Precipitation-hardened martensitic stainless steel
A martensitic stainless steel, precipitation hardening technology, applied in furnace types, furnaces, heat treatment equipment, etc., to solve problems such as use restrictions
Pending Publication Date: 2021-08-20
DAIDO STEEL CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0017] However, conventional precipitation-hardening martensitic stainless steels are brittle at low temperatures, so their use at low temperatures is limited
In addition, no precipitation hardening martensitic stainless steel exhibiting high toughness even at low temperatures has been proposed in the related art.
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1 to 36 and comparative example 1 to 10
[0161] [1. Production of samples]
[0162] In a vacuum induction furnace, 50 kg of steel having the respective compositions shown in Tables 1, 2 and 3 were melted and cast into ingots. Subsequently, the ingot was subjected to a homogenization heat treatment at 1,200° C. for 24 hours and air-cooled. Then, a round bar with a diameter of 24 mm was forged under the conditions of a starting temperature of 1,200° C. and an ending temperature of 900° C., followed by air cooling.
[0163] Next, each steel ingot was solution heat-treated at 1,000° C. for 1 hour, and water-cooled. Subsequently, subzero treatment was carried out at -76°C for 6 hours. Next, aging treatment was performed on the condition of 530 degreeC for 4 hours, and air cooling was performed.
[0164]
[0165]
[0166]
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Abstract
The present invention relates to a precipitation-hardened martensitic stainless steel containing 0<C<0.10 mass%, 0<Si 10 and one mass%, 0<Mn 10 and one mass%, 8.0 mass% 00 and one precipitate mass%, 8.0 mass% 00 and one precipitate mass%, 0.4 mass% 40 and one precipitate mass%, the remainder being Fe and unavoidable impurities.
Description
technical field [0001] The present invention relates to a precipitation hardening martensitic stainless steel, and more particularly to a precipitation hardening martensitic stainless steel having excellent strength and toughness at room temperature and excellent toughness at low temperature. Background technique [0002] Precipitation hardening stainless steel refers to the steel in which a small amount of Al, Cu, Mo, Ti, etc. are added to Cr-Ni stainless steel, and intermetallic compounds are precipitated in the matrix phase through heat treatment. According to the structure of the matrix phase, precipitation hardening stainless steel is divided into martensitic stainless steel, semi-austenitic stainless steel and austenitic stainless steel. Among them, precipitation-hardening martensitic stainless steel such as SUS 630, PH 13-8Mo, or Custom 465 is excellent in corrosion resistance, strength, and toughness, and thus is used in aerospace structural parts and the like. [0...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/06C22C38/50C22C38/52C22C38/44C22C38/46C22C38/54
CPCC22C38/02C22C38/04C22C38/48C22C38/06C22C38/50C22C38/52C22C38/44C22C38/46C22C38/54C22C38/005C21D2211/008C21D9/46C22C38/002
Inventor 高桥伸幸冈本晃彦古庄千纮高林宏之小柳祯彦
Owner DAIDO STEEL CO LTD