Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Refining process of ultra-low carbon and low aluminum steel

A low-aluminum steel and ultra-low carbon technology, applied in the refining process of ultra-low carbon and low-aluminum steel, can solve the problems of high tapping temperature, aggravation of converter, end-point molten steel peroxidation, etc., and achieve high molten steel cleanliness and production safety. Reliable, controlled and stable results

Inactive Publication Date: 2021-12-17
CHONGQING IRON & STEEL CO LTD
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For converters in the late stage of furnace service, due to poor furnace conditions, high tapping temperature and severe peroxidation of molten steel at the end will aggravate the erosion of converter refractory materials, and there is a greater safety risk

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

[0026] This example provides a refining process for ultra-low-carbon and low-aluminum steel, wherein the chemical composition of the ultra-low-carbon and low-aluminum steel is: C: ≤0.005%, Si: 0.45%, Mn: 0.15%, P: ≤0.020%, S: ≤0.010%, Als: ≤0.005%, and the rest is Fe; including the following implementation steps:

[0027] (1) Blast furnace KR desulfurization: control the weight percentage of S element in molten steel ≤0.005%, add low-sulfur steel scrap with S element weight percentage ≤0.010% in the refining process, and scrap steel shall not use slag steel, iron particles, and pig iron blocks.

[0028] (2) Converter smelting: control the end point temperature of the converter to 1635°C, the end point C element content is ≤0.05%, and the end point oxygen content is 500ppm; only low-carbon ferromanganese is added during the tapping process of the converter, and no other alloys are added; thick slag agent is added for tapping 1. Refined lime, 1.8kg of thick slag agent per ton of...

Embodiment 2

[0035] This example provides a refining process for ultra-low-carbon and low-aluminum steel, wherein the chemical composition of the ultra-low-carbon and low-aluminum steel is: C: ≤0.005%, Si: 0.6%, Mn: 0.35%, P: ≤0.020%, S: ≤0.010%, Als: ≤0.005%, and the rest is Fe; including the following implementation steps:

[0036] (1) Blast furnace KR desulfurization: control the weight percentage of S element in molten steel ≤0.005%, add low-sulfur steel scrap with S element weight percentage ≤0.010% in the refining process, and scrap steel shall not use slag steel, iron particles, and pig iron blocks.

[0037] (2) Converter smelting: control the end point temperature of the converter to 1650°C, the end point C element content is ≤0.05%, and the end point oxygen content is 850ppm; only low-carbon ferromanganese is added during the tapping process of the converter, and no other alloys are added; thick slag agent is added for tapping 1. Refined lime, 1.8kg of thick slag agent per ton of ...

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 belongs to the technical field of steel smelting, and relates to a refining process of ultra-low carbon and low aluminum steel. The refining process comprises the following steps of blast furnace KR desulfurization, converter smelting, CAS refining, RH refining, LF refining, slab continuous casting and billet hot delivery. The RH and LF refining process of the ultra-low carbon and low aluminum steel is provided for solving the problems of the ultra-low carbon and low aluminum steel in the actual production process, the obtained ultra-low carbon and low aluminum steel is stable in chemical component control and high in molten steel cleanliness, the converter condition load can be effectively reduced, the refining process is suitable for full-furnace-service smelting, production is safe and reliable, and efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a refining process of ultra-low carbon and low aluminum steel. Background technique [0002] Conventional ultra-low carbon steel is mostly produced by KR→BOF→RH→CC process. However, this production process has higher requirements on molten iron for converters, sulfur content of scrap steel, tapping temperature and oxygen content control of molten steel. For converters in the later stage of furnace service, due to poor furnace conditions, high tapping temperature and severe peroxidation of molten steel at the end will aggravate the erosion of converter refractory materials, and there is a greater safety risk. Contents of the invention [0003] In view of this, the purpose of the present invention is to reduce the load of the converter, realize the stable control of steel quality, and provide a refining process for ultra-low carbon and low aluminum steel. [0004]...

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 Applications(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/06B22D11/18C21C1/02C21C5/28C21C7/00C21C7/064C21C7/10
CPCC21C7/064C21C1/02C21C5/28C21C7/10C21C7/0006C22C33/06C22C38/004C22C38/02C22C38/04C22C38/06B22D11/18
Inventor 刘晓峰黎均红王少波张波陈露涛郝苏胡昌志高祝兵刘渝廖明文敏曾令文
Owner CHONGQING IRON & 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
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