Method for producing high carbon steel by high-catching carbon method

A high-draw carbon method, high-carbon steel technology, applied in the direction of improving process efficiency, manufacturing converters, etc., can solve the oxygen pressure and oxygen supply strength without clear blowing, reduce the amount of charging and tapping, increase Erosion of fluorite to furnace lining, etc., to achieve stable slag effect, reduce iron oxidation, and stabilize dephosphorization effect

Active Publication Date: 2010-07-28
SHOUGANG CORPORATION
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molten pool material level is 13-15% lower than the conventional one, which will reduce the amount of loading and tapping, and reduce production efficiency; the content of FeO in the slag is low, <10%, which is not conducive to slag melting, and fluorite is used to force slag melting. This will increase the erosion of fluorite on the furnace lining, which is not conducive to the improvement of furnace life; the slagging method of lime and fluorite will cause large blowing losses of iron in the metal, and the metal yield will be low; there is no clear oxygen pressure for blowing in the literature and oxygen intensity
This process is also not suitable for modern converters to smelt high carbon 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the method for producing high-carbon steel by the high-drawing carbon method of the present invention, add 180 tons of molten iron and 30 tons of scrap steel into a 210-ton converter, and the conditions of the molten iron are: 4.05% C, 0.39% Si, 0.2% Mn, 0.09% P , 0.032% S, 1347°C; the converter is in the middle and late stages, and 3.3Nm 3 / min / t oxygen supply intensity blowing, the position of the blowing gun is 2.7 meters, the position of the process gun is 2.7-2.1 meters, and the position of the carbon pulling gun is 1.9 meters. After the blowing is started, add 10 tons of lime to the converter in two batches within 4.5 minutes (50 kg / ton steel), 4 tons of ore (20 kg / ton steel), 2 / 3 of the total amount added in the first batch, 1 / 3 of the total amount added in the second batch; 70-85% of the blowing oxygen consumption Two batches of ore and fluorite are added, totaling 600 kg and 400 kg; the total blowing time is 13 minutes, and the blowing is completed...

Embodiment 2

[0021] According to the method for producing high-carbon steel by the high-drawing carbon method of the present invention, 180 tons of molten iron and 30 tons of scrap steel are added to a 210-ton converter, and the conditions of the molten iron are: 4.19%C, 0.35%Si, 0.15%Mn, 0.079%P , 0.035% S, 1332°C; the converter is in the middle and late stages, and 3.3Nm 3 / min / t oxygen supply intensity blowing, the position of the blowing gun is 2.7 meters, the position of the process gun is 2.7-2.1 meters, and the position of the carbon pulling gun is 1.9 meters. After the blowing is started, add 10 tons of lime to the converter in two batches within 4.5 minutes (50 kg / ton steel), 3 tons of ore (15 kg / ton steel), 2 / 3 of the total amount added in the first batch, 1 / 3 of the total amount added in the second batch; 70-85% of the blowing oxygen consumption Two batches of ore and fluorspar are added, totaling 500 kg and 300 kg; the total blowing time is 13 minutes, after blowing is complete...

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 method for producing high-carbon steel by a high-carbon-withdrawal method, in particular to a smelting process of high-carbon-withdrawal tapping when a converter adopts a single slag process to produce high-carbon steel. The process comprises the following steps of: (1) putting molten iron and scrap steel into the converter according to the requirements on tapping temperature and a certain hot metal ratio; (2) air refining with the oxygen supply strength of 3.1 to 3.4Nm<3> / min / t in the converter; (3) adding active lime and an ore slagging element into the converter; (4) adopting an oxygen supply system of different lance positions under constant flow, adopting rather high lance positions in the whole course of air refining of the converter, and adopting a lance position system in which lance positions get lower piecewise from the beginning to the end of air refining; (5) adding ore and fluorite in small amount by a plurality of batches when the total air refining oxygen consumption is within 70 percent to 85 percent; (6) finishing the air refining of the converter, deslagging by turning down the converter, temperature measurement and sampling; and (7) converter tapping. The smelting process has advantages of short time of air refining of the converter and active slag, and can meet the dephosphorization effect under the high-carbon-withdrawal condition of molten steel, and realize the high-carbon-withdrawal tapping.

Description

technical field [0001] The invention relates to a smelting method of high-carbon steel, in particular to a smelting method for high-drawing carbon tapping when a converter adopts a single slag method to produce high-carbon steel. Background technique [0002] There are two ways to smelt high-carbon steel in converters according to the carbon content of molten steel when tapping: one is the high-drawing carbon method, and the other is the low-drawing carbon method. Compared with the low-drawing carbon tapping method, the high-drawing carbon tapping method has the following advantages: short blowing time, less oxygen consumption, less blowing loss of iron, high metal yield; less erosion of slag to the furnace lining, prolonging the furnace life ; Small amount of carbon added, less amount of carbon powder added; low oxygen content in steel, less alloy consumption, less original inclusions; low content of nitrogen, hydrogen and other gases in steel; less fluctuations in steel co...

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): C21C5/28C21C5/30C21C5/36
CPCY02P10/20
Inventor 田志红李永东张小明王海宝刘启江李鹏程王宴宾朱志远姜中行
Owner SHOUGANG CORPORATION
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