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Carbon		0.04 max
Chromium		24 - 27
Copper		1.5 - 2.5
Iron		Balance
Manganese		1.5 max
Molybdenum		2.9 - 3.9
Nickel		4.5 - 6.5
Nitrogen		0.1 - 0.25
Phosphorus		0.04 max
Silicon		1 max
Sulphur		0.03 max

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		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.

Machinability		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.

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

Welding		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		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.

Annealing		Anneal at 1900 F and rapid cool.

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

Physical Data : [top]

Density (lb / cu. in.)	0.282
Specific Gravity	7.81
Specific Heat (Btu/lb/Deg F - [32-212 Deg F])	0.113
Electrical Resistivity (microhm-cm (at 68 Deg F))	506
Melting Point (Deg F)	2550
Mean Coeff Thermal Expansion	6.6
Magnetic Permeability	3.5
Modulus of Elasticity Tension	30.5

Form		Plate
Condition		Solution Heat Treated
Temper		70
Tensile Strength		129
Yield Strength		99
Elongation		26
Rockwell		C27
Form		Plate
Condition		Solution Heat Treated
Temper		200
Tensile Strength		114
Yield Strength		88
Elongation		29
Form		Plate
Condition		Solution Heat Treated
Temper		400
Tensile Strength		110
Yield Strength		80
Elongation		30
Form		Plate
Condition		Solution Heat Treated
Temper		600
Tensile Strength		105
Yield Strength		76
Elongation		31
Form		Sheet
Condition		Solution Heat Treated
Temper		70
Tensile Strength		129
Yield Strength		99
Elongation		24
Rockwell		C26