Custom 455 (Carpenter Custom 455, UNS S45500) Forgings — Titanium-Hardened PH Stainless for Higher Strength Than Custom 450
Shivam Forge manufactures forgings in Custom 455 (Carpenter Custom 455, UNS S45500) — a precipitation-hardening martensitic stainless steel developed as a higher-strength evolution of Custom 450, using titanium-assisted aging rather than copper alone to reach ultimate tensile strengths meaningfully beyond what Custom 450 achieves. Aerospace fasteners, landing gear components, and high-strength structural forgings. Rajkot, India. Call +91-9265772827.
Custom 455 was developed by Carpenter Technology as a direct successor within the same precipitation-hardening martensitic stainless family as Custom 450, aimed specifically at closing a strength gap Custom 450 left open. Both alloys share the same fundamental chromium-nickel-copper martensitic base and the same low-carbon composition that supports weldability in the solution-annealed condition, but they diverge in how their precipitation-hardening reaction is engineered: Custom 450 relies primarily on a copper-based precipitate (supplemented by columbium) to develop strength during aging, while Custom 455 adds titanium to the alloying, which forms a more potent nickel-titanium intermetallic precipitate during aging and drives ultimate tensile strength meaningfully higher — commonly into the 220-235 ksi range in the H950 condition, well above Custom 450's roughly 170-190 ksi ceiling in its H900 condition. This isn't a free upgrade, however: Custom 455's higher achievable strength trades against somewhat reduced ductility and impact toughness at its maximum-strength aging conditions compared to Custom 450 at comparable aging temperatures, and its titanium addition requires tighter melt and aging process control to develop consistent properties, since titanium-based precipitation reactions are more sensitive to aging temperature and time than the copper-based reaction Custom 450 relies on. The practical selection logic follows directly from this: Custom 455 is specified where a component's design genuinely needs strength beyond Custom 450's ceiling — high-load aerospace fasteners and landing gear hardware being the archetypal case — while Custom 450 remains the better choice wherever its lower peak strength is sufficient and its somewhat more forgiving toughness margin and process sensitivity are preferred.
Forged Custom 455 fastener and structural fitting blanks for aerospace applications requiring strength levels beyond Custom 450's ceiling, where the titanium-hardened precipitation reaction's higher achievable tensile strength directly reduces required section size and weight.
Custom 455 forgings for landing gear hardware and other high-load structural components where maximum strength-to-weight ratio, combined with corrosion resistance superior to non-stainless high-strength alloy steels, is the governing design driver.
Forged Custom 455 shafting and hardware for marine and industrial applications requiring strength beyond what Custom 450 or 17-4PH deliver, in corrosion-exposed service where a non-stainless ultra-high-strength steel isn't acceptable.
Forgings supplied to the specific Custom 455 aging condition your application requires, balancing the alloy's high achievable strength against the ductility and toughness margin the design actually needs.
Complete solution treatment and controlled aging cycle developing Custom 455's nickel-titanium intermetallic precipitation strengthening, with tighter process control than copper-based Custom 450 aging requires given the titanium reaction's greater sensitivity to time and temperature.
Component supply in the solution-annealed condition to support customer welding and fabrication operations prior to final aging, leveraging the alloy's low-carbon composition to limit heat-affected-zone cracking risk, as with Custom 450.
Tensile, hardness, and impact testing verifying mechanical properties for the specified aging condition, with particular attention to the ductility and toughness tradeoff at Custom 455's higher-strength aging conditions.
Material test certificates per EN 10204 3.1 as standard, with 3.2 third-party witnessed certification available for aerospace application documentation requirements.
Custom 455 (Carpenter Custom 455, UNS S45500) sits directly above Custom 450 in the same precipitation-hardening martensitic stainless family, and understanding the relationship between the two grades is essential to specifying either one correctly. Both share a chromium-nickel-copper martensitic base and a low-carbon composition that supports weldability in the solution-annealed condition, but Custom 455 was developed specifically to push achievable strength beyond what Custom 450's copper-based precipitation-hardening mechanism can reach, by adding titanium to the alloying chemistry — a compositional change with a specific, real metallurgical purpose rather than a marketing refinement.
