Sulphurous Systems
The formation of sulfides in steels can be detrimental or beneficial. In either case it is important to understand and control the formation of sulfides. The TCS Steel and Fe-alloys Database (TCFE) includes the thermodynamics of Ca-Fe-Mn-Mg-S and its lower order systems. The Cr solubility in MnS is estimated based on the experimental data. Cu-sulfides are also added for some applications such as electrical steels.
FeS-MnS-MgS
Figure 1: The solubility lines in the FeS-MnS-MgS system in the temperature interval 873-1273 K.
CaS-MgS-MnS
![The CaS-MgS-MnS isothermal sections plotted at 1073-1273 K together with experimental information as cited in [2016, Dilner]](../../../resources/images/tcfe/sulfur_fesmgsmns-iso.png "The CaS-MgS-MnS isothermal sections plotted at 1073-1273 K together with experimental information as cited in [2016, Dilner]")
Figure 2: The CaS-MgS-MnS isothermal sections plotted at 1073-1273 K together with experimental information as cited in [2016Dil].
Reference
[2016Dil] D. Dilner, Thermodynamic description of the Fe–Mn–Ca–Mg–S system, Calphad. 53, 55–61 (2016).