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Controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling

A technology of high-carbon chromium bearings and controlled cooling, applied in heat treatment process control, manufacturing tools, heat treatment furnaces, etc., can solve the problems of reducing the output of rolling mills, increasing production costs, prolong spheroidizing annealing time, etc., and achieve high yield, high Contact fatigue life, effect of shortening spheroidizing annealing time

Inactive Publication Date: 2009-05-20
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, in order to solve the problem of network carbides, the method of waiting for temperature before final rolling was adopted to achieve low-temperature final rolling, which greatly reduced the output of the rolling mill and deteriorated the production environment
And then a long spheroidizing annealing time is required. The spheroidizing annealing time is 20 to 22 hours, which not only increases the production cost, but also cannot obtain the ideal spheroidizing annealing structure, which has an adverse effect on the performance of the bearing steel.

Method used

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  • Controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling
  • Controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling
  • Controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] On-site production of φ95mm×8mm tube blanks in a steel plant

[0032] Brand: high carbon chromium bearing steel GCr15.

[0033] Heat number: 550 / 1692.

[0034] Heating temperature, piercing and final rolling temperature: Heating temperature: 1130-1150°C, the heated tube billet is sent to the φ76 piercing unit for primary piercing and secondary piercing, and the final rolling temperature after primary piercing is 1140-1160°C and secondary piercing The final final rolling temperature is 950-1030°C, and the temperature after the steel pipe hammer is 880-920°C, and then sent to the water cooler by the V-shaped conveying roller for the controlled cooling process.

[0035] Controlled cooling process: Four sets of water coolers are installed at certain intervals on the cooling line, the linear speed of the raceway is 0.7 m / s, water cooling and air cooling are carried out alternately, water cooling time: air cooling time = 1:4. The surface temperature of the steel pipe billet...

Embodiment 2

[0049] On-site production of φ86mm×6mm tube blanks in a steel plant

[0050] Brand: high carbon chromium bearing steel GCr15.

[0051] Furnace number: 550 / 1721.

[0052] Heating temperature, piercing finish rolling temperature: Heating temperature: 1120~1140℃, the heated tube billet is sent to φ76 piercing unit for primary piercing and secondary piercing, the final rolling temperature after primary piercing is 1120~1150℃ and secondary piercing The final final rolling temperature is 920-1010°C, and the temperature after the steel pipe hammer is 870-910°C, and then sent to the water cooler by the V-shaped conveying roller for controlled cooling process.

[0053] Control cooling process: install four sets of water coolers at certain intervals on the cooling line, the linear speed of the raceway is 0.85 m / s, water cooling and air cooling are performed alternately, water cooling time: air cooling time = 1:4. . The surface temperature of the steel pipe billet before entering the ...

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Abstract

The present invention belongs to the field of alloy steel and its making process, and is especially controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling. The cooling process includes the following steps: installing 4 water coolers in some interval on the cooling line and water cooling and air cooling the hot rolled pipe alternately in the V-shaped roll way; controlling the finishing temperature of rolled pipe blank to obtain single austenite structure before entering to the water coolers; ensuring the temperature of the hot rolled pipe blank before the first water cooler in 850-910 deg.c and the temperature leaving the fourth water cooler in 560+ / -20 deg.c; air cooling the pipe blank with surface temperature recovered to 650+ / -30 deg.c in the cooling bed; and fast spheroidizing annealing of the pipe blank. The present invention is superior to available technology.

Description

technical field [0001] The invention belongs to the field of alloy steel and its manufacturing process, and in particular relates to a controlled cooling process and a water cooler after hot-rolling of a high-carbon chromium bearing steel billet. Background technique [0002] In the existing technology, the controlled rolling and controlled cooling process of high carbon chromium bearing steel can be basically divided into three categories, the first category is high temperature rolling - controlled cooling; the second category is high temperature rolling - controlled cooling - isothermal rolling The third category is the low temperature rolling process. The isothermal rolling process of bearing steel must keep the temperature of the rolled piece constant, so it is necessary to increase the isothermal equipment, and the power and rigidity of the rolling mill are also required to be improved, so it is still difficult to practice in large-scale production. Low-temperature con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/08C21D8/10C21D11/00
Inventor 魏国能许达俞峰杨卯生
Owner CENT IRON & STEEL RES INST