Preparation method for hot-rolled steel plate

A hot-rolled steel plate and steel ingot technology, applied in the field of hot-rolled steel plate preparation, can solve the problems of poor toughness of continuous casting slab, deterioration of hot rolling performance and coating performance, and achieve good impact toughness

Inactive Publication Date: 2018-03-06
乔丽颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicon content of the existing TRIP steel is too high, which makes the toughness of the continuous casting slab of the steel plate poor, and deteriorates the hot rolling performance and coating performance of the steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Smelting low-carbon silicon steel into steel ingots, its composition by weight percentage is C0.13%, Mn1.4%, Si 0.4%, Al 0.4%, P≤0.006%, S≤0.005%, and the balance is Fe, and then the The steel ingot is heated to 1150±10°C, held for 4 hours, and forged into a billet;

[0013] Put the billet into the heating furnace at 800°C, heat it to 1150±10°C, and keep it warm for 1 hour; after the heat preservation is over, use a rolling mill to carry out rough rolling. The amount is 50%;

[0014] The rough-rolled steel plate is fine-rolled, the rolling temperature is 840°C, the final rolling temperature is 760°C, and the total deformation of the finishing rolling is 40%, to obtain the rolled piece;

[0015] The rolled piece was air-cooled to 650°C, water-cooled to 350°C, and air-cooled to room temperature after coiling to obtain a hot-rolled steel plate with a yield strength of 520MPa and a tensile strength of 640MPa.

Embodiment 2

[0017] Low-carbon silicon steel is smelted into steel ingots, the composition of which is C0.14%, Mn1.3%, Si 0.5%, Al 0.3%, P≤0.006%, S≤0.005%, and the balance is Fe, and then the The steel ingot is heated to 1150±10°C, held for 3 hours, and forged into a billet;

[0018] Put the billet into the heating furnace at 780°C, heat it to 1150±10°C, and keep it warm for 2 hours; after the heat preservation is over, use a rolling mill to carry out rough rolling, the starting temperature is 1100°C, the final rolling temperature is 1000°C, the total deformation The amount is 45%;

[0019] The steel plate after rough rolling is fine-rolled, the rolling temperature is 860°C, the final rolling temperature is 780°C, and the total deformation of the finishing rolling is 45%, to obtain the rolled piece;

[0020] The rolled piece was air-cooled to 660°C, water-cooled to 370°C, and air-cooled to room temperature after coiling to obtain a hot-rolled steel plate with a yield strength of 525MPa a...

Embodiment 3

[0022] Smelting low-carbon silicon steel into steel ingots, its composition by weight percentage is C 0.15%, Mn1.2%, Si 0.6%, Al 0.2%, P≤0.006%, S≤0.005%, the balance is Fe, and then the steel ingot Heating to 1150±10°C, holding the temperature for 3.5hr, and forging into a billet;

[0023] Put the billet into the heating furnace at 750°C, heat it to 1150±10°C, and keep it warm for 3 hours; after the heat preservation is over, use a rolling mill to carry out rough rolling, the starting temperature is 1060°C, the final rolling temperature is 900°C, and the total deformation The amount is 40%;

[0024] The rough-rolled steel plate is fine-rolled, the rolling temperature is 870°C, the final rolling temperature is 800°C, and the total deformation of the finishing rolling is 50%, to obtain the rolled piece;

[0025] The rolled piece was air-cooled to 670°C, water-cooled to 400°C, and air-cooled to room temperature after coiling to obtain a hot-rolled steel plate with a yield stren...

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Abstract

A method for preparing a hot-rolled steel plate, which is carried out according to the following steps: (1) Smelting low-carbon silicon steel into a steel ingot, the composition of which is C0.13-0.15% by weight percentage, Mn1.2-1.4%, and Si 0.4-0.6% , Al 0.2~0.4%, P≤0.006%, S≤0.005%, the balance is Fe, then heat the steel ingot to 1150±10°C and keep it warm for 3~4hr; (2) Heat the billet at 750~800°C Put it into a heating furnace, heat it to 1150±10°C, and keep it warm for 1~3hr; after the heat preservation is over, use a rolling mill for rough rolling; (3) fine-roll the rough-rolled steel plate; (4) air-cool to 650~670°C, Water cooled to 350~400°C, coiled. The invention realizes a good match between strength and plasticity of the TRIP steel plate; its brittle transition temperature is below -80°C, and its normal temperature impact energy reaches 120J, showing good impact toughness.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing a hot-rolled steel plate. Background technique [0002] The typical process route for producing TRIP steel plate is mainly divided into two types: hot rolling and cold rolling heat treatment. In the past two decades, the research fields of domestic and foreign scholars have mainly focused on the post-rolling critical annealing and bainite isothermal treatment of cold rolling heat treatment TRIP steel. ; while the research on hot-rolled TRIP steel has more practical significance in production, but there are few related reports; this is because hot-rolled TRIP steel requires a certain temperature range End cooling, which is difficult in production operation, needs to improve the operation technology and accurately determine the cooling temperature; and the production of hot-rolled TRIP steel does not require cold rolling and heat treatment after cold rolli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C21D8/02
CPCC22C38/04C21D8/0226C22C38/02C22C38/06
Inventor 乔丽颖
Owner 乔丽颖
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