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Process for smelting special alloy steel

A technology of alloy steel and process, applied in the field of special alloy steel smelting process, can solve the problems of increasing the difficulty of raw material processing, reducing production efficiency, long melting period of base material, etc., achieve good thermodynamic and dynamic conditions, improve production efficiency and quality less demanding effect

Inactive Publication Date: 2008-10-15
CHONGQING IRON & STEEL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the melting process of vacuum induction furnace, the melting period of the base material is long, generally accounting for 50%-60% of the melting period, prolonging the melting period and reducing production efficiency. With the increase of the capacity of the vacuum induction furnace, the production efficiency is getting lower and lower. At the same time, vacuum melting must add pure metal materials in the vacuum induction furnace for melting, which increases the difficulty of raw material processing and increases the cost of melting

Method used

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Embodiment 1

[0020] The special alloy steel smelting process of this embodiment includes a primary smelting process and a refining process, the primary smelting process is completed in the atmosphere, and the refining process is completed in a vacuum induction furnace, specifically including the following steps:

[0021] a. The basic charge that does not contain easily oxidizable elements is melted and initially smelted in a non-vacuum intermediate frequency induction furnace, and the initial smelting temperature is controlled at 1480-1500°C;

[0022] b. Carry out S and P pretreatment before refining, add slagging agent and thick slag agent to molten steel, and remove slag;

[0023] c. The molten steel after initial smelting is poured into a vacuum induction furnace, vacuumized and refined after the molten steel is conjunctivated, and a deoxidizer is added to the molten steel. According to the requirements of the alloy steel variety in this embodiment, the deoxidizer is carbon block, carbid...

Embodiment 2

[0027] The special alloy steel smelting process of this embodiment includes a primary smelting process and a refining process, the primary smelting process is completed in the atmosphere, and the refining process is completed in a vacuum induction furnace, specifically including the following steps:

[0028] a. The basic charge that does not contain easily oxidizable elements is melted and initially smelted in the vacuum medium frequency induction furnace in the atmosphere, and the initial smelting temperature is controlled at 1500-1550°C;

[0029] b. Carry out S and P pretreatment before refining, add slagging agent and thick slag agent to molten steel, and remove slag;

[0030] c. The molten steel after initial smelting is poured into a vacuum induction furnace, vacuumized and refined after the molten steel is conjunctivated, and a deoxidizer is added to the molten steel. According to the requirements of the alloy steel variety in this embodiment, the deoxidizer is carbon blo...

Embodiment 3

[0035] The special alloy steel smelting process of this embodiment includes a primary smelting process and a refining process, the primary smelting process is completed in the atmosphere, and the refining process is completed in a vacuum induction furnace, specifically including the following steps:

[0036] a. The basic charge that does not contain easily oxidizable elements is melted and initially smelted in the vacuum medium frequency induction furnace in the atmosphere, and the initial smelting temperature is controlled at 1480-1550°C

[0037] b. Carry out S and P pretreatment before refining, add slagging agent and thick slag agent to molten steel, and remove slag;

[0038] c. The molten steel after initial smelting is poured into a vacuum induction furnace, vacuumized and refined after the molten steel is conjunctivated, and a deoxidizer is added to the molten steel. According to the requirements of the alloy steel variety in this embodiment, the deoxidizer is carbon bloc...

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Abstract

The invention discloses a process for smelting a special alloy steel. The process comprises a primary smelting process and a refining process, wherein, the primary smelting process is completed in an atmosphere state, the refining process is completed in a vacuum induction furnace. The invention can greatly shorten the smelting period, improve the production efficiency, have low demand for the quality of the smelting base material, use little or not use pure metal raw materials in the primary smelting process, simplify the processing technology and reduce the production cost. At the same time, the process can precisely control chemical compositions, which creates a good condition for obtaining the stable performance and giving full play to the role of alloy elements, can obviously improve the property of alloy and adjust the refining time, temperature and vacuum degree in a wide range, which creates a favorable thermodynamics condition and a favorable kinetics condition for metallurgical reaction.

Description

technical field [0001] The invention relates to a smelting process of alloy steel, in particular to a smelting process of special alloy steel. Background technique [0002] With the development of science and technology, the demand for special steel products in various industries is also increasing, especially the increasing speed of demand for heat-resistant metals, high-temperature alloys and active metals. The method of melting the raw materials that make up the superalloy material into an alloy by high temperature is one of the preparation processes of the superalloy material. High-temperature alloy materials are mainly used in key components of aviation and spacecraft, and have high requirements for materials. In addition, superalloys have many components and contain a large number of easily oxidizable elements, so the requirements for impurity elements and gas content are very strict. Therefore, when smelting superalloys, it is necessary to use fine materials, that i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/06
Inventor 王周树王渝林河瞿国鸿
Owner CHONGQING IRON & STEEL (GRP) CO LTD
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