Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for compound deoxidation to produce IF steel

A composite deoxidation and molten steel technology, applied in the manufacture of converters and other directions, can solve problems such as insufficient floating, and achieve the effect of improving quality and reducing the generation of Al2O3 inclusions.

Active Publication Date: 2020-07-17
ANGANG STEEL CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the use of aluminum deoxidation will produce a large amount of Al 2 o 3 inclusions, due to Al 2 o 3 The size of the inclusions is large, and the Al 2 o 3 Insufficient flotation produces inclusion defects, and the inclusion defect rate of IF steel in some manufacturers is greater than 3%

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the present embodiment, a kind of compound deoxidation produces the method for IF steel, comprises the steps:

[0032] 1. Converter steelmaking process (tapping capacity: 260 tons);

[0033] 1) Converter smelting control endpoint carbon content: 0.032wt%, endpoint oxygen content 626ppm, tapping temperature 1700°C;

[0034] 2) Bottom blowing and stirring for 30 seconds during tapping to further reduce the oxygen content in molten steel;

[0035] 2. RH vacuum treatment process (260 tons of molten steel);

[0036] 1) The oxygen content of molten steel when entering the RH vacuum furnace is 663ppm, and medium-carbon ferromanganese is added when the vacuum is pumped for 3 minutes. The amount of medium-carbon ferromanganese added = the target Mn content of the steel type - the Mn content of the converter argon station, based on the addition of 35kg of medium carbon The Mn content in ferromanganese steel is calculated by increasing 0.01wt%;

[0037] 2) When the vacuum is...

Embodiment 2

[0042] In the present embodiment, a kind of compound deoxidation produces the method for IF steel, comprises the steps:

[0043] 1. Converter steelmaking process (tapping capacity: 260 tons);

[0044] 1) Converter smelting control endpoint carbon content: 0.037wt%, endpoint oxygen content 674ppm, tapping temperature 1710°C;

[0045] 2) Bottom blowing and stirring for 30 seconds during tapping to further reduce the oxygen content in molten steel;

[0046] 2. RH vacuum treatment process (260 tons of molten steel);

[0047]1) The oxygen content of the molten steel when entering the RH vacuum furnace is 637ppm. Add medium-carbon ferromanganese when vacuuming for 2 minutes. The amount of medium-carbon ferromanganese added = the target Mn content of the steel type - the Mn content of the converter argon station, and add 32kg of medium carbon The Mn content in ferromanganese steel is calculated by increasing 0.01wt%;

[0048] 2) Oxygen was fixed for the first time when vacuuming f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for producing IF steel by adopting composite deoxidation. The method comprises the following steps that 1, during converter steelmaking, the end point carbon contentis controlled to be 0.03wt%-0.04 wt%, the end point oxygen content is less than or equal to 700 ppm, and the tapping temperature is 1695-1720 DEG C; during tapping, bottom blowing stirring is carriedout; 2, when RH vacuum treatment is carried out, and the mid-carbon ferromanganese is added when the RH vacuum treatment is carried out for 2-3 minutes; if the oxygen content is larger than or equal to 450 ppm during the first time of oxygen measuring, and then silicon iron is added for lowering the oxygen content; and the oxygen content is controlled to be 250-400 ppm during the second time of the oxygen oxygen probing, and the deoxidized aluminum and the component aluminum are added; then the component alloy is added, wherein the component alloy comprises ferrotitanium, ferrosilicon and niobium iron; and clean circulation is carried out for 8 minutes or above, vacuum breaking, temperature measuring, sampling and moving out are carried out. According to the method, by adopting the composite deoxidation mode, the generation of Al2O3 inclusions in IF steel can be effectively reduced, so that the quality of the IF steel is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for producing IF steel through composite deoxidation. Background technique [0002] Aluminum deoxidation is usually used in the production of IF steel. In actual production, the oxygen content is often too high ([O]≥600ppm) when the molten steel enters the RH vacuum furnace. In addition, the use of aluminum deoxidation will produce a large amount of Al 2 o 3 inclusions, due to Al 2 o 3 The size of the inclusions is large, and the Al 2 o 3 Insufficient flotation produces inclusion defects, and the rate of inclusion defects in IF steel of some manufacturers is greater than 3%. Contents of the invention [0003] The invention provides a method for producing IF steel through compound deoxidation, which can effectively reduce Al in IF steel by adopting the method of compound deoxidation. 2 o 3 The generation of inclusions improves the quality of IF steel. [00...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/10C21C5/28
CPCC21C5/28C21C7/06C21C7/10
Inventor 刘振中陈志威李玉德王成青
Owner ANGANG STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com