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

Axle steel and continuous casting method thereof

A continuous casting technology for axle steel, which is applied in the field of automotive steel, can solve problems such as insufficient reduction, incomplete welding of central shrinkage cavities, and limited improvement in billet density, so as to achieve improved product quality, good use effect, Effect of improving density and homogeneity

Inactive Publication Date: 2017-03-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
View PDF8 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second invention patent applied the dynamic soft reduction technology to reduce the porosity and shrinkage cavity in the center of the slab. However, for the slab with a large cross-section, the amount of light reduction is not enough, so that there is less solute segregation and molten steel discharged by extrusion, which cannot Completely welded central shrinkage cavity, limited increase in slab density

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
  • Axle steel and continuous casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment is to use the continuous casting method of the present invention to improve the center density of the LZ50 axle steel billet, specifically:

[0058] Continuous casting produces LZ50 blooms with a cross-sectional size of 360mm×450mm. The casting speed of the casting machine is 0.52m / min, and the casting speed is kept stable. The superheat of molten steel in the tundish is 25°C. control, the specific water volume of secondary cooling is 0.45kg / t 钢 ;The large reduction control at the end of solidification is adopted, the reduction rate is 1.5mm / min, the length of the reduction interval is 7.7m, the number of reduction rollers is 6, the total reduction is 31mm, and the reduction of 2# roller is 1.0mm. 3# roller reduction is 1.5mm, 4# roller reduction is 5.5mm, 5# roller reduction is 5.0mm, 6# roller reduction is 5.0mm, 7# roller reduction is 13.0mm.

[0059] After the pouring is completed, low-magnification inspection is carried out on the internal quality ...

Embodiment 2

[0061] This embodiment is to use continuous casting method of the present invention to improve U78CrV axle steel billet central density, specifically:

[0062] Continuous casting produces U78CrV blooms with a cross-sectional size of 360mm×450mm. The casting speed of the casting machine is 0.45m / min, and the casting speed is kept stable. The superheat of molten steel in the tundish is 20°C. control, the specific water volume of secondary cooling is 0.40kg / t 钢 ;Adopt the large reduction control at the end of solidification, the reduction rate is 1.0mm / min, the length of the reduction interval is 5.2m, the number of reduction rollers is 5, the total reduction is 27.5mm, and the reduction of 2# roller is 1.0mm , 3# roller reduction 2.5mm, 4# roller reduction 4.5mm, 5# roller reduction 3.5mm, 6# roller reduction 6.0mm, 7# roller reduction 10.0mm.

[0063] After the pouring is completed, low-magnification inspection is carried out on the internal quality of the bloom billet. The in...

Embodiment 3

[0065] This embodiment is to use the continuous casting method of the present invention to improve the center density of 45# axle steel billet, specifically:

[0066] Continuous casting produces 45# steel blooms with a cross-sectional size of 360mm×450mm. The casting speed of the casting machine is 0.65m / min, and the casting speed is kept stable. The superheat of the molten steel in the tundish is 30°C. Cooling dynamic control, the specific water volume of the secondary cooling is 0.50kg / t 钢 ;The large reduction control at the end of solidification is adopted, the reduction rate is 2.3mm / min, the length of the reduction interval is 4.5m, the number of reduction rollers is 4, the total reduction is 32mm, and the reduction of 2# roller is 1.0mm. 3# roller reduction is 3.5mm, 4# roller reduction is 3.5mm, 5# roller reduction is 4.5mm, 6# roller reduction is 4.5mm, 7# roller reduction is 15.0mm.

[0067] After the pouring is completed, low-magnification inspection is carried out ...

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 belongs to the technical field of steel for vehicles, and particularly relates to axle steel and a continuous casting method thereof. The method includes the steps that firstly, a continuous casting machine is used for casting, withdrawal speed of a casting blank is 0.45-0.65 m / min, and electromagnetic stirring is conducted on a crystallizer and a solidification end; secondly, it is guaranteed that the superheat degree of tundish molten steel in the continuous casting process is 20-30 DEG C; thirdly, the solidification end large reduction technology is used, and the reduction of the continuous casting blank solidification end is increased; fourthly, the dynamic secondary cooling control technology is used, and it is guaranteed that the cooling process of the casting blank is uniform and stable; fifthly, a rear region strong cooling secondary cooling scheme is adopted in secondary cooling, cooling intensity is improved, the specific water ratio is 0.40-0.50 kg / t steel, and the temperature of the surface of a casting blank straightening area is 800-900 DEG C. The continuous casting method of the axle steel can remarkably improve compactness and homogeneity of the casting blank.

Description

technical field [0001] The invention belongs to the technical field of steel for automobiles, and in particular relates to an axle steel and a continuous casting method thereof. Background technique [0002] Axle is an important part of railway vehicle running, and its quality status is directly related to the carrying capacity and transportation safety of the vehicle. Since the axle steel is medium carbon steel, the dendrites are more developed during the solidification process of the cast slab, and the core of the cast slab is easy to form a dendrite "bridge". In this way, the solidification process of molten steel under the bridge is like the solidification process of a small steel ingot, resulting in loose shrinkage cavities. Therefore, how to improve the center density of the axle steel slab is one of the key technologies for continuous casting to produce this type of steel. [0003] The application number is "201210503475.3", and the title of the invention is "A larg...

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): B22D11/16B22D11/22
CPCB22D11/16B22D11/225
Inventor 马晓涛吴国荣祭程陈永杨文中曾建华潘红陈雄谢鑫
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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