大型扁平鋼塊のザクきずの圧着におよぼす圧延プロセスの影響(<特集>圧延歩留り向上の技術と理論)

概要

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The effect of rolling condition on the annihilation process of loose structure in large slab ingot was investigated to clarify the possibility of getting sound heavy steel plate by rolling. The most important parameters for annihilating the loose structure were found to be reduction ratio, rolling shape factor, and deformation resistance ratio. The following formulae were derived to predict the rolling conditions required for annihilating loose structure. α=Σ^^n__<i=1>ψi(⊿h/Ho)i≧1, ψ=(⊿b/bo)/(⊿h/Ho)=3[1-(0.14)/(1d/hm)・exp{-4・(1d/hm)^<0.77>・Pav/koc}] where α : Critical closing hole index ψ : Rate of closing hole ⊿h : Reduction 1d/hm : Rolling shape factor Ho : Initial thickness koc : Deformation resistance at the center of thickness Pav : Average of hydrostatic stress ⊿b : Reduction of hole diameter bo : Initial hole diameter
社団法人日本鉄鋼協会の論文
1981-11-01