Production method of quenched and tempered high-strength Q500F super-thick steel plate
A technology of extra-thick steel plate and production method, which is applied in the field of iron and steel smelting, can solve the problems that the steel plate cannot be used as a structural part, and the pass rate of ultrasonic flaw detection of the steel plate is low, so as to achieve the effect of easy process, simple process and reduced production cost
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Embodiment 1
[0039] Example 1: Quenching and tempering high-strength Q500F extra-thick steel plates with a plate thickness of 100 mm were refined.
[0040] The mass percentage of chemical composition of steel is: C=0.13, Si=0.26, Mn=1.10, P=0.010, S=0.001, Al s =0.041, Nb=0.030, Ti=0.015, V=0.046, Ni=0.50, Cr=0.40, Mo=0.51, B=0.0018, the balance is Fe and unavoidable impurities; CEV=0.54.
[0041] The production process steps and parameters of steel are:
[0042] (1) Continuous casting: Produce 300X2280mm cross-section continuous casting slabs according to the clean steel production method, in which the superheat of the continuous casting tundish is less than 10°C, the light reduction is 4mm, and the electromagnetic stirring current is controlled by 300A (7Hz).
[0043] (2) Heating: The slab is heated at 1290-1300°C, the heating time is 11min / cm, the soaking time is 70min, the temperature of the upper surface is 16°C higher than that of the lower surface, and the temperature of the core o...
Embodiment 2
[0051] Example 2: Quenching and tempering high-strength Q500F extra-thick steel plate with a plate thickness of 120 mm.
[0052] The mass percentage of chemical composition of steel is: C=0.13, Si=0.24, Mn=1.10, P=0.011, S=0.001, Al s =0.043, Nb=0.030, Ti=0.017, V=0.045, Ni=0.49, Cr=0.41, Mo=0.52, B=0.0017, the balance is Fe and unavoidable impurities; CEV=0.56.
[0053] The production process steps and parameters of steel are:
[0054] (1) Continuous casting: Produce 300X2280mm cross-section continuous casting slabs according to the clean steel production method, in which the superheat of the continuous casting tundish is less than 10°C, the light reduction is 4mm, and the electromagnetic stirring current is controlled by 300A (7Hz).
[0055] (2) Heating: The slab is heated at 1290-1300°C, the heating time is 12min / cm, the soaking time is 65min, the temperature of the upper surface is 17°C higher than that of the lower surface, and the temperature of the core of the slab is ...
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