Austenitic stainless steel and manufacturing method thereof
A technology of austenitic system and manufacturing method, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems that stainless steel can not get hydrogen embrittlement resistance and high-strength machinability, and achieve excellent machinability and excellent hydrogen embrittlement resistance. and high-strength effects
Active Publication Date: 2019-02-05
NIPPON STEEL CORP
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Problems solved by technology
Therefore, the stainless steels described in the above-mentioned Patent Documents 1 to 4 sometimes fail to obtain excellent hydrogen embrittlement resistance, high strength, and excellent machinability.
Method used
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[0110] [experiment method]
[0111] Molten steels having chemical compositions of test numbers A1 to A20 and B1 to B9 shown in Table 1 were produced using a vacuum melting furnace.
[0112] [Table 1]
[0113]
[0114] F1 in Table 1 is described as the F1 value defined above. Using the molten steel of each test number, 50 kg of ingots were produced. Hot forging was performed on the ingot to produce a block with a thickness of 70 mm.
[0115] For the produced block, final hot working (hot rolling) is performed to produce an austenitic stainless steel sheet. Table 2 shows the heating temperature (° C.) and area reduction ratio RA (%) during the final hot working. Only test number B9 was subjected to solution heat treatment. The temperature of the solution heat treatment was 1060° C., and the heating time was 30 minutes.
[0116] [Table 2]
[0117]
[0118] [Determination test of grain size]
[0119] The steel plate of each test number was cut|disconnected perpendicu...
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Abstract
The present invention provides an austenitic stainless steel having high strength, excellent resistance to hydrogen embrittlement, and also excellent machinability. The austenitic stainless steel of the present embodiment has a chemical composition containing, by mass%, C: 0.10% or less, Si: 1.0% or less, Mn: 2.1 to 6.0%, P: 0.045% or less, and S: 0.1% or less , Ni: 8.0~16.0%, Cr: 15.0~30.0%, Mo: 1.0~5.0%, N: 0.05~0.45%, Nb: 0~0.50%, and, V: 0~0.50%, the balance is Fe and impurities, and satisfy formula (1). The austenitic stainless steel of the present embodiment has a grain size rank number of less than 8.0 and a tensile strength of 690 MPa or more. 15≤12.6C+1.05Mn+Ni+15N (1).
Description
technical field [0001] The present invention relates to stainless steel and a method for producing the same, and more specifically relates to austenitic stainless steel and a method for producing the same. Background technique [0002] In recent years, development of fuel cell vehicles that run using hydrogen as fuel and hydrogen stations that supply hydrogen to fuel cell vehicles has been conducted. Stainless steel is one of the candidates for materials used in fuel cells. [0003] When stainless steel is used for a fuel cell, the stainless steel is used in a high-pressure hydrogen atmosphere. Therefore, stainless steel used in fuel cell applications requires excellent resistance to hydrogen embrittlement. Currently, SUS316L is designated as a stainless steel with excellent hydrogen embrittlement resistance in the standards for compressed hydrogen gas containers for automobiles stipulated in the High Pressure Gas Safety Act. [0004] However, in consideration of weight r...
Claims
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IPC IPC(8): C22C38/00C21D8/00C22C38/60
CPCC22C38/00C21D6/004C21D6/005C21D7/13C21D8/0226C21D2211/001C21D8/005C21D9/0068C22C38/001C22C38/02C22C38/44C22C38/46C22C38/48C22C38/58Y02E60/50C22C38/60C21D8/00B21D22/022C22C33/04C22C38/002
Inventor 旦越雄照沼正明小薄孝裕大村朋彦中村润
Owner NIPPON STEEL CORP