Control method for improving plasticity of bearing steel wire rod

A control method and technology of bearing steel, which is applied in the field of bearing steel rolling process control, can solve the problems of unmentioned plasticity index and high capacity requirements, and achieve the effect of improving comprehensive mechanical properties, improving comprehensive properties, and uniform and fine grains

Active Publication Date: 2014-02-05
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The ubiquitous problem of high-carbon steel, especially high-carbon bearing steel, is that brittle fracture occurs after rolling or within a period of aging. %, the fracture is basically brittle
[0006] The above two methods have improved the service life of the bearing steel to varying degrees and reduced the carbide level of the b

Method used

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  • Control method for improving plasticity of bearing steel wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: The specification of the original wire rod of bearing steel is Φ6.5mm

[0018] Rolling process: the heating temperature of the heating furnace is 1140°C, the rolling start temperature is 1020°C, the first four passes of the rough rolling adopt head-off tension-free rolling, the inlet temperature of the rolling mill after head-off is 970°C, the inlet temperature of the pre-finishing mill is 950°C, the pre-finishing The cooling speed of the water cooling section between the rolling and finishing mills is 30°C / s, the finishing rolling temperature is 850°C, the cooling speed of the water cooling section after finishing rolling is 100°C / s, the spinning temperature is 800°C, and the opening of the first fan is 30% , Open the fifth insulation cover to the 18th insulation cover, and pack the rolls into the warehouse at a temperature below 440°C.

[0019] The test samples produced by this controlled cooling process took five metallographic test samples and tested the ...

Embodiment 2

[0020] Example 2: The specification of the original wire rod of bearing steel is Φ9.5mm

[0021] Rolling process: the heating temperature of the heating furnace is 1150°C, the rolling start temperature is 1030°C, the first four passes of rough rolling adopt head-off tension-free rolling, the inlet temperature of the rolling mill after head-off is 980°C, the inlet temperature of the pre-finishing mill is 960°C, the pre-finishing The cooling speed of the water cooling section before rolling and finishing rolling is 40°C / s, the finishing rolling temperature is 840°C, the cooling speed of the water cooling section before finishing rolling is 190°C / s, the spinning temperature is 790°C, the opening of the first fan is 50%, open the fifth insulation cover to the 18th insulation cover, and pack the rolls into the warehouse at a temperature below 440°C.

[0022] For the test samples produced by the controlled cooling process, five metallographic test samples and two laps of mechanical ...

Embodiment 3

[0023] Example 3: The specification of the original wire rod of bearing steel is Φ10.5mm

[0024] Rolling process: the heating temperature of the heating furnace is 1160°C, the rolling start temperature is 1050°C, the first four passes of the rough rolling adopt head-off tension-free rolling, the inlet temperature of the rolling mill after head-off is 990°C, the inlet temperature of the pre-finishing mill is 970°C, the pre-finishing The cooling speed of the water cooling section before rolling and finishing rolling is 60°C / s, the finishing rolling temperature is 830°C, the cooling speed of the water cooling section before finishing rolling is 180°C / s, the spinning temperature is 780°C, the opening of the first fan is 50%, open the fifth insulation cover to the 18th insulation cover, and pack the rolls into the warehouse at a temperature below 445°C.

[0025] For the test samples produced by the controlled cooling process, five metallographic test samples and two laps of mechan...

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Abstract

The invention discloses a control method for improving the plasticity of a bearing steel wire rod, belonging to the control field of a steel rolling process of bearing steel. The method adopts processes of temperature control rolling, low-temperature finish rolling, two-stage alternate control water cooling, low-temperature spinning and air cooling control; the low-temperature finish rolling is performed at 820-850 DEG C in an austenite single-phase re-crystallization region so that 95% of net carbide-level small-specification net carbon of the original wire rod of bearing steel is reduced to below the level 1, the tensile strength is 1,180-1,460Mpa, and the percentage reduction of area is improved to 20-25%; 90% of the net carbon level of a large-specification wire rod is reduced to below the level 1.0, the tensile strength is 1,200-1,350Mpa, and the percentage reduction of area is improved to 15-20%. By adopting the method disclosed by the invention, the net carbide of bearing steel is reduced, the percentage reduction of area of the bearing steel is improved, the service life of the bearing steel wire rod can be prolonged, the wear resistance of the steel is enhanced, the probability of brittle failure of the bearing steel is remarkably reduced, and the product yield is improved.

Description

technical field [0001] The invention relates to a control method for improving the comprehensive performance of bearing steel wire rods, belonging to the field of bearing steel rolling process control. It is suitable for reducing the level of reticular carbides in bearing steel and improving the plastic properties of bearing steel, especially for the production process control of improving the comprehensive mechanical properties of bearing steel. Background technique [0002] Bearing steel wire is the main material used to manufacture bearing rolling elements and various bearing parts. The mechanical properties of bearing steel, including plasticity indicators such as reticular carbide and area shrinkage, directly affect the wear resistance of rolling elements and various bearings. performance, fatigue cycle and other service life. [0003] The control of network carbides has always been a problem that technicians have worked hard to explore so far. The formation of network...

Claims

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Application Information

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IPC IPC(8): C21D8/06
Inventor 晁月林邓素怀王丽萍郑福印王立峰张慧峰李舒笳李三凯
Owner SHOUGANG CORPORATION
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