Rolling method controlling network carbide precipitation of large-section GCr15 bearing steel

A reticular carbide and bearing steel technology is used in the rolling field to control the precipitation of large-section GCr15 bearing steel reticulated carbides. Problems such as network carbide in the core of large section bearing steel

Active Publication Date: 2016-11-09
DAYE SPECIAL STEEL CO LTD
View PDF10 Cites 43 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) At present, the domestic control of GCr15 bearing steel reticulated carbide precipitation is mainly focused on ≤ The patented technology of network carbide control for the online rolling of large-section GCr15 bearing steel with specifications of Φ50~Φ90mm has never been reported.
[0010] (2) The heat treatment process (normalizing treatment) is an effective method for improving network carbides for small-sized bearing steel bars, but the effect of controlling network carbides for large-section bearing steel bars is not obvious, and increases the cost , not conducive to energy saving and environmental protection
[0011] (3) The large-section GCr15 bearing steel reticulated carbide controlled rolling and controlled cooling process is completely different from the small-sized GCr15 bearing steel reticulated carbide controlled rolling and controlled cooling process: first, the small-sized bearing steel has a small cross-section, and the core The surface temperature gradient is small, so the heat of the bearing steel can be taken away during rapid cooling, thereby suppres

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
  • Rolling method controlling network carbide precipitation of large-section GCr15 bearing steel
  • Rolling method controlling network carbide precipitation of large-section GCr15 bearing steel
  • Rolling method controlling network carbide precipitation of large-section GCr15 bearing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A rolling method for controlling the precipitation of large-section GCr15 bearing steel mesh carbides, comprising the following steps:

[0052] 1) Continuous casting slab heating: continuous casting slab preheating temperature 655°C, primary heating temperature 1060°C, secondary heating temperature 1220°C, soaking temperature 1215°C, total heating time 12 hours, high temperature diffusion time 6 hours;

[0053] 2) After the heated continuous casting slab is descaled by high-pressure water, rough rolling, intermediate rolling, and pre-finish rolling are sequentially carried out; the pressure of high-pressure water descaling is 28.5MPa; the starting temperature of rough rolling is 1085°C, and the rolling pass There are 6 passes, the finishing temperature of rough rolling is about 1040°C; The rolling start temperature is 962°C, the rolling pass is 4 passes, and the final rolling temperature of the pre-finish rolling is about 920°C; the size specification of the rolled piec...

Embodiment 2

[0060] A rolling method for controlling the precipitation of large-section GCr15 bearing steel mesh carbides, comprising the following steps:

[0061] 1) Continuous casting slab heating: continuous casting slab preheating temperature 670°C, primary heating temperature 1050°C, secondary heating temperature 1230°C, soaking temperature 1220°C, total heating time 12 hours, high temperature diffusion time 7 hours;

[0062] 2) After the heated continuous casting slab is descaled by high-pressure water, rough rolling, intermediate rolling, and pre-finish rolling are sequentially carried out; the pressure of high-pressure water descaling is 29MPa; the starting temperature of rough rolling is 1100°C, and the rolling pass is 6 passes, the finish rolling temperature of rough rolling is about 1060°C; The rolling temperature is 950°C; the rolling pass is 4 passes, and the final rolling temperature of the pre-finish rolling is about 920°C; the size specification of the rolled piece after in...

Embodiment 3

[0069] A rolling method for controlling the precipitation of large-section GCr15 bearing steel mesh carbides, comprising the following steps:

[0070] 1) Continuous casting slab heating: continuous casting slab preheating temperature 640°C, primary heating temperature 1067°C, secondary heating temperature 1224°C, soaking temperature 1220°C, total heating time 12 hours, high temperature diffusion time 8 hours;

[0071] 2) After the heated continuous casting slab is descaled by high-pressure water, rough rolling, intermediate rolling, and pre-finish rolling are sequentially carried out; the pressure of high-pressure water descaling is 29MPa; the starting temperature of rough rolling is 1095°C, and the rolling pass is 6 passes, the finish rolling temperature of rough rolling is about 1050°C; The rolling temperature is 935°C, the rolling pass is 4 passes, and the final rolling temperature of the pre-finish rolling is about 900°C; the size specification of the rolled piece after th...

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
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a rolling method controlling network carbide precipitation of large-section GCr15 bearing steel. According to the method, GCr15 continuous casting billet serves as raw materials; and the following working procedures of heating, decaling, rough rolling, intermediate rolling, pre-finish-rolling, first time of water penetrating cooling, finish rolling of a rod reducing and sizing mill, second time of water penetrating cooling, cooling of a cooling bed and final obtaining of finished product rods are sequentially included. By means of the method, the level of the obtained network carbide of the large-section GCr15 bearing steel is reduced to be smaller than or equal to level 2 from the original level larger than or equal to level 3, the comprehensive mechanical performance of high-carbon-chromium bearing steel is improved, the service life of a bearing is prolonged, besides, the production cost is reduced, and the market competitiveness of the bearing steel is improved.

Description

technical field [0001] The invention belongs to the field of special steel production and processing in the metallurgical industry, and relates to a rolling process, in particular to a rolling method for controlling the precipitation of reticular carbides in large-section GCr15 bearing steel. Background technique [0002] In recent years, my country's bearing industry has developed rapidly, and the bearing market has expanded rapidly, thereby driving a strong demand for bearing steel, making bearing steel a bright spot in my country's special steel market. Among the total amount of bearing steel, GCr15 bearing steel occupies most of the market, and it is widely used in the fields of automobile industry, machinery manufacturing, military industry, railway, aerospace and so on. However, due to the uneven distribution of carbides in GCr15 bearing steel, especially The existence of network carbides will increase the brittleness of steel and reduce the fatigue life of bearings, s...

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): C21D8/06
CPCC21D8/065
Inventor 李小龙周敦世周立新程卫国李德胜徐尚呈邹晖黄国飘
Owner DAYE SPECIAL STEEL CO LTD
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