A kind of high-temperature oxidation-resistant alloy steel and its preparation method

A technology for high-temperature oxidation resistance and alloy steel, applied in the field of alloy steel, can solve the problems of insufficient high-temperature oxidation resistance of materials, high material cost, and high amount of precious alloy elements, so as to achieve good high-temperature oxidation resistance and improve carburization resistance. performance, the effect of excellent high temperature mechanical properties

Inactive Publication Date: 2015-08-26
XI AN JIAOTONG UNIV +1
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  • Claims
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Problems solved by technology

[0004] However, the above-mentioned invention has defects such as a large amount of precious alloy elements added, high material cost, and insufficient high-temperature oxidation resistance of the material.

Method used

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  • A kind of high-temperature oxidation-resistant alloy steel and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Adopt 1000 kilograms of electric induction furnaces to smelt the material of the present invention, concrete process step is:

[0038] (1) Q235 steel scrap with a mass fraction of 40.0% (mass percent: 0.14~0.22C, 0.30~0.65Mn, Si≤0.30, S≤0.050, P≤0.045, Fe balance), 26.5% stainless steel scrap (% is: ≤0.07C, ≤1.0Si, ≤2.0Mn, 17.0~19.0Cr, 8.0~11.0Ni, ≤0.035P, ≤0.03S, Fe balance), 15.0% nickel-based alloy waste (mass percentage % is: ≤0.10C, ≤0.50Mn, ≤0.50Si, ≤0.015P, ≤0.015S, 20.0~23.0Cr, 58.0~60.0Ni, 8.0~10.0Mo, ≤0.40Ti≤0.40Al, ≤5.0Fe, 3.15 ~4.15Nb), 8.3% high-carbon ferrochrome (mass percent: 62.0~68.0Cr, 7.0~8.5C, 2.0~3.5Si, the balance is Fe) and 1.1% tungsten iron (mass percent: 75.0~85.0W, ≤0.4C, ≤0.05P, ≤0.07S, the balance Fe) mixed and heated to melt, the molten steel is melted and then the temperature is measured. When the molten steel temperature reaches 1562°C, add 1.1% ferrosilicon (mass The percentage % is: 74.0-80.0Si, ≤0.5Al, ≤1.0Ca, ≤0.035P, ≤0.02S, ≤0.1C...

Embodiment 2

[0042] Adopt 1000 kilograms of electric induction furnaces to smelt the material of the present invention, concrete process step is:

[0043] (1) Q235 steel scrap with a mass fraction of 40.5% (mass percent: 0.14~0.22C, 0.30~0.65Mn, Si≤0.30, S≤0.050, P≤0.045, Fe balance), 25.0% stainless steel scrap (% is: ≤0.07C, ≤1.0Si, ≤2.0Mn, 17.0~19.0Cr, 8.0~11.0Ni, ≤0.035P, ≤0.03S, Fe balance), 16.0% nickel-based alloy waste (mass percentage % is: ≤0.10C, ≤0.50Mn, ≤0.50Si, ≤0.015P, ≤0.015S, 20.0~23.0Cr, 58.0~60.0Ni, 8.0~10.0Mo, ≤0.40Ti≤0.40Al, ≤5.0Fe, 3.15 ~4.15Nb), 8.0% high-carbon ferrochrome (mass percent: 62.0~68.0Cr, 7.0~8.5C, 2.0~3.5Si, the balance is Fe) and 1.2% tungsten iron (mass percent: 75.0~85.0W, ≤0.4C, ≤0.05P, ≤0.07S, balance Fe) are mixed and heated to melt, and the temperature is measured after the molten steel is melted. The percentage % is: 74.0-80.0Si, ≤0.5Al, ≤1.0Ca, ≤0.035P, ≤0.02S, ≤0.1C, the balance Fe) and the mass fraction of 2.2% ferromanganese (mass percenta...

Embodiment 3

[0047] Adopt 1000 kilograms of electric induction furnaces to smelt the material of the present invention, concrete process step is:

[0048](1) Q235 steel scrap with a mass fraction of 39.55% (mass percent: 0.14~0.22C, 0.30~0.65Mn, Si≤0.30, S≤0.050, P≤0.045, Fe balance), 28.0% stainless steel scrap (% is: ≤0.07C, ≤1.0Si, ≤2.0Mn, 17.0~19.0Cr, 8.0~11.0Ni, ≤0.035P, ≤0.03S, Fe balance), 14.0% nickel-based alloy waste (mass percentage % is: ≤0.10C, ≤0.50Mn, ≤0.50Si, ≤0.015P, ≤0.015S, 20.0~23.0Cr, 58.0~60.0Ni, 8.0~10.0Mo, ≤0.40Ti≤0.40Al, ≤5.0Fe, 3.15 ~4.15Nb), 8.5% high-carbon ferrochrome (mass percent: 62.0~68.0Cr, 7.0~8.5C, 2.0~3.5Si, the balance is Fe) and 1.0% tungsten iron (mass percent: 75.0~85.0W, ≤0.4C, ≤0.05P, ≤0.07S, balance Fe) mixed and heated to melt, the molten steel is melted and the temperature is measured, when the temperature of the molten steel reaches 1569°C, add 1.2% ferrosilicon (mass The percentage % is: 74.0-80.0Si, ≤0.5Al, ≤1.0Ca, ≤0.035P, ≤0.02S, ≤0.1C, ...

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Abstract

The invention discloses a high-temperature-oxidation-resisting alloy steel and a preparation method thereof. The alloy steel is composed of the raw materials of, by mass, 39.0-41.5% of Q235 waste steel, 25.0-28.0% of stainless steel scrap, 14.0-16.0% of Ni-based alloy scrap, 2.0-2.2% of manganese iron, 8.0-8.5% of high-carbon ferrochrome, 4.5-4.8% of metal aluminum, 1.0-1.2% of ferrosilicon, 1.0-1.2% of ferrotungsten, 0.8-1.0% of yttrium-based heavy rare earth silicon-iron-magnesium alloy, and 0.30-0.45% of silicon-calcium alloy. The alloy steel is processed through electric furnace smelting, casting forming, and 600-650 DEG C heat treatment, and is provided with excellent antioxidant performance.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and relates to an alloy steel and a preparation method thereof, in particular to a high-temperature oxidation-resistant alloy steel and a preparation method thereof. Background technique [0002] Because of its excellent high temperature strength, good oxidation resistance and high temperature corrosion resistance, HP40 alloy is widely used in the petrochemical industry as a key component of cracking furnace tubes. However, recent studies have shown that high nickel content in the HP40 alloy will promote coking on the inner wall of the furnace tube and carburize the inside of the furnace tube, seriously reducing the service life of the furnace tube. It is generally believed that during the high-temperature service of the alloy, the formation of a complete and dense layer of chromium oxide on the surface of the material can effectively protect the matrix and improve the service life of the all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06
Inventor 高义民邢建东皇志富符寒光郑开宏
Owner XI AN JIAOTONG UNIV
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