Microalloy hot-rolled high-strength steel coil and preparation method thereof
A technology for micro-alloying and hot-rolled steel, applied in the field of steel coil manufacturing, can solve the problems of insufficient precipitation of micro-alloys and poor uniformity of the passing performance of steel coils, and achieve the effects of increasing the amount of precipitation and slowing down the cooling rate.
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[0043] The invention provides a method for preparing a microalloy hot-rolled high-strength steel coil, comprising the following steps:
[0044] Step 1: providing a continuously cast slab of microalloyed hot-rolled steel;
[0045] Step 2: Carry out rolling and laminar cooling to the continuous casting slab of the micro-alloyed hot-rolled steel, and control the final rolling temperature to be 850° C. to 870° C. to obtain a rolled steel plate. The thickness of the above-mentioned rolled steel plate is less than 12 mm (for example, 1.5 ~12mm);
[0046]Step 3: Inductively heating the rolled steel plate so that the temperature of the rolled steel plate is maintained at 610-630°C;
[0047] Step 4: coiling the steel plate after induction heating to obtain a steel coil to be cooled;
[0048] Step 5: putting the steel coil to be cooled into a slow cooling pit for cooling to obtain a micro-alloy hot-rolled high-strength steel coil.
[0049] It should be noted that after rolling in ste...
Embodiment 1
[0074] The continuous casting slab composition of micro-alloy hot-rolled high-strength steel coil is (mass percentage): C: 0.08%, Mn: 1.70%, Si: 0.16%, P: 0.011%, S: 0.002%, Nb: 0.03%, Ti: 0.08%, N: 0.0046%, Al S : 0.033%, the balance is Fe and unavoidable impurities. The soaking temperature of the heating furnace is 1250°C, the total time in the furnace is 183min, the rough rolling finish temperature is 1071°C; the finish rolling start temperature is 1045°C, the finish rolling finish temperature is 860°C, and the finish rolling reaches a thickness of 5.0mm; The temperature of the steel plate before entering the induction heating furnace is 578°C, and it is heated to 627°C by rapid induction, the heating rate is 50°C / s, the coiling temperature is 624°C, and the performance is tested after being slowly cooled in the slow cooling pit for 72 hours after rolling.
[0075] According to the steel plate produced in the steps of the present embodiment, its performance index is shown ...
Embodiment 2
[0083] The continuous casting slab composition of micro-alloyed hot-rolled high-strength steel coil is (mass percentage): C: 0.08%, Mn: 1.70%, Si: 0.15%, P: 0.010%, S: 0.003%, Mo: 0.21%, Ti+ Nb+V: 0.215%, N: 0.0043%, Al S : 0.040%, the balance is Fe and unavoidable impurities. The soaking temperature of the heating furnace is 1263°C, the total time in the furnace is 261min, the finish rolling temperature of the rough rolling is 1113°C; the start rolling temperature of the finish rolling is 1067°C, the finish rolling temperature is 867°C, and the finish rolling reaches a thickness of 3.0mm; The temperature of the steel plate before entering the induction heating furnace is 583°C, and it is heated to 623°C by rapid induction, the heating rate is 50°C / s, the coiling temperature is 618°C, and the performance is tested after being slowly cooled in the slow cooling pit for 72 hours after rolling.
[0084] The performance indexes of the steel plate produced according to the steps of...
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