Cracking and Inspection of Stainless Steel Suction Rolls, 2001 Engineering / Finishing & Converting Conference Proceedings

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Existing laboratory data on the initiation and growth of corrosion fatigue cracks in stainless steel suction roll alloys is summarized and compared with observations from case histories of cracking in centrifugally cast martensitic and duplex stainless steel suction press rolls.

Crack initiation in the martensitic stainless steel roll occurred at corrosion pits inside the drilled holes. In the duplex stainless steel rolls, crack initiation occurred at foundry weld repairs. The crack growth rates were very similar to those predicted by a simple fatigue model. More data from cracked rolls is, however, needed before calculations based on laboratory studies can be used to reliably predict crack growth rates.

Baseline inspections of new rolls for imperfections near the critical size for crack initiation are required, as are carefully documented in service inspections to detect the onset of crack growth and trend crack growth rates.