Low-compression-ratio high-performance Q345R super-wide extremely thick container steel and manufacturing method thereof
A technology with a low compression ratio and a manufacturing method, which is applied in the field of high-performance Q345R ultra-wide and extra-thick container steel, can solve the problems of limited environmental temperature of the container, achieve excellent strength and Z-direction performance, uniform mechanical properties, and short production cycle Effect
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Embodiment 1
[0023] The high-performance ultra-wide and extra-thick Q345R steel plate of this embodiment has a thickness of 120mm and a width of 3960mm, and its chemical composition is calculated by mass percentage: C: 0.16%, Si: 0.25%, Mn: 1.32%, P: 0.008%, S: 0.003%, Nb: 0.030%, Ni: 0.20%, Alt: 0.030%, H: 0.00012%, O: 0.0015%, N: 0.0035%, and the balance is Fe and unavoidable impurity elements.
[0024] The manufacturing process of the steel plate is to configure the smelting raw materials according to the chemical composition of the above-mentioned steel plate products. (1) Smelting and continuous casting: the smelting raw materials are pretreated by KR molten iron in sequence, and the converter smelting: the converter tapping P≤0.010%, and the converter tapping temperature is 1610~1650℃; LF refining: white slag retention time is not less than 25min, total refining time is not less than 45min, slag removal when molten steel S≤0.005%; RH vacuum degassing refining: vacuum degree ≤0.5mbar, ...
Embodiment 2
[0027] The high-performance ultra-wide and extra-thick Q345R steel plate of this embodiment has a thickness of 120mm and a width of 3960mm, and its chemical composition is calculated by mass percentage: C: 0.16%, Si: 0.25%, Mn: 1.32%, P: 0.008%, S: 0.003%, Nb: 0.030%, Ni: 0.20%, Alt: 0.030%, H: 0.00012%, O: 0.0015%, N: 0.0035%, and the balance is Fe and unavoidable impurity elements.
[0028] The production method of steel plate is basically the same as the production method of embodiment 1, but there are differences in the state of the test sample blank, and the specific differences are as follows:
[0029] In order to simulate the post-weld heat treatment process of the steel plate, after the sample blank is removed from the steel plate, it is first kept in a small furnace at 620°C for 4 hours, that is, the minimum post-weld heat treatment is simulated, and then the mechanical properties are tested.
[0030] Experiments prove that the steel plate of the present invention has...
Embodiment 3
[0032] The high-performance ultra-wide and extra-thick Q345R steel plate of this embodiment has a thickness of 120mm and a width of 3880mm, and its chemical composition is calculated by mass percentage: C: 0.16%, Si: 0.25%, Mn: 1.32%, P: 0.008%, S: 0.003%, Nb: 0.030%, Ni: 0.20%, Alt: 0.030%, H: 0.00012%, O: 0.0015%, N: 0.0035%, and the balance is Fe and unavoidable impurity elements.
[0033] The steel plate is that the production method is basically the same as the production method of embodiment 1, but there are differences in the state of the inspection sample blank, and the specific differences are as follows:
[0034] In order to simulate the post-weld heat treatment process of the steel plate, after the sample blank is removed from the steel plate, it is first kept in a small furnace at 620°C for 12 hours, which is the maximum simulated post-weld heat treatment, and then the mechanical properties are tested.
[0035] Experiments prove that the steel plate of the present ...
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