A kind of production method of micro-alloyed steel that can be hot-transported and hot-charged
A technology of microalloy steel and production method, which is applied in the field of microalloy steel production to achieve the effects of easy realization, increased strength, and suppressed formation
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Embodiment 1
[0016] Example 1: The chemical composition of the microalloyed steel is shown in Table 1. Pouring into 10 pieces of 260×2080mm continuous casting slabs, the surface temperature during straightening is 900~910°C, after cutting, deburring, spraying, lifting off the assembly line without stacking, after a period of natural cooling, and then Hot delivery and hot loading. The surface temperatures of the slabs during hot delivery and hot charging are 757°C, 723°C, 698°C, 670°C, 644°C, 611°C, 592°C, 565°C, 533°C and 506°C, and the furnace temperature in the preheating section after entering the furnace is 770~790°C. The thickness of the steel plates after rolling was all 32 mm, and no star cracks appeared on the surface of the steel plates.
Embodiment 2
[0018] Example 2: The chemical composition of the microalloyed steel is shown in Table 1. Casting into 16 pieces of 220×1880mm continuous casting slabs, the surface temperature during straightening is 860~870°C, after cutting, deburring and spraying, the rollers are used for direct hot delivery and hot charging. During hot delivery and hot charging, the surface temperature of the slab is 590~610°C, and the furnace temperature in the preheating section after entering the furnace is 750~790°C. The thickness of the steel plate after rolling is 16~48mm, and there are no star cracks on the surface of the steel plate.
Embodiment 3
[0020] Example 3: The chemical composition of the microalloyed steel is shown in Table 1. It is poured into 7 pieces of 300×2280mm continuous casting slabs, and the surface temperature is 940~950°C during straightening. After cutting, deburring, and spraying, the rollers are used for direct hot delivery and hot charging. The surface temperature of the slab is 700~740°C during hot delivery and hot charging, and the furnace temperature in the preheating section after entering the furnace is 780~800°C. The thickness of the steel plates after rolling was 25 mm, and no star cracks appeared on the surface of the steel plates.
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