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Method for remelting high-strength stainless steel

A high-strength, stainless steel technology, applied in the field of atmospheric pressure remelting smelting high-nitrogen stainless steel, remelting high-strength stainless steel, can solve the problems of reducing the recycling value of waste materials, reducing the nitrogen content of high-nitrogen steel, waste of waste materials, etc.

Inactive Publication Date: 2014-01-01
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 200810050792.8 patent application proposed the method of adding high-nitrogen ferrochrome to Fe-Mn melt to smelt high-nitrogen steel under normal pressure, and the 201210458675.1 patent application also proposed the method of adding manganese nitride to Fe-Cr melt to smelt high-nitrogen steel under normal pressure. method, making it possible to produce high nitrogen steel under normal pressure
However, in the process of high-nitrogen steel ingots, castings and processing and production, many high-nitrogen steel waste materials (such as pouring riser materials, intermediate injection pipe materials, material heads, cutting, waste castings, waste products, etc.) will be produced. Its remelting and re-obtaining high-nitrogen steel with higher nitrogen content will reduce the recycling value of waste materials and cause waste of waste materials. Experiments have shown that these high-nitrogen steel waste materials are remelted and solidified under normal pressure or mixed with new molten steel. There will be a large amount of nitrogen escape, which will greatly reduce the nitrogen content of the obtained high nitrogen steel (generally below 0.5wt%), thereby reducing the nitrogen content level of the high nitrogen steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 3700kg of high-nitrogen steel waste materials; prepare about 1300kg of high-nitrogen steel new materials, including 610kg of industrial pure iron, 160kg of ferrochrome nitride, 110kg of high-nitrogen ferrochrome, 160kg of micro-carbon ferrochrome, 240kg of electrolytic manganese metal, and 20kg of manganese nitride .

[0025] Specific smelting steps:

[0026] 1) Add all industrial pure iron and micro-carbon ferrochrome to the intermediate frequency induction furnace, add all electrolytic manganese metal after melting, and adjust the melt temperature to 1450°C;

[0027] 2) Gradually add high-nitrogen steel waste into the furnace to keep the melt temperature at 1450°C until it is completely melted into a melt;

[0028] 3) Gradually add high-nitrogen ferrochrome to the furnace at a rate of 100kg / min and keep the melt temperature at 1450°C;

[0029] 4) Gradually add ferrochromium nitride into the furnace at a rate of 100kg / min, and keep the melt temperature at 1450°C...

Embodiment 2

[0034] Take 1000kg of high-nitrogen steel waste materials; prepare about 4000kg of high-nitrogen steel new materials, including 1870kg of industrial pure iron, 1330kg of ferrochrome nitride, 650kg of electrolytic manganese metal, and 150kg of manganese nitride.

[0035] Melting steps:

[0036] 1) Add all industrial pure iron to the intermediate frequency induction furnace, add all electrolytic manganese metal after melting, and adjust the melt temperature to 1500°C;

[0037] 2) Gradually add high-nitrogen steel waste into the furnace to keep the melt temperature at 1500°C until it is completely melted into a melt;

[0038] 3) Gradually add ferrochromium nitride into the furnace at a rate of 300kg / min, and keep the melt temperature at 1500°C;

[0039] 4) Gradually add manganese nitride into the furnace at a rate of 100kg / min and keep the melt temperature at 1500°C;

[0040] 5) After all the nitrogen-containing alloys are added, keep the melt temperature at 1500°C, and at the ...

Embodiment 3

[0044] Take 2500kg of high-nitrogen steel waste materials; prepare about 2500kg of high-nitrogen steel new materials, including 610kg of industrial pure iron, 490kg of ferrochrome nitride, 160kg of high-nitrogen ferrochrome, 140kg of micro-carbon ferrochrome, and 500kg of electrolytic manganese metal.

[0045] Melting steps:

[0046] 1) Add all industrial pure iron and micro-carbon ferrochrome to the intermediate frequency induction furnace, add all electrolytic manganese metal after melting, and adjust the melt temperature to be between 1480°C;

[0047] 2) Gradually add high-nitrogen steel waste into the furnace to keep the melt temperature between 1550°C until it is completely melted into a melt;

[0048]3) Gradually add high-nitrogen ferrochromium into the furnace at a rate of 100kg / min and keep the melt temperature at 1550°C;

[0049] 4) Gradually add ferrochromium nitride into the furnace at a rate of 200kg / min, and keep the melt temperature at 1550°C;

[0050] 5) After...

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Abstract

The invention relates to a method for remelting high-strength stainless steel. The method is characterized by including the steps that Fe-Mn-Cr nitrogen absorption alloy melt containing manganese and chromium is first smelted, then, high-nitrogen steel waste material is added to the nitrogen absorption alloy melt step by step at low melt temperature, nitrogen-containing alloy is added in proportion according to the designed composition proportion of high-nitrogen steel, and after being completely melted and homogenized, the nitrogen-containing alloy is discharged for pouring. The method solves the problem that the nitrogen content is insufficient in the recovering and remelting processes of the high-nitrogen steel waste material and can control the nitrogen content of new high-nitrogen steel smelted by the high-nitrogen steel waste material to be close to or not lower than that of the original high-nitrogen steel waste material.

Description

technical field [0001] The invention relates to a method for remelting high-strength stainless steel, which is a method for smelting high-nitrogen stainless steel by atmospheric pressure remelting, and belongs to the field of iron and steel smelting. Background technique [0002] High-nitrogen stainless steel (hereinafter referred to as high-nitrogen steel) has attracted attention for its excellent properties such as nickel saving, corrosion resistance, high strength, and high plasticity. As a new type of steel with high strength, toughness and corrosion resistance, it can be obtained in wider and more complex fields. widely used. [0003] High-nitrogen steel (N≥0.6wt%) is difficult to add nitrogen during smelting and easily escapes from the melt to form nitrogen gas, so it is generally smelted under high pressure. Similarly, remelting high-nitrogen steel back into the melt requires Remelting under high pressure is used, otherwise a large amount of nitrogen in the melt will...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22B9/16C21C7/00
CPCY02P10/20
Inventor 王淮杨得超
Owner CHANGCHUN UNIV OF TECH
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