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A Control Method for Improving the Plasticity of 95crmo Hollow Steel

A control method and plasticity technology, applied in the control field of improving the plasticity of 95CrMo hollow steel, can solve the problems of high notch sensitivity and low plasticity of hollow steel

Active Publication Date: 2020-05-26
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a control method for improving the plasticity of 95CrMo hollow steel, which reaches or approaches the performance of normalizing treatment, and solves the problems of low plasticity and high notch sensitivity of hollow steel.

Method used

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  • A Control Method for Improving the Plasticity of 95crmo Hollow Steel
  • A Control Method for Improving the Plasticity of 95crmo Hollow Steel
  • A Control Method for Improving the Plasticity of 95crmo Hollow Steel

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The center of the square billet produced by electric furnace smelting, LF refining and continuous casting is drilled and then filled with core materials, and then rolled into hexagonal hollow steel bars through steps such as heating in a heating furnace, rolling, and controlled cooling. 1) Rolling: The rolling start temperature is 1025°C, the rough rolling is rolled in six passes in a tandem mill, and the inlet temperature of the tandem rolling mill is 950°C. Before entering the finishing mill, the surface of the billet is bright without obvious black spots. The finish rolling temperature is 845°C to obtain fine pearlite cluster size. 2) Controlled cooling: After finishing rolling and before the upper cooling bed, water cooling-recovery five-stage control is adopted, the cooling rate is 20°C / s, the network carbide is reduced, and the spacing of pearlite sheets is refined, and the temperature of the upper cooling bed is 750°C. The upper cooling bed is covered with a hea...

Embodiment 2

[0024] The center hole of the square billet produced by electric furnace smelting, LF refining and continuous casting is drilled and then filled with core material, and then rolled into hexagonal hollow steel rods through steps such as heating in a heating furnace, rolling, and controlled cooling. 1) Rolling: The rolling start temperature is 1005°C, the rough rolling is rolled in six passes in a tandem mill, and the inlet temperature of the tandem rolling mill is 935°C. Before entering the finishing mill, the surface of the billet is bright without obvious black spots. The entrance temperature of finish rolling is 835°C to obtain a fine pearlite cluster size. After finish rolling to before the upper cooling bed, water cooling-recovery five-stage control is adopted, and the cooling rate is 10°C / s to reduce network carbides and refine the spacing of pearlite sheets , The upper cooling bed temperature is 720°C. The upper cooling bed is covered with a heat preservation cover, and...

Embodiment 3

[0026] The center hole of the square billet produced by electric furnace smelting, LF refining and continuous casting is drilled and then filled with core material, and then rolled into hexagonal hollow steel rods through steps such as heating in a heating furnace, rolling, and controlled cooling. 1) Rolling: The rolling start temperature is 1045°C, the rough rolling is rolled in six passes in a tandem mill, and the entrance temperature of the tandem rolling mill is 965°C. Before entering the finishing mill, the surface of the billet is bright without obvious black spots. The finish rolling entrance temperature is 855°C to obtain fine pearlite cluster size. 2) Controlled cooling: after finishing rolling and before the upper cooling bed, water cooling-recovery five-stage control is adopted, the cooling rate is 25°C / s, the network carbide is reduced, and the spacing of pearlite sheets is refined, and the temperature of the upper cooling bed is 780°C. The upper cooling bed is co...

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Abstract

The invention relates to a control method for improving plasticity of hollow steel 95CrMo and belongs to the technical field of control of steel rolling processes of the hollow steel. The method comprises the steps: during rolling, an incipient rolling temperature is 1,000 DEG C to 1,050 DEG C, a feeding continuous rolling temperature is 930 DEG C to 970 DEG C, and an inlet temperature of finish rolling is 830 DEG C to 860 DEG C; after finish rolling, water cooling-restoring-water cooling-restoring cooling is adopted, an upper cold bed temperature is 700 DEG C to 780 DEG C, and a lower cold bed temperature is above 400 DEG C. The method has the advantages that the plasticity of the hollow steel 95CrMo is improved, the toughness of the hollow steel is improved, and the rock drilling life ofthe hollow steel is prolonged.

Description

technical field [0001] The invention belongs to the technical field of hollow steel rolling process control, in particular to a control method for improving the plasticity of 95CrMo hollow steel. It is suitable for reducing the reticular carbide of hollow steel, improving the plasticity of hollow steel, and improving the service life of hollow steel for rock drilling. Background technique [0002] Rock drilling tools are widely used in mining fields such as mines and coal mines. The entire drilling tool system includes four categories: drill rods, drill bits, connecting sleeves and drill tails. During rock drilling, the drill rod acts as a carrier for transferring energy, and the performance of its steel grade has a key influence on the fatigue life of the drill. According to the load characteristics of the drill rod when drilling, the drill rod can be selected from high-strength steel or medium-strength steel. The existing hollow steel grades mainly include 95CrMo, 55SiMn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06
CPCC21D8/065C21D2211/009
Inventor 邓素怀熊家泽张慧峰徐士新张吉舟王全礼刘厚权杨接明李舒笳
Owner SHOUGANG CORPORATION
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