Slow-cooling cover for slab and cooling method
A cooling method and casting technology, which can be used in furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as the decline of hot workability, and achieve the effect of suppressing cracks.
Active Publication Date: 2021-10-19
JFE STEEL CORP
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Problems solved by technology
[0003]However, hot charging rolled cast slabs are rolled due to insufficient phase transformation from austenite (γ) to ferrite (α) , Therefore, there are cases where the hot workability decreases due to grain boundary embrittlement caused by precipitates at the γ grain boundary
Method used
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Embodiment
[0071] Examples performed by the inventors of the present application will be described. In the examples, first, the cooling rate of the slow cooling of the slab B performed using the first slow cooling device 14 and the second slow cooling device 16 in the above-mentioned embodiment, and the cooling rate of the air cooling of the slab B were investigated. . In this investigation, the surface temperature of the slab B was continuously measured for cooling under the above three conditions. The size of the slabs B is 400 mm×310 mm×5500 mm, and the slow cooling cover 3 can house the slabs B in a state arranged in the same manner as in the above-mentioned embodiment.
[0072] Figure 6 The investigation results of the cooling rate are shown. Such as Figure 6 As shown, in the cooling of the second slow cooling device 16 using the slow cooling cover 3, the cooling rate is -0.54~-0.33°C / min, which is sufficiently lower than the cooling rate of the air cooling of -0.26~-0.22°C / mi...
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The present invention provides a slow-cooling cover for a slab and a cooling method which are capable of cooling a slab while suppressing the occurrence of cracking in the slab for which it is difficult to maintain a high temperature and cracks may occur due to forced cooling, when conveying the slab from a continuous casting facility to a heating furnace. The slow-cooling cover can accommodate slabs which are continuously cast in a continuous casting machine, in the same number as the number of strands of the continuous casting machine, and is provided with: side wall parts (31) that that can cover the entirety of the side surfaces of the slabs (B) in the same number as the number of strands disposed on a bottom surface; and a top plate part (32) that can cover the upper surfaces of the slabs (B) in the same number as the number of strands disposed on the bottom surface, wherein a thermal insulating member is provided to the inner wall surfaces of the side wall parts (31) and the top plate part (32).
Description
technical field [0001] The invention relates to a slow-cooling cover of cast slabs and a cooling method. Background technique [0002] In the manufacturing process of reheating a steel ingot cast by a continuous casting machine using a heating furnace, disintegrating and rolling, and producing a slab, the high-temperature slab after casting in the continuous casting machine is directly charged. Hot charge rolling in which heated cast slabs are rolled in a heating furnace. In hot charge rolling, since the temperature of the slab loaded into the heating furnace can be increased, the fuel used in the heating furnace can be reduced. [0003] However, since hot-fit rolled slabs are rolled without sufficient phase transformation from austenite (γ) to ferrite (α), there are grain defects caused by precipitates at γ grain boundaries. Boundary embrittlement reduces hot workability. In such a case, surface defects (grain boundary cracks) are generated during rolling. [0004] In o...
Claims
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IPC IPC(8): C21D9/00B22D11/124B21B1/00
CPCB22D11/124C21D9/00B21B1/00
Inventor 大场义阳丸田庆一森口信平清水健明
Owner JFE STEEL CORP