Effect of Sulphur on Solidification Cracking in Weld Metal of Steel (Report 4) : Theoretical and Experimental Iuvestigations on Solidification Crack Subceptibility of Low Carbon Steel Weld Metal :

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It is well known that manganese is an effective element to prevent the weld solidification crack in steel. Nevertheless not only the manganese content required for a given sulphur content but also the detailed metallurgical meaning on the effect of manganese have not been well understood so far. In this report these problems are theoretically discussed, by combining Fe-(Mn, Fe)S eulectic temperature in Fe-S-Mn phase diagram and the "changing curve in liquid composition" derived already by the authors. As the result, it is theoretically derived that a steel whose Mn^3/S is larger than 6.7 has a sufficiently low crack susceptibility. Then, this relation is experimentally confirmed for low carbon steels (C≤0.12%) using the Trans-Varestraint test.

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