Sigma phase occurs in Ferritic, martensitic, austenitic and duplex stainless steels when exposed to temperatures in the range of _____.

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Sigma phase occurs in Ferritic, martensitic, austenitic and duplex stainless steels when exposed to temperatures in the range of _____.
A . 537º C C 954º C
B . 621º C C 926º C
C . 676º C C 760º C
D . 584º C C 840º C

Answer: A

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