Hello Sir

Advantages & Disadvantages of steel doors are

Advantages : 

• Steel doors are extremely durable and has great strength. 
• They can also be polished.
• Resistant to rust, discoloration and corrosion. 

Disadvantages:  
 Steel doors easily corrode due to presence of iron in it.

For More info on steel doors click on the link given below:

http://www.gharexpert.com/category/1365/Steel-Doors-0.aspx?PL=2&CatID=1365&Category=Steel%20Doors&Page_Id=1

Thanks