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Method for smelting high-strength stainless steel

A stainless steel and high-strength technology, applied in the field of smelting high-strength stainless steel and smelting high-nitrogen stainless steel at atmospheric pressure, can solve the problems of difficult addition of nitrogen, limited output, unstable nitrogen content, etc., to improve nitrogen retention capacity and reduce nitrogen escape , the effect of high nitrogen content

Active Publication Date: 2013-12-18
上海相济新材料科技有限公司
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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, adding high-nitrogen ferrochromium to Fe-Mn melt still has a large amount of nitrogen escape, which requires fast-paced operation, and undissolved high-nitrogen ferrochromium will also be produced due to insufficient nitrogen-dissolving capacity of the solid-liquid surface during pouring and solidification. A large number of nitrogen bubbles cannot escape in time before the melt solidifies, and remain in the billet to form bubble defects, and the nitrogen content is unstable after the ingot is formed, and it takes a long time for solid solution treatment to eliminate nitrides and ferrite; while Fe- The process of adding manganese nitride to Cr melt will also cause a large amount of nitrogen to escape because of its low melting point and instability, and a large amount of manganese will be oxidized. It is also 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

[0020] Preparation of high-nitrogen steel with ferrochromium nitride as the main nitrogen-added alloy:

[0021] The total weight of material preparation is 5030kg, of which:

[0022] The main materials of the basic steel are: industrial pure iron 2400kg, electrolytic manganese 960kg;

[0023] The material for preparing high nitrogen alloy melt is: ferrochromium nitride 1660kg.

[0024] step:

[0025] 1) Prepare high-nitrogen alloy melt with intermediate frequency induction furnace: add all ferrochrome nitride into the furnace and heat up until it is completely melted, then adjust the melt temperature to be between 1600°C and 1650°C.

[0026] 2) Add all the electrolytic manganese metal into the furnace until it is completely melted, and adjust the melt temperature between 1500°C and 1580°C.

[0027] 3) Gradually add industrial pure iron into the furnace at a rate of 1000kg / min, and control the melt temperature between 1500°C and 1560°C.

[0028] 4) After the addition is com...

Embodiment 2

[0032] Preparation of high-nitrogen steel with high-nitrogen ferrochrome as the main nitrogen-added alloy:

[0033] The total weight of materials prepared is 5050kg, of which:

[0034] The main materials of the basic steel are: industrial pure iron 2400kg, electrolytic manganese 975kg;

[0035] The material for preparing the high-nitrogen alloy melt is: 1670kg of ferrochromium nitride.

[0036] step:

[0037] 1) Prepare high-nitrogen alloy melt with intermediate frequency induction furnace: add all high-nitrogen ferrochrome into the furnace and heat up until it is completely melted, then adjust the melt temperature to be between 1600°C and 1650°C.

[0038] 2) Add all the electrolytic manganese metal into the furnace until it is completely melted, and adjust the melt temperature between 1500°C and 1550°C.

[0039] 3) Gradually add industrial pure iron into the furnace, the adding rate is 800kg / min, and the melt temperature is controlled between 1500°C and 1550°C.

[0040] 4...

Embodiment 3

[0044] High-nitrogen ferrochrome 50wt% and ferrochromium nitride 50wt% are the main nitrogen-added alloys to prepare high-nitrogen steel:

[0045] The total weight of materials prepared is 5050kg, of which:

[0046] The main materials of the basic steel are: industrial pure iron 2400kg, electrolytic manganese metal 975kg.

[0047] The materials for preparing the high-nitrogen alloy melt are: 835kg of ferrochromium nitride and 835kg of high-nitrogen ferrochromium.

[0048] step:

[0049] 1) Prepare high-nitrogen alloy melt with medium-frequency induction furnace: add ferrochrome nitride and high-nitrogen ferrochrome into the furnace and heat up until they are completely melted, then adjust the melt temperature between 1600°C and 1650°C.

[0050] 2) Add all the electrolytic manganese into the furnace until it is completely melted, and adjust the melt temperature between 1500°C and 1540°C.

[0051]3) Gradually add industrial pure iron into the furnace, the adding rate is 600kg...

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PUM

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Abstract

The invention relates to a method for smelting high-strength stainless steel, which is characterized by comprising the following steps: firstly, smelting a high-nitrogen alloy melt; then, adding a base steel material into the high-nitrogen alloy melt; and finally, after the high-nitrogen alloy melt is completely melted and homogenized, taking the obtained product out of a furnace and pouring the obtained product. According to the invention, the smooth fusion of a high-nitrogen alloy and a base steel material is facilitated, the escape of nitrogen is significantly reduced, and a high-nitrogen steel melt with a high and stable nitrogen content can be obtained, thereby obtaining a high-nitrogen steel billet with less air bubbles and a high nitrogen content, and through detecting, the maximum nitrogen content can reach 0.90 wt %.

Description

technical field [0001] The invention relates to a method for smelting high-strength stainless steel, 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 difficult to add and easily e...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/38
Inventor 王淮孙岩铎
Owner 上海相济新材料科技有限公司