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Carbon steel containing MnS inclusions was rapidly heated and cooled. The effect of this treatment on the localized corrosion susceptibility of those inclusions in 3% NaCl solution was studied. Specimens of which central zones were heated to 1,100-1,45C in air and cooled rapidly were used for this study. Measurements showed that the corrosion potential of the heated zone was lower than that of the non-heated zone. In addition, anodic polarization of the heated zone was smaller than that of the non-heated zone. Localized corrosion was easily caused around MnS inclusions in the heated zone by dipping in 3% NaCl at 40C, and the heated zone was selectively corroded by testing in artificial sea water for 2 months. The measurement of Mn and S content with EPMA across the MnS inclusion revealed that the matrix surrounding the MnS inclusion in the heated zone was enriched in sulfur. It is thought that this partial enrichment in sulfur is due to the rapid cooling to form the unprecipitated phase of the MnS inclusion melted by electric resistance welding. On the initiation of localized corrosion, this sulfur-enriched part acts as a micro anode for MnS inclusions and the residual matrix as a micro cathode. The effect of normalizing ERW steel pipe at 700-1,100C on grooving corrosion resistance of the weld was also studied. Localized corrosion around MnS inclusions in the specimen normalized at 900 and 1,100C for 30min did not occur after immersion in 3% NaCl solution at 50C. No grooving corrosion occured in those specimens tested in artificial sea water at 40C for 4 months. Electron microprobe examinations revealed that the sulfur-enriched part around MnS inclusion disappeared in normalizing.

Effect of Heat Treatment of Steel Containing MnS Inclusions on Localized Corrosion Susceptibility of Those Inclusions