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AM 355 is a chromium-nickel-molybdenum stainless steel which can be hardened by martensitic transformation and/or precipitation hardening. Depending upon the heat treatment, AM 355 may have an austenitic structure and formability similar to other austenitic stainless steels or a martensitic structure and high strength comparable to other martensitic stainless steels. High strengths may also be attained by cold working.

Corrosion resistance of the alloy is superior to that of other quenched-hardenable martensitic stainless steels and approaches the capabilities of chromium-nickel austenitic stainless steels. AM 355 is normally supplied in either the annealed or equalized and over-tempered condition. It has been used for gas turbine compressor components, blades, discs, rotors and shafts and similar parts where high strength is required at intermediate elevated temperatures.

Chemical Properties

Element min max
Carbon .1 .15
Manganese .5 1.25
Silicon .5
Phosphorus .04
Sulfur .03
Chromium 15 16
Nickel 4 5
Molybdenum 2.5 3.25
Nitrogen .07 .13

Applicable Specifications:

AMS 5743 – Steel, Corrosion and Heat Resistant, Bars and Forgings

AMS 5744 – Steel, Corrosion and Heat Resistant, Bars and Forgings