the exerpt below is the specifications of a structural project where both struct

Question

the exerpt below is the specifications of a structural project where both structural and stainless steels are used. Why does the stainless steel use the wording minimum Fy while the structural and misc steel merely use Fy? Please list references!

Stainless steel

angles:  Hot rolled, annealed  ASTM A 276 Type 304L. Minimum Fy = 30 Ksi

Plat:  ASTM A276, Type 304L. Minimum Fy = 30 Ksi

Structural and Miscellaneous steel

Shapes, Plates and bars: ASTM A 36 Fy = 30 Ksi

Square & Rectangular HSS: ASTM A500, Grade B, Fy = 46 Ksi

Explanation / Answer

Stainless steel uses the wording minimum because there is no well defined yield stress value for stainless steel. The stress-strain curve post yielding is highly non-linear and stainless steel keeps on taking additional load post yielding. In case of structural steel, once the member yields, there is a plateau region, which can be taken to be yield stress and as a result there is no need for considering minimum Fy.

See the attached link: http://www.bssa.org.uk/topics.php?article=125

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