Method for improving bearing steel casting blank center compactness

A technology of center density and bearing steel, which is applied in the field of continuous casting to achieve the effects of reducing center porosity, improving internal quality, and increasing billet center density

Inactive Publication Date: 2017-11-24
NORTHEASTERN UNIV
View PDF11 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent application 201610173116.4 "Central Loose Control Method for 30CrMo Round Billet Steel Slab", the electromagnetic stirring parameters of the control mold are stirring current 350-400A, 2-4Hz; the electromagnetic stirring parameters at the end of solidification are stirring current 200-300A, frequency 6.0 ~8.0Hz; the superheat control range is 15~30℃; the casting speed range of the production organization and furnace machine matching requirements is 0.75~1.00m / min; the secondary cooling specific water volume is controlled at 0.21~0.29L / kg steel, which is mainly for circular Tube billet has some benefits to improve the quality of 30CrMo round tube billet steel billet, but some key technologies for controlling the center porosity and density of bearing steel continuous casting billet have not been involved

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
  • Method for improving bearing steel casting blank center compactness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Continuous casting produces GCr15 bearing steel 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 molten steel in the tundish is 20°C; The reduction is carried out according to the distribution of solid phase ratio, and the reduction starts when fs=0.9 under heavy reduction; the reduction starts when the solid phase ratio fs=1.0 in the center of the slab under convex roll reduction; the solidification end is adopted to control the heavy reduction , the reduction rate is 0.03mm / s, the length of the reduction interval is 6.1m; the total reduction is 26.00mm, the reduction under the light reduction of the 2# roller is 2.00mm, and the reduction under the light reduction of the 3# roller is 3.50mm , The reduction under the light reduction of the 4# roller is 5.00mm, the reduction under the heavy reduction of the 5# roller is 5.50mm, and the reduction under the heavy reducti...

Embodiment 2

[0017] Continuous casting produces GCr15 bearing steel with a cross-sectional size of 360mm×450mm. The casting speed of the casting machine is 0.60m / min, and the casting speed is kept stable. The superheat of molten steel in the tundish is 20°C; The reduction is carried out according to the distribution of the solid phase ratio, and the reduction starts from fs=0.9 under the heavy reduction; the reduction starts from the solid phase ratio fs=1.0 in the center of the slab under the convex roll reduction; the solidification end is adopted to control the heavy reduction , the reduction rate is 0.03mm / s, the length of the reduction interval is 6.1m; the total reduction is 25.00mm, the reduction under the light reduction of the 2# roller is 1.50mm, and the reduction under the light reduction of the 3# roller is 3.00mm , The reduction under the light reduction of the 4# roller is 5.00mm, the reduction under the heavy reduction of the 5# roller is 6.50mm, and the reduction under the h...

Embodiment 3

[0020] Continuous casting produces GCr15 bearing steel with a cross-sectional size of 360mm×450mm. The casting speed of the casting machine is 0.55m / min, and the casting speed is kept stable. The superheat of the molten steel in the tundish is 30°C; The reduction is carried out according to the distribution of the solid phase ratio, and the reduction starts from fs=0.9 under the heavy reduction; the reduction starts from the solid phase ratio fs=1.0 in the center of the slab under the convex roll reduction; the solidification end is adopted to control the heavy reduction , the reduction rate is 0.03mm / s, the length of the reduction interval is 7.6m, and the total reduction is 25.00mm; the reduction under the light reduction of the 1# roller is 2.00mm, and the reduction under the light reduction of the 2# roller is 2.50 mm, the reduction under light reduction of 3# roller is 3.00mm, the reduction under light reduction of 4# roller is 4.50mm, the reduction under heavy reduction o...

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 relates to a continuous casting method, in particular to a method for improving the bearing steel casting blank center compactness. According to the technical scheme, the method for improving the bearing steel casting blank center compactness includes the steps that in the continuous casting process, the pull speed of a casting machine is controlled to range from 0.50 m / min to 0.65 m / min, the degree of superheat of tundish molten steel is controlled to range from 20 DEG C to 30 DEG C, the curing tail end heavy reduction manner is adopted, soft reduction and heavy reduction are carried out according to the distribution solid fraction, heavy reduction is started from fs=0.9, and heavy reduction is carried out through a convex type roller at fs=1.0. By means of the method for improving the bearing steel casting blank center compactness, bearing steel casting blank center porosity can be effectively controlled, and the casting blank center compactness is obviously improved.

Description

technical field [0001] The invention relates to a continuous casting method, in particular to a method for improving the center density of a bearing steel slab. Background technique [0002] Bearing steel has the properties of fatigue resistance, wear resistance, high rigidity and certain corrosion resistance. It is mainly used to manufacture balls, rollers and bearing rings. GCr15 steel is one of them. Due to the high carbon content and alloy content of the bearing steel, the temperature change in the solidification interval is large, resulting in a long solidification gap length, so severe central segregation or porosity will be formed during the solidification process. Center segregation or porosity has little effect on parts such as rollers and ferrules, but it is very harmful to rolling balls on the working surface, and bearing steel is subject to great pressure and friction, so it is necessary for casting slabs and rolled products There are strict requirements on the ...

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): B22D11/18B22D11/20B22D11/12
CPCB22D11/18B22D11/1206B22D11/20
Inventor 祭程朱苗勇石彪
Owner NORTHEASTERN UNIV
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