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

Method for controlling N content of high-aluminum and high-vanadium slabs

A control method and high vanadium slab technology are applied in the field of high alumina and high vanadium steel smelting, and can solve the problems of end-point molten steel overoxidation, insufficient converter end-point temperature and high nitrogen content of end-point molten steel

Inactive Publication Date: 2020-09-11
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Semi-steel smelting of high-grade steel represented by automobile panels Compared with other domestic factories, due to the influence of the heat source of semi-steel entering the furnace, the temperature at the end of the converter is insufficient, which may easily cause over-oxidation of the end-point molten steel and lead to high nitrogen content in the end-point molten 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
  • Method for controlling N content of high-aluminum and high-vanadium slabs
  • Method for controlling N content of high-aluminum and high-vanadium slabs
  • Method for controlling N content of high-aluminum and high-vanadium slabs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Pansteel Group Xichang Steel and Vanadium Co., Ltd. steel plant smelts high-strength, high-aluminum, high-vanadium steel (34MnB5V), converts 230 tons of semi-steel, adds 11 tons of clean scrap steel, blows in top-low re-blowing mode, and uses gas in the whole process of bottom blowing gas supply mode Argon gas is selected, carbon is hit once, the carbon at the end point is 0.06%, the oxygen at the end point is 421ppm, the temperature at the end point is 1684°C, and the slag foaming agent (CaCO 3 )150kg;

[0043] In the LF process, the molten steel is heated up, the composition is fine-tuned, and the production rhythm is adjusted to make the alloy composition meet the requirements of the steel type. The temperature of the molten steel entering the LF is 1611 ° C, and the temperature of the exiting station is 1600 ° C. The molten steel LF leaves the station to take nitrogen samples for analysis;

[0044] In the molten steel RH process, the vacuum chamber body and the imme...

Embodiment 2

[0047] Pansteel Group Xichang Steel and Vanadium Co., Ltd. steel plant smelts high-strength, high-aluminum, high-vanadium steel (34MnB5V), converts 230 tons of semi-steel, adds 10.7 tons of clean scrap steel, blows in top-low re-blowing mode, and uses gas in the whole process of bottom blowing gas supply mode Argon gas is selected, carbon is hit once, the carbon at the end is 0.057%, the oxygen at the end is 334ppm, the temperature at the end is 1641°C, and 150kg of slag foaming agent is added to the slag surface of the ladle after tapping, deoxidation and alloying;

[0048] In the LF process, the molten steel is heated up, the composition is fine-tuned and the production rhythm is adjusted to make the alloy composition meet the steel type requirements. The temperature of the molten steel entering the LF is 1570°C, and the temperature of the leaving station is 1617°C. The molten steel LF leaves the station to take nitrogen samples for analysis;

[0049] In the molten steel RH p...

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
densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for controlling the N content of high-aluminum and high-vanadium slabs. The method for controlling the N content of the high-aluminum and high-vanadium slabs comprisesthe steps that LD-LF-RH-CC are sequentially carried out, in the LD stage, a bottom blowing air feeding method is used in the smelting of high-aluminum and high-vanadium steel, the low gun position isused in the late stage of smelting, and a slag foaming agent is added in the late stage of smelting; in the RH stage, a vacuum chamber body is in butt welding with an immersion pipe, then a penetration method is used for flaw detection and welding, and the immersion pipe life is less than or equal to 50 times; and in the CC stage, double-argon sealed long water gap is used for pouring. The introduction of N is strictly controlled in the LD stage, the RH stage and the CC stage, so that the final prepared high-aluminum and high-vanadium slabs have a lower N content; and after industrial production, the N content of the high-aluminum and high-vanadium slabs is less than or equal to 40ppm.

Description

technical field [0001] The invention relates to the technical field of high-aluminum and high-vanadium steel smelting, in particular to a method for controlling the N content of a high-aluminum and high-vanadium slab. Background technique [0002] Nitrogen is a harmful element for high-grade steel represented by automobile panels, which will reduce the plasticity and impact toughness of steel, and can cause cold and brittle steel like phosphorus; at the same time, nitrogen will also interact with titanium, Elements such as aluminum form nitride inclusions, causing deterioration of the surface quality of the steel and reducing the yield. With the increasing requirements for steel quality, how to control the nitrogen content in steel to a lower level has become one of the focuses of attention. High-grade steel represented by automobile panels generally requires the nitrogen content of the finished product to be 30×10 -6 the following. Xichang Steel Plant adopts the LD-LF-RH...

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): C21C7/10C21C5/35C21C7/076C22C38/02C22C38/06C22C38/24C22C38/26C22C38/32C22C38/38B22D41/58
CPCB22D41/58C21C5/35C21C7/076C21C7/10C22C38/02C22C38/06C22C38/24C22C38/26C22C38/32C22C38/38Y02P10/20
Inventor 王军邝春福彭友全杨晓东卓钧邱伟张彦恒
Owner PANGANG GRP XICHANG STEEL & VANADIUM 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