Ferrite content in stainless steel and embrittlement
Summary the important notes on this concept: SS will be 885*F (475*C) embrittlement and, or sigma-phase promotion by Ferrite content. The ferrite contained in Austenite SS is kept around 2-5% for weldability. The Embrittlement by Sigma phase is prevented by keep FN < 10 The Embrittlement by 475*C is prevented by keeping FN <14 Example: Some refinery specs required FN on SS347 <9 to prevent the Embrittlement (475*C Embrittle + Sigma phase embrittle) There are a number of different types of steels that may be referred to as ‘stainless’; previous articles have considered ferritic and precipitation hardening steels for … Continue reading Ferrite content in stainless steel and embrittlement
