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  • New HIPed Powder Metallurgy Super Duplex Stainless Steel Suction Roll Shells with Excellent Corrosion and fatigue Properties for Paper Machine Applications


Corrosion fatigue in paper and board machine environments is one of the main concerns in selection of suction roll shell materials. Corrosion fatigue damage is a result of complex interaction between dynamic loading due to operation, thennal and residual stresses and corrosive environment. Corrosion fatigue strength of the shell material is the major design parameter for suction roll shells operating in press suction roll position. In the future, the corrosion environment in paper and board machines becomes even more severe due to reduced use of fresh water. This factor, together with increasing machine speed, increases the importance of local corrosion and corrosion fatigue properties of the shell materials.

Manufacturing by HIPing of powder metallurgy (P/M) suction roll shells improves drastically the corrosion fatigue properties due to homogeneity of the microstructure, extremely fine grain size and possibility to produce heavy high-alloyed super duplex stainless steel components. Additionally, large inclusions and pores, which are typical corrosion fatigue crack initiation sites in cast or wrought materials, can be eliminated which improves the reliability of the components. Large suction roll shells are produced by NG- TIG welding of HIPed ingots. New welding method was developed to obtain equal corrosion and fatigue properties between the weld and base metals without porosity or inclusions. Largest components produced so far have gross weight of 38 metric tons with diameter of 1310 mm and length of 9200 mm.

This paper describes material properties, manufacturing characteristics and field experience of new HIPed P/M super duplex stainless steel suction roll shells. Especially, corrosion and fatigue properties are evaluated and compared with present welded and cast materials. ls.

Additional information

Authors: KORHONEN M, Helsinki University of Technology, Espoo (FI);HNNINEN H, Helsinki University of Technology, Espoo (FI);HMLINEN E, Helsinki University of Technology, Espoo (FI);LAITINEN A, Metso Powdermet Oy, Tampere (FI);LIIMATAINEN J, Metso Powdermet Oy, Tampere (FI);HEIKKINEN J, Metso Paper Oy, Jyvõskylõ (FI)
Bibliographic Reference: An oral report given at: the 10th International Symposium on Corrosion in the Pulp and Paper Industry. Held in: Helsinki Finland, 21-24 August 2001
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