Steel and method for manufacturing same
A manufacturing method and billet technology, which can be used in manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of high alloy cost and manufacturing cost, and achieve the effects of excellent low temperature toughness, improved life, and excellent economy.
Pending Publication Date: 2022-04-01
JFE STEEL CORP
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- Abstract
- Description
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Problems solved by technology
However, due to the high cost of alloys and high manufacturing costs, there is an urgent need for steels that are cheap and have excellent toughness at extremely low temperatures
Method used
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[0023] Hereinafter, the steel of the present invention will be described in detail.
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Abstract
This steel contains, in mass%, 0.100-0.700% of C, 0.05-1.00% of Si, 20.0-40.0% of Mn, less than or equal to 0.030% of P, less than or equal to 0.0050% of S, 0.01-5.00% of Al, 0.5-7.0% of Cr, 0.0050-0.0500% of N, less than or equal to 0.0050% of O, less than or equal to 0.005% of Ti, less than or equal to 0.005% of Nb, and one or more elements selected from the group consisting of 0.0005-0.0100% of Ca, 0.0005-0.0100% of Mg, and 0.0010-0.0200% of REM, and has a microstructure in which austenite serves as a base phase, the average crystal grain size is 50 [mu] m or less, and the cleanliness of sulfide-based inclusions is less than 1.0%. The yield strength is 400 MPa or above, and the brittle section rate after a Charpy impact test at-269 DEG C is less than 5%.
Description
technical field [0001] The present invention relates to steel suitable for structural steel used in extremely low-temperature environments such as liquid helium and liquefied gas, represented by tanks for storing liquid hydrogen, and a method for manufacturing the same. Background technique [0002] When hot-rolled steel sheets are used in liquid hydrogen, liquid helium, and liquefied gas storage tank structures, the steel sheets have high strength and are used in extremely low-temperature environments. Therefore, excellent toughness at extremely low temperatures is also required. For example, when a hot-rolled steel sheet is used for a storage tank of liquid helium, it is necessary to ensure excellent toughness at a temperature of -269° C. or lower, which is the boiling point of helium. If the ultra-low temperature toughness of the steel material deteriorates, the safety as a structure for an ultra-low temperature storage tank may not be maintained. Therefore, it is strongl...
Claims
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IPC IPC(8): C22C30/02C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02C22C30/00
CPCC22C38/38C22C38/58C21D8/02C22C38/26C22C38/28C22C38/002C22C38/005C22C38/02C22C38/06C22C38/001C22C38/20C22C38/22C22C38/24C22C38/48C22C38/50C21D9/46C21D8/0205C21D8/0226C21D8/0263C21D6/008C21D6/005Y02E60/32C22C38/46C22C38/44C21D2211/001C22C38/04
Inventor 泉大地中岛孝一植田圭治
Owner JFE STEEL CORP
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