According to thermodynamic data, It cant dissolves in steel melt as gas form(SO2) because the SO2 at melt temperature of steel is very more stable than FeS compound . So sulphur cant dissolve in melt from SO2. In fact the sulphur that presents in liquid steel is remaining sulfur in the form FeS that origins from iron ore, scraps and flux that have not been removed.
"At ironmaking and steelmaking temperatures elemental sulphur is stable only as a gas, but it can be dissolved to form a liquid solution in both the slag and the metal. This means that the control of sulphur content in the metal must be considered in terms of (a) the partitioning between the gaseous compounds containing sulphur and sulphur in solution at the gas-liquid interface, and (b) the partitioning of sulphur between the slag and the metal at the slag-metal interface." = excerpt from C. Bodsworth and H.B. Bell, "Physical Chemistry of Iron & Steel Manufacture", pub. Longman, 1972.
See also chapter 10 - 'The Sulphur Problem' in "An introduction to the physical chemistry of iron and steel making", by R.G. Ward, pub. Ed. Arnold, 1962. and for some fundamental results on sulphur in liquid iron see C.W. Sherman, H.I. Elvander and J. Chipman, "The thermodynamics properties of sulfur in molten Iron-Sulfur alloys", Trans AIME, vol. 188, 1950, p 334.
Some answers given already seem to refer to the solid state.
If you are interested in the relative stability of the possible metal sulphides, you could use a thermodynamics package like MTDATA, but if you don't have access to such software, then there is an Ellingham style diagram for the stability of the different metal sulphides by F.D. Richardson and J.H.E. Jeffes in JISI, vol. 171, 1952, p167, this is reproduced in various text books one can consult, including "The Physical Chemistry of Metals", by L.S. Darken, and R.W. Gurry, pub. McGraw-Hill, 1953. This latter approach of course does not take full account of the possible element interactions unlike MTDATA, Thermoclac, FactSage etc., but is a reasonable first guide.
There's a nice paper by E.T. Turkdogan, "Theoretical aspects of sulfide formation in steel', pp 1-22 in "sulfide inclusions in steel", proc. Int. Symp. Nov. 1974, New York, pub. ASM. The rest of the proceedings has a variety of interesting papers on sulphides in steel.
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