Converter tapping dephosphorization method of interstitial free steel

A technology of interstitial atom-free steel and converters, applied in the manufacture of converters, etc., can solve the problems of increasing oxide inclusions in molten steel, increasing the amount of deoxidizer, and high cost, so as to reduce dephosphorization pressure, increase yield, and increase success rate Effect

Inactive Publication Date: 2012-10-10
ANGANG STEEL CO LTD
View PDF3 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the end of blowing, the furnace director often continues to dephosphorize by point blowing, but this often causes overoxidation of molten steel, reduces the yield of molten steel, increases the amount of deoxidizer, especially increases the inclusion of oxides in molten steel, directly Affects the pourability of molten steel
[0003] At present, steel mills generally adopt the method of adding dephosphorization agent into the converter furnace

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

[0019] Embodiment 1: The molten steel tank contains 240 tons of steel.

[0020] 1. At the end of converter blowing, the oxygen value in the steel is controlled at 650ppm, and the carbon content is controlled at 0.035wt% to avoid over-oxidation of the steel.

[0021] 2. Slag blocking and tapping: block the tapping hole before tapping, use slag dart to block slag tapping when tapping, and do not carry out molten steel and deoxidation during tapping, do not blow argon during tapping, and tap time is controlled within 8min.

[0022] 3. Standard hanging tank temperature control:

[0023] The temperature of the first hanging tank is controlled at 1650°C;

[0024] The temperature of the second and third hanging tanks is controlled at 1643°C;

[0025] The temperature of the rest of the tanks is controlled at 1650°C.

[0026] 4. When 1 / 3 of the steel is tapped from the converter, add 600kg of lime, 720kg of converter slag, 50kg of fluorite, and 95kg of iron oxide into the molten st...

Embodiment 2

[0027] Embodiment 2: The amount of steel in molten steel cans is 245 tons.

[0028] 1. At the end of converter blowing, the oxygen value in the steel is controlled at 800ppm, and the carbon content is controlled at 0.045wt% to avoid over-oxidation of the steel.

[0029] 2. Slag blocking and tapping: block the tapping hole before tapping, use slag dart to block slag tapping when tapping, and do not carry out molten steel and deoxidation during tapping, do not blow argon during tapping, and tap time is controlled within 6min.

[0030] 3. Standard hanging tank temperature control:

[0031] The temperature of the first hanging tank is controlled at 1653°C;

[0032] The temperature of the second and third hanging tanks is controlled at 1638°C;

[0033] The temperature of the rest of the tanks is controlled at 1633°C.

[0034] 4. When 1 / 3 of the steel is tapped from the converter, 1220kg of lime, 200kg of converter slag, 95kg of fluorite, and 50kg of iron oxide scale are added t...

Embodiment 3

[0035] Embodiment 3: The amount of steel in molten steel cans is 235 tons.

[0036] 1. At the end of converter blowing, the oxygen value in the steel is controlled at 890ppm, and the carbon content is controlled at 0.040wt% to avoid over-oxidation of the steel.

[0037] 2. Slag blocking and tapping: block the tapping hole before tapping, use slag dart to block slag tapping when tapping, and do not carry out molten steel and deoxidation during tapping, do not blow argon during tapping, and tap time is controlled within 7min.

[0038] 3. Standard hanging tank temperature control:

[0039] The temperature of the first hanging tank is controlled at 1660°C;

[0040] The temperature of the second and third hanging tanks is controlled at 1650°C;

[0041] The temperature of the rest of the tanks is controlled at 1653°C.

[0042] 4. When 1 / 3 of the steel is tapped from the converter, add 940kg of lime, 470kg of converter slag, 70kg of fluorite, and 75kg of iron oxide into the molte...

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 provides a converter tapping dephosphorization method of an interstitial free steel. The method comprises steps of: at a converting endpoint, controlling oxygen value and carbon content in steel at 600-900 ppm and 0.030-0.050wt%; plugging a tapping port before tapping, and stopping the slag with slag stopping dart during tapping for no less than 5 min; at the same time, controlling hanging tank temperature according to different tank batches: at 1/3 of converter tapping, adding lime, converter slag, fluorite and iron oxide according to a certain amount to realize a rapid dephosphorization reaction. According to the invention, converter tapping dephosphorization rate of the IF steel can reach 30-50%; and pressure in the converter is significantly reduced; and one-time successful rate and the yield of liquid steel are improved. Compared with prior art, the invention has the characteristics of small usage amount of dephosphorization agent, low cost, small tapping temperature drop and little energy consumption.

Description

technical field [0001] The invention belongs to the field of steelmaking technology, and in particular relates to a method for dephosphorizing molten steel during the tapping process of converter smelting interstitial atom-free steel (IF steel). Background technique [0002] The finished P content of IF steel is relatively high, and the P content of some IF steel products is required to be below 0.012 wt%, and the P content of individual IF steel products is even required to be below 0.010 wt%, which puts forward very high requirements for converter smelting . At the end of blowing, the furnace director often continues to dephosphorize by point blowing, but this often causes overoxidation of molten steel, reduces the yield of molten steel, increases the amount of deoxidizer, especially increases the inclusion of oxides in molten steel, directly Affect the pourability of molten steel. [0003] At present, steel mills generally adopt the method of adding dephosphorization ag...

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
IPC IPC(8): C21C5/30C21C7/064
Inventor 梅雪辉温铁光张越王晓峰郭猛赵增强王鹏简龙臧绍双辛国强毛志勇张志文赵志刚
Owner ANGANG STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap