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

Method and side blowing device for improving rh refining decarburization rate of ultra-low carbon steel

An ultra-low carbon steel and decarburization technology, applied in a method and a side blowing device to improve the RH refining and decarburization rate of ultra-low carbon steel, can solve the problem of not effectively improving the RH decarburization rate, limited decarburization rate improvement ability, The feasibility of the measures is not very high, so as to achieve the effect of good decarburization effect, good molten steel cleanliness, and strong promotion.

Active Publication Date: 2022-06-28
HANDAN IRON & STEEL GROUP +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common problem in the decarburization process of RH refining is that the decarburization time of RH refining is long, which leads to a series of problems such as long refining cycle, large temperature drop in the process, and difficulty in floating inclusions.
This study analyzed the main factors affecting the decarburization rate, but did not propose measures to effectively increase the decarburization rate of RH
[0008] It can be seen that among the existing measures to increase the decarburization rate of RH, the ability to increase the decarburization rate is limited, and some measures are also at the cost of polluting molten steel, so the feasibility of the measures is not great

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
  • Method and side blowing device for improving rh refining decarburization rate of ultra-low carbon steel
  • Method and side blowing device for improving rh refining decarburization rate of ultra-low carbon steel
  • Method and side blowing device for improving rh refining decarburization rate of ultra-low carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0045] Embodiment 1-7: The method for increasing the decarburization rate of ultra-low carbon steel RH refining adopts the following specific processes.

[0046] (1) The process of this method is as follows: after the converter is tapped, LF treatment is performed after top slag treatment, and then RH refining is performed; the process steps of RH refining are as follows.

[0047] Step 1: The temperature of the RH molten steel entering the station is 1610°C-1630°C, the carbon content is 0.03wt%-0.05wt%, and the oxygen content is 0.025wt%-0.45wt%.

[0048] Step 2: After the ladle is refined by RH, raise the ladle for vacuuming operation. After the vacuum degree drops to 200mbar or below, carry out the oxygen blowing decarburization operation with the lowering top lance; the oxygen blowing flow rate is determined according to the oxygen content in the steel, and the oxygen blowing amount It is determined according to the steel tapping amount of the converter, the oxygen content ...

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

PropertyMeasurementUnit
widthaaaaaaaaaa
lengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method and a side blowing device for increasing the decarburization rate of ultra-low carbon steel RH refining. 0.03wt% ~ 0.05wt%, oxygen content is 0.025wt% ~ 0.45wt%; (2) After the ladle is refined by RH, the ladle is raised for vacuuming operation, and after the vacuum degree drops to 200mbar or below, the top gun is lowered Oxygen blowing decarburization operation; the oxygen blowing flow rate is determined according to the oxygen content in the steel, and the oxygen blowing amount is determined according to the steel output of the converter, the oxygen content and the carbon content in the steel; (3) when the RH top lance oxygen blowing ends, the Blow inert gas sideways until decarburization is complete. This method also performs oxygen blowing decarburization operation when the carbon is low, which greatly improves the decarburization rate of the RH refining furnace; this method can remove the carbon content in the steel to below 0.0012% within 12 minutes; it has decarburization Good efficiency, good decarburization effect, good cleanliness of molten steel and so on.

Description

technical field [0001] The invention belongs to the technical field of ultra-low carbon steel smelting, in particular to a method and a side blowing device for increasing the decarburization rate of ultra-low carbon steel RH refining. Background technique [0002] At present, ultra-low carbon steel at home and abroad is generally produced by top-bottom combined blowing converter-RH vacuum refining-slab continuous casting process. There is a lot of carbon in the water to achieve the purpose of smelting ultra-low carbon or extremely low carbon steel. However, the common problems in the decarburization process of RH refining are that the decarburization time of RH refining is long, which leads to a series of problems such as long refining cycle, large process temperature drop, and difficulty in floating inclusions. In order to make up for the temperature drop in the RH refining process, some enterprises make up for it by increasing the end point temperature of the converter, b...

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): C21C7/10C21C7/068
CPCC21C7/10C21C7/068
Inventor 雷明钢高福彬王新华刘俊山陈子刚陈军利许韬武志杰
Owner HANDAN IRON & STEEL 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