Aluminum-containing cold rolling ultrahigh strength steel as well as preparation method and application thereof
An ultra-high-strength steel and overaging technology, which is applied in the field of short-term overaging heat treatment for the preparation of aluminum-containing cold-rolled ultra-high-strength steel, can solve the problems of long heat treatment process and unfavorable large-scale production, so as to improve product competitiveness and alloy cost. The effect of economy, good strength and plastic ratio
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Embodiment 1
[0046] The aluminum-containing cold-rolled ultra-high-strength steel of this embodiment has the following chemical composition in terms of mass percentage: C: 0.20, Mn: 2.0, Si: 1.24, Al: 0.46, Nb: 0.029, Ti: 0.058, P: ≤ 0.007, N: ≤0.006, O: ≤0.003, S: ≤0.005, and the rest are Fe and other unavoidable impurities.
[0047] Smelting based on the above ingredients to obtain a slab with a thickness of 100mm, and hot rolling according to the following process: heat the slab to 1200°C and keep it warm for 4 hours, and then roll it 7 times to obtain a hot-rolled plate with a thickness of 4.5mm , the starting rolling temperature is 1125°C, and the finishing rolling temperature is 875°C. The hot rolling adopts a 4-high reversing rolling mill for 7 passes of reciprocating rolling. The reduction rates are 20-30% respectively, that is, the reduction rates of the first two passes each time must be higher than those of the last five passes. After hot-rolling, water-cool to 650°C and put in...
Embodiment 2
[0050] The aluminum-containing cold-rolled ultra-high-strength steel of this embodiment has the following chemical composition in terms of mass percentage: C: 0.18, Mn: 1.5, Si: 1.0, Al: 0.3, Nb: 0.02, Ti: 0.2, P: ≤ 0.015, N: ≤0.006, O: ≤0.003, S: ≤0.005, and the rest are Fe and other unavoidable impurities.
[0051] Smelting based on the above components to obtain a slab with a thickness of 100mm, and hot rolling according to the following process: heating the slab to 1100°C and holding it for 3 hours, and rolling it 7 times to obtain a hot-rolled plate with a thickness of 4mm. The starting rolling temperature is 1050°C, and the final rolling temperature is 850°C. The hot rolling adopts a 4-high reversing rolling mill for 7 passes of reciprocating rolling. The reduction rates are 20-30%, that is, the reduction rates of the first two passes each time must be higher than those of the last five passes. After hot-rolling, air-cool to 650°C and put in asbestos for 8 hours, then c...
Embodiment 3
[0054] The aluminum-containing cold-rolled ultra-high-strength steel of this embodiment has the following chemical composition in terms of mass percentage: C: 0.22, Mn: 2.5, Si: 1.5, Al: 0.8, Nb: 0.04, Ti: 0.6, P: ≤ 0.015, N: ≤0.006, O: ≤0.003, S: ≤0.005, and the rest are Fe and other unavoidable impurities.
[0055] Smelting based on the above components to obtain a slab with a thickness of 100mm, and hot rolling according to the following process: heating the slab to 1200°C and holding it for 5 hours, and rolling it 7 times to obtain a hot-rolled plate with a thickness of 4mm. The starting rolling temperature is 1150°C, the final rolling temperature is 900°C, and the hot rolling adopts a 4-high reversing rolling mill for 7 passes of reciprocating rolling. The reduction rates are 20-30%, that is, the reduction rates of the first two passes each time must be higher than those of the last five passes. After hot-rolling, air-cool to 750°C and put in asbestos for 10 hours, then ...
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