Low-precipitation super ferrite cast stainless steel and preparation method thereof

A technology of super ferrite and stainless steel, applied in the field of low precipitation super ferrite cast stainless steel and its preparation, can solve problems such as deterioration of mechanical properties, reduce the size and content of inclusions, purify grain boundaries, and reduce grain boundary distortion energy. Effect

Active Publication Date: 2020-11-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that when the Al content reaches 1%, it has an inhibitory effect on the precipitation of the σ phase, but such a high Al content leads to the deterioration of its mechanical properties

Method used

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  • Low-precipitation super ferrite cast stainless steel and preparation method thereof
  • Low-precipitation super ferrite cast stainless steel and preparation method thereof
  • Low-precipitation super ferrite cast stainless steel and preparation method thereof

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Embodiment 1

[0034] A method for preparing low-precipitation super ferritic cast stainless steel, using a 50KG vacuum induction smelting furnace to smelt the stainless steel described in the present invention, the content of each component of the stainless steel is Cr 25%, Mo 1%, Al 0.03%, Ce 0.03%, C0.0017%, N0.0031%, S 0.0020%, P 0.0080%, the balance is Fe, and the specific steps are as follows:

[0035] (1) Put 5KG super ferritic stainless steel alloy ingot into the crucible, and add Al and Ce by hanging method.

[0036] (2) Turn on the vacuum pump, when the vacuum is evacuated to 10 Pa, the power is 35KW, and when the vacuum reaches 0.1 Pa, increase the power to 40KW, and melt the material.

[0037] (3) Keep the vacuum constant, increase the temperature of molten steel to 1550°C for refining for 15 minutes, then turn off the power and cool down to 1506°C for part of the conjunctiva;

[0038] (4) Keep the vacuum constant, put Al into the molten steel, then increase the power to 40KW, h...

Embodiment 2

[0042] A method for preparing low-precipitation super ferritic cast stainless steel, using a 50KG vacuum induction smelting furnace to smelt the stainless steel described in the present invention, the content of each component of the stainless steel is Cr 30%, Mo 2.11%, Al 0.05%, Ce 0.05%, C0.0020%, N 0.0026%, S 0.0020%, P 0.0070%, the balance is Fe, and the specific steps are as follows:

[0043] (1) Put 5KG super ferritic stainless steel alloy ingot into the crucible, and add Al and Ce by hanging method.

[0044] (2) Turn on the vacuum pump, when the vacuum is evacuated to 10 Pa, the power is 35KW, and when the vacuum reaches 0.1 Pa, increase the power to 40KW, and melt the material.

[0045] (3) Keep the vacuum constant, increase the temperature of the molten steel to 1600°C for refining for 10 minutes, then turn off the power and cool down to 1506°C for part of the conjunctiva;

[0046] (4) Keep the vacuum constant, put Al into the molten steel, then increase the power to...

Embodiment 3

[0056] A method for preparing low-precipitation super ferritic cast stainless steel, using a 50KG vacuum induction smelting furnace to smelt the stainless steel described in the present invention, the content of each component of the stainless steel is Cr 28%, Mo 4%, Al 0.04%, Ce 0.08%, C0.0020%, N0.0026%, S 0.0020%, P 0.0070%, the balance is Fe, and the specific steps are as follows:

[0057] (1) Put 5KG super ferritic stainless steel alloy ingot into the crucible, and add Al and Ce by hanging method.

[0058] (2) Turn on the vacuum pump, when the vacuum is evacuated to 10 Pa, the power is 35KW, and when the vacuum reaches 0.1 Pa, increase the power to 40KW, and melt the material.

[0059] (3) Keep the vacuum constant, increase the temperature of molten steel to 1650°C for refining for 8 minutes, then turn off the power and cool down to 1506°C for part of the conjunctiva;

[0060] (4) Keep the vacuum constant, put Al into the molten steel, then increase the power to 40KW, he...

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Abstract

The invention relates to low-precipitation super ferrite cast stainless steel and a preparation method thereof. The stainless steel comprises components of 25%-30% of Cr, 1-4% of Mo, 0.03%-0.05% of Al, 0.03%-0.08% of Ce, less than or equal to 0.0020% of C, less than or equal to 0.0031% of N, less than or equal to 0.0020% of S, less than or equal to 0.0090% of P, and the balance of Fe. During preparation, stainless steel ingots with corresponding content are taken, corresponding amounts of Al and Ce are added successively after smelting, refining is completed, and low-precipitation super ferrite stainless steel castings are prepared. By reducing the oxygen content of a matrix and adding rare earth Ce for microalloying treatment, the precipitation tendency of sigma phase of the stainless steel is obviously reduced, and the elongation and corrosion resistance of the super ferrite cast stainless steel castings are greatly improved.

Description

Technical field: [0001] The invention belongs to the technical field of stainless steel preparation, and in particular relates to a low-precipitation super ferrite cast stainless steel and a preparation method thereof. Background technique: [0002] Super ferritic stainless steel refers to a type of alloy with a Cr content of 25% to 30%, C+N ≤ 150ppm, pitting resistance equivalent (PRE) ≥ 35, and a ferrite structure. Compared with chromium-nickel austenitic stainless steel, ferritic stainless steel does not contain nickel or only contains a small amount of nickel, so it is a kind of nickel-saving stainless steel, and compared with austenitic stainless steel, ferritic stainless steel has higher strength and is cold-worked The hardening tendency is low, the thermal conductivity is 130% to 150% of austenitic stainless steel, and the linear expansion coefficient is only 60% to 70% of austenitic stainless steel. Chloride medium has excellent pitting corrosion, crevice corrosion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/22C22C33/06C21D6/00
CPCC21D6/002C21D2211/005C22C33/06C22C38/001C22C38/002C22C38/004C22C38/005C22C38/06C22C38/22
Inventor 宁礼奎段超辉谭政祝洋洋佟健刘恩泽柳一川郑志
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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