Fusing agent additive for manufacturing ultra-low phosphoretic steel with outside-stove refining dephosphorization and its manufacturing method

A technology of ultra-low phosphorus steel and additives, which is applied in the field of metallurgy, can solve the problems of complex process, reduction of scrap steel volume, complicated process, etc., and achieve the effects of simple preparation process, reduced smelting cost, and scientific and reasonable formula

Inactive Publication Date: 2008-12-10
ANGANG STEEL CO LTD
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, most of the current steel mills use the "double slag method", that is, two slagging in the converter smelting, or the "duplex method", that is, one converter is used to smelt molten iron for half the time and then pour it into another converter to continue smelting. method, the shortcomings of these two methods are that the process is complex, the smelting time is long, and the productivity of the converter cannot be fully utilized; there is another way to carry out "three removals" on the molten iron in advance, that is, desiliconization, desulfurization, and dephosphorization, such as Japanese iron and steel companies , its disadvantage is that it requires a lot of equipment, large investment, complex process, large heat loss, and because the temperature of molten iron after "three removals" is low, the amount of scrap steel added during converter smelting is greatly reduced
Therefore, in order to produce these low-phosphorus and ultra-low-phosphorus steels, conventional converter smelting can no longer meet the phosphorus requirements of these steel types, so it is urgent to study the method of assisting dephosphorization by refining outside the furnace, so as to realize the production of ultra-low-phosphorus 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

[0033] Take CaO 50kg, FeO 30kg, CaF 2 Put 20kg into the mixer for uniform mixing, crushing, rolling and airflow micro-powder grinding to prepare the dephosphorization flux for later use; then take 35kg of dephosphorization flux powder with a particle size of 1nm to 3.5mm according to the formula ratio, 35kg of fluorine Put 5kg of calcium oxide powder, 55kg of calcium oxide powder, and 5kg of calcium carbonate into a vertical mixer for uniform mixing for 1 to 8 hours, wherein the activity of calcium oxide is ≥ 200ml; the prepared powder is baked at 80 to 200°C After drying by drying equipment for 10h~22h, the finished flux additive will be finished. After cooling to room temperature, it will be packaged in a moisture-proof sealed package of 500kg / bag and used within 10 days.

Embodiment 2

[0035] Take CaO 20kg, FeO 50kg, CaF according to the formula ratio 2 30kg prepares dephosphorization flux, its method is the same as embodiment 1; Get its particle diameter again according to formula ratio and be 1kg of prepared dephosphorization flux of 1nm~3.5mm, magnesium oxide 98kg, magnesium carbonate 1kg enter vertical mixer Carry out uniform mixing for 1-8 hours, wherein the activity of the magnesium oxide ≥ 200ml; the prepared powder is put into the drying equipment at 100-150 ℃ for drying for 10-22 hours to be the finished flux additive, and the others are the same as in Example 1. .

Embodiment 3

[0037] Take CaO80kg, FeO10kg, CaF according to the formula ratio 2 10kg prepares dephosphorization flux, and its method is the same as embodiment 1; Get its particle diameter again and be the mixture 30kg of the prepared dephosphorization flux 45kg of 1nm~3.5mm, calcium carbonate and magnesium carbonate (the mixture of both) The ratio is not strictly required), according to the ratio of 1:2, take 10kg of the mixture of calcium oxide and magnesium oxide, and 15kg of bentonite into the vertical mixer for uniform mixing for 1 ~ 8h, wherein the activity of calcium oxide and magnesium oxide ≥200ml; the prepared powder is dried in a drying equipment at 70-180°C for 10h-20h to become the finished flux additive, and the others are the same as in Example 1.

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
particle sizeaaaaaaaaaa
water activityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for controlling phosphorus in the production of ultra-low phosphorous steel by microalloy steel, high carbon steel and special steel, in particular to a flux additive for producing the ultra-low phosphorous steel by external refining dephosphorization and a preparation method thereof. The flux additive is prepared by mixing raw materials according to a formula and respectively taking dephosphorizing flux, calcium fluoride, calcium carbonate or magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide, and adhesive through material mixing and drying. The method has scientific formula and simple and reasonable process, can realize the quick refining dephosphorization of molten steel until the content of the phosphorus is lower than 0.0030 percent proven by application, is high in efficiency, steady and short in time, remedies the defect that the prior converter smelting is difficult to achieve the content of the phosphorus in the steel less than 0.01 percent, can meet the requirements of different molten steel on the content of the phosphorus, greatly improves the quality of refining steel, and reduces smelting cost.

Description

technical field [0001] The invention relates to a method for controlling phosphorus in microalloy steel, high carbon steel and special steel to produce ultra-low phosphorus steel, in particular to a flux additive for producing ultra-low phosphorus steel by refining and dephosphorization outside the furnace and its preparation method. The invention belongs to the technical field of metallurgy. Background technique [0002] It is well known that phosphorus is usually controlled as a harmful element in steel. Because the segregation of phosphorus in the steel is serious, the toughness of the steel is deteriorated, resulting in "cold brittleness", especially at low temperature conditions, it is more likely to occur "cold brittleness", and the segregation of phosphorus will also cause the anisotropy of the steel, reducing the Welding performance, causing corrosion fatigue of stainless steel. With the rapid development of science and technology, high-grade high-quality steel has...

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): C21C7/064
Inventor 唐复平王晓峰刘万山孟劲松任子平李德刚陈本文王仁贵张军王文仲李镇张晓军孙群栗红
Owner ANGANG 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
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