A kind of medium carbon nano-bainite ultra-high strength steel, steel bar and preparation method thereof
A nano-bainite and ultra-high-strength technology, applied in the field of metal materials, can solve the problems of long production cycle, poor comprehensive performance, poor plasticity, etc., and achieve the effects of shortened production cycle, low cost and improved efficiency
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Embodiment 1
[0031] According to the weight percentage of the chemical composition: C 0.58, Si 1.8, Mn 1.6, Mo 0.18, Ni 1.2, P 0.008, S0.005, the balance is Fe and unavoidable impurities, calculate the feeding ratio, melt with a vacuum induction furnace, and cast into A cylindrical ingot with a diameter of 180mm was remelted with a vacuum consumable arc at a melting rate of 2.0kg / min to obtain a consumable ingot. Heat the consumable ingot to 1200°C and keep it warm for 65 minutes for homogenization annealing. After coming out of the furnace, carry out hot rolling. The final rolling temperature of the hot rolling is controlled at 880°C. After rolling, it is slowly cooled to room temperature to obtain a hot-rolled billet with a diameter of 50mm; The hot-rolled billets are heated to 700°C for 15 hours for spheroidizing annealing, then cooled to 400°C with the furnace, and then air-cooled to room temperature to obtain annealed billets; the annealed billets are reheated to 880°C for 60 minutes a...
Embodiment 2
[0034] According to the chemical composition weight percentage of C 0.54, Si 1.7, Mn 1.9, Mo 0.24, Ni 1.63, P 0.005, S 0.002, the balance is Fe and unavoidable impurities, calculate the feeding ratio. It is melted in a vacuum induction furnace, cast into a cylindrical ingot with a diameter of 180 mm, and then remelted with a vacuum consumable arc at a melting rate of 2.0 kg / min to obtain a consumable ingot. Heat the consumable ingot to 1220°C and keep it warm for 55 minutes for homogenization annealing. After coming out of the furnace, carry out hot rolling. The final rolling temperature of hot rolling is controlled at 900°C. The rolled billet is heated to 690°C and kept for 15 hours for spheroidizing annealing, then cooled to 400°C with the furnace, and then air-cooled to room temperature to obtain annealed billet. Reheat the annealed billet to 890°C for 60 minutes and leave the furnace, quickly put it in a 620°C salt bath furnace for 5 minutes, take it out and quickly carry ...
Embodiment 3
[0037] According to the weight percentage of the chemical composition, it is C 0.52, Si 1.5, Mn 2.0, Mo 0.22, Ni1.7, P 0.007, S0.004, and the balance is Fe and unavoidable impurities. Calculate the feeding ratio, melt with a vacuum induction furnace, and cast A cylindrical ingot with a diameter of 180 mm was cast, and then vacuum consumable arc remelting was carried out at a melting rate of 2.0 kg / min to obtain a consumable ingot. Heat the consumable ingot to 1220°C and keep it warm for 60 minutes, perform homogenization annealing, and hot-roll it after it comes out of the furnace. Heat the hot-rolled billet to 680°C for 15 hours, then cool it to 400°C with the furnace, and air-cool it to room temperature to obtain an annealed billet; reheat the annealed billet to 900°C and keep it for 60 minutes, then put it in 620°C salt Keep it in the bath furnace for 5 minutes, take it out and carry out 3 passes of pass rolling quickly, the total deformation is controlled at 40%, the final...
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Abstract
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