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Control method for shape of DQ process thin-gauge ultrahigh-strength steel plate

A control method and shape control technology, applied in the field of hot-rolled steel plate production, can solve problems such as the lack of guiding significance of DQ process

Active Publication Date: 2021-10-22
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is still an offline adjustment process, which has no practical guiding significance for the DQ process

Method used

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  • Control method for shape of DQ process thin-gauge ultrahigh-strength steel plate
  • Control method for shape of DQ process thin-gauge ultrahigh-strength steel plate
  • Control method for shape of DQ process thin-gauge ultrahigh-strength steel plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The selected steel type is NM360 steel, its chemical composition is: 0.14%C, 1.80%Mn, 1.20%Si, P≤0.010%, S<0.005%, 0.5%Al, 0.02%Ti, the balance is Fe, rolling specifications It is 3×1500mm. After the slab is fully austenitized and rough-rolled, it is rolled into an intermediate slab with a thickness of 35mm, and then enters finish rolling. The FT7 temperature is 890°C. The specific processes of finish rolling, cooling, and leveling are shown in Table 4-5. The unevenness of the steel plate is 5mm / 1000mm.

Embodiment 2

[0031] The selected steel type is NM450 steel, and its chemical composition is: 0.20%C, 1.50%Mn, 1.20%Si, P≤0.010%, S<0.005%, 0.5%Al, 0.015%Ti, 0.20%Cr, 0.002%B, The balance is Fe, and the rolling specification is 5×1700mm. After the slab is fully austenitized and rough-rolled, it is rolled into an intermediate slab with a thickness of 35mm, and then enters finish rolling. The FT7 temperature is 870°C. The specific processes of finish rolling, cooling, and leveling are shown in Table 4-5. Steel plate The unevenness is 8mm / 1000mm.

Embodiment 3

[0033] The selected steel type is NM400 steel, and its chemical composition is: 0.18%C, 1.80%Mn, 0.15%Si, P≤0.010%, S<0.005%, 0.2%Ti, 0.40%Cr, 0.002%B, and the balance is Fe , The rolling specification is 4×1600mm. After the slab is fully austenitized and rough-rolled, it is rolled into an intermediate slab with a thickness of 35mm, and then enters finish rolling. The FT7 temperature is 880°C. The specific processes of finish rolling, cooling, and leveling are shown in Table 4-5. Steel plate The unevenness is 3mm / 1000mm.

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Abstract

The invention provides a control method for the shape of a DQ process thin-gauge ultrahigh-strength steel plate. The control method comprises the whole-process plate shape control of rolling, cooling and flat transverse cutting. According to the method, a micro-medium wave compensation strategy during rolling is emphasized; and after the steel coil is rolled, a subsection cooling mode is adopted, the cooling speed after the steel coil is rolled is mainly decelerated, and plate deformation difference caused by too high cooling speed is avoided. The steel coil is immediately flattened within 48 hours after being rolled, excessive work hardening of the steel plate is avoided, the flattening effect is guaranteed, and an excellent plate shape is obtained. The thin-gauge high-strength steel produced by the method provided by the invention is good in plate shape quality, the unevenness generally ranges from 5 mm / 1000 mm to 8 mm / 1000 mm, and can optimally reach 2 mm / 1000 mm, and the thin-gauge high-strength steel further has excellent toughness and forming performance. Compared with a traditional adjusting process, the method has the characteristics of short production flow, high efficiency, low cost, strong market competitiveness and the like.

Description

technical field [0001] The invention relates to a method for controlling the shape of thin ultra-high-strength steel plates produced by DQ (direct quenching, direct quenching after rolling) technology, especially a ultra-high-strength steel plate with a thickness specification of 3-5mm and a width of ≤1700mm, which is short in process and low in cost. A shape control method belongs to the technical field of hot-rolled steel plate production. Background technique [0002] As hot-rolled products continue to expand toward the limit of higher strength and thinner thickness, the shape control technology performance of hot-rolled thin-gauge strip steel is particularly important. Flatness, as an important index to judge the quality of hot-rolled strip steel, has received more and more attention in recent years. However, the shape quality involves multiple processes such as heating, rough rolling, finish rolling, cooling, leveling, and cross-cutting. The influencing factors are com...

Claims

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Application Information

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IPC IPC(8): B21B37/38B21B37/44B21B45/02B21B15/00
CPCB21B37/38B21B37/44B21B45/0218B21B15/00
Inventor 尹云洋张鹏武何亚元袁金胡唐国徐锋王立新魏兵
Owner 武汉钢铁有限公司