The mechanism behind this strength increase is the aging reaction itself: Custom 450 develops strength primarily through a copper-rich precipitate (with columbium additions supporting the reaction), while Custom 455's titanium addition forms a nickel-titanium intermetallic precipitate during aging that is a considerably more potent strengthening mechanism. The practical result is that Custom 455, aged to its H950 condition, commonly reaches ultimate tensile strengths in the 220-235 ksi range, meaningfully above Custom 450's roughly 170-190 ksi ceiling in its H900 condition — a genuine strength advantage of real engineering consequence for weight-constrained, high-load applications. This higher strength does come with a tradeoff: Custom 455 at its higher-strength aging conditions generally exhibits somewhat reduced ductility and impact toughness compared to Custom 450 at comparable relative aging conditions, and the titanium-based precipitation reaction is more sensitive to aging temperature and time control, requiring tighter process discipline to develop consistent, repeatable mechanical properties.
This strength-versus-toughness-and-process-sensitivity tradeoff is exactly what should drive the choice between the two grades rather than defaulting to whichever alloy sounds more advanced. Aerospace fasteners, landing gear hardware, and other high-load structural components where the design genuinely needs strength beyond Custom 450's ceiling are the applications where Custom 455's premium is worth paying; components where Custom 450's lower peak strength is already sufficient are generally better served by its somewhat more forgiving toughness margin and lower sensitivity to aging process variation. Both alloys retain the family's characteristic weldability advantage in the solution-annealed condition, distinguishing both from higher-carbon precipitation-hardening grades like standard 17-4PH.
For aerospace and high-load structural component manufacturers requiring forged Custom 455 with strength beyond Custom 450's range, Shivam Forge manufactures Custom 455 forgings across standard aging conditions with full mechanical property verification. Contact our engineering team at +91-9265772827 or sales@shivamforge.com with your component drawing and required strength condition to discuss manufacturability and quotation.
Custom 455 was developed as a higher-strength evolution of Custom 450 within the same chromium-nickel-copper martensitic precipitation-hardening family. The key difference is a titanium addition to Custom 455's alloying that forms a more potent nickel-titanium intermetallic precipitate during aging, driving ultimate tensile strength up to roughly 220-235 ksi in the H950 condition versus Custom 450's roughly 170-190 ksi ceiling in H900 — at some cost to ductility and toughness margin at those higher-strength conditions.
Custom 455 is specified specifically where a component's design load genuinely requires strength beyond Custom 450's ceiling — high-load aerospace fasteners and landing gear hardware are the archetypal cases. Where Custom 450's lower peak strength is sufficient, Custom 450 is typically preferred instead, since it offers a somewhat more forgiving toughness margin and less aging-process sensitivity.
Yes — Custom 455 shares Custom 450's low-carbon composition, which limits heat-affected-zone hardening and cracking risk during welding, and it can similarly be welded in the solution-annealed condition prior to final aging. The completed weldment is then aged to develop final strength, as with Custom 450.
Custom 455 is available across a range of aging conditions analogous to the H900-through-H1150 system used for other precipitation-hardening stainless grades, with H950 commonly cited as delivering the alloy's characteristic high-strength combination. We advise on condition selection based on your component's required strength-versus-toughness balance.
EN 10204 3.1 material test certificates as standard, with 3.2 third-party witnessed certification available, documenting chemistry and mechanical properties for the specific aging condition your application requires, including tensile, hardness, and impact test results.
Why Choose Shivam Forge
Shivam Forge delivers precision hot-forged components from our integrated Shapar, Rajkot facility — covering forging, CNC machining, heat treatment, and quality inspection under one roof.
