Most of the use requirements are to maintain the original appearance of the building for a long time. When determining the type of stainless steel to be selected, the main considerations are the required aesthetic standards, the corrosivity of the local atmosphere and the cleaning system to be adopted. However, more and more other applications only seek for structural integrity or impermeability. For example, the roof and side walls of industrial buildings. In these applications, the construction cost of the owner may be more important than aesthetics, and the surface is not very clean. The effect of using 304 stainless steel in dry indoor environment is quite good.
However, in rural and urban areas, if you want to maintain its appearance outdoors, you need to wash it frequently. In heavily polluted industrial areas and coastal areas, the surface will be very dirty and even rusty. However, in order to achieve the aesthetic effect in the outdoor environment, it is necessary to use nickel-containing stainless steel. Therefore, 304 stainless steel is widely used for curtain wall, side wall, roof and other building purposes, but 316 stainless steel is used in severe corrosive industrial or marine atmosphere. Several design criteria include 304 and 316 stainless steel.