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Common Ni-based high temperature alloy in petro-chemical industry

A nickel-based superalloy and petrochemical technology, which is applied in the field of metallurgical industry, can solve the problems of insufficient service life, coarse alloy structure, and easy inclusion of grain boundaries, etc., and achieve the effects of improving service life, stabilizing structure and saving energy

Inactive Publication Date: 2010-02-03
黄石山力大通热工设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, most of these products were made of HK-40 (ZG40Cr25Ni20) or HP (ZG40Ni35Cr25), but this type of alloy has a coarse structure, easy inclusion of grain boundaries, easy deformation, poor thermal stability, and easy carburization, and the service life of the product cannot reach Require

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  • Common Ni-based high temperature alloy in petro-chemical industry

Examples

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Comparison scheme
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example 1

[0011] Example 1: Using a 500kg intermediate frequency induction furnace for smelting, the chemical composition weighed according to the design of the present invention is: C 2.0kg, Si 5.0kg, Mn 4.0kg, P 0.01kg, S 0.01kg, Cr120.00kg, Ni 170.00kg, Nb 4.0 kg, Mo 0.5kg, Ti 0.15kg, Zr 0.15kg, the rest is Fe and unavoidable trace impurities. Put all the ingredients into the furnace and melt them, then take samples to analyze the content of the ingredients, and heat up the slag, deoxidize and other work. If there is a deviation in the composition, the composition should be adjusted until the composition is qualified, the molten steel is well deoxidized, and the steel preparation can be made after the temperature meets the process requirements. Microalloying treatment can be added to the furnace and ladle when tapping.

[0012] The comprehensive properties of this alloy are shown in the table below:

[0013]

[0014] Applying the alloy of the present invention, the horizontal ce...

example 2

[0015] Example 2: Melting in a 500kg intermediate frequency induction furnace, weighing the chemical composition according to the design of the present invention: C 2.50kg, Si 7.50kg, Mn 6.60kg, P 0.10kg, S 0.10kg, Cr 130.00kg, Ni 175.00kg, Nb 6.0kg, Mo 1.25kg, Ti 0.5kg, Zr0.5kg, the rest is Fe and unavoidable trace impurities. After all the ingredients are melted in the furnace, samples can be taken to analyze the content of the ingredients, and the temperature is raised to slag and deoxidize. If there is a deviation in the composition, the composition should be adjusted until the composition is qualified, the molten steel is well deoxidized, and the steel preparation can be made after the temperature meets the process requirements. Microalloying treatment can be added to the furnace and ladle when tapping.

example 3

[0016] Example 3: Using a 500kg intermediate frequency induction furnace for smelting, the chemical composition weighed according to the design of the present invention is: C 3.0kg, Si 10.00kg, Mn 10.00kg, P 0.13kg, S 0.13kg, Cr 140.00kg, Ni 185.00kg, Nb 7.50 kg, Mo 2.5kg, Ti 1.00kg, Zr1.00kg, the rest is Fe and unavoidable trace impurities. After all the ingredients are melted in the furnace, samples can be taken to analyze the content of the ingredients, and the temperature is raised to slag and deoxidize. If there is a deviation in the composition, the composition should be adjusted until the composition is qualified, the molten steel is well deoxidized, and the steel preparation can be made after the temperature meets the process requirements. Microalloying treatment can be added to the furnace and ladle when tapping.

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Abstract

The invention relates to a common Ni-based high temperature alloy in petro-chemical industry, which comprises the following chemical components in percentage by weight: 0.40 to 0.60 percent of C, 1.00to 2.00 percent of Si, 0.80 to 2.00 percent of Mn, less than 0.03 percent of P, less than 0.03 percent of S, 24.00 to 28.00 percent of Cr, 34.00 to 37.00 percent of Ni, 0.80 to 1.50 percent of Nb, less than or equal to 0.50 percent of Mo, 0.03 to 0.20 percent of Ti, 0.03 to 0.20 percent of Zr, and the balance of Fe and trace impurities. By adjusting alloy content, the common Ni-based high temperature alloy in petro-chemical industry has a more stable matrix structure and improved heat resistance; compared with the steel for producing prior like products, the common Ni-based high temperature alloy in petro-chemical industry has remarkably improved properties in corrosion resistance, carburizing resistance, oxidation resistance, high temperature resistance, creep resistance and the like, and is mainly applied to the high temperature device pyrolyzing furnaces, reforming furnaces, furnace tubes and pipe fittings in the petrochemical industry, continuous type annealing furnace radiating tubes and furnace rollers in the metallurgical industry, and spare parts bearing high temperature in other industries.

Description

(1) Technical field: [0001] The invention relates to the metallurgical industry, and is a nickel-based superalloy commonly used in petrochemical metallurgy. (two) background technology: [0002] Cracking furnace tubes, reforming furnace tubes, pipe fittings, etc. in high-temperature devices of petrochemical systems; heat treatment furnaces in various continuous annealing lines in metallurgical systems, radiant tubes in annealing furnaces in galvanizing lines, various high-temperature conveyor rollers and high-temperature components, etc. These products must withstand high temperature, high pressure, corrosion resistance, carburization resistance and other requirements, and at the same time be used for a long time in the harsh environment of high temperature. In the past, most of these products were made of HK-40 (ZG40Cr25Ni20) or HP (ZG40Ni35Cr25), but this type of alloy has a coarse structure, easy inclusion of grain boundaries, easy deformation, poor thermal stability, and...

Claims

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Application Information

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IPC IPC(8): C22C19/05
Inventor 李土振吴永华宋洋溢阮志刚
Owner 黄石山力大通热工设备有限公司
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