Temperature control rolling method for Q345 steel plate

A temperature-controlled rolling and steel plate technology, applied in temperature control, metal rolling, etc., can solve problems such as increased anisotropy and reduced impact toughness at room temperature, and achieve uniform center temperature, uniform deformation, and increased production.

Inactive Publication Date: 2011-08-17
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3) Controlled rolling in the two-phase region: when the rolled material is deformed in the two-phase region, elongated recrystallized austenite grains and work-hardened ferrite grains are formed. The mixed structure of polygonal ferrite grains produced by austenite grain transformation and deformed hard ferrite grains improves the strength and low-temperature toughness of the material, but the anisotropy of the material increases and the normal temperature Reduced impact toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The temperature-controlled rolling method of Q345 steel plate comprises the following steps:

[0025] 1) Heating:

[0026] The Q345 steel slab is preheated at 700°C for 1 hour in a pusher-type heating furnace, heated at 1150°C for 1.5 hours, soaked at 1150°C for 1 hour, and then released from the furnace. It is dephosphorized and scaled by high-pressure water at 18MPa pressure, and then quickly transported within 1 minute to rolling mill;

[0027] 2) Recrystallization rolling in the first stage:

[0028] The Q345 steel slab is rolled at 1045°C in the first stage, and rolled for 8 passes. The total deformation is 60%, and the deformation amount of each pass is 10-15%. The temperature drop range during the rolling process is 50-70°C , and then air-cooled for 5 minutes;

[0029] 3) Rolling in the non-recrystallized zone of the second stage

[0030] When the Q345 steel slab is lowered to 940°C, the second-stage rolling is carried out, and 7 passes of rolling are carried...

Embodiment 2

[0032] The temperature-controlled rolling method of Q345 steel plate comprises the following steps:

[0033] 1) Heating:

[0034] The Q345 steel slab is preheated at 800°C for 1.5h in a pusher-type heating furnace, heated at 1100°C for 2h, soaked at 1150°C for 1h, and then released from the furnace. It is dephosphorized and scaled by high-pressure water at 18MPa pressure, and then transported within 1.5 minutes to rolling mill;

[0035] 2) Recrystallization rolling in the first stage:

[0036] The Q345 steel slab is rolled at 1040°C in the first stage, and rolled for 7 passes, with a total deformation of 50%, and a deformation of 10-15% per pass. The temperature drop range during rolling is 50-70°C , and then air-cooled for about 5 minutes;

[0037] 3) Rolling in the non-recrystallized zone of the second stage

[0038] When the Q345 steel slab is lowered to 950°C, the second-stage rolling is carried out, and the rolling is carried out for 6 passes. The total deformation is...

Embodiment 3

[0040] The temperature-controlled rolling method of Q345 steel plate comprises the following steps:

[0041] 1) Heating:

[0042] The Q345 steel slab is preheated at 750°C for 1 hour in a pusher-type heating furnace, heated at 1150°C for 1.5 hours, soaked at 1150°C for 1 hour, and then released from the furnace. It is dephosphorized and scaled by high-pressure water at 18MPa pressure, and then transported within 2 minutes to rolling mill;

[0043] 2) Recrystallization rolling in the first stage:

[0044] The Q345 steel slab is rolled at 1010°C in the first stage, and the rolling is carried out for 8 passes. The total deformation is 60%, and the deformation amount of each pass is 10-15%. The temperature drop range during the rolling process is 50-70°C , and then air-cooled for 3 minutes;

[0045] 3) Rolling in the non-recrystallized zone of the second stage

[0046] When the Q345 steel slab is lowered to 950°C, the second-stage rolling is carried out, and 6 passes of rollin...

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PUM

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Abstract

The invention discloses a temperature control rolling method for a Q345 steel plate. The method comprises the following steps of: after the Q345 steel plate blank passes through a preheating section, a heating section and a soaking section in a steel pushing heating furnace, discharging and removing oxide skin; performing first-stage rolling at the temperature of between 1,000 and 1,050 DEG C, wherein the total deformation is 50 to 60 percent, and then performing air cooling or water cooling for temperature reduction; and when the temperature is reduced to 900 to 950 DEG C, performing secondary-stage rolling, wherein the total deformation is 20 to 40 percent, and the rolling temperature is 800 to 850 DEG C, and then performing water-cooling or air-cooling quickly. In the method, the first-stage and second-stage control rolling is adopted, namely recrystallization area rolling and non-recrystallization area rolling are combined; large processing deformation is performed on an austenite recrystallization area at high temperature, and austenite recrystallization grains are refined by the repeated deformation and recrystallization of austenite grains; and in rolling process after the temperature is reduced, the full deformation is performed on a non-recrystallization area, and on the premise of guaranteeing the total deformation of the austenite recrystallization area, single-pass large deformation rolling is realized.

Description

technical field [0001] The invention belongs to the technical field of controlled rolling of steel alloys, in particular to a temperature-controlled rolling method of a Q345 steel plate. Background technique [0002] Low-alloy steel Q345B is based on ordinary carbon steel by adding Nb, V, and Ti elements to form carbon, nitrogen or carbonitride compounds, which improves the strength but reduces the toughness. The conventional hot rolling method can only obtain steel plates of a certain shape and size, and the role of the alloy elements has not been fully exerted, and better comprehensive properties must be obtained after normalizing; and the use of controlled rolling not only through hot working Make the steel plate obtain the specified shape and size, and fully refine the grains of the steel plate and improve its structure through high-temperature deformation. Controlled rolling not only retains the function of conventional hot rolling, but also plays the role of normalizin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/30B21B37/74
Inventor 周玉川党鹏杨利张晓卫李鹏李伟王红波王瑞琴高维娜付文洁谢英杰王蕊宁吕利强李辉张清
Owner WESTERN TITANIUM TECH
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