A kind of large thickness FH40 shipbuilding steel plate and its manufacturing method
A FH40, large-thickness technology, applied in the direction of manufacturing tools, temperature control, metal rolling, etc., can solve the problems of lack of experience in polar ship design and manufacturing, achieve high shape and grain size control, refine grain size, well-designed effects
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[0034] Specific embodiments are described below in conjunction with the accompanying drawings:
[0035] It can be seen from the metallographic structure of Example 1 that the structure of the steel plate after the new TMCP process is basically ferrite + bainite structure, the original austenite of the steel plate and the structure of the finished steel plate have clear grain boundaries and very fine grains (among them, the austenite grain size is 10.0, and the ferrite grain size is 11.0), so as to achieve good low temperature aging impact toughness and high strength level of large thickness FH40 shipbuilding steel plate.
[0036] The chemical composition of the large-thickness FH40 shipbuilding steel plate with excellent aging impact toughness of the present invention is shown in Table 1, the billet smelting process parameters are shown in Table 2, the rolling method and cooling process of the steel plate are shown in Table 3, and the tensile and impact properties of the embodi...
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