High-strength and high-corrosion-resistance austenitic stainless steel and manufacturing method thereof

A kind of technology of austenitic stainless steel and production method, which is applied in the field of high-strength corrosion-resistant austenitic stainless steel materials, can solve the problems of poor cold working performance, easy embrittlement of duplex stainless steel, low corrosion resistance, etc., and achieve good low temperature toughness, Good molding manufacturability and the effect of widening the temperature range of thermal processing

Active Publication Date: 2018-11-23
LUOYANG SUNRUI SPECIAL EQUIP
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Problems solved by technology

[0002] Existing stainless steel can be divided into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, duplex stainless steel, precipitation hardening stainless steel, etc. according to the structure type. Among them, martensitic stainless steel and precipitation hardening stainless steel can be strengthened by heat treatment. , the rest of the stainless steel is usually used in a solid solution state, the hardness is low, and it is difficult to meet the requirements of corrosion resistance and high strength at the same time. If medium temperature precipitation strengthening is used, the corrosion resistance of the material is usually seriously affected due to local depletion of elements due to phase precipitation.
Duplex stainless steel is composed of two phases of ferrite and austenite, usually the proportion of one phase is between 30% and 70%, and it also has high stress corrosion resistance, high strength and austenite of ferritic stainless steel. Body stainless steel has the characteristics of good low-temperature toughness and good welding performance, but because it has a ferrite content of about 50%, it is magnetic, which severely limits the applications that require magnetic properties. At the same time, duplex stainless steel is prone to embrittlement and cold working performance also worse
[0003] High-strength austenitic stainless steel is currently mainly high-Mn and high-N series stainless steel. This type of stainless steel can obtain high strength in solid solution state, but due to the high Mn content of the material, the corrosion resistance is low, and it is easy to occur during use. Pitting corrosion, crevice corrosion and other defects
At the same time, the low temperature impact toughness of high Mn and high N steel is not good, which also limits its low temperature application
[0004] Among the existing austenitic stainless steels, there are 254SMo, 654SMo, etc. that satisfy the PREN index ≥ 43, but due to the limitation of low Cr content and other factors, the strength is low, and it is difficult for Rm to reach a level above 750MPa stably

Method used

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  • High-strength and high-corrosion-resistance austenitic stainless steel and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 2

[0045] The chemical composition percentage of stainless steel castings is: C: 0.065%, Si: 0.86%, Mn: 3%, S: 0.005%, P: 0.045%, Cr: 30.5%, Ni: 29.5%, Mo: 4.2%, N: 0.40 %, PREN=30.5+3.3*4.2+16*0.40=50.76.

[0046] After smelting and casting, the mechanical properties after solution treatment at 1050 degrees are as follows: Rp0.2=625MPa; Rm=895MPa; A=35%; Z=57%.

Embodiment 3

[0048] The chemical composition percentage of stainless steel forgings is: C: 0.012%, Si: 0.05%, Mn: 6%, S: 0.01%, P: 0.042%, Cr: 30.5%, Ni: 28.5%, Mo: 3.2%, N: 0.25 %, PREN=30.5+3.3*3.2+16*0.25=45.06.

[0049] After smelting and casting, the mechanical properties after solution treatment at 1050 degrees are as follows: Rp0.2=545MPa; Rm=790MPa; A=42%; Z=62%.

[0050] (4) Embodiment 4

[0051] The chemical composition percentage of stainless steel castings is: C: 0.075%, Si: 0.05%, Mn: 6.8%, S: 0.02%, P: 0.04%, Cr: 31.5%, Ni: 31.0, Mo: 5.5%, N: 0.45% , PREN=31.5+3.3*5.5+16*0.45=56.85.

[0052] After smelting and casting, the mechanical properties after solution treatment at 1050 degrees are as follows: Rp0.2=725MPa; Rm=925MPa; A=30.5%; Z=52%.

[0053] The above-mentioned A is the elongation, and Z is the reduction of area.

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Abstract

The invention discloses high-strength and high-corrosion-resistance austenitic stainless steel and a manufacturing method thereof. The austenitic stainless steel comprises raw materials including, bymass percent, smaller than or equal to 0.1% of C, smaller than or equal to 2% of Si, smaller than or equal to 7% of Mn, smaller than or equal to 0.1% of S, smaller than or equal to 0.1% of P, 28%-35%of Cr, 26%-32% of Ni, 3%-8% of Mo, 0.2%-0.5% of N and the balance Fe and inevitable impurities, wherein Ni/Mn >= 4, and PREN=(Cr+3.3*Mo+16*N)>=43. Through selection of the high Cr content, the high Mocontent, the high N content and the high Ni content, a solid-solution-state austenite structure with high dislocation density is obtained, and the strength of the austenitic stainless steel is greatly improved.

Description

technical field [0001] The invention belongs to the field of high-strength and corrosion-resistant austenitic stainless steel materials, and specifically relates to a high-strength and high-corrosion-resistant austenitic stainless steel and a manufacturing method thereof. Background technique [0002] Existing stainless steel can be divided into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, duplex stainless steel, precipitation hardening stainless steel, etc. according to the structure type. Among them, martensitic stainless steel and precipitation hardening stainless steel can be strengthened by heat treatment. , the rest of the stainless steel is usually used in a solid solution state, the hardness is low, and it is difficult to meet the requirements of corrosion resistance and high strength at the same time. If medium temperature precipitation strengthening is used, the corrosion resistance of the material is usually seriously affected ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C38/58C22C38/34C22C38/02C22C38/04C22C38/60C22C38/44C21D6/00
CPCC21D6/004C21D6/005C21D6/008C21D2211/001C22C30/00C22C38/001C22C38/02C22C38/04C22C38/34C22C38/44C22C38/58C22C38/60
Inventor 范芳雄钟玉平王灵水
Owner LUOYANG SUNRUI SPECIAL EQUIP
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