Custom 455 Stainless Alloy – General Description


Ultimately, with the need for high-strength alloys with good corrosion resistance to atmospheric environments, Carpenter Research Laboratory developed Custom 455® stainless.  Correspondingly, a martensitic age-hardenable stainless steel.  The alloy is relatively soft and formable in the annealed condition. A single-step aging treatment develops exceptionally high yield strength with good ductility and toughness.

Machined in the annealed condition and welded in much the same manner as other precipitation hardenable stainless steels. Consequently, because of its low work-hardening rate, it is extensively cold-formed. Dimensional change during hardening is only about -0.001 in/in, permitting a close-tolerance finish machining in the annealed state.

Custom 455 stainless represents a significant advancement in the area of precipitation-hardening stainless steels.  Henceforth, it is considered where the simplicity of heat treatment, ease of fabrication, high strength, and corrosion resistance are required in combination.


Although, the unique combination of high strength and corrosion resistance of Custom 455 stainless, there are a few other alloys available for consideration. Carpenter 13-8 stainless is considered where good transverse toughness and ductility are necessary for large sections.

Elevated Temperature Use

Custom 455 stainless displays excellent resistance to oxidation up to approximately 1100°F (593°C).

Long-term exposure to elevated temperatures reduces toughness in precipitation hardenable stainless steels. The reduction in toughness is minimized by using higher aging temperatures. Short exposures to elevated temperatures are considered, provided the maximum temperature is at least 50°F (28°C) less than the aging temperature.

Precision Alloy Services, a specialty metals distributor and processor, is located in Bowling Green, Ohio. Precision Alloy Services’ quality management system is certified to ISO 9001:2015 and AS9100 Rev D.  We carry a large inventory of materials including nickel, cobalt, aluminum, and titanium alloys, stainless steels, and specialty alloy steels in a variety of sizes of sheet, plate, bar, and wire. The processing includes bar sawing, water-jet cutting, chamfering, and other services. Contact Us for more information.

Custom 455 Stainless Alloy | Custom 465 Stainless Alloy | Biodur 316LS Stainless, 316LVM, ASTM F138 Stainless | 17-4 alloy stainless steel, ASTM F899

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