Ferralium 255

Principal Design Features

This alloy, commonly known as Ferralium Alloy 255, is essentially an enriched stainless steel of chromium-iron-nickel. It has good chemical corrosion resistance as well as being erosion resistant.


Applications include chemical process equipment in which chlorides or phosphoric acid are encountered. The good erosion resistance of the alloy also make it suitable for pumps and valves handling hot slurries that may be abrasive as well as corrosive.


Although substantially harder than most other stainless steels, Alloy 255 can be successfully machined using most common methods. Slow speeds and heavy, constant feeds are required to overcome this alloys’ tendency to work harden.


Alloy 255 can be successfully formed using all common methods of hot or cold working.


Alloy 255 can be successfully welded using most common methods, including GTAW, GMAW and SMAW procedures. When filler metal is required, for joining with a dissimilar of higher alloy content, select the filler corresponding to the higher alloy material for best results.

Heat Treatment

The alloy responds to annealing, but is not age-hardenable.


Forging may be done in the range of 2220 F to 1700 F. A re-anneal must be done following forging in order to regain optimum corrosion resistance.

Hot Working

See “Forging”.

Cold Working

This is a ductile alloy, similar to the stainless steels but stiffer, and it is readily cold worked by conventional means. An anneal must be done following cold work to restore corrosion resistance.


Anneal at 1900 F and rapid cool.


Hardens by cold work only, but should be used in annealed condition for corrosion resistance.

Density: 0.282

Specific Gravity: 7.81

Specific Heat: 0.113

Electrical Resistivity: 506

Melting Point: 2550

MCTE: 6.6

Magnetic Permeability: 3.5

MoETensile: 30.5

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