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

Boron steel producing converter smelting process

A technology of converter smelting and boron steel, applied in the manufacture of converters, etc., can solve the problems that the boron content of finished steel is lower than the steel type requirements, affect the final performance of steel, reduce the hardenability of steel, etc., achieve low oxygen content and simple steps , the effect of easy access to raw materials

Inactive Publication Date: 2009-07-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
View PDF5 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process of producing boron steel by converter smelting is basically mature, according to the reported literature, due to the high oxygen content in molten steel before boron alloying, that is, the deoxidation effect is poor, and the yield of boron is generally low. Low boron yield often easily causes the boron content of finished steel to be lower than the steel grade requirement, which brings great difficulty to production
At the same time, the low yield of boron means that the amount of oxides of boron in the steel (B 2 o 3 ) increases, and this will reduce the hardenability of the steel, thereby affecting the final properties of the steel

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Boron steel producing converter smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Using the method of the present invention to smelt boron steel

[0027] Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:

[0028] 135.2 tons of molten iron was added into the top and bottom double converter, and it was initially smelted into molten steel.

[0029] Converter tapping, adding 360kg of deoxidizer (about 2.7kg per ton of steel) for pre-deoxidation in the process of tapping, the main component of deoxidizer is CaC 2 62.3%, Si17.5%; 980kg of refining slag (about 7.4kg per ton of steel) is added during the tapping process, and the main physical and chemical indicators of the slag are: Al 2 O 3 43.2%, SiO 2 17.5%, gas output 240L / kg; use a wire feeder to feed 300m (60kg) of aluminum wire for final deoxidation, and the analysis of acid-soluble aluminum in molten steel is 0.022%.

[0030] After feeding the aluminum wire, the ladle is transported to the LF furnace for refining. After refinin...

Embodiment 2

[0032] Example 2 Using the method of the present invention to smelt boron steel

[0033]Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:

[0034] 140.5 tons of molten iron was added into the top-bottom converter to be initially smelted into molten steel.

[0035] Converter tapping, adding 400kg of deoxidizer (about 2.8kg per ton of steel) during the tapping process for pre-deoxidation, the main component of deoxidizer is CaC 2 68.4%, Si 13.9%; 1000kg of refining slag (about 7.1kg per ton of steel) is added during the tapping process. The main physical and chemical indicators of the slag are: Al 2 O 3 45.8%, SiO 2 16.2%, gas output 260L / kg; use a wire feeder to feed 300m (60kg) of aluminum wire for final deoxidation, and the analysis of molten aluminum in acid solution is 0.029%.

[0036] After feeding the aluminum wire, the ladle is transported to the LF furnace for refining. After refining, the analyzed slag sam...

Embodiment 3

[0038] Example 3 Using the method of the present invention to smelt boron steel

[0039] Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:

[0040] 145.0 tons of molten iron was added into the top-bottom double converter to be initially smelted into molten steel.

[0041] Converter tapping, adding 420kg of deoxidizer (about 2.9kg per ton of steel) during the tapping process for pre-deoxidation, the main component of deoxidizer is CaC 2 65.3%, Si 14.6%; 1200kg of refining slag (about 8.2kg per ton of steel) is added in the tapping process, and the main physical and chemical indicators of the slag are: Al 2 O 3 45.4%, SiO 2 16.4%, gas output 240L / kg; use wire feeder to feed Al wire for 400m (80kg in total) for final deoxidation, take steel sample and analyze acid-soluble aluminum to be 0.035%.

[0042] After the aluminum wire is fed, the ladle is transported to the LF furnace for refining. After refining, the analyz...

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 present invention belongs to the field of iron and steel smelting technology, and is especially boron steel producing process in a converter. The production process includes the steps of smelting in a converter, deoxidizing and refining in a ladle, and boron alloying. The boron steel producing process has low oxygen content in molten steel after refining, high boron steel yield of 69.4-91.8 %, and excellent application foreground.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and particularly relates to a method for producing boron steel by converter smelting. Background technique [0002] The purpose of adding a trace amount of boron in steel is to improve the hardenability of steel. For the production of boron steel, due to the very active chemical properties of boron element, it is very easy to mix with oxygen, nitrogen and other elements in the steel during the alloying process. Therefore, for the production of boron steel, metallurgists have long been devoted to the research of boron alloying process. [0003] At present, the main production of boron steel includes two processes, electric furnace and converter, among which the electric furnace process is more studied. Due to the existence of a "reduction period" in the electric furnace smelting process, the oxygen content of slag and molten steel is low, and in a good reducing atmosphere, the yield of boro...

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): C21C5/28C21C7/06C21C5/36
Inventor 陈小龙刘明邓通武刘建华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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