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A method for controlling the shape of thin-gauge ultra-high-strength steel plate by dq process
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A control method, thin gauge technology, applied in contour control, manufacturing tools, metal rolling, etc., can solve problems such as DQ process non-instructive
Active Publication Date: 2022-07-01
武汉钢铁有限公司
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However, the process is still an offline adjustment process, which has no practical guiding significance for the DQ process
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Embodiment 1
[0029] The selected steel 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 3×1500mm. After fully austenitizing and rough rolling the cast billet, it is rolled into an intermediate billet with a thickness of 35mm, and then it is subjected to finishing rolling. The roughness of the steel plate is 5mm / 1000mm.
Embodiment 2
[0031] The selected steel 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 5×1700 mm. After fully austenitizing and rough rolling the cast billet, it is rolled into an intermediate billet with a thickness of 35mm, and then it is subjected to finishing rolling. The FT7 temperature is 870 ° C. The specific process of finishing rolling, cooling, and leveling is shown in Table 4-5. The unevenness is 8mm / 1000mm.
Embodiment 3
[0033] The selected steel is NM400 steel, 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, the balance is Fe , the rolling specification is 4 × 1600mm. After fully austenitizing and rough rolling the cast billet, it is rolled into an intermediate billet with a thickness of 35mm, and then it is subjected to finishing rolling. The FT7 temperature is 880 ℃. The specific process of finishing rolling, cooling, and leveling is shown in Table 4-5. The unevenness is 3mm / 1000mm.
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Abstract
The invention provides a method for controlling the shape of a thin-gauge ultra-high-strength steel plate in a DQ process, which includes: full-process shape control of rolling, cooling, and flat cross-cutting. The invention emphasizes the compensation strategy of micro-wave during rolling. After the steel coil is rolled, a subsection cooling mode is adopted to mainly reduce the cooling speed of the steel coil after rolling, so as to avoid poor plate deformation caused by excessive cooling speed. The steel coil should be flattened immediately within 48 hours after rolling, to avoid excessive work hardening of the steel plate, and to ensure the flattening effect and obtain a good shape. The thin-gauge high-strength steel produced by the invention has good plate shape quality, roughness is generally between 5mm / 1000mm-8mm / 1000mm, and the best can reach 2mm / 1000mm, and also has excellent toughness and formability. Compared with the traditional process adjustment process, it has the characteristics of short production process, high efficiency, low cost and strong market competitiveness.
Description
technical field [0001] The invention relates to a DQ (direct quenching, direct quenching after rolling) process for producing a thin-gauge ultra-high-strength steel plate shape control method, in particular to a plate of ultra-high-strength steel with a thickness specification of 3-5 mm, a width of ≤1700 mm, short process flow and low 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 of hot-rolled thin-gauge strip is particularly important. As an important index for judging the quality of hot-rolled strip, flatness has received more and more attention in recent years. However, the shape quality involves multiple processes such as heating, rough rolling, finishing rolling, cooling, leveling and cross-cutting. The influencing factors are complex and the control is difficul...
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