Wide slab longitudinal crack control process
A longitudinal crack and slab technology, which is applied in the field of longitudinal crack control of wide slabs, can solve the problems of longitudinal cracks, width and thickness of wide slabs, and achieve the effect of reducing the possibility of cracks.
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Embodiment 1
[0017] Embodiment 1: A wide slab longitudinal crack control process provided in this embodiment includes:
[0018] In the continuous casting process, steel grades with a manganese-sulfur ratio of 30 are used when the carbon mass fraction is in the range of 0.10% to 0.16%;
[0019] Use mold flux with an alkalinity within the range of 1.19, and set the melting point of the mold flux to be 30°C lower than the melting point of conventional slabs and thick slabs;
[0020] Control the cooling intensity of the wide side of the crystallizer to 5100L / min, and the narrow side to 250L / min, set the water inlet temperature of the crystallizer to 31°C, and set the water flow rate in the crystallizer to 6m / s;
[0021] The overall taper of the crystallizer was set at 1.05% / m.
Embodiment 2
[0022] Embodiment 2: A wide slab longitudinal crack control process provided in this embodiment includes:
[0023] In the continuous casting process, steel grades with a manganese-sulfur ratio of 33 are used when the carbon mass fraction is in the range of 0.10% to 0.16%;
[0024] Use mold flux with an alkalinity within the range of 1.26, and set the melting point of the mold flux to be 40°C lower than that of conventional slabs and thick slabs;
[0025] Control the cooling intensity of the wide surface of the crystallizer to 5200L / min, and the narrow surface to 300 L / min, set the water inlet temperature of the crystallizer to 35°C, and set the water flow rate in the crystallizer to 7m / s;
[0026] The overall taper of the crystallizer was set at 1.10% / m.
Embodiment 3
[0027] Embodiment 3: A wide slab longitudinal crack control process provided in this embodiment includes:
[0028] In the continuous casting process, steel grades with a manganese-sulfur ratio of 35 are used when the carbon mass fraction is in the range of 0.10% to 0.16%;
[0029] Use mold flux with an alkalinity within the range of 1.31, and set the melting point of the mold flux to be 50°C lower than the melting point of conventional slabs and thick slabs;
[0030] Control the cooling intensity of the wide side of the crystallizer to 5300L / min, and the narrow side to 350 L / min, set the water inlet temperature of the crystallizer to 39°C, and set the water flow rate in the crystallizer to 8m / s;
[0031] The overall taper of the crystallizer was set at 1.10% / m.
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