200 series: 201 202 202Cu 204Cu etc

300series: 301,302,303,304, 304L, 309, 309s, 310, 310S, 316, 316L, 316Ti, 317L, 321,347,etc

 400 series: 409,409L,410,420,430,431,439,440,441,444,etc 

Others: 2205,2507,2906,330,660,630,631,17-4ph,17-7ph, S318039 904L,etc

1. Fence, greenhouse, door pipe,greenhouse 

 2. Low pressure liquid, water, gas, oil, line pipe 

3. For both indoor and outdoor the building construction 

4. Widely used in scaffolding construction which is much cheaper and convenient