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Method for preparation of high-strength stainless steel by using high alloy melt

A high-strength, stainless steel technology, applied in the field of iron and steel smelting, can solve the problems of limited output, nitrogen escape, nitrogen difficult to add, etc., to achieve the effect of reducing nitrogen escape, high nitrogen content, and less air bubbles

Inactive Publication Date: 2013-12-11
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When smelting high-nitrogen steel, nitrogen is difficult to add and easily escapes from the melt to form nitrogen gas, so it is generally smelted under high pressure, which limits the output
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, experiments have shown that simply mixing low-carbon molten steel into nitrogen-containing alloy liquid will still cause a large amount of nitrogen to escape, making it difficult to obtain high-nitrogen steel with high nitrogen content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of high-nitrogen steel with ferrochromium nitride as the main nitrogen-added alloy:

[0031] The total weight of materials prepared is 5030kg, of which:

[0032] Preparation of Fe-Cr-Mn melt material consists of: industrial pure iron 2400kg, electrolytic manganese metal 800kg, micro-carbon ferrochrome 10kg;

[0033] The composition of the material for preparing the high nitrogen alloy melt is: 1650 kg of ferrochromium nitride, 10 kg of high nitrogen ferrochromium, 10 kg of manganese nitride, and 150 kg of electrolytic manganese metal.

[0034] step:

[0035] 1) Use one of the intermediate frequency induction furnaces to prepare Fe-Cr-Mn melt: first add all industrial pure iron to the furnace, heat up and heat up until part of it is melted, then add micro-carbon ferrochrome, electrolyze metal manganese, continue heating until it is completely melted, Adjust its melt temperature between 1550°C and 1580°C.

[0036] 2) Use another intermediate frequency induc...

Embodiment 2

[0041] Preparation of high-nitrogen steel with high-nitrogen ferrochrome as the main nitrogen-added alloy:

[0042] The total weight of materials prepared is 5050kg, of which:

[0043]Preparation of Fe-Cr-Mn melt materials consists of: electrolytic manganese metal 600kg, micro-carbon ferrochrome 60kg, industrial pure iron 2420kg;

[0044] The material composition for preparing high nitrogen alloy melt is: 1600 kg of high nitrogen ferrochromium, 10 kg of ferrochromium nitride, 10 kg of manganese nitride, and 350 kg of electrolytic manganese metal.

[0045] step:

[0046] 1) The method of preparing the Fe-Cr-Mn melt with an intermediate frequency induction furnace is the same as that in Example 1.

[0047] 2) Prepare high-nitrogen alloy melt with medium-frequency induction furnace: add high-nitrogen ferrochrome, ferrochrome nitride and manganese nitride into the furnace to heat up and heat until they are all melted, then add electrolytic manganese, and adjust the melt temperat...

Embodiment 3

[0052] Preparation of high-nitrogen steel with ferrochromium nitride and manganese nitride as the main nitrogen-added alloy:

[0053] The total weight of materials prepared is 5050kg, of which:

[0054] Preparation of Fe-Cr-Mn melt materials consists of: electrolytic manganese metal 150kg, micro-carbon ferrochrome 400kg, industrial pure iron 2400kg;

[0055] The material composition of the high-nitrogen alloy melt prepared is: 900 kg of ferrochrome nitride, 770 kg of manganese nitride, 50 kg of electrolytic metal manganese, and 380 kg of micro-carbon ferrochrome.

[0056] step:

[0057] 1) The method for preparing the Fe-Cr-Mn melt is the same as that of Example 1.

[0058] 2) Preparation of high-nitrogen alloy melt: Add ferrochrome nitride, manganese nitride and micro-carbon ferrochrome together into the furnace to heat up and heat until they are all melted, then add electrolytic manganese metal, and adjust the melt temperature to between 1500°C and 1550°C between.

[005...

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Abstract

The invention relates to a method for the preparation of high-strength stainless steel by using high alloy melt. The method is characterized by comprising the following steps: firstly, preparing high nitrogen alloy melt and Fe-Cr-Mn melt respectively; then adding the Fe-Cr-Mn melt slowly into the high nitrogen alloy melt; discharging for pouring after temperature controlling and uniform stirring. According to the method, smooth and steady fusing of the high nitrogen alloy melt and the Fe-Cr-Mn melt is facilitated, the escape of nitrogen is obviously reduced, high nitrogen steel melt with higher nitrogen content and better stability can be obtained so as to obtain high nitrogen billet steel with less bubble and high nitrogen content, and the detection for the nitrogen content of the high nitrogen billet steel can be up to 1.0 wt%.

Description

technical field [0001] The invention relates to a method for preparing high-strength stainless steel with a high-alloy melt, which is a method for smelting high-nitrogen stainless steel under normal pressure 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] The main chemical elements of high nitrogen steel are iron (Fe), chromium (Cr), manganese (Mn), nitrogen (N) and a small amount of molybdenum (Mo), copper (Cu), silicon (Si), niobium (Nb), vanadium (V), titanium (Ti), etc., the content of nitrogen element should be ≥ 0.6wt%. When smelting high-nitrogen steel, nitrogen is diffic...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C5/52C21C7/00
CPCY02P10/20
Inventor 王淮孙岩铎
Owner CHANGCHUN UNIV OF TECH
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