A kind of high-strength cold-rolled steel strip for enamel and its preparation method
A cold-rolled steel strip and high-strength technology, which is applied in the field of high-strength enamel cold-rolled steel strip and its preparation, can solve the problems of enamelled steel with good formability, easy deformation, and poor formability of enamelled steel, so as to increase strength and improve Anti-scaling performance and good formability
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Embodiment 1
[0068] Embodiment 1: the chemical composition of billet is as follows table 5
[0069] The chemical composition of table 5 embodiment 1
[0070]
[0071] 1) The C content at the end point of converter smelting is 0.035%, and the temperature is: 1690°C. During the tapping process, low-carbon ferromanganese or metal manganese is used to mix manganese to about 0.14%. After tapping, add aluminum deoxidizer 300kg / furnace evenly on the slag surface, the aluminum deoxidizer contains 30% aluminum, if the converter is tapping slag, add some aluminum grains on the slag surface. The sliding plate is used to stop the slag to ensure that the thickness of the slag layer on the top of the ladle after tapping is not more than 100mm.
[0072] After the converter is tapped, use the RH refining furnace to decarburize the molten steel until the C content in the molten steel is 0.008. After the carbon content reaches the target composition, add Al for deoxidation, then add ferro-titanium for t...
Embodiment 2
[0090] The difference between embodiment 2 and embodiment 1 is:
[0091] The chemical composition of embodiment 2 billet is as follows table 9;
[0092] The chemical composition of table 9 embodiment 2
[0093]
[0094] The C content at the end point of converter smelting is 0.055%, the temperature is: 1700°C, and after tapping is completed, 200kg of aluminum deoxidizer is evenly added to the slag surface per furnace.
[0095] Rough rolling is carried out on the reheated steel slab. The starting temperature of the rough rolling is 1220°C. After the rough rolling, a hot coil box is used to keep warm and soak the intermediate billet to reduce the temperature difference between the head and the tail of the intermediate billet. The temperature of the intermediate billet is 1080°C. . Afterwards, finish rolling is carried out at a temperature above Ar3, the finish rolling temperature is 940°C, the temperature difference of the passing rod is controlled within 30°C, and the coil...
Embodiment 3
[0102] The difference between embodiment 3 and embodiment 1 is:
[0103] The chemical composition of embodiment 3 billet is as follows table 11;
[0104] The chemical composition of table 11 embodiment 3
[0105]
[0106] The C content at the end point of converter smelting is 0.04%, the temperature is 1695°C, and after tapping is completed, 250kg of aluminum deoxidizer is evenly added to the slag surface per furnace.
[0107] Rough rolling is carried out on the reheated steel slab, the rough rolling start temperature is 1200°C, after rough rolling, a hot coil box is used to keep warm and soak the intermediate billet, so as to reduce the temperature difference between the head and tail of the intermediate billet, the temperature of the intermediate billet is 1060°C . Afterwards, finish rolling is carried out at a temperature above Ar3, the finishing rolling temperature is 920°C, the temperature difference of the passing rod is controlled within 30°C, and the coiling tempe...
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Abstract
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