A kind of production method of micro-alloyed steel that can be hot-transported and hot-charged
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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
Active Publication Date: 2020-09-04
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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[0005] Aiming at the problems of hot delivery and hot charging of existing microalloy steels, the purpose of the present invention is to provide a production method of microalloy steels capable of hot delivery and hot charging
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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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Abstract
The invention provides a hot delivery and hot charging production method of micro-alloyed steel. The micro-alloyed steel comprises the component of Fe, and further comprises C, Si, Mn, P, S, Al, Nb, Ti, Cr, Mo, Ni, Cu, B, N, O, and unavoidable impurity elements, wherein O is less than or equal to 0.002%, Nb is less than or equal to 0.11%, Ti is 0.08%-0.020%, and Ti / N is greater than or equal to 3.4, B is 0.001%-0.004%. The hot delivery and hot charging technology comprises the following steps that (1)when a continuous casting slab is subjected to straightening, surface temperature is 850-950 DEG C, and when hot delivery and hot charging are carried out, the surface temperature is 500-850 DEG C; a casting blank is preferentially and directly sent and delivered by using a roller way, or after number spraying is carried out, the casting blank is lifted off a line, but not stacked, and then delivered onto a furnace after natural cooling; (2)and during the heating process, the temperature of a preheating section hearth is greater than the surface temperature of the casting blank when the casting blank is subjected to hot delivery and hot charging. The hot delivery and hot charging production method of the micro-alloyed steel effectively avoids the star shake of steel plate surface caused by hot delivery and hot charging at two phase regions of micro-alloyed steel continuous castingslab, so that the industrial production of the micro-alloyed steel by hot delivery and hot delivery is possible, the production cost is reduced, and the hot delivery and hot charging technology is simple.
Description
technical field [0001] The invention belongs to the technical field of microalloy steel production, and in particular relates to a production method of microalloy steel capable of hot delivery and hot charging. Background technique [0002] The hot delivery and hot charging technology can reduce the energy consumption of the billet reheating process, shorten the heating time to reduce burning loss, simplify the production process and improve the production rhythm, and reduce the billet inventory workshop area and labor input. Therefore, the hot delivery and hot charging technology can Significantly lower production costs. [0003] However, for microalloyed steels containing Ti and Nb, surface star cracks are prone to occur in the rolling process after the continuous casting slab is hot-sent and hot-charged. Studies have shown that when the surface temperature is hot-sent and hot-charged in the two-phase region, after austenitization heating, it is easy to cause pro-eutectoi...
Claims
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