Specifying Structural Stainless Steel

[rabroke]

I am specifying and designing stainless steel in an ornamental stair. Per the architectural requirements, the stringers are to be stainless steel tube members, currently detailed at 12 inches deep and 4 inches wide (subject to change per my design). I've seen that ASTM A 276 appears to be the standard specification for stainless steel bars and shapes, however it's not clear to me whether tubes fall under this category or not (there is an ASTM A 554 for Welded Stainless Steel Mechanical Tubing).
I'm also trying to determine what the appropriate yield strength would be for design. I'm under the impression that type 304 is the most common, which has a yield strength of 30 ksi.
I feel like I'm all over the place with the information I've gathered, and would like clarification anyone may be able to give. Thanks

 

[EdStainless]

A554 may be the best option for you. The tensile strengths are listed in a supplemental requirement.
If this is being used indoors then 304 would be typical. If you are outdoors then we need to talk about possible corrosion.

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Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube

http://www.plymouth.com

 

[TVP]

I agree with EdStainless, ASTM A 554 is the specification you need to review. Type 304 is the most common grade, and in the cold drawn condition can have a strength significantly higher than 30 ksi. Plymouth Tube is a highly regarded company, and I suggest you email Ed to discuss your requirements in greater detail.