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Method of smelting high nitrogen steel using additional cathode glow discharging

A cathode glow discharge, smelting high nitrogen steel technology, applied in electric furnaces, furnaces, furnace types and other directions, can solve the problems of heat loss, difficult manufacturing and installation, affecting the total nitrogen content of the melt, etc., to avoid heat loss , the effect of low cost and high penetration speed

Inactive Publication Date: 2006-04-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following problems: ① there is a non-arc zone for denitrification, which affects the increase of the total nitrogen content in the melt; There will be a lot of heat loss; ③Because the melt is used as the cathode, the connection between the cathode and the power supply needs to use a refractory conductor material, which is difficult to manufacture and install

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put the smelting crucible in a sealed container, and put pure iron in the crucible as the smelting raw material. The heating source is induction heating, and its principle is the same as that of the vacuum induction melting furnace. An anode is set above the liquid surface of the crucible, and a pure iron plate with holes is set between the anode and the crucible to connect with the additional cathode of the power supply. The crucible is at a floating potential not connected to the additional cathode and anode. After the charge is melted and refined by the conventional vacuum induction smelting method, pure nitrogen gas is introduced into the vacuum induction smelting furnace, and the vacuum degree is adjusted to 10000Pa. Connect the power supply of the anode and the additional cathode, and the voltage adjustment range of the power supply is 3×10 2 V-1×10 4 V, gradually adjust the power supply voltage from low to high. While adjusting the voltage, observe the surface ...

Embodiment 2

[0017] An anode is arranged above the liquid surface of the melt in the inner space of the vacuum arc melting furnace, and a graphite plate with holes is arranged between the anode and the liquid surface, and is connected with an additional cathode of a power supply. Using scrap steel, ferrochromium and ferromolybdenum as raw materials, the furnace material is melted, refined and alloyed according to the conventional vacuum arc smelting method, and then nitrogen-containing gas is introduced into the furnace, and the vacuum degree is adjusted to 40Pa. Turn on the power supply of the anode and the additional cathode, the voltage adjustment range is 50V-1500V, gradually adjust the power supply voltage from low to high, and observe the surface of the additional cathode from the observation hole while adjusting the voltage, when glow discharge occurs, it indicates that it has reached Ignite the voltage, and then continue to increase the power supply voltage. When it is observed that...

Embodiment 3

[0019] An anode plate is set above the liquid surface in the high-energy beam vacuum melting furnace. The anode plate is a conical surface at a certain angle. A stainless steel plate with holes is set between the anode and the crucible as an additional cathode. The liquid metal alloy is at the same or a different negative potential than the additional cathode. Using stainless steel scrap, nickel and chromium as raw materials, according to the conventional high-energy beam vacuum smelting method, after heating, melting, refining and alloying, the nitrogen-containing gas is introduced into the furnace, and the vacuum degree is adjusted to 1000Pa. Turn on the power supply of the anode and the additional cathode, and the voltage adjustment range is 300V-3000V, gradually adjust the power supply voltage from low to high, and observe the surface of the additional cathode from the observation hole while adjusting the voltage. When glow discharge occurs, it indicates that it has reached...

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Abstract

A technology for smelting high-nitrogen steel by additional cathode glow discharge includes such steps as arranging an anode above the liquid level of smelting bath in vacuum smelting apparatus, arranging a perforated additional cathode between said anode and liquid level, vacuum smelting while regulating the contents of alloying elements, filling N-contained gas, applying a voltage across the anode and cathode to ionize the N atoms into N ions, regulating voltage to form a stable glow region to deposit the N ions, active N atoms and mitride from cathode on the liquid surface, and diffusing and counterflowing to increase the content of N in steel.

Description

technical field [0001] The invention relates to a method in the technical field of metal smelting, in particular to a method for smelting high-nitrogen steel with additional cathode glow discharge. Background technique [0002] Ferrite-based steels containing more than 0.08% nitrogen and austenite-based steels containing more than 0.4% nitrogen are called high-nitrogen steels. The current high-nitrogen steel smelting technology mainly adopts two methods of alloying molten steel by adding solid nitrogen-containing materials or alloying with high-pressure gas nitrogen. The former has unstable absorption of nitrogen and will introduce pollution to steel; the latter should be smelted and poured with high-pressure equipment or reverse pressure casting to prevent the precipitation of nitrogen during solidification. Due to the great technical difficulty, Fe-N binary high-nitrogen alloys with a nitrogen content of more than 1% have not been smelted so far in the world. [0003] Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/00
Inventor 单爱党潘健生陈乃录张伟民
Owner SHANGHAI JIAO TONG UNIV
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