Marine ultrahigh-strength low-temperature steel with excellent fatigue performance and manufacturing method
A technology of fatigue performance and low-temperature steel, which is applied in the field of metal materials, and can solve the problems of low fatigue performance of steel plates, failure to meet service requirements, insufficient low-temperature toughness of steel plates, etc.
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[0039] The present invention will be further illustrated by the following examples.
[0040] The embodiment of the present invention performs smelting, continuous casting, heating, rolling, and cooling according to the component distribution ratio of the technical solution;
[0041] (1) Continuous casting: tundish superheat 15℃-25℃;
[0042] (2) Heating: heating the slab to 1200°C-1300°C, the heating rate is 5-20°C / min, and the holding time is 60-180min;
[0043] (3) Rolling: The casting billet is rolled into a hot-rolled steel sheet in three stages. In order to fully break the austenite grains, which is beneficial to the subsequent grain refinement, the first stage adopts the process of high temperature and large reduction, and the rolling The temperature is 1130-1200℃, the first pass reduction is ≥40mm, the rest pass reduction rate is 20%-40%, and the thickness is 3.3-4.0 times the thickness of the finished product to be warmed; the second stage rolling temperature is 980-1...
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