E420-W300 ultrahigh-strength ship plate steel and manufacturing method therefor
A manufacturing method, ship plate steel technology, applied in the field of iron and steel production, can solve problems such as lowering the mechanical properties of welded joints, deterioration of low-temperature toughness, etc., and achieve the effects of reducing costs, stabilizing the production process, and improving toughness
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[0026] A kind of E420-W300 ultra-high-strength ship plate steel and its manufacturing method provided in the following examples, the steel plate thickness is 80mm, the chemical composition is shown in Table 1, the rolling cooling process parameters are shown in Table 2, and the product performance is shown in Table 3:
[0027] The main chemical composition (wt%) of the embodiment of table 1
[0028]
[0029] The rolling cooling process parameter of table 2 embodiment
[0030] Example Thickness mm Rough rolling finish temperature ℃ Finish rolling start temperature ℃ Return to red temperature ℃ 1 80 1071 845 560 2 80 1052 818 500 3 80 1083 867 600
[0031] Table 3 embodiment product performance
[0032]
[0033] It can be seen that the steel plate obtained by the present invention has good comprehensive mechanical properties, yield strength ≥ 420MPa, tensile strength ≥ 530MPa, and is suitable for high-strength ship plate steel wi...
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