A large-thickness quenched and tempered FO460 marine steel plate and its manufacturing method
A large-thickness, ship-use technology, applied in the field of large-thickness TMCP FO460 ship-use steel plates and its manufacturing, can solve the problems of lack of experience in polar ship design and manufacturing, and achieve high shape and grain size control and uniform phase transformation structure The effect of refining and refining the grain size
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[0035] Specific embodiments are described below in conjunction with the accompanying drawings:
[0036] It can be seen from the metallographic structure of Example 1 that the structure of the steel plate after the new controlled rolling + new quenching and tempering process is basically a tempered bainite structure, the original austenite of the steel plate and the structure of the finished steel plate have clear grain boundaries, The grains are very small (the austenite grain size is 8.5), so that the low temperature impact toughness and high strength level of the large-thickness quenched and tempered FO460 marine steel plate are realized.
[0037]The chemical composition of the large-thickness quenched and tempered FO460 steel sheet for ships 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, the quenching and tempering process is shown in Ta...
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