Superfine crystal particle hot-rolling steel plate with thick specification and production thereof
A technology of ultra-fine grain and hot-rolled steel plates, applied in metal rolling and other directions, can solve the problems of difficult process control, high price of alloy elements, high price, etc., and achieve the effect of good comprehensive performance, good cold bending performance and low cost
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[0009] Example 1:
[0010] Q235 plain carbon steel is smelted by a converter, and the weight percentage of the chemical composition of the steel includes: C: 0.13%, Si: 0.22%, Mn: 0.52%, P: 0.018%, S: 0.010%. The steel is cast into 200×(800~1200)×5500mm continuous casting slabs by conventional continuous casting methods, and the slabs are sent to the 1450mm hot continuous rolling mill for rolling. The heating, rolling and cooling are controlled in the whole process. The rolling process control is as follows:
[0011] a. Control the heating temperature of the continuous casting slab to 1180℃; b. The slab is rough-rolled at 970℃, and the rough rolling adopts six-pass rolling; c. The thickness of the intermediate slab after rough rolling is 31mm; d. Hot-rolled finish rolling The inlet temperature is 890℃; e. The finishing rolling adopts six stands for rolling; f. The cooling water is put into the three sets of stands; g. The exit temperature of the hot rolling finishing rolling is 81...
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[0013] Example 2:
[0014] Q235 carbon steel is smelted by a converter, and the weight percentage of the chemical composition of the steel includes: C: 0.15%, Si: 0.25%, Mn: 0.61%, P: 0.015%, S: 0.008%. The steel is cast into 200×(800~1200)×5500mm continuous casting slabs by conventional continuous casting methods, and the slabs are sent to the 1450mm hot continuous rolling mill for rolling. The heating, rolling and cooling are controlled in the whole process. The rolling process control is as follows:
[0015] a. Control the heating temperature of the continuous casting slab to 1200℃; b. The slab is rough-rolled at 980℃; c. The thickness of the intermediate slab after rough rolling is 34.5mm; d. The hot-rolling finish-rolling entrance temperature is 910℃; e , Finish rolling adopts five stands for rolling; f. Put cooling water between the four sets of stands; g. The exit temperature of the hot rolling finishing rolling is 830℃; h, the coiling temperature is 520℃.
[0016] The thic...
Example Embodiment
[0017] Example 3:
[0018] Q235 plain carbon steel is smelted by a converter, and the weight percentage of the chemical composition of the steel includes: C: 0.17%, Si: 0.25%, Mn: 0.68%, P: 0.015%, S: 0.009%. The steel is cast into 200×(800~1200)×5500mm continuous casting slabs by conventional continuous casting methods, and the slabs are sent to the 1450mm hot continuous rolling mill for rolling, and the whole process of heating, rolling and cooling is controlled. The hot rolling process control is as follows:
[0019] a. Control the heating temperature of the continuous casting slab to 1200℃; b. The slab is rough-rolled at 980℃; c. The thickness of the intermediate slab after rough rolling is 35.5mm; d. The hot-rolling finish-rolling entrance temperature is 920℃; e , Finish rolling adopts five stands for rolling; f. Put cooling water between the four sets of stands; g. The exit temperature of hot rolling finishing rolling is 830℃; h, the coiling temperature is 500℃.
[0020] The...
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