Solidification Crack Susceptibility in Weld Metals of Fully Austenitic Stainless Steels (Report V) : Solidification Crack Susceptibility and Amount of Phosphide and Sulphide in SUS 310S Weld Metals

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It has been widely known that P and S have a detrimental effect on the cracking susceptibility of austenitic stainless steel weld metals. It would be of an economical and technical importance to determine the contents to which P and S can be allowed in weld metals. Previously reported investigation of weld metal crack susceptibility suggested that the P and S content should be each restricted to 0.01% or, if possible, 0.005% in order to minimize or prevent cracking in SUS (AISI) 310S fully austenitic stainless steels. Moreover, it has been revealed that phosphides and/or sulphides indicative of segregation of P and S resulting from solidification were detrimental to the cracking resistance in weld metals and reheated regions.In the present work, therefore, metallographic investigation of formation tendency of phosphides and sulphides in the case of low P and S contents was performed by means of energy dispersive x-ray analyses of inclusions and microconstituents to obtain a better understanding of metallurgical effects of the P and S content on the cracking susceptibility of SUS 310S and, for reference, SUS 304 weld metals. The result indicated that no phosphides were observed in the case of about 0.006%P or less while a negligibly small number of sulphides were observed in the case of 0.003-0.005%S for GTA melt run weld metal of SUS 310S. Consequently, it was significantly confirmed that, in order to achieve the extremely improved cracking resistance of SUS 310S, it is indispensable to reduce P content first of all down to about 0.006% and thereafter it is preferable to reduce S content below about 0.005%. On the other hand, it was positively understood that one of the main reasons for the excellent crack resistance of SUS 304 is due to the solidification process characteristic of primary solidification of a large amount of delta ferrite, eutectic/peritectic reaction and δ→γ transformation behavior.
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Solidification Crack Susceptibility in Weld Metals of Fully Austenitic Stainless Steels (Report V) : Solidification Crack Susceptibility and Amount of Phosphide and Sulphide in SUS 310S Weld Metals

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