Super-thick steel plate for container ships and preparation method of super-thick steel plate
A technology for extra-thick steel plates and container ships, which is applied in the field of metallurgy, can solve the problems of brittle cracks, poor low-temperature toughness, etc.
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Embodiment 1
[0029] The proportions of each component of the 70mm large thickness container ship steel of the present embodiment are as follows:
[0030] C: 0.080%, Si: 0.35%, Mn: 1.55%, P: 0.0080%, S: 0.0011%, Ni: 0.45%, Nb: 0.025%, V: 0.045%, Ti: 0.020%, Alt: 0.035%, The rest is Fe and unavoidable impurities.
[0031] Among them, the content of impurities is controlled at O≤0.0015%, N≤0.0050%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.
[0032] During the preparation, the low-phosphorus-sulfur smelting process is adopted, and other trace alloy elements are used to effectively enhance the lamellar tear resistance and brittle crack arrest performance of the steel. Controlled rolling and controlled cooling technology is used to ensure uniform structure and performance of the steel plate, and to obtain large-thickness container ship steel with excellent tearing performance and crack arrest performance. The main process route is: hot metal desulfurization pretreatment→converter ...
Embodiment 2
[0036] The proportions of each component of the large-thickness container ship steel of the present embodiment are as follows:
[0037] C: 0.056%, Si: 0.45%, Mn: 1.64%, P: 0.0078%, S: 0.0013%, Ni: 0.55%, Nb: 0.045%, V: 0.038%, Ti: 0.019%, Alt: 0.033%, The rest is Fe and unavoidable impurities.
[0038] Among them, the content of impurities is controlled at O≤0.0015%, N≤0.0050%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.
[0039] During the preparation, the low-phosphorus-sulfur smelting process is adopted, and other trace alloy elements are used to effectively enhance the lamellar tear resistance and brittle crack arrest performance of the steel. Controlled rolling and controlled cooling technology is used to ensure uniform structure and performance of the steel plate, and to obtain large-thickness container ship steel with excellent tearing performance and crack arrest performance. The main process route is: hot metal desulfurization pretreatment→converter smeltin...
Embodiment 3
[0043] The proportions of each component of the large-thickness container ship steel of the present embodiment are as follows:
[0044] C: 0.096%, Si: 0.34%, Mn: 1.48%, P: 0.0068%, S: 0.0012%, Ni: 0.48%, Nb: 0.034%, V: 0.040%, Ti: 0.022%, Alt: 0.035%, The rest is Fe and unavoidable impurities.
[0045] Among them, the content of impurities is controlled at O≤0.0015%, N≤0.0050%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.
[0046] During the preparation, the low-phosphorus-sulfur smelting process is adopted, and other trace alloy elements are used to effectively enhance the lamellar tear resistance and brittle crack arrest performance of the steel. Controlled rolling and controlled cooling technology is used to ensure uniform structure and performance of the steel plate, and to obtain large-thickness container ship steel with excellent tearing performance and crack arrest performance. The main process route is: hot metal desulfurization pretreatment→converter smelt...
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