Custom 450 Stainless Steel Bars / Custom 450 Alloy Steel Round Bars / C-450 Rods / Custom 450 Rings

Product Description

Custom 450 (also known as XM-25 or UNS S45000) is a unique martensitic precipitation-hardening stainless steel. It bridges the gap between the high strength of specialized alloys and the superior corrosion resistance of the 300-series (like 304).

Unlike many high-strength alloys that sacrifice corrosion resistance for hardness, Custom 450 remains resistant to atmospheric corrosion and many chemical environments while maintaining a yield strength significantly higher than standard stainless steels.

Technical Profile: Custom 450

Chemical Composition (%)

The alloy’s balanced chemistry allows it to be used in the solution-annealed condition or aged to higher strength levels.

Mechanical Properties (Condition H1000)

Custom 450 is typically used in the Annealed or H1000 aged condition to balance toughness and strength.

• Tensile Strength: ~1,310 MPa (190 ksi)

• Yield Strength (0.2% Offset): ~1,170 MPa (170 ksi)

• Hardness (Rockwell C): 28 – 37 HRC

• Elongation: 10% – 15%

Key Characteristics

• Corrosion Resistance: It matches the corrosion resistance of Type 304 stainless steel in most environments but offers nearly triple the yield strength. It is highly resistant to stress-corrosion cracking.

• Ease of Fabrication: Despite its strength, it can be machined, welded, and cold-formed similarly to other martensitic precipitation-hardening grades (like 17-4 PH).

• One-Step Aging: It can be hardened by a single-step, low-temperature aging process, which reduces the risk of scaling and distortion compared to multi-step heat treatments.

• Versatile Forms: Common in round bars, rods, and seamless rings (forged or rolled) due to its excellent forgeability.

Applications by Form

• Round Bars & Rods: Extensively used for high-strength shafting (especially pump and boat shafts), valve stems, and fasteners where 304 isn't strong enough and 410 isn't corrosion-resistant enough.

• Rings & Forgings: Used in aerospace components, turbine blades, and specialized industrial equipment requiring high-integrity structural rings.

• Chemical Processing: Parts for centrifuges, mixers, and pressure vessels where pitting resistance is critical.

Standard Designations