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post #2 of Old 10-24-2011
RichH
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... a common problem with 300 series stainless which has been widelly known since the mid 1970s = embrittlement or fatigue failure.
Although 300 series stainless has an ultimate tensile value of 90,000psi, it will quickly fail by fatigue failure at any repetitive loading (1 million cycles) above 30,000 psi ... known as the fatigue endurance limit.
The reason for all this that many who apply 300 series stainless steel do so via 'cookbook' values, not from a 'knowledge basis'. ... and thats why there are structural codes for 'critical stuff'.
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