Method for improving performance uniformity of thermo-mechanically rolled steel plate and thermo-mechanically rolled steel plate

A technology of thermomechanical rolling and uniformity, which is applied in metal rolling and other directions, can solve the problems of poor performance uniformity of thermomechanical rolled steel plates, achieve excellent performance uniformity, and improve the effect of performance uniformity

Inactive Publication Date: 2021-01-22
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of poor performance uniformity of the existing thermomechanically rolled steel plate, the present invention provides a method for improving the performance uniformity of the thermomechanically rolled steel plate, the method is stable and reliable, the steel plate has good shape and uniform performance high sex

Method used

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  • Method for improving performance uniformity of thermo-mechanically rolled steel plate and thermo-mechanically rolled steel plate
  • Method for improving performance uniformity of thermo-mechanically rolled steel plate and thermo-mechanically rolled steel plate

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Embodiment 1

[0050] The target thickness of the steel plate is 16mm, and the yield strength of the steel plate is 370MPa.

[0051] The chemical composition of the steel plate is designed according to mass percentage: C=0.10%, Si=0.25%, Mn=1.50%, P=0.010%, S=0.0015%, Cr=0.10%, Nb=0.03%, Ti=0.015%, The balance is Fe and other unavoidable impurities, and common precious elements such as Ni, Cu, V and Mo are not intentionally added.

[0052] The key process steps and parameters of steel plate thermomechanical rolling are as follows:

[0053] (1) Billet heating: the billet heating temperature is 1180°C, the continuous casting billet with a thickness of 200mm is selected, and the billet is in the furnace for 210 minutes:

[0054] (2) Controlled rolling: After the steel billet leaves the heating furnace, it enters the descaler for descaling, and then enters the rough rolling mill for rough rolling. Swing air cooling is carried out between passes; model rolling is used for finish rolling, and wh...

Embodiment 2

[0064] The thickness of the steel plate is 50mm, and the yield strength of the steel plate is 370MPa.

[0065] The chemical composition of the steel plate is designed according to mass percentage: C=0.09%, Si=0.25%, Mn=1.50%, P=0.010%, S=0.0010%, Cr=0.10%, Nb=0.03%, Ti=0.015%, The balance is Fe and other unavoidable impurities, and common precious elements such as Ni, Cu, V and Mo are not intentionally added.

[0066] The key process steps and parameters of steel plate thermomechanical rolling are as follows:

[0067] (1) Slab heating: the heating temperature of the slab is 1200°C, a 400mm continuous casting slab is selected, and the slab is in the furnace for 440 minutes;

[0068] (2) Controlled rolling: after the steel billet leaves the heating furnace, it enters the descaler for descaling, such as rough rolling in the rough rolling mill, the maximum pass reduction rate is 18.0%, and the thickness of the waiting temperature is 130mm. Swing air cooling between passes; model...

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Abstract

The invention provides a method for improving the performance uniformity of a thermo-mechanically rolled steel plate, and belongs to the technical field of thermo-mechanically rolled medium plates. The method comprises the following steps of heating a casting blank, roughly rolling, and adopting a low-speed heavy reduction process in a rough rolling stage; the casting blank comprises the followingchemical components of, in percentage by mass, 0.02%-0.08% of Nb, 1.4%-2.0% of Mn and less than or equal to 0.0025% of S; conducting finish rolling after completing the rough rolling, adopting modelsteel rolling in a finish rolling process, adopting odd passes in rolling passes, setting the initial rolling temperature ranging from 850 DEG C to 950 DEG C, and setting the rolling speed being 4.0 m/s; conducting finish rolling on a pre-straightened steel plate, specifically carrying out accelerated cooling treatment after pre-straightening, and adopting a head and tail shielding process with the acceleration range of 0.001 m/S<2>-0.01 m/S<2>. The invention further provides a thermo-mechanical rolled steel plate with high performance uniformity.

Description

technical field [0001] The invention belongs to the technical field of thermomechanically rolled medium and thick plates, and relates to a method for improving the performance uniformity of thermomechanically rolled steel plates and thermomechanically rolled steel plates. Background technique [0002] With the improvement of my country's steel rolling equipment level and the maturity of controlled rolling and controlled cooling technology, a new generation of thermomechanically rolled high-performance steel plates has lower production costs and good welding performance, gradually replacing heat treatment represented by normalizing and quenching and tempering. It is widely used in bridges, pipelines, high-rise buildings, ocean engineering and other fields. Although the thermomechanical rolled steel plate can give full play to technical means such as phase transformation strengthening, precipitation strengthening and dislocation strengthening under the composition design of low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21B1/22C21D8/02C22C38/04C22C38/12
CPCB21B1/22B21B2001/225B21C37/02C21D8/0205C21D8/0226C22C38/04C22C38/12
Inventor 黄乐庆王朦韩承良王彦锋杨永达狄国标马龙腾李群冯韦刘美艳王小勇
Owner SHOUGANG CORPORATION
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