鋳片凝固後圧延開始までの析出挙動と圧延材の材質(組織と材質)(<特集>連続鋳造-熱間圧延の直結化)

概要

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Lowering the slab reheating temperature for subsequent rolling is effective for energy saving. However, the temperature has rarely been decreased to lower than 1150℃ because of the necessity to desolve precipitates in steels with Nb, V, Al etc. To produce steels with good mechanical properties by a process of hot charging or direct rolling, the understanding of precipitation kinetics is the most important because the thermal history of the new process is quite different from that of a conventional process. Experiments were carried out on Nb-microalloyed steels and Al-killed steels for batch annealing. Small ingots were hot charged into a furnace at 1050∿1100℃ and held for various times. Mechanical properties of rolled (and annealed) steels and precipitates were closely examined. With hot charging, the possibility arises that the temperature is free from any restriction ; as long as the slab is maintained above Ar_3, precipitation of the alloying carbide or nitride will hardly occur in γ prior to deformation.
社団法人日本鉄鋼協会の論文
1988-07-01