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Excellent-quality steel bar controlled rolling and cooling method

A technology of controlled rolling, controlled cooling, and steel rods, which is applied in the field of controlled rolling and controlled cooling in steel rolling production. It can solve problems such as the inability to meet the production needs of high-quality special steel bars, and achieve a wide range of device adaptability to pressure, ensure cooling strength, and apply flexible effects

Active Publication Date: 2017-09-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This bar controlled rolling and controlled cooling system belongs to the traditional bar controlled rolling and controlled cooling process layout, which cannot meet the production needs of high-quality special steel bars

Method used

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  • Excellent-quality steel bar controlled rolling and cooling method
  • Excellent-quality steel bar controlled rolling and cooling method
  • Excellent-quality steel bar controlled rolling and cooling method

Examples

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Effect test

Embodiment 1

[0037] Embodiment 1: Taking the GCr15 bearing steel round bar of the finished product Φ20mm as an example, the attached Figure 1-4 The application technology of the controlled rolling and controlled cooling process of excellent special steel bars arranged as an example to further describe the process method, in which the cooling water pressure is 1.0MPa, the water temperature is 30℃, and the attached figure 2 The length of the middle l cooler (12) ranges from 500-1000mm, with figure 2 The range of the short temperature recovery length (13) of middle LⅠ section is 1000-1800mm, with figure 2 The range of the long temperature recovery length (15) of middle L'Ⅱ section is 2400-3600mm. attached figure 1The middle rolling unit (1) has rolled the round steel with a specification of Φ45mm, the temperature is 1048°C, and the roller table speed is 2.9m / s, and the round steel is sent to the attached figure 1 The middle stage I controls the cooling zone (2) for cooling, and opens t...

Embodiment 2

[0038] Embodiment two: take the 60Si2MnA spring steel round bar of the finished product Φ30mm as an example, adopt the attached Figure 1-4 The application technology of the controlled rolling and controlled cooling process of excellent special steel bars arranged as an example to further describe the process method, in which the cooling water pressure is 1.0MPa, the water temperature is 30℃, and the attached figure 2 The length of the middle l cooler (12) ranges from 500-1000mm, with figure 2 The range of the short temperature recovery length (13) of middle LⅠ section is 1000-1800mm, with figure 2 The range of the long temperature recovery length (15) of middle L'Ⅱ section is 2400-3600mm. attached figure 1 The middle rolling unit (1) has rolled the round steel with a specification of Φ45mm, the temperature is 1042°C, and the roller table speed is 3.0m / s, and the round steel is sent to the attached figure 1 The middle stage I controls the cooling zone (2) for cooling, an...

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Abstract

The invention provides an excellent-quality steel bar controlled rolling and cooling method and belongs to the technical field of rolled steel production controlled rolling and cooling. The specific technological process comprises the step that controlled rolling and cooling of bars with the specification of the diameter being 12-70 mm adopts short cooling, I section short temperature resetting, short cooling, II section long temperature resetting, short cooling, interrupt cooling and temperature resetting circular control technology. Short cooling adopts a water cooling manner, I section controlled cooling, II section controlled cooling and III section controlled cooling adopt the short cooling manner, and the length of a cooler ranges from 500 mm to 1000 mm. Pressure of cooling water ranges from 0.5 MPa to 1.5 MPa, temperature resetting adopts an air cooling manner, the I section short temperature resetting length is 1000-1800 mm, and the II section long temperature resetting length is 2400-3600 mm. According to the method, on the basis of meeting mechanical performance of bars, the problem that in the traditional controlled rolling and cooling technology, a deeper quenched layer is generated on the surface layer is solved, generation of the quenched martensitic structure of the surface layer is effectively avoided, control over organization types is achieved, meanwhile, better uniformity of the surface layer and heart temperature is ensured, and the surface layer and heart temperature difference is smaller than or equal to 50 DEG C.

Description

technical field [0001] The invention belongs to the technology of controlled rolling and controlled cooling in steel rolling production, and provides a method for controlled rolling and controlled cooling of excellent special steel bars. Background technique [0002] Controlled rolling and controlled cooling technology has the advantages of improving the mechanical properties of bar products, reducing production costs, energy saving and environmental protection, and has broad application prospects. In the production of rebar, controlled rolling and controlled cooling can improve the mechanical properties of the product, reduce the content of alloy elements, and save production costs. In the production of plain carbon steel and low alloy steel, controlled rolling and controlled cooling can obtain ultra-fine grains and greatly improve mechanical properties. In the production of premium special steel, controlled rolling and controlled cooling can control the structure type, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74B21B45/02B21B1/16B21B15/00
CPCB21B1/16B21B15/0007B21B37/74B21B45/0203
Inventor 刘涛余伟陈雨来詹智敏何安瑞程知松
Owner UNIV OF SCI & TECH BEIJING
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