超深絞り用高強度溶融亜鉛めつき鋼板の開発(表面処理鋼板)(<特集>高強度薄鋼板)

概要

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The effects of silicon, manganese and phosphorus addition on the mechanical properties of extra low carbon titanium-stabilized steel sheets have been examined in order to develop high-strength galvannealed steel sheets with extra deep drawability. Titanium-stabilized steels containing silicon, manganese and phosphorus have excellent r-value, good strength/elongation balance and low yield ratio (yield stress/tensile strength) as in base steel without these substitutional alloying elements. In particular, the r-value of silicon and phosphorus-containing steel sheets are higher than that of base steel at a given grain size after annealing. The effects of phosphorus addition in steels on phosphate coating, galvannealing behavior after galvanizing, and the properties of galvannealing coating have been investigated. Titanium-stabilized sheet steels with phosphorus show excellent coating properties after phosphating or galvannealing. The spot weldability of galvannealed sheet steels manufactured in accordance with these experimental results are sufficient to meet the requirements of automobile manufacturers.
社団法人日本鉄鋼協会の論文
1982-07-01