低炭素 Nb 添加冷延鋼板の深絞り性におよぼす Nb 炭窒化物の影響

概要

論文の詳細を見る
This report deals with the effect of Nb carbonitride precipitation on deep drawability of cold rolledannealed sheets. The maximum Lankford value was obtained when Nb/C was 8∿12 for the vacuum melted steel sheet. The solution and precipitation of Nb carbonitride were examined by chemical analysis ; it was found that the carbonitride dissolved in austenite at 1200∿1300℃ in only a few minutes in the case of extrmely low-C Nb-steel (C 0.006%, Nb 0.18%), but some part of it remained in the case of low-C Nb-steel (C 0.03%, Nb 0.32%). Lankford values after cold rolling and annealing were examined for the both types of specimens. The extremely low-C Nb-steels were not affected by hot rolling conditions but low-C Nb-steel shewed a lower Lankford value when soaking and fiinishing temperatures were high. This was attributed to the precipitation of fine carbonitride.
社団法人日本鉄鋼協会の論文
1975-02-01