Micro-alloyed high-carbon steel and application thereof

A micro-alloying, high-carbon steel technology, applied to new steel products and their application fields, can solve the problems of difficult control of composition fluctuations, poor continuous pouring of molten steel, etc. increased effect

Inactive Publication Date: 2007-02-28
JIUQUAN IRON & STEEL GRP
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the deficiencies of microalloying technology for high-carbon hard wire at home and abroad are: the micro-alloying of high-carbon hard wire is mainly used in the production of large-scale high-carbon hard wire (such as steel grade 82B) for steel strands; When the microalloying elements are chromium, vanadium or rare earth, there are disadvantages such as poor continuous pouring of molten steel (such as adding trace chromium or rare earth) and difficult control of composition fluctuation (such as adding trace vanadium) during production.
[0004] For small-sized high-carbon hard wires (such as steel grades 72A and 70#) used in the manufacture of high-strength steel wire ropes or steel strands, there are currently no reports of microalloying treatment in production. The strength and comprehensive performance of its steel wire products, the invention provides a micro-alloying treatment technology for small-sized high-carbon hard wires, the strength and comprehensive performance of the niobium micro-alloying technology are greatly improved, and the manufacturing requirements are met. Use Demand for high-strength steel wire rope or steel strand

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

[0021] The furnace number is 33 / 4531: 55 tons of molten iron and 5 tons of scrap steel are added to the converter, and the converter is smelted for 31 minutes. The final composition (weight percentage) is: carbon (0.62%), manganese (0.46%), phosphorus (0.012%) , sulfur (0.013%), 1605 ℃ of tapping temperature, 55 tons of tapping amount, when tapping, add the alloy and be: ferrosilicon 130Kg, silicon manganese 100Kg, aluminum manganese ferro 50Kg, ferroniobium 40Kg, obtain final composition ( Weight percent content) is: carbon (0.71%), silicon (0.24%), manganese (0.64%), phosphorus (0.019%), sulfur (0.012%), niobium (0.029%), aluminum (0.011%); molten steel Hoisted to the ladle refining furnace (LF) for 31 minutes of refining, adding 600Kg of refining slag and 100Kg of submerged arc slag, leaving the LF furnace at a temperature of 1545°C; pouring molten steel for protection and pouring, with a tundish temperature of 1494-1501°C and a casting speed of 1.7-1.8m / min, the pull-out ...

Embodiment 2

[0023] The furnace number is 33 / 4536: 53 tons of molten iron and 5 tons of scrap steel are added to the converter, and the converter is smelted for 30 minutes. The final composition (weight percentage) is: carbon (0.61%), manganese (0.52%), phosphorus (0.011%) , sulfur (0.011%), 1585 ℃ of tapping temperature, 55 tons of tapping amount, when tapping, add alloys and be: ferrosilicon 150Kg, silicon manganese 100Kg, aluminum manganese ferro 50Kg, ferro niobium 40Kg, obtain final composition ( weight percentage) is: carbon (0.72%), silicon (0.26%), manganese (0.60%), phosphorus (0.011%), sulfur (0.010%), niobium (0.031%), aluminum (0.014%); molten steel Hoisted to the ladle refining furnace (LF) for 30 minutes of refining, adding 600Kg of refining slag and 100Kg of submerged arc slag, leaving the LF furnace at a temperature of 1555°C; pouring molten steel for protection and pouring, with a tundish temperature of 1501-1509°C and a casting speed of 1.7-1.8m / min, the pull-out specifi...

Embodiment 3

[0025] The furnace number is 33 / 4546: 54 tons of molten iron and 4 tons of scrap steel are added to the converter, and the converter is smelted for 29 minutes. The final composition (weight percentage) is: carbon (0.60%), manganese (0.43%), phosphorus (0.012%) , sulfur (0.013%), 1602 ℃ of tapping temperature, 55 tons of tapping amount, when tapping, add alloys and be: ferrosilicon 140Kg, silicon manganese 40Kg, aluminum manganese ferro 50Kg, ferroniobium 40Kg, obtain final composition ( % by weight) is: carbon (0.71%), silicon (0.29%), manganese (0.61%), phosphorus (0.010%), sulfur (0.010%), niobium (0.030%), aluminum (0.013%); Lift the molten steel to the ladle refining furnace (LF) for 30 minutes of refining, add 600Kg of refining slag and 100Kg of submerged arc slag, and leave the LF furnace at a temperature of 1565°C; the molten steel is poured to protect the pouring, the tundish temperature is 1508-1515°C, and the casting speed is 1.6-1.7 m / min, pull out specification is ...

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 present invention relates to one kind of microalloying high carbon steel and its application. By means of adding Nb element into steel, the present invention produces Nb containing microalloying high carbon steel capable of being used in making high strength steel cable or twisted steel wire. The microalloying high carbon steel of the present invention consists of Fe, C, Si, Mn, Nb, P, S, Al, etc. Adding Nb in small amount into high carbon steel can raise the conversion temperature from austenite to pearlite, raise the sorbite ratio, raise the toughness and plasticity of the steel product.

Description

technical field [0001] The invention relates to a new steel product and its application, in particular to a niobium microalloyed high-carbon steel and its application. Background technique [0002] The micro-alloying of high-carbon hard wire refers to adding a small amount of alloying elements such as chromium, vanadium, etc. to the steel to improve the degree of austenite stabilization, improve the hardenability of the wire when it is cooled, and ensure sufficient sorbite. Make the structure of the wire uniform and increase the strength. [0003] At present, the deficiencies of microalloying technology for high-carbon hard wire at home and abroad are: the micro-alloying of high-carbon hard wire is mainly used in the production of large-scale high-carbon hard wire (such as steel grade 82B) for steel strands; When the microalloying elements chromium, vanadium or rare earth are used, there are disadvantages such as poor continuous pouring of molten steel (such as adding trace...

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): C22C38/12
Inventor 虞海燕顾克井张长平王酒生
Owner JIUQUAN IRON & STEEL GRP
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