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Method for smelting molybdenum-containing steel in induction furnace in short process based on molybdenum carbide as molybdenum source

A molybdenum carbide and induction furnace technology, applied in the field of iron and steel smelting, can solve the problems of introducing other impurity elements, high energy consumption, and high cost of steelmaking molybdenum bars

Active Publication Date: 2018-10-12
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the short-process smelting of molybdenum-containing steel by induction furnace solves the problem of steel scrap utilization in today's society; on the other hand, the use of molybdenum carbide as a molybdenum source solves the high cost of steelmaking molybdenum bars, high energy consumption and serious pollution in the production process of ferromolybdenum And the low molybdenum yield caused by the volatilization of molybdenum oxide and other impurity elements will be introduced during the alloying process; in addition, the use of molybdenum carbide as a molybdenum source can also increase the carbon content of some high-carbon molybdenum-containing steels. Effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The grade of molybdenum-containing steel smelted in this embodiment is 12CrMo alloy structural steel, which is composed of the following components in weight percentage: C: ≤ 0.15%, Si: 0.20-0.40%, Mn: 0.40-0.70%, P: ≤0.04%, S: ≤0.04%, Cu: ≤0.30%, Cr: 0.4-0.70%, Mo: 0.40-0.55%, the balance is Fe and unavoidable impurities.

[0020] Put scrap steel, molybdenum carbide and other ferroalloy auxiliary materials into the induction furnace according to the composition of the target molybdenum-containing steel. The chemical formula of molybdenum carbide is MoC, and MoC is a powder sample. molybdenum yield.

[0021] Finally, the sampling measurement showed that the molybdenum content in the molten steel was 0.55%, and the calculated molybdenum yield was 99.5%, meeting the smelting requirements of the 12CrMo alloy structural steel.

Embodiment 2

[0023] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0024] The chemical formula of molybdenum source molybdenum carbide is Mo 2 C,Mo 2 C is a block sample, and the molybdenum-containing steel grade of the target smelting of the embodiment is W6Mo5Cr4V2Al high-speed steel, which is composed of the following components in weight percentage: C: 1.05-1.20%, Mn: 0.15-0.40%, Si: 0.20- 0.40%, Cr: 3.80-4.40%, W: ≤5.50-6.75%, Mo: 4.50-5.5%, V: 1.75-2.20%, Al: 0.80-1.20%, P: ≤0.03%, S: ≤0.03% , the balance is Fe and unavoidable impurities.

[0025] Put scrap steel, molybdenum carbide and other ferroalloy auxiliary materials into the induction furnace according to the composition of the target molybdenum-containing steel. The chemical formula of the molybdenum source molybdenum carbide is Mo 2 C,Mo 2 C is a block sample. After the furnace charge is melted, take a sample to measure the molybdenum content in the molten steel and calculate the yield of molybd...

Embodiment 3

[0028] Embodiment 3 is basically the same as Embodiment 1, the difference is:

[0029] Molybdenum Source Molybdenum Carbide as Mo 2 A mixture of C and MoC, the mixture is a block sample, the molybdenum-containing steel grade of the target smelting of the embodiment is 5CrNiMo die steel, and it is composed of the following components in weight percentage: C: 0.50-0.60%, Si: ≤ 0.40% , Mn: 0.50-0.80%, Cr: 0.50-0.80%, Mo: 0.15-0.30%, Ni: 1.40-1.80%, Cu: ≤0.30%, P: ≤0.03%, S: ≤0.03%, and the balance is Fe and unavoidable impurities.

[0030] Put steel scrap, molybdenum carbide and other ferroalloy auxiliary materials into the induction furnace according to the composition of the target molybdenum-containing steel, and the molybdenum source molybdenum carbide is Mo 2 A mixture of C and MoC. The mixture is a block sample. After the charge is melted, take a sample to measure the molybdenum content in the molten steel and calculate the yield of molybdenum.

[0031] Finally, the samp...

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Abstract

The invention relates to a method for smelting molybdenum-containing steel in an induction furnace in a short process based on molybdenum carbide as a molybdenum source and belongs to the technical field of iron and steel smelting. The method is mainly characterized in that the molybdenum carbide is used as the molybdenum source instead of steel-making molybdenum bars, ferromolybdenum, molybdenumoxide and the like in a traditional smelting process of molybdenum-containing steel, the molybdenum-containing steel is smelted in the induction furnace in the short process, and the smelting processof the method comprises a series of steps of charging, melting, smelting and the like; the molybdenum carbide is used as the molybdenum source in molten steel alloying instead of molybdenum-containingadditives such as the steel-making molybdenum bars, ferromolybdenum and molybdenum oxide in the traditional smelting process of the molybdenum-containing steel; on the one hand, the molybdenum-containing steel is smelted in the induction furnace in the short process to solve the utilization problem of scrap steel in nowadays society; on the other hand, the molybdenum carbide is used as the molybdenum source, and the problems of the high cost of the steel-making molybdenum bars, high energy consumption and serious pollution during ferromolybdenum production, low molybdenum yield caused by volatilization of molybdenum oxide and introduction of other impurity elements in the alloying process are solved; and the molybdenum carbide is used as the molybdenum source, and the recarburization effect can be played as well for part of high-carbon molybdenum-containing steel by using the molybdenum carbide as the molybdenum source.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for smelting molybdenum-containing steel in a short-flow induction furnace based on molybdenum carbide as a molybdenum source. Background technique [0002] Molybdenum is an advantageous resource in my country and has excellent alloy properties. About 80% of the molybdenum consumption market is used in the steel industry. Molybdenum is an important alloying element in steel, which can enhance the hardenability of steel, improve the tempering resistance of steel or Tempering stability can improve the strength of steel, especially high temperature strength and toughness, and improve the wear resistance, weldability and heat resistance of steel. At present, molybdenum-containing steel has been widely used because of its outstanding mechanical properties in terms of strength, toughness, red hardness and wear resistance. [0003] Molybdenum carbide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C22C33/04C22C38/22C22C38/20C22C38/02C22C38/04
CPCC21C5/5241C21C5/527C22C33/04C22C38/02C22C38/04C22C38/20C22C38/22Y02P10/20
Inventor 张国华常贺强
Owner UNIV OF SCI & TECH BEIJING