Chromium Stainless Steels in 750°F to 900°F Service

Straight chromium stainless steels, such as the ferritic (Types 405 and 430) and martensitic types (Type 410), containing 13% or more chromium can embrittle during exposure to temperatures in the 750°F to 900°F range. This phenomenon is known as 885°F embrittlement. Some of the straight chromium stainless steels are so sensitive to 885°F embrittlement that even slow cooling through this temperature range will cause embrittlement. The 885°F embrittlement results in an upward shift in the ductile-tobrittle transition temperature. Duplex stainless steels are also susceptible to 885°F embrittlement. Prevent this problem by not using chromium stainless steels for solid wall construction of pressure vessels.

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