Stainless steels
Austenitic and duplex stainless steels are widely used by Metso in the manufacturing of monolithic and compound powder metallurgical (P/M) components.
The main benefits of using the P/M manufacturing route for stainless steels instead of forging or casting are related to the improved material properties as well as the near net shape manufacturing. Increased alloying element contents can be utilized in P/M stainless steels without the typical problems encountered in forging and casting. Furthermore, tailor-made alloys are easier to manufacture since the needed melt size is considerably smaller in the P/M method than in the traditional methods.
P/M austenitic stainless steels typically used are 18Cr-8Ni chromium nickel steels. Standard grades are available as well as special grades, which were used for example in the manufacturing of the end covers for CERN's Large Hadron Collider. Corrosion resistance can be further increased by selecting super austenitic grades such as Ralloy 654MO (24Cr-22Ni-7Mo). P/M manufacturing makes it possible to cost-effectively improve further mechanical properties and corrosion resistance by using nitrogen alloying.
P/M duplex stainless steels are widely used, especially in the petrochemical and offshore industries. Low-alloy duplex stainless steels of the type 22Cr-5Ni (Duplok 22) as well as high-alloy or super duplex stainless steels of the type 25Cr-7Ni (Duplok 27) are available. A homogeneous, fine microstructure guarantees optimum heat treatability with a minimized amount of harmful inter-metallic phases.
Material datasheet: Duplok 27
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