Vl4-4l marine steel plate with good low temperature toughness and its manufacturing method
A low-temperature toughness technology for ships, applied to VL4-4L steel plates for ships with good low-temperature toughness and its manufacturing field, can solve problems such as difficult production, achieve low cost, reasonable design, and reduce energy consumption
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[0037] Specific embodiments are described below in conjunction with the accompanying drawings:
[0038] It can be seen from the metallographic structure of Example 1 that the VL4-4L marine steel plate with good low temperature toughness is basically ferrite + bainite structure after the TMCP process, and the original austenite and the finished steel plate are all It has clear grain boundaries and very small grains (among which the austenite grain size is 9.0 and the ferrite grain size is 11.0), which greatly improves the low temperature impact toughness of the VL4-4L marine steel plate with good low temperature toughness and high strength level.
[0039] The chemical composition of the VL4-4L marine steel plate with good low temperature 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 em...
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