High-toughness and high-weather-resistance steel and manufacturing method thereof
A manufacturing method and high weather resistance technology, which is applied in the field of high weather resistance steel and its manufacture, and high toughness, can solve the problems of low temperature toughness in the heat-affected zone, lower yield strength, and lower strength of controlled-rolled steel plates, etc.
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[0054] The present invention will be further described below in conjunction with embodiments and drawings.
[0055] Table 1 shows the composition of the steel in the embodiment of the invention, and Table 2 shows the manufacturing process of the steel in the embodiment of the invention. Table 3 shows the properties of the steel in the example of the invention.
[0056] The process of the embodiment of the present invention is: TDS molten iron deep desulfurization → converter smelting → LF → RH (feeding Si-Ca wire) → continuous casting (using light reduction process) → slab off-line finishing → slab cut-to-length fire cutting → Heating→TMCP→Steel slow cooling→AUT / MUT→Steel edge trimming, cutting head and tail→Sampling and performance test→Cutting steel plate to length→Surface quality and appearance size, marking and testing→Delivery.
[0057] See figure 1 , Which shows the microstructure of the steel plate of Example 5 of the present invention, which is uniform and fine and include...
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