NiCrNb-Re high-temperature-resistance and corrosion-resistance welding wire for ethylene cracking furnace cast pipes and preparation method thereof

An ethylene cracking furnace, high temperature resistant technology, used in welding equipment, welding media, manufacturing tools, etc., can solve the problem of poor oxidation resistance and corrosion resistance of furnace tubes, a large amount of waste gas, waste liquid and solid waste, affecting wire feeding And arc stability and other issues, to ensure high temperature mechanical properties, improve high temperature resistance and oxidation resistance, excellent welding process and mechanical properties.

Inactive Publication Date: 2019-06-18
DANYANG XINHANG SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ethylene cracking furnace tube generally uses Cr25Ni20 or Cr25Ni35Nb, the welding process is mature and easy to master, but the furnace tube has poor oxidation resistance and corrosion resistance, and the service life is short
The newly developed Cr35Ni45Nb high-nickel chromium ethylene cracking furnace cast pipe can replace the original material and solve the bottleneck problem of the existing technology, but its development and application are greatly restricted due to the lack of matching welding materials.
[0003] In addition, during the manufacturing process of the existing nickel alloy welding wire, the surface scale is usually removed by pickling, but a large amount of waste gas, waste liquid and solid waste will be generated, which will seriously pollute the surrounding environment. At the same time, the surface finish of the welding wire is not good, which will affect welding. Process wire feed and arc stability

Method used

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  • NiCrNb-Re high-temperature-resistance and corrosion-resistance welding wire for ethylene cracking furnace cast pipes and preparation method thereof
  • NiCrNb-Re high-temperature-resistance and corrosion-resistance welding wire for ethylene cracking furnace cast pipes and preparation method thereof
  • NiCrNb-Re high-temperature-resistance and corrosion-resistance welding wire for ethylene cracking furnace cast pipes and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040]A NiCrNb-Re high-temperature-resistant and corrosion-resistant welding wire for ethylene cracking furnace casting pipes and its preparation method, the components in the welding wire and their weight percentages are: Ni: 45%, Cr: 35%, Nb: 1.00%, Ce: 0.05%, C: 0.35%, Si: 0.50%, Mn: 1.50%, Al: 0.01%, Ti: 0.05%, Zr: 0.05%, and the balance is Fe and unavoidable impurities. The particle size of each powder in the welding wire is between 60 and 100 mesh. Concrete preparation steps are as follows:

[0041] (1) Alloy smelting: The raw materials are put into the vacuum induction furnace for smelting according to the ratio, and the vacuum degree needs to reach 6.5×10 -2 Above Pa, and cast into electrode rod;

[0042] (2) Electroslag remelting: Using electroslag remelting equipment, the surface of the electrode rod described in step (1) is ground and treated as an electrode and inserted into the slag for remelting, and the slag is remelted using CaF 2 -Al 2 o 3 -CaO slag syste...

Embodiment 2

[0049] A NiCrNb-Re high-temperature-resistant and corrosion-resistant welding wire for ethylene cracking furnace casting pipes and its preparation method, the components in the welding wire and their weight percentages are: Ni: 46%, Cr: 36%, Nb: 1.00%, Y: 0.10%, C: 0.30%, Si: 1.00%, Mn: 2.00%, Al: 0.05%, Ti: 0.15%, Zr: 0.05%, and the balance is Fe and unavoidable impurities. The particle size of each powder in the welding wire is between 60 and 100 mesh. Concrete preparation steps are as follows:

[0050] (1) Alloy smelting: The raw materials are put into the vacuum induction furnace for smelting according to the ratio, and the vacuum degree needs to reach 6.5×10 -2 Above Pa, and cast into electrode rod;

[0051] (2) Electroslag remelting: Using electroslag remelting equipment, the surface of the electrode rod described in step (1) is ground and treated as an electrode and inserted into the slag for remelting, and the slag is remelted using CaF 2 -Al 2 o 3 -CaO slag syste...

Embodiment 3

[0058] A NiCrNb-Re high-temperature-resistant and corrosion-resistant welding wire for ethylene cracking furnace casting pipes and its preparation method. The components in the welding wire and their weight percentages are: Ni: 46%, Cr: 38%, Nb: 1.20%, La: 0.10%, C: 0.40%, Si: 0.50%, Mn: 2.00%, Al: 0.02%, Ti: 0.20%, Zr: 0.05%, and the balance is Fe and unavoidable impurities. The particle size of each powder in the welding wire is between 60 and 100 mesh. Concrete preparation steps are as follows:

[0059] (1) Alloy smelting: The raw materials are put into the vacuum induction furnace for smelting according to the ratio, and the vacuum degree needs to reach 6.5×10 -2 Above Pa, and cast into electrode rod;

[0060] (2) Electroslag remelting: Using electroslag remelting equipment, the surface of the electrode rod described in step (1) is ground and treated as an electrode and inserted into the slag for remelting, and the slag is remelted using CaF 2 -Al 2 o 3 -CaO slag syst...

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Abstract

The invention discloses a NiCrNb-Re high-temperature-resistance and corrosion-resistance welding wire for ethylene cracking furnace cast pipes and a preparation method thereof, and belongs to the field of welding materials. The welding wire comprises the following components in percentage by weight: 45-50% of Ni, 35-40% of Cr, 1.00-1.50% of Nb, 0.01-0.10% of Re, 0.30-0.55% of C, 0.50-2.00% of Si,1.00-2.00% of Mn, 0.01-0.10% of Al, 0.05-0.20% of Ti, 0.01-0.10% of Zr, and the balance of Fe and inevitable impurities. The preparation method comprises the steps of alloy smelting-electroslag remelting-blooming by hot forging-hot-rolled annealing-mechanical stripping-diameter reduction by drawing-straightening and cutting or precise layer winding. The preparation method is environmentally friendly, free of acid washing pollution, stable in welding arc, free of splashing, beautiful in welding line molding, excellent in welding process and mechanical performance and dense in welding line structure, and can totally meet high-temperature-resistance and corrosion-resistance welding requirements of the ethylene cracking furnace cast pipes.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a NiCrNb-Re high-temperature-resistant and corrosion-resistant welding wire for casting pipes of an ethylene cracking furnace and a preparation method thereof. technical background [0002] The ethylene industry is an important symbol to measure the development level of the country's petrochemical industry. The ethylene cracking furnace is the core equipment of the ethylene production plant. The furnace tube in the radiant section of the cracking furnace is the key to the equipment because it is subjected to severe temperature and corrosion conditions. Once it fails or even explodes, it will seriously affect the long-term safe operation of the entire plant, ensuring cracking The welding quality of the furnace radiation furnace tube is particularly critical. The ethylene cracking furnace tube is generally made of Cr25Ni20 or Cr25Ni35Nb. The welding process is mature and easy to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
Inventor 朱新军张天理
Owner DANYANG XINHANG SPECIAL ALLOY
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