Vacuum induction melting method of high-oxygen-content steel

A vacuum induction smelting technology with high oxygen content, which is applied in the field of vacuum induction smelting high oxygen content steel, can solve the problems that the cutting performance of the design composition cannot be truly reflected, achieve breakthroughs in technical bottlenecks, speed up the pace of development, and improve cutting performance.

Active Publication Date: 2013-12-25
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, universities, research institutes, and enterprises are actively developing new types of environmentally friendly free-cutting steels with high oxygen content. Vacuum induction furnaces are used in the laboratory development and research stage. The oxygen content of small steel ingots smelted is usually below 30ppm, which cannot be true. Cutting performance reflecting design components

Method used

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  • Vacuum induction melting method of high-oxygen-content steel
  • Vacuum induction melting method of high-oxygen-content steel
  • Vacuum induction melting method of high-oxygen-content steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Low-carbon, high-sulfur, high-oxygen AISI 1215 free-cutting steel is smelted in a vacuum induction furnace with a charging capacity of 80kg.

[0026] 1. Chemical composition of the target steel grade: (unit: wt%)

[0027]

[0028] 2. Raw materials: (unit: wt%)

[0029]

[0030] 3. Specific operation steps:

[0031] 1) charging: put 78kg of industrial pure iron into the crucible;

[0032] 2) Vacuuming: After the vacuum degree is evacuated to 48Pa, it is filled with 5000Pa argon;

[0033] 3) Initial smelting: 78kg of industrial pure iron is induction smelted in the furnace until it is clear;

[0034] 4) Refining pre-decarburization: put 40g of iron oxide scale into the crucible, perform secondary vacuuming to make the vacuum degree reach 68Pa, and conduct induction refining for 8 minutes to remove a small amount of C, N and others in industrial pure iron Volatile impurity elements;

[0035] 5) Pre-oxygenation: After refining, fill the furnace with 5000Pa oxygen...

Embodiment 2

[0044] Low-carbon, high-sulfur, high-oxygen AISI 1215 free-cutting steel is smelted in a vacuum induction furnace with a charging capacity of 80kg.

[0045] 1. Chemical composition of the target steel grade: (unit: wt%)

[0046]

[0047] 2. Raw materials: (unit: wt%)

[0048] Same as Example 1.

[0049] 3. Specific operation steps:

[0050] 1) charging: put 78kg of industrial pure iron into the crucible;

[0051] 2) Vacuuming: After the vacuum degree is evacuated to 48Pa, it is filled with 5000Pa argon;

[0052] 3) Initial smelting: 78kg of industrial pure iron is induction smelted in the furnace until it is clear;

[0053] 4) Refining pre-decarburization: put 40g of iron oxide scale into the crucible, perform secondary vacuuming to make the vacuum degree reach 68Pa, and conduct induction refining for 8 minutes to remove a small amount of C, N and others in industrial pure iron Volatile impurity elements;

[0054] 5) Pre-oxygenation: After refining, fill the furnace w...

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Abstract

The invention discloses a vacuum induction melting method of high-oxygen-content steel, which comprises the following steps: using iron scales or iron ores as an oxygen supply source, charging oxygen gas and argon gas into the furnace, regulating the gas pressure in the furnace, and reasonably optimizing the addition sequence of the iron scales, alloy and graphitic carbon, thereby ensuring the high oxygen content. The invention solves the problem of contradiction between high vacuum degree and high oxygen content, greatly enhances the oxygen content in molten steel, and provides technical guarantees for melting high-oxygen-content steel grades in vacuum.

Description

technical field [0001] The invention belongs to the technical field of vacuum induction metallurgy, in particular to a method for vacuum induction smelting steel with high oxygen content. Background technique [0002] Vacuum smelting began during the First World War. Due to the high degree of vacuum, in addition to degassing, it can also remove trace impurities with high vapor pressure in the alloy. Therefore, some high-grade special steels are also used for vacuum smelting. Vacuum smelting is now widely used for deoxidation, decarburization, improving alloy yield, fine-tuning molten steel composition, etc. [0003] The core problem of vacuum induction smelting is the carbon-oxygen reaction. Due to the high vacuum in the furnace, the general furnace pressure can reach 40-60Pa, and the partial pressure of CO is very low, which destroys the original balance of carbon and oxygen, making the oxygen in molten steel The content is very low. When smelting under vacuum, the oxygen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10
Inventor 贺莹莹周铖麻晗刘建民
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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