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The ASTM A-890 Grade 1A is a duplex stainless steel
cast alloy with the following composition
C - 0.04 max, Cr -
24.5-26.5, Ni - 4.75-6.00 max,
Cu - 2.75-3.25, Mo - 1.75-2.25, Mn - 1.00 Max,
P - .040 max, S - 0.040 max, Si =
1.00 max
The 1A grade has
sufficient yield strength, but doesn't meet the requirements for ultimate tensile
strength or % elongation.
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