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Heat-resistant steel used for ethylene cracking furnace tube material, and preparation method for ethylene cracking furnace tube

An ethylene cracking furnace and heat-resistant steel technology are applied in the field of heat-resistant steel to achieve good high-temperature mechanical properties, improved service life, and good oxidation resistance.

Inactive Publication Date: 2013-12-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, there is a big gap between the development level of new heat-resistant steel materials at home and abroad.

Method used

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  • Heat-resistant steel used for ethylene cracking furnace tube material, and preparation method for ethylene cracking furnace tube

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Effect test

Embodiment 1

[0028] 1) The chemical composition of the heat-resistant steel used for the material of the heat-resistant steel ethylene cracking furnace tube in this embodiment, the composition in weight percentage is: 0.5C, 1.5Si, 1.5Mn, 30Cr, 20Ni, 0.5Nb, 0.1 rare earth Ce, S≤ 0.03%, P≤0.03%, the rest is Fe.

[0029] 2) Calculate and weigh the above-mentioned raw materials for heat-resistant steel smelting: steel scrap, ferromanganese and ferrosilicon, ferrochromium, pure nickel, ferroniobium, and rare earth cerium, and make batches.

[0030] 3) Heat scrap steel in an electric furnace to 1400°C to melt. After the molten steel is melted, ferromanganese and ferrosilicon are added in turn to make the temperature reach 1500°C. After deoxidizing with aluminum wire, pure nickel, ferroniobium, and After ferrochrome, make the temperature of molten steel reach 1600℃ at this time, deoxidize with aluminum wire again and remove slag on the liquid surface of molten steel, then quickly pour molten stee...

Embodiment 2

[0035] 1) The chemical composition of the heat-resistant steel used for the material of the heat-resistant steel ethylene cracking furnace tube in this embodiment, the composition in weight percentage is: 1.5C, 0.5Si, 0.5Mn, 35Cr, 15Ni, 0.1Nb, 0.05 rare earth Ce, S≤ 0.03%, P≤0.03%, the rest is Fe.

[0036] 2) Calculate and weigh the above-mentioned raw materials for heat-resistant steel smelting: steel scrap, ferromanganese and ferrosilicon, ferrochromium, pure nickel, ferroniobium, and rare earth cerium, and make batches.

[0037]3) Heat scrap steel in an electric furnace to 1400°C and melt it. After the molten steel is melted, ferromanganese and ferrosilicon are added in turn to make the temperature reach 1500°C. After deoxidizing with aluminum wire, pure nickel, ferroniobium, After ferrochrome, the temperature of the molten steel reaches 1600°C at this time, and the aluminum wire is used to deoxidize again, and the slag is removed on the liquid surface of the molten steel, ...

Embodiment 3

[0042] 1) The chemical composition of the heat-resistant steel used for the material of the heat-resistant steel ethylene cracking furnace tube in this embodiment, in terms of weight percentage, is: 1.0C, 1.2Si, 1.2Mn, 32Cr, 18Ni, 0.25Nb, 0.08 rare earth Ce, S≤ 0.03%, P≤0.03%, the rest is Fe.

[0043] 2) Calculate and weigh the above-mentioned raw materials for heat-resistant steel smelting: steel scrap, ferromanganese and ferrosilicon, ferrochromium, pure nickel, ferroniobium, and rare earth cerium, and make batches.

[0044] 3) Heat scrap steel in an electric furnace to 1400°C and melt it. After the molten steel is melted, ferromanganese and ferrosilicon are added in turn to make the temperature reach 1500°C. After deoxidizing with aluminum wire, pure nickel, ferroniobium, After ferrochrome, the temperature of the molten steel reaches 1600°C at this time, and the aluminum wire is used to deoxidize again, and the slag is removed on the liquid surface of the molten steel, and ...

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Abstract

The invention discloses heat-resistant steel used for an ethylene cracking furnace tube material, and a preparation method for an ethylene cracking furnace tube. The heat-resistant steel comprises the following components by weight: 0.5-1.5% of C, 0.5-1.5% of, 0.5-1.5% of Mn, 30-35% of Cr, 15-20% of Ni, 0.1-0.5% of Nb, 0.05-0.1% of rare earth Ce, smaller than or equal to 0.03% of S, smaller than or equal to 0.03% of P, and the balance being Fe. By changing chemical components, the ethylene cracking furnace tube with the outer layer being austenite and a small amount of Cr7C3 type carbide and the inner layer being Cr7C3 type carbide and a trace of the austenite can be prepared by using a centrifugal casting method accompanied by a certain heat treatment process.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant steel, and relates to a heat-resistant steel for an ethylene cracking furnace, in particular to a heat-resistant steel for an ethylene cracking furnace tube material and a preparation method for the ethylene cracking furnace tube. Background technique [0002] The corrosion resistance environment of heat-resistant steel as ethylene cracking furnace tube in heavy oil smelting equipment is very harsh. The service temperature is about 923 ~ 1423K or even higher, and there are multiple factors such as vulcanization + carburization + oxidation and other interactive erosion and coking effects. In addition to requiring heat-resistant steel to have good high-temperature mechanical properties (such as creep limit and durable strength), it also needs excellent resistance to complex media erosion. At present, foreign heat-resistant steel furnace tube materials and preparation technologies are mostly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C33/06B22D13/02C10G9/20
Inventor 皇志富高义民邢建东马胜强李烨飞符寒光
Owner XI AN JIAOTONG UNIV
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