Production method of quenched and tempered high-strength Q620F super-thick steel plate
A Q620F, extra-thick steel plate technology, applied in the field of iron and steel smelting, can solve the problems of low qualified rate of ultrasonic flaw detection of steel plates, steel plates cannot be used as structural parts, etc., to achieve the effect of easy process, simple process and reduced production cost.
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Embodiment 1
[0039] Example 1: Quenched and tempered high-strength Q620F extra-thick steel plate with a plate thickness of 100 mm.
[0040] The mass percentage of chemical composition of steel is: C=0.13, Si=0.30, Mn=1.48, P=0.010, S=0.001, Als=0.041, Nb=0.028, Ti=0.016, Ni=0.64, Cr=0.38, Mo= 0.36, B=0.0017, the balance is Fe and unavoidable impurities; CEV=0.57.
[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 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 out of the furn...
Embodiment 2
[0051] Example 2: Quenching and tempering high-strength Q620F extra-thick steel plate with a plate thickness of 120 mm was refined.
[0052] The chemical composition mass percentage of steel is:
[0053] C=0.13, Si=0.27, Mn=1.47, P=0.010, S=0.002, Als=0.036, Nb=0.018, Ti=0.017, Ni=0.61, Cr=0.40, Mo=0.38, B=0.0016, balance It is Fe and unavoidable impurities; CEV=0.57.
[0054] The production process steps and parameters of steel are:
[0055] (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).
[0056] (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 16°C higher than that of the lower surface, and the temperature of the core of the s...
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