高温鋼材水冷時の冷却能力に及ぼす水温の影響

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In water cooling of hot steels, a cooling capacity (H) is influenced by water temperature (θ_w). The authors analyzed the effect of water temperature on the cooling capacity by using the data of authors' and other reseachers' experiments. The coefficient of water temperature Rb[℃^<-1>], which is the contribution factor of water temperature to the cooling capacity, is defined as Rb=[H(θ_b+Δθ)-H(θ_b-Δθ)]/[H(θ_b)×2・Δθ], where θ_b and Δθ are basic temperature and temperature difference from θ_b, respectively. By introducing the idea of Rb, the effect of θ_w on H in many experiments has been analysed systematically. The mian results obtained are as follows : 1) The values of R_<θ_b, 5> (θ_b : 30, Δθ : 5), which correspond to the typical temperature of cooling water in production mills, exist within the range of -0.01 to -0.02℃^<-1>. This result means that the values of H change ∓(1 to 2)% with ±1℃ variation of θ_w. 2) The absolute R_<θ_b, 5>-value of laminar coolings is larger than that of spray coolings. 3) It seems that the values of Rb are influenced by sizes and surface conditions of a steel to be cooled, flow conditions of cooling water on a cooled surface, and so on.
社団法人日本鉄鋼協会の論文
1989-07-01