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Plate shape control method of online-quenched high-strength steel plate

A high-strength steel plate and shape control technology, applied in temperature control, rolling mill control device, heat treatment process control, etc., can solve problems such as increased bending degree, reduced yield, and large shape defects

Active Publication Date: 2019-01-25
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-strength steel in the online quenching process mainly has three problems: one is that after the high-strength steel plate is rolled, serpentine bends and other plate shape defects appear at the tail, and the degree of bending intensifies after online quenching, especially for production lines that are not equipped with pre-leveling machines. The plate shape defects are larger; the second is that the cooling intensity of the online quenching process is high, and the internal stress of the high-strength steel plate is complex and difficult to control, and there are plate shape defects such as convex, concave, warped head and tail, and pot shape; the third is the high-strength steel plate. When the temperature drops below 200°C, it cannot be leveled with a thermal straightening machine, and all shape defects can only be rescued or changed by heat treatment, which seriously increases the production cost and reduces the yield
Both methods do not mention the water ratio control scheme when the ambient temperature and water temperature change

Method used

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  • Plate shape control method of online-quenched high-strength steel plate
  • Plate shape control method of online-quenched high-strength steel plate
  • Plate shape control method of online-quenched high-strength steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The steel type of the high-strength steel plate in this embodiment is Q690D, and the thickness of the finished product is 40mm.

[0065] The main chemical composition of the high-strength steel plate in this example is by weight percentage: C: 0.15%, Si: 0.26%, Mn: 1.45%, P: 0.010%, S: 0.006%, Ni: 0.25%, Cr: 0.32% , Nb: 0.03%, V: 0.04%, Ti: 0.025%, Mo: 0.31%, B: 0.0015%, and the balance is Fe and unavoidable impurities.

[0066] Including the following steps:

[0067] 1. Heating: Heat the continuous casting slab in a heating furnace, the heating temperature is 1220°C, the heating rate is 9min / cm, and the temperature of the continuous casting slab is 1215°C.

[0068] 2. Descaling: Use the pre-descaler system to descale the heated continuous casting slab with high-pressure water, and the pressure of the high-pressure water is 25Mpa.

[0069] 3. Rolling: use double stands, roll in the two-phase area of ​​austenite recrystallization zone and austenite non-recrystallizatio...

Embodiment 2

[0075] The steel grade of the high-strength steel plate in this embodiment is Q690D, and the thickness of the finished product is 25 mm.

[0076] The main chemical components of the high-strength steel plate in this example are: C: 0.15%, Si: 0.21%, Mn: 1.25%, P: 0.010%, S: 0.006%, Cr: 0.24%, Nb: 0.028% , Ti: 0.023%, Mo: 0.26%, B: 0.0013%, and the balance is Fe and unavoidable impurities.

[0077] Including the following steps:

[0078] 1. Heating: Heat the continuous casting slab in a heating furnace, the heating temperature is 1220°C, the heating speed is 8min / cm, and the temperature of the continuous casting slab is 1220°C.

[0079] 2. Descaling: Use the pre-descaler system to descale the heated continuous casting slab with high-pressure water, and the pressure of the high-pressure water is 24.5Mpa.

[0080]3. Rolling: use double stands, roll in the two-phase area of ​​austenite recrystallization zone and austenite non-recrystallization zone, when rolling in the austenite...

Embodiment 3

[0086] The steel type of the high-strength steel plate in this embodiment is 550Mpa, and the thickness of the finished product is 60mm.

[0087] The main chemical composition of the high-strength steel plate in this example is by weight percentage: C: 0.13%, Si: 0.22%, Mn: 1.28%, P: 0.010%, S: 0.006%, Cr: 0.24%, Nb: 0.024% , Ti: 0.015%, Mo: 0.23%, B: 0.0012%, and the balance is Fe and unavoidable impurities.

[0088] Including the following steps:

[0089] 1. Heating: Heat the continuous casting slab in a heating furnace, the heating temperature is 1230°C, the heating rate is 9min / cm, and the temperature of the continuous casting slab is 1225°C.

[0090] 2. Descaling: Use the pre-descaler system to descale the heated continuous casting slab with high-pressure water, and the pressure of the high-pressure water is 25.5Mpa.

[0091] 3. Rolling: use double stands, roll in the two-phase area of ​​austenite recrystallization zone and austenite non-recrystallization zone, when roll...

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Abstract

The invention provides a plate shape control method of an online-quenched high-strength steel plate. The high-strength steel plate is formed by continuously casting blanks through the plate shape control method. The plate shape control method comprises the following steps of 1, heating, 2, descaling, 3, rolling, 4, online quenching, 5, retarded cooling and 6, tempering. The plate shape control method is applicable to a medium-thickness plate production line without arrangement of a pre-straightening machine, through a plate shape control technology, the plate shape quality of the online-quenched high-strength steel plate is improved, after tempering, the plate shape unevenness is controlled to be 7mm / 2m or below, hardening and tempering for remedy and size changing are avoided, the production cost is reduced, and the yield is increased.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a method for controlling the shape of an online quenched high-strength steel plate with a thickness of 20-80mm. Background technique [0002] The online quenching process of steel plate refers to the process of realizing direct quenching on the rolling line. The steel produced by the steel plate online quenching process has higher strength, toughness and hardenability than the steel produced by traditional quenching, which can greatly reduce the content of alloy elements and reduce carbon equivalent, improve welding and other process performance, and receive high efficiency and energy saving. The multiple effects of material and consumption reduction, so the online quenching technology is used more and more widely. [0003] Affected by the high strength and high cooling intensity of high-strength steel plates, the flatness of the plate shape is the main problem that plagues the p...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/84C21D6/00C21D8/02C21D9/00C21D11/00C22C38/02C22C38/04C22C38/22C22C38/26C22C38/28C22C38/32C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54B21B37/26B21B37/74
CPCB21B37/26B21B37/74C21D1/18C21D1/84C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0062C21D9/0081C21D11/005C22C38/002C22C38/02C22C38/04C22C38/22C22C38/26C22C38/28C22C38/32C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 尹训强周平张长宏秦港李涛石大勇罗君高张梅吕游
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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