/26C22C38/28C22C38/24C22C38/22C22C38/20C21D9/46C21D8/0226C21D6/005C21D6/002C21D8/0263C21D2211/001C21D8/021C21D8/0273
Inventor 泉大地木津谷茂树植田圭治中岛孝一
Owner JFE STEEL CORP
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