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

Smelting method of high-aluminum stainless steel

A smelting method, stainless steel technology, applied in the manufacture of converters, etc., can solve the problems of inability to produce ultra-low carbon steel, achieve the effect of reducing production costs and improving aluminum recovery rate

Active Publication Date: 2013-11-20
SHANXI TAIGANG STAINLESS STEEL CO LTD
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is characterized by the alloying of aluminum in converters, electric arc furnaces or LF refining furnaces, and this process route cannot produce ultra-low carbon steel grades

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

[0028] Steel 0Cr21Al6

[0029] The operation steps of this embodiment are:

[0030] Ⅰ Converter tapping

[0031] For the molten steel smelted in the converter, the steel is tapped when the mass percentage reaches the following requirements:

[0032] C 0.42 Si 0.10 Mn 0.08 P 0.015 S 0.012 Cr 20.85 N 0.012 The rest is iron and unavoidable impurities.

[0033] The amount of molten steel is 75t, the temperature of molten steel after tapping is 1630°C, and the thickness of tapping slag is 30mm.

[0034] Ⅱ VOD Converting

[0035] VOD oxygen blowing decarburization, stop blowing oxygen when the carbon content in molten steel reaches 0.03%, and carry out boiling decarburization, the vacuum degree is 0.8mbar during boiling, the boiling time is 22min, argon gas is blown at the bottom of the ladle to stir, and the flow rate of argon gas is 1100L / min .

[0036] Ⅲ Slag removal

[0037] Break the vacuum, lift the ladle to the slag removal machine for slag removal, the slag thickness i...

Embodiment 2

[0049] Steel 0Cr21Al6

[0050] The operation steps of this embodiment are:

[0051] Ⅰ Converter tapping

[0052] For the molten steel smelted in the converter, the steel is tapped when the mass percentage reaches the following requirements:

[0053] C 0.43 Si 0.08 Mn 0.09 P 0.013 S 0.011 Cr 20.88 N 0.014 The rest is iron and unavoidable impurities.

[0054] The amount of molten steel is 76t, the temperature of molten steel after tapping is 1634°C, and the thickness of tapping slag is 30mm.

[0055] Ⅱ VOD Converting

[0056] VOD oxygen blowing decarburization, stop blowing oxygen when the carbon content in molten steel reaches 0.025%, and carry out boiling decarburization, the vacuum degree is 0.5mbar during boiling, the boiling time is 21min, argon gas is blown at the bottom of the ladle to stir, and the flow rate of argon gas is 1120L / min .

[0057] Ⅲ Slag removal

[0058] Break the vacuum, lift the ladle to the slag removal machine for slag removal, the slag thickness ...

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 discloses a smelting method of high-aluminum stainless steel and belongs to the technical field of smelting of stainless steel. The method comprises the following steps: I, tapping steel from a converter; II, performing vacuum oxygen decarbonization (VOD) blowing; III, slagging off; IV, performing VOD reduction; V, performing VOD aluminum alloying; and VI, performing ladle furnace (LF) refining. According to the method, the Si content of molten steel is effectively reduced, the Si content of steel is less than or equal to 0.10%, the recovery rate of aluminum is increased and is more than or equal to 80%, and the production cost is reduced.

Description

Technical field [0001] The invention involves a smelting method of high aluminum stainless steel, which is the field of stainless steel smelting technology. Background technique [0002] Electric alloy steel, as high -chromium ferrite tissue stainless steel, its C ≤ 0.01%, CR ≥19%, AL ≥ 5.0%, has the characteristics of high resistivity, small resistance temperature coefficient, high use temperature, etc.Chemical, food, home appliances, electric heating, resistor elements and motor vehicle exhaust gas purification trifuna catalysts and other fields.Regarding the production of high aluminum steel, most of the first refining (arc furnace) -LF refining -RH-connected casting process route is used.It is characterized by aluminum alloy in the turntable, arc furnace or LF refining furnace. This process route cannot produce ultra -low -carbon steel species.The application number is 201110327941.2 The smelting method of a high -aluminum low -silicon ultra -pure iron stainless steel is rele...

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
IPC IPC(8): C21C7/068C21C7/04C21C7/10C21C5/28C22C38/18
Inventor 闫志伟濮玉虎李振范军
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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