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High-manganese steel liquid purification method, high-manganese steel and application of high-manganese steel

A high-manganese steel and molten steel technology, applied in the field of high-manganese steel, can solve the problems of rare earth waste, incomplete melting, uneven distribution of additives, etc., and achieve the effect of reducing the content of impurity elements and the number of inclusions, and improving fatigue performance

Active Publication Date: 2020-11-20
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this ladle flushing method has very high requirements on rare earth / modifier particle size, molten steel flushing speed, and molten steel temperature, which may easily lead to uneven distribution of additives at the bottom of the ladle in molten steel, or even failure to completely melt them. Risk, not only can not play a role in purification, but also deteriorate the mechanical properties of high manganese steel
In addition, the rare earth added to the steel only acts as a modifier, resulting in a serious waste of rare earth

Method used

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  • High-manganese steel liquid purification method, high-manganese steel and application of high-manganese steel

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Effect test

Embodiment 1

[0028] The high manganese steel is smelted in an electric arc furnace, and the high manganese steel molten steel is poured into two 10-ton ladles of the same capacity when the steel is tapped at 1500°C, which are respectively recorded as No. 1 ladle and No. 2 ladle. Ladle No. 1 is used to produce high manganese steel frogs according to the conventional deoxidation and casting process (using aluminum wire for deoxidation operation, and the casting process is common casting). After the No. 2 ladle is poured into molten steel, high-purity nitrogen gas is introduced into the bottom of the ladle immediately, and the nitrogen pressure is kept at 0.4MPa. First, feed silicon-aluminum-barium-calcium alloy wire with a diameter of 13mm into the molten steel, the amount added is 10m per ton of steel, and the wire feeding speed is 10m / s to complete the deoxidation treatment of the high manganese steel molten steel. Then feed the special heavy rare earth alloy wire with a diameter of 13mm i...

Embodiment 2

[0035] The high-manganese steel is smelted in an electric arc furnace, and the molten steel is poured into two ladles of the same capacity when the steel is tapped at 1495°C, which are respectively recorded as No. 1 ladle and No. 2 ladle. Ladle No. 1 is used to produce high manganese steel frogs according to the conventional deoxidation and casting process (using aluminum wire for deoxidation operation, and the casting process is common casting). After the No. 2 ladle is poured into molten steel, high-purity nitrogen gas is introduced into the bottom of the ladle immediately, and the nitrogen pressure is kept at 0.5MPa. Firstly, feed silicon-aluminum-barium-calcium alloy wire with a diameter of 13mm into the molten steel, the amount added is 11m per ton of steel, and the wire feeding speed is 9m / s to complete the deoxidation treatment of the high manganese steel molten steel. Then feed the special heavy rare earth alloy wire with a diameter of 13mm into the molten steel. The c...

Embodiment 3

[0042] The high manganese steel is smelted in an electric arc furnace, and the high manganese steel molten steel is tapped at 1500°C. The deoxidation operation is to insert pure aluminum to remove oxygen. The insertion amount is 1.2kg / ton of steel. During the deoxidation process, nitrogen is not blown into the ladle. Then feed the special heavy rare earth alloy wire with a diameter of 13mm into the molten steel. The chemical composition (wt.%) of the heavy rare earth alloy is RE: 42% (wherein Y accounts for 60% of the total rare earth, La accounts for 15%, Ce 25%), Si: 6%, Al: 13%, Ba: 10%, Ca: 11%, and the balance is Fe. The addition amount of heavy rare earth alloy wire is 11m per ton of steel, and the addition speed is 6m / s. When the molten steel cools down to 1450°C, start casting high manganese steel frogs. Manufacture high manganese steel frog casting cavity by fat hardening molding process. After testing, the chemical composition (wt.%) of the cast high manganese stee...

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Abstract

The invention provides a high-manganese steel liquid purification method, high-manganese steel and application of the high-manganese steel. High-manganese steel liquid is subjected to deoxidation operation by using a silicon-aluminum-barium-calcium alloy, and after completion, a heavy rare earth alloy is added into the steel liquid so as to achieve the purpose of purifying and microalloying the steel liquid. According to the high-manganese steel liquid purification method, the product and application thereof, a silicon-aluminum-barium-calcium alloy wire is used for deoxidation treatment in advance, so that the beneficial effect of heavy rare earth treatment is guaranteed, the rare earth loss is reduced, and the rare earth yield is improved; blowing nitrogen and feeding heavy rare earth alloy wires are carried out at the same time, and nitrogen and yttrium act synergistically to achieve the purpose of fixing nitrogen and increasing yttrium, so that microalloying treatment of nitrogen and yttrium of high manganese steel is promoted, and purifying and microalloying of the high manganese steel are simultaneously achieved; and after treating by a process technology, the strong plastic toughness, wear resistance and fatigue performance of the high manganese steel are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of high manganese steel, in particular to a method, product and application for purifying molten steel of high manganese steel. Background technique [0002] High manganese steel has excellent impact resistance and work hardening properties. Its chemical composition (wt.%) is C1.0-1.4%, Mn11-14%, and the rest is Fe and a small amount of impurity elements. The special chemical composition leads to the physical properties of high manganese steel with low thermal conductivity and large linear expansion coefficient, coupled with the influence of factors such as the tendency to form carbides and the high content of impurity elements caused by extensive steelmaking, resulting in hot deformation processing of high manganese steel The workmanship is extremely poor. Therefore, high manganese steel is often produced by casting and used directly after water toughening treatment. The high manganese steel produced by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/00
CPCC21C7/0006C21C7/0056C21C7/06
Inventor 陈晨马华张福成李艳国
Owner YANSHAN UNIV
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