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Austenitic stainless steel and method for producing same

A technology of austenitic system and manufacturing method, which is applied in the field of stainless steel and its manufacturing, can solve the problem that stainless steel does not have hydrogen embrittlement resistance and high-strength machinability, and achieve excellent machinability, excellent hydrogen embrittlement resistance and high-strength. Effect

Active Publication Date: 2016-11-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Austenitic stainless steel and method for producing same
  • Austenitic stainless steel and method for producing same
  • Austenitic stainless steel and method for producing same

Examples

Experimental program
Comparison scheme
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Embodiment

[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

Provided is austenitic stainless steel which has high strength and excellent hydrogen embrittlement resistance, and which additionally has excellent machinability. Austenitic stainless steel according to one embodiment of the present invention has a chemical composition which contains, in mass%, 0.10% or less of C, 1.0% or less of Si, 2.1-6.0% of Mn, 0.045% or less of P, 0.1% or less of S, 8.0-16.0% of Ni, 15.0-30.0% of Cr, 1.0-5.0% of Mo, 0.05-0.45% of N, 0-0.50% of Nb and 0-0.50% of V with the balance made up of Fe and impurities, and which satisfies formula (1). This austenitic stainless steel has a crystal grain size 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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Application Information

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Patent Type & Authority Applications(China)
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
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