Low-cost ultra-low temperature nickel steel and its manufacturing method
A manufacturing method and ultra-low temperature technology, applied in the field of low carbon and low alloy steel, can solve the problems of high production cost, low low temperature toughness, deterioration of impact toughness of steel plate, etc.
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[0061] The present invention will be further described below with reference to the embodiments and accompanying drawings.
[0062] Table 1 is the composition of the steel of the embodiment of the present invention, Table 2 and Table 3 are the manufacturing process of the steel of the embodiment of the present invention, and Table 4 and Table 5 are the properties of the steel of the embodiment of the present invention.
[0063] The manufacturing process of the embodiment of the present invention is as follows:
[0064] TDS molten iron deep desulfurization → converter smelting → LF → RH (feeding Si-Ca wire) → continuous casting (using light reduction process) → slab finishing off-line → slab cut-to-length fire cutting → heating → recrystallization controlled rolling (RCR)→Steel stack slow cooling / pit slow cooling→AUT / MUT→Steel trimming, cutting head and tail→Coarse shot blasting to remove scale on the surface of the steel plate→Austenite single-phase zone quenching+Austenite and...
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