Thick steel plate with high strength and toughness as well as uniform performance in thickness direction and production method of thick steel plate
A thickness direction, high strength and toughness technology, applied in the field of high strength toughness thick steel plate and its production, can solve the problem of uneven mechanical properties
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[0039] The present invention is described in detail below:
[0040] Table 1 is the value list of each embodiment of the present invention and comparative examples;
[0041] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;
[0042] Table 3 is a list of the performance tests of the various embodiments of the present invention and comparative examples.
[0043] Each embodiment of the present invention is produced according to the following steps:
[0044] 1) Carry out converter smelting, control the temperature of incoming molten iron at 1260-1300°C, the composition of molten iron P≤0.15%, S≤0.002%; control the number of blowing times in the middle of converter smelting to no more than 2 times, and control the end point composition of molten steel: C: 0.05~ 0.07%, P≤0.010%;
[0045] 2) Carry out LF refining, control the temperature of molten steel arriving at the station to not be lower than 1550°C, the refining ti...
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