Schoefer Ferrite Factor Calculation
The ferrite factor calculation according to Schoefer estimates the delta ferrite content in austenitic stainless steels. It helps optimize the structure and mechanical properties.
Physicochemical mechanism of action
The ferrite factor calculation according to Schoefer is based on the relationship between the temperatures during melting and cooling of a steel. It indicates how much delta ferrite (a form of ferrite) forms in the austenitic phase.
Metallurgical relevance & welding risks
A too high delta ferrite content can impair toughness and elasticity of the steel. This leads to increased susceptibility to cracking and reduced mechanical strength. The calculation helps minimize these risks.
Workshop practice & actionable instructions
To calculate the ferrite factor according to Schoefer, you need the melting temperature (Tm) and the cooling temperature (Ta). The formula is: Ferrite factor = (Tm - Ta) / Tm. For stainless steels, an optimal ferrite factor is typically between 0.25 and 0.35. Values above this can impair toughness.