Ultrahigh steel Q960E thick plate and manufacturing method
A manufacturing method and ultra-high technology, applied in the field of ultra-high-strength steel Q960E thick plate and manufacturing, can solve the problems of ultra-high-strength steel without substantive reports, minimal practical engineering application of products, prone to engineering accidents, etc., so as to reduce overheating. Sensitivity, reduction of hardenability, effect of improving weldability
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Embodiment 1
[0030] A kind of ultra-high steel Q960E thick plate provided in this embodiment, its chemical composition and mass percentage are as follows: C: 0.16%, Si: 0.24%, Mn: 1.13%, P≤0.008%, S≤0.002%, Cr: 0.45 %, Mo: 0.50%, Ni: 0.91%, Ti: 0.020%, Nb: 0.025%, B: 0.0016%, and the rest are Fe and unavoidable impurities.
[0031] The manufacturing method of the above-mentioned steel plate comprises the following steps: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab slow cooling-slab heating-phosphorus removal-rolling-air cooling-flaw detection-shot blasting-quenching-back Fire-straightening-cutting-sampling-printing logo-inspection-warehousing,
[0032]The molten steel smelted according to the ratio is vacuum degassed and then continuously cast. The thickness of the continuous casting slab is 320mm. The steel slab is heated to a furnace temperature of 1180°C and kept for 350 minutes. Rolling, in which the rolling in the recrystallization...
Embodiment 2
[0034] A kind of ultra-high steel Q960E thick plate provided in this embodiment, its chemical composition and mass percentage are as follows: C: 0.17%, Si: 0.28%, Mn: 1.24%, P≤0.008%, S≤0.002%, Cr: 0.43 %, Mo: 0.48%, Ni: 0.95%, Ti: 0.016%, Nb: 0.027%, B: 0.0017%, and the rest are Fe and unavoidable impurities.
[0035] The molten steel smelted according to the ratio is vacuum degassed and then continuously cast. The thickness of the continuous casting slab is 320mm. The steel slab is heated to a furnace temperature of 1200°C and kept for 345 minutes. Rolling, in which the rolling in the recrystallization area requires a pass reduction rate of more than 12%, the final rolling temperature in the recrystallization area is 1035°C, the rolling in the non-recrystallization area requires a cumulative reduction rate of more than 40%, and the starting rolling temperature is 930°C. ℃, the final rolling temperature is 900 ℃, the final rolling thickness of the steel plate is 90mm, air-coo...
Embodiment 3
[0037] A kind of ultra-high steel Q960E thick plate provided in this embodiment, its chemical composition and mass percentage are as follows: C: 0.16%, Si: 0.25%, Mn: 1.10%, P≤0.008%, S≤0.0015%, Cr: 0.44 %, Mo: 0.50%, Ni: 0.92%, Ti: 0.015%, Nb: 0.026%, B: 0.0016%, and the rest are Fe and unavoidable impurities.
[0038] The molten steel smelted according to the ratio is vacuum degassed and then continuously cast. The thickness of the continuous casting slab is 320mm. The steel slab is heated to a furnace temperature of 1220°C and kept for 345 minutes. Rolling, in which the rolling in the recrystallization area requires a pass reduction rate of more than 12%, the final rolling temperature in the recrystallization area is 1040°C, the rolling in the non-recrystallization area requires a cumulative reduction rate of more than 40%, and the starting rolling temperature is 915°C. ℃, the final rolling temperature is 890 ℃, the final rolling thickness of the steel plate is 90mm, air-co...
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