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

1.钢结构性好，自重轻、大大提宅安全可性。

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

2.但分解质展性较大，感化到无毛边裁切和打孔操纵。