| 摘要 |
<p>A sufficient inner oxidized layer can be formed on the ferrite surface layers of steel plates, regardless of steel constituent elements and a production history and despite radiation heating such as radiant tubes used in recrystallization annealing before hot-dipping, by heat-treating, after hot-rolling, blank billets with black scales deposited thereon in a reduction-restricted atmosphere and a temperature range of 650 to 950 DEG.C, thereby it is possible to impart an excellent hot-dipping and chemical conversion treating features to plating steel plates.</p> |
