TCFE14 Composition Limits

The TCS Steel and Fe-alloys Database (TCFE) is applicable for various types of steels/Fe-alloys with an Fe-minimum of 50 wt.%.

The critical calculations must always be verified by equilibrium experimental data; it is the user's responsibility to verify the calculations.

A sensible calculation cannot be expected if all alloying elements are at their highest limits. Some combinations of elements at high values do not give reasonable results. However, some alloying elements can exceed their limits considerably and the calculations still give good results.

If you discover any significant deviations and want to help us improve future versions of the database, please contact Thermo‑Calc Software at one of our offices or send us an email at info@thermocalc.com.

For alloying elements, the recommended composition limits are given in the table below.

Ar is only considered in the gas phase and no modeling of solubility in the solid solution phases or liquid is taken into account.

Element	Max	Element	Max
Al	10	Ni	20
B	Trace	O	Trace
C	7	P	Trace
Ca	Trace	Ru	15
Ce	Trace	S	Trace
Co	20	Si	5
Cr	30	Sn	5
Cu	5	Ta	10
H	Trace	Ti	3
Mg	Trace	V	15
Mn	30	W	15
Mo	10	Y	*
N	5	Zn	**
Nb	5	Zr	10
* Y systems are included mainly for the purpose of oxide dispersion strengthened (ODS) steels with many assessed oxygen containing binary and ternary systems within the Al-Cr-Cu-Fe-Mn-Ni-O-Si-Y-Zr frame of elements. ** The element Zn has been further treated with the focus on the Zn corner of Al-Cr-Fe-Zn system for galvanization process, but several other binaries and ternaries are also included.