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Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel

A high-aluminum steel and aluminum nitride technology, which is applied in the field of reducing the hazards of aluminum nitride inclusions in high-aluminum steels, can solve the problems of high cost and increase of vacuum smelting equipment, etc., to reduce hazards, prevent microcracks, and improve The effect of hardness and tensile strength

Active Publication Date: 2021-07-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to increase the vacuum smelting equipment, the cost is high, and the addition of nitrogen in the molten steel cannot be avoided during the casting process after the smelting is completed. This method is difficult to fundamentally solve the problems caused by aluminum nitride inclusions

Method used

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  • Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel
  • Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel
  • Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel

Examples

Experimental program
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Embodiment 1

[0039] This embodiment provides a method for reducing the harmfulness of aluminum nitride inclusions in high aluminum steel, including the following steps:

[0040] S1. Prepare 35kg of industrial pure iron, 360g of graphite rod, 10.64kg of electrolytic manganese, 5.3kg of aluminum pellets and 10g of sulfur iron as raw materials for preparing high-aluminum steel; wherein, the manganese content is about 20.74%, and the sulfur content is about 0.01%. .

[0041] S2. Put industrial pure iron and graphite rods into a prefabricated magnesia crucible, and put electrolytic manganese, aluminum particles and iron sulfur into a feed bin. Vacuumize the induction furnace to 6Pa, and then raise the temperature to 1600°C to melt the industrial pure iron and graphite rods, then pass argon into the induction furnace, and add electrolytic manganese through the silo. After the electrolytic manganese is completely melted, then Aluminum pellets are added through the silo. After refining for 10 mi...

Embodiment 2～3 and comparative example 1～2

[0044] Embodiments 2-3 and Comparative Examples 1-2 respectively provide a method for reducing the harmfulness of aluminum nitride inclusions in high-aluminum steel. Compared with Example 1, the difference is that the added amount of sulfur iron is changed, The rest of the steps are the same as those in Embodiment 1, and will not be repeated here. The corresponding iron sulfur addition amount and the sulfur content in the high-aluminum steel in each embodiment and comparative example are shown in Table 1 respectively.

[0045] Table 1 Examples 2-3 and comparative examples 1-2 correspond to the amount of iron sulfur added and the sulfur content in high-alumina steel

[0046] Example / Comparative example Amount of iron sulfur added (g) Sulfur content in high aluminum steel (%) Example 2 20 0.02 Example 3 30 0.03 Comparative example 1 3 0.003 Comparative example 2 40 0.04

[0047] In order to test the reduction degree of the harmfulne...

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Abstract

The invention provides a method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel. The method for reducing the harmfulness of the aluminum nitride inclusions in the high-aluminum steel comprises the steps that industrial pure iron and a graphite rod are melt in advance, and then a manganese-containing raw material and an aluminum-containing raw material are sequentially added for smelting; a preset amount of sulfur-containing raw material is added to obtain molten steel after the manganese-containing raw material and the aluminum-containing raw material are completely melted down; and then the molten steel is cast into a model to obtain the high-aluminum steel with the low harmfulness of the aluminum nitride inclusions. Through the mode, the sulfur content in the components of the high-aluminum steel can be regulated and controlled, and brittle aluminum nitride inclusions are fully wrapped by plastic manganese sulfide inclusions by utilizing the higher deformability of the formed manganese sulfide inclusions, so that the harmfulness of the aluminum nitride inclusions in the high-aluminum steel is reduced. The method for reducing the harmfulness of the aluminum nitride inclusions in the high-aluminum steel is easy to operate and wide in application range, the number of pure aluminum nitride inclusions in the high-aluminum steel can be effectively reduced, the hardness and tensile strength of the high-aluminum steel can be improved, and the method has high practical application value.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for reducing the harmfulness of aluminum nitride inclusions in high-aluminum steel. Background technique [0002] High aluminum steel generally has high surface hardness, wear resistance, excellent plasticity, toughness and other mechanical properties, and its aluminum content is usually more than 1%, including high manganese high aluminum low density steel, TRIP steel, TWIP steel, electrical steel , Fe-Cr-Al stainless steel, etc. In recent years, in order to meet the lightweight requirements in the field of automobile manufacturing, high-manganese and high-aluminum steel with high strength and plasticity and low density has become a popular steel type. Huge application potential. [0003] However, the high content of aluminum is easy to combine with nitrogen during the smelting process to form aluminum nitride inclusions. Moreover, aluminum nitride ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/00
CPCC22C33/04C21C7/0006
Inventor 朱航宇王蓝卿李建立彭其春宋明明薛正良
Owner WUHAN UNIV OF SCI & TECH