1.Refer to the ductibility and light-weight which improved the construction more safe reliability.

1.钢结构延好，自重轻、大大提高了住宅的。

2.But geosytheic of ductibility is large, the rough edge effect to a non-cutting and drilling operations.

2.解质料的延展较大，感化到无毛边的裁切和打孔操纵。