Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Continuous casting process capable of relieving internal quality defects of bearing steel bloom

A technology of internal quality and continuous casting process, which is applied in the field of continuous casting process to reduce the internal quality defects of bearing steel blooms, and can solve the problem that the surface of the slab is prone to steps, the subcutaneous cracks of the slab are prone to occur, and the amount of cast slab waste is large. and other problems, to achieve the effect of eliminating channel-type V-shaped segregation, reducing casting rolling force, eliminating transverse cracks and longitudinal cracks

Inactive Publication Date: 2019-09-20
XINGTAI IRON & STEEL
View PDF9 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the convex roll reduction process has the following disadvantages: (1) It is difficult to completely solve the problem of deviation of the continuous casting slab under the convex roll reduction, resulting in a large amount of cast slab rejection; (2) The continuous casting slab is extremely Subcutaneous cracks are easy to occur; (3) Convex rollers wear quickly, and the surface of the slab is prone to surface quality defects such as steps and right angles, which will bring greater pressure to the subsequent grinding process, resulting in a substantial increase in costs

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
  • Continuous casting process capable of relieving internal quality defects of bearing steel bloom
  • Continuous casting process capable of relieving internal quality defects of bearing steel bloom
  • Continuous casting process capable of relieving internal quality defects of bearing steel bloom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: The continuous casting process for alleviating internal quality defects of bearing steel blooms is specifically described as follows.

[0028] (1) The section size of bearing steel GCr15 continuous casting slab is 280mm×325mm, the chamfering angle is 60°, and the chamfering slope length is 75mm; the main chemical composition of casting heat is (wt): C 0.98%, Si 0.23 %, Mn 0.25%, P 0.011%, S0.003%, Cr 1.45%.

[0029] (2) The main process parameters of continuous casting are shown in Table 2 and Table 3.

[0030] Table 2: Depression parameters of this embodiment

[0031]

[0032] Table 3: Continuous casting parameters of the present embodiment

[0033]

[0034] (3) The continuous casting slab obtained in this example was tested. The average value of the C range in the center of the slab was 0.045%, the proportion of central porosity ≤ 0.5 was 92%, and the proportion of central shrinkage ≤ 0.5 was 100%. The defect rate was 0.18%. figure 2 It is a c...

Embodiment 2

[0035] Embodiment 2: The continuous casting process for alleviating internal quality defects of bearing steel blooms is specifically described as follows.

[0036] (1) The section size of the bearing steel GCr15 continuous casting slab is 280mm×325mm, the angle of the chamfer is 50°, and the length of the slope of the chamfer is 90mm; the main chemical composition of the casting heat is (wt): C 0.95%, Si 0.32 %, Mn 0.45%, P 0.010%, S0.004%, Cr 1.58%.

[0037] (2) The main process parameters of continuous casting are shown in Table 4 and Table 5.

[0038] Table 4: Depression parameters of this embodiment

[0039]

[0040] Table 5: Continuous casting parameters of the present embodiment

[0041]

[0042] (3) The continuous casting slab obtained in this example was tested. The average value of the C range in the center of the slab was 0.042%, the proportion of central porosity ≤ 0.5 was 95%, and the proportion of central shrinkage ≤ 0.5 was 100%. The defect is 0.10%.

Embodiment 3

[0043] Embodiment 3: The continuous casting process for alleviating internal quality defects of bearing steel blooms is specifically described as follows.

[0044] (1) The section size of bearing steel GCr15 continuous casting slab is 200mm×200mm, the chamfering angle is 75°, and the chamfering slope length is 60mm; the main chemical composition of casting heat is (wt): C 1.05%, Si 0.35 %, Mn 0.36%, P 0.010%, S0.003%, Cr 1.65%.

[0045] (2) The main process parameters of continuous casting are shown in Table 6 and Table 7.

[0046] Table 6: Depression parameters of this embodiment

[0047]

[0048] Table 7: Continuous casting parameters of the present embodiment

[0049]

[0050] (3) The continuous casting slab obtained in this example is tested, the average value of C range in the center of the slab is 0.05%, the proportion of central porosity ≤ 0.5 is 90%, the proportion of central shrinkage ≤ 0.5 is 100%, and the corner The defect rate is 0.5%.

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
angleaaaaaaaaaa
Login to View More

Abstract

The invention discloses a continuous casting process capable of relieving internal quality defects of bearing steel boom. The continuous casting process adopts a large chamfering crystallizer, a chamfering angle of the obtained large chamfered continuously cast bloom is 50-75 degrees, and length of a chamfered inclined surface is 60-90 mm. The adopted following pressing-down process is as follows: at a pressed-down start point position, central solid fraction fs is 0.55-0.65, and pressing-down amount is 1.0-2.0 mm; at a second pressing-down roller, central solid fraction fs is 0.65-0.75 and pressing-down amount is 3.0-5.0 mm; at a third pressing-down roller, central solid fraction fs is 0.75-0.85, and pressing-down amount is 2.0-4.0 mm; at a fourth pressing-down roller, central solid fraction fs is 0.85-0.95, and pressing-down amount is 2.0-3.0 mm; and at a fifth pressing-down roller, central solid fraction fs is 0.95-1.0, and pressing-down amount is 0-2.0 mm. The continuous casting process reduces casting, rolling and pressing-down force in a casting blank pressing-down process, and improves pressing-down efficiency, so that the effects of stably controlling quality defects such as center segregation, V-shaped segregation, central loosening and hole shrinkage of the bearing steel boom are achieved.

Description

technical field [0001] The invention relates to a continuous casting process, in particular to a continuous casting process for alleviating internal quality defects of bearing steel blooms. Background technique [0002] CGr15 bearing steel is a high-carbon bearing steel with high carbon content and alloy content. Its solidification process has a wide two-phase zone, and the continuous casting slab is prone to defects such as center segregation, porosity, and shrinkage cavity; Large, the solidification time of the slab is prolonged, and the slab has a greater tendency to produce internal quality defects such as center segregation, V-shaped segregation, center porosity, and center shrinkage cavity. Quality defects such as center segregation, porosity, and shrinkage cavities of bearing steel slabs are difficult to be effectively eliminated in the later heating and rolling process. During hot rolling deformation, carbide enrichment bands are formed, and carbide bands are located...

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): B22D11/16B22D11/04
CPCB22D11/04B22D11/16
Inventor 王晓英田新中逯志方和红杰王刚党爱国赵昊乾孟耀青李永超黄翠环
Owner XINGTAI IRON & STEEL
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
Eureka Blog
Learn More
PatSnap group products