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Method for adding nitrogen element into smelting molten steel of vacuum induction furnace

A vacuum induction furnace and nitrogen element technology, applied in the field of iron and steel smelting, can solve the problems of difficult control, difficult to precisely control the content, and high requirements, and achieve the effects of simple and reliable method and stable recovery rate

Inactive Publication Date: 2012-04-04
LUOYANG SHUANGRUI SPECIAL ALLOY MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for adding nitrogen to molten steel in a vacuum induction furnace, which overcomes the defects of high technical requirements for adding nitrogen in vacuum smelting, difficult control, and difficulty in precisely controlling its content.

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  • Method for adding nitrogen element into smelting molten steel of vacuum induction furnace
  • Method for adding nitrogen element into smelting molten steel of vacuum induction furnace

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Embodiment 1

[0043] The equipment in this embodiment adopts ZG-0.05 high vacuum induction furnace: the ultimate vacuum is 6.67×10-3Pa, the power supply is 120kW, the frequency is 2500Hz, and the furnace load is 60kg.

[0044] The steel composition is C: 0.05%, Si: 0.15%, Mn: 5.5%, Ni: 24.30%, Cr: 18.60%, N: 0.17%, and the rest is Fe and unavoidable impurities.

[0045] The weights of pure iron, alloys and ferrochromium nitride required for smelting steel with more than one furnace composition in this embodiment are shown in Table 2, and the control range and control target of steel composition are shown in Table 3.

[0046] Table 2 Types and amounts of raw materials for smelting steel

[0047] Raw material type Silicon metal manganese metal Metal nickel metal chrome Ferrochromium Nitride pure iron Amount added, kg 0.09 3.30 14.58 10.14 1.70 Remain

[0048] Table 3 Composition of smelted steel grades wt%

[00...

Embodiment 2

[0074] The equipment in this embodiment adopts ZG-0.05 high vacuum induction furnace: the ultimate vacuum degree is 6.67×10 -3 Pa, the power supply is 120kW, the frequency is 2500Hz, and the furnace load is 65kg.

[0075] The steel composition is C: 0.06%, Si: 0.55%, Mn: 6.0%, Ni: 25.0%, Cr: 19.0, N: 0.02%, and the rest is Fe and unavoidable impurities.

[0076] The weights of pure iron, alloys and ferrochromium nitride required for smelting steel with more than one furnace composition in this embodiment are shown in Table 5, and the control range and control target of steel composition are shown in Table 6.

[0077] Table 5 Types and amounts of raw materials for smelting steel

[0078] Raw material type Silicon metal manganese metal Metal nickel metal chrome Ferrochromium Nitride pure iron Amount added, kg 0.351 3.9 16.25 10.32 3.358 Remain

[0079] Table 6 Composition of smelted steel grades wt%

[0080]

[...

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Abstract

The invention relates to a method for adding a nitrogen element into smelting molten steel of a vacuum induction furnace. The method comprises the following steps of: when a steel grade into which the nitrogen element is needed to be added is smelted in the vacuum induction furnace, adding nitrogen-containing iron alloy which does not damage the quality of molten steel into a hopper; and after the molten steel is subjected to high vacuum refining and deoxidized fully, introducing argon into the furnace and an ingot mold, adding the nitrogen-containing iron alloy for deoxidizing finally, tapping and pouring. The method is simple and reliable; and after furnace charges are molten completely, refined and deoxidized, and the nitrogen-containing iron alloy is added under the protective atmosphere of the argon and is deoxidized finally, the molten steel is tapped and poured, so the aim of adding the nitrogen element accurately at low cost is fulfilled, the content of the nitrogen element can be controlled accurately, and the recovery rate is stabilized to be over 65 percent.

Description

technical field [0001] The invention relates to a steel smelting technology, in particular to a method for adding nitrogen element to molten steel in a vacuum induction furnace. Background technique [0002] Nitrogen has become an important additive element in steel. Nitrogen dissolved in steel plays a significant role in improving its strength, toughness and corrosion resistance. [0003] There are many ways to add nitrogen to molten steel. The published relevant patents on how to add nitrogen are now respectively. [0004] The application number is 200710121276.5, and the title is "A Method for Smelting High-Nitrogen Steel under Normal Pressure". [0005] The application number is 200810011052.3, and the title is "A method for smelting high-nitrogen steel in a pressurized electroslag furnace". The raw materials for adding nitrogen are nitrogen alloy grains and deoxidizers, and the process method is to weld nitrogen alloy grains on the base metal Made of consumable comp...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/00
Inventor 冯兆龙薛旭斌李孟轩
Owner LUOYANG SHUANGRUI SPECIAL ALLOY MATERIALS
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