Special Alloys N155

Principal Design Features

This iron based alloy has a long history, back to 1950, of high strength at temperatures up to 1500 F and is capable of sustaining moderate loading at temperatures of 2000 F. It has good oxidation resistance at high temperature and also possesses good corrosion resistance to sulfuric acid (at room temperature) and to nitric acid. High temperature strength derives directly from the chemical composition of the alloy and is not dependent upon age hardening.

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Applications

Industrial furnace structural parts and fixtures. High temperature bolts and gas turbine combustion chambers, exhaust manifolds, and turbine blades.

Machinability

Similar to the austenitic (300 series) stainless steels in machining characteristics the alloy can be machined by conventional means. Both carbide and high speed tool steels may be used for turning or boring. However high speed steels work best for drilling and milling operations.

Forming

Forming by cold working is preferred and the alloy has good ductility. It does work harden and may require a solution heat treatment to restore ductility during cold forming.

Welding

Multimet is readily weldable by resistance, MIG and TIG process. As is true of the high temperature alloys in general submerged-arc welding should not be used because the high heat input of that process may cause cracking in the weld area.

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