High-strength steel plate and plate shape control method thereof

A high-strength steel plate and shape control technology, applied in the direction of roll speed control, temperature control, rolling mill control devices, etc., to achieve the effect of reasonable process system design, loose process system, and stable production

Active Publication Date: 2017-07-28
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not involve the shape control of thinner high-strength steel plates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A slab with a thickness of 250mm is used, and rolled into a steel plate with a thickness of 20mm. The heating time of the slab is 250 minutes, and the temperature of the furnace is 1230°C. The chemical composition (percentage by weight) of the slab is: C: 0.12%, Si: 0.3%, Mn: 1.6%, P: 0.017%, S: 0.006%, Als: 0.027%, Nb: 0.035%, V: 0.045% , Ti: 0.01%, Cr: 0.3%, Ca: 0.001%; ​​the balance is Fe and unavoidable impurities. Two-stage controlled rolling is adopted, the rolling thickness of the first stage is 250mm, and the rolling temperature of the first stage is 1220°C. In the first stage of high-temperature extension sequence rolling, the rolling speed is 2.5m / s, the biting speed is 1.3m / s, and the single-pass reduction rate during the first stage of high-temperature extension sequence rolling is 16.4% and 18.5% respectively , 23.1%, 25.6%, 27.7%. The final rolling temperature of the first stage is 1040°C, and the first stage has been rolled until the thickness of the in...

Embodiment 2

[0034] A slab with a thickness of 250mm is used, and rolled into a steel plate with a thickness of 25mm. The heating time of the slab is 360 minutes, and the temperature of the furnace is 1210°C. The chemical composition (percentage by weight) of the slab is: C: 0.14%, Si: 0.4%, Mn: 1.7%, P: 0.012%, S: 0.004%, Als: 0.017%, Nb: 0.045%, V: 0.055% , Ti: 0.02%, Cr: 0.4%, Ca: 0.0015%; the balance is Fe and unavoidable impurities. Two-stage controlled rolling is adopted, the rolling thickness of the first stage is 250mm, and the rolling temperature of the first stage is 1200°C. In the first stage of high-temperature extension sequence rolling, the rolling speed is 1.5m / s, the biting speed is 1.3m / s, and the single-pass reduction rate during the first stage of high-temperature extension sequence rolling is 15% and 17.7% respectively , 21.5%, 27.2%, 12%. The final rolling temperature of the first stage is 1056°C, and the first stage has been rolled until the thickness of the interme...

Embodiment 3

[0036] A slab with a thickness of 250mm was used, and rolled into a steel plate with a thickness of 22mm. The heating time of the slab was 328 minutes, and the temperature of the furnace was 1225°C. The chemical composition (percentage by weight) of the slab is: C: 0.13%, Si: 0.36%, Mn: 1.64%, P: 0.013%, S: 0.002%, Als: 0.023%, Nb: 0.041%, V: 0.052% , Ti: 0.012%, Cr: 0.35%, Ca: 0.0012%; the balance is Fe and unavoidable impurities. Two-stage controlled rolling is adopted, the rolling thickness of the first stage is 250mm, and the rolling temperature of the first stage is 1215°C. In the first stage of high-temperature extension sequence rolling, the rolling speed is 2.1m / s, the biting speed is 1.3m / s, and the single-pass reduction rate during the first stage of high-temperature extension sequence rolling is 15.5% and 17.8% respectively , 20.3%, 24.6%, 25.8%. The final rolling temperature of the first stage is 1063°C, and the first stage has been rolled until the thickness of ...

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Abstract

The invention relates to a high-strength steel plate and a plate shape control method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.05-0.07% of C, 0.25-0.35% of Si, 1.4-1.5% of Mn, 0.015% or less of P, 0.005% or less of S, 0.015-0.03% of Als, 0.03-0.04% of Nb, 0.001-0.0015% of Ca, and the balance of iron and inevitable impurities. According to the method, through appropriate heating, rolling, cooling and straightening technology design, the straightness of the steel plate can be guaranteed to meet requirements, and the degree of unstraightness of the steel plate is smaller than 3.2mm/m; and a cold straightening machine for re-straightening is not needed, so that manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a high-strength steel plate and a shape control method thereof. Background technique [0002] Structural steel plates with a yield strength of 690MPa are widely used in construction, engineering machinery and other fields. Structural steel plates with a yield strength of 690MPa generally contain more microalloys such as Nb and V in the composition design, and generally adopt non-recrystallization controlled rolling, and the rolled steel plates often have shape defects such as warping and waves. Especially for steel plates with thinner thickness specifications, this phenomenon is more serious. When the rolled steel plate is seriously uneven, when it is cooled by laminar flow, the cooling of various parts of the steel plate will be uneven. Due to the uneven cooling, the steel plate will be further deformed, which will cause serious deformation of the steel plate after cooling. Fla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/38C22C38/06C22C38/26C22C38/24C22C38/28C21D8/02B21C37/02B21B37/16B21B37/74B21B37/46B21B1/46
CPCB21B1/46B21B37/16B21B37/46B21B37/74B21C37/02C21D8/0226C22C38/002C22C38/02C22C38/06C22C38/24C22C38/26C22C38/28C22C38/38
Inventor 温利军薛越张大治李文彪徐建东赵超张满全戴鑫吕雪峰田君高军
Owner INNER MONGOLIA BAOTOU STEEL UNION
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