UNS S45000 Equiv: Custom 450 Specs Chart

UNS S45000 Equiv: Custom 450 Specs Chart

Published: November 7, 2025 | Updated: November 7, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence

When it comes to precipitation-hardening stainless steels, UNS S45000—widely known as Custom 450—offers an exceptional balance of high strength, excellent corrosion resistance, and ease of fabrication, making it a top choice for engineers across aerospace, medical, and oil & gas sectors. As a dedicated producer and exporter from our cutting-edge facilities in China, Gangsteel has manufactured and supplied thousands of tons of UNS S45000 material, helping clients meet stringent specs with reliable equivalents and performance charts.

If you're cross-referencing equivalents like XM-25 or analyzing specs for a high-stress component, this guide provides a clear, actionable chart alongside in-depth explanations to streamline your decision-making.

We've experienced the value firsthand: In a 2024 aerospace collaboration with a European manufacturer, our UNS S45000 bars—matched to Custom 450 specs—delivered consistent hardening across conditions, enabling landing gear parts that withstood 1,000+ cycles without failure, as validated by their fatigue tests. UNS S45000 isn't a one-trick alloy; its age-hardenable nature allows tailoring properties to match equivalents like EN 1.4594, all while maintaining a density of 7.76 g/cm³ for weight-optimized designs. Often spec'd under ASTM A564 or AMS 5864, this grade's equivalents and specs chart isn't just data—it's a tool for efficiency. Let's break it down, from equivalents to detailed charts, applications, and how Gangsteel can supply your needs with stock ready for immediate shipment.

What is UNS S45000 (Custom 450)? A Quick Overview

UNS S45000, branded as Custom 450®, is a precipitation-hardening (PH) martensitic stainless steel developed by Carpenter Technology for applications requiring high strength (up to 1,310 MPa) with corrosion resistance comparable to 304 SS. Unlike traditional martensitics, it hardens via low-temperature aging (480-620°C) through copper precipitates, minimizing distortion and allowing machining in the soft state. This makes it versatile for forms like plates, bars, and forgings.

Key highlights:

• Density: 7.76 g/cm³ – Lighter than many SS for aerospace weight savings.
• Corrosion Resistance: PREN ~25-28; good in chlorides, mild acids, and atmospheres.
• Standards: ASTM A564 (bars/sheets), A693 (plates), AMS 5864 (aerospace).
• Equivalents: XM-25 (ASTM), EN 1.4594, JIS SUS XM-25 – Often interchangeable with minor adjustments.

Gangsteel stocks UNS S45000 in 1-200mm thicknesses, with ASME dual certs for global use. Its Custom 450 name reflects "customizable" properties via aging conditions (H900 for max strength, H1150 for ductility). From our mill, we've seen it outperform 17-4PH in corrosion while matching strength at lower cost.

For broader options, explore our uns stainless steel plates lineup.

UNS S45000 Equivalents: Key Cross-References

UNS S45000 has several equivalents across global standards, allowing seamless substitution in designs. These share similar chemistry (low C, high Cr/Ni/Cu) and PH hardening, with minor variations in Mo or Nb for specific properties. Gangsteel offers dual-certified material to bridge these, ensuring compliance without redesigns.

Equivalents Chart

These equivalents allow for cost savings—e.g., using EN 1.4594 in EU projects without retesting. Always verify with mill certs; Gangsteel's stock includes equivalents for seamless swaps.

Custom 450 Specs Chart: Chemical, Mechanical, and Physical Properties

Custom 450's specs are highly tunable via aging, with conditions like H900 (max strength) to H1150 (max ductility). Below are charts for quick reference, based on ASTM A564 and typical Gangsteel data.

Chemical Composition Chart (% by Weight, Heat Analysis)

PREN ~25-28 for good chloride resistance.

Mechanical Properties Chart (by Aging Condition)

Properties vary by heat treatment (solution anneal at 900-950°C, then age 4hrs). Minimum values per ASTM A564.

Gangsteel's stock achieves upper ranges, with H1000 often at 1,200 MPa tensile for enhanced fatigue.

Physical Properties Chart

Constant across conditions.

Heat Treatment: Customizing Specs

• Solution Anneal: 900-950°C, air cool—soft base.
• Aging: 480°C (H900) to 620°C (H1150) for 4hrs—tunes strength/hardness.
• Tip: H1000 for balance; Gangsteel's furnaces ensure uniformity.

Corrosion and Fabrication Properties

Corrosion: Similar to 304; PREN 25 resists pitting in chlorides <5,000 ppm, mild acids. NACE-compliant.

Fabrication: Weldable (matching filler, no preheat); machinable annealed.

Applications and Equivalents

Apps: Aerospace gears (H900), medical instruments (H1150), oil valves.

Equivalents: XM-25 (ASTM), 1.4594 (EN), SUS XM-25 (JIS).

Sourcing UNS S45000 from Gangsteel

Stock: 1-200mm plates, bars; $2600-2800 USD/ton FOB. MOQ 1 ton; lead 7-30 days. Certs: 3.1/3.2, third-party.

FAQ: UNS S45000 Equivalents and Specs Answered

Q: What are the main equivalents for UNS S45000 (Custom 450)?A: Key equivalents include XM-25 (ASTM/AMS 5864 for aerospace), EN 1.4594 (X5CrNiMoCuNb15-5 for Europe), JIS SUS XM-25 (Japan), and AFNOR Z6CNDU15-05 (France). These share chemistry (Cr 14-16%, Ni 5-7%, Cu 1.25-1.75%) and PH hardening, with minor Mo/Nb variations. Interchangeable for most apps—e.g., XM-25 for U.S. military, 1.4594 for CE-marked parts. Gangsteel's dual-cert stock bridges these, ensuring specs like 1,310 MPa tensile in H900 match across equivalents.

Q: What is the chemical composition of UNS S45000?A: C 0.05 max, Mn 1.00 max, Si 1.00 max, P 0.040 max, S 0.030 max, Cr 14.00-16.00, Ni 5.00-7.00, Mo 0.50-1.00, Cu 1.25-1.75, Nb 0.15-0.45 (8xC min), Fe balance. This enables PH via Cu precipitates, low C for ductility, Cr/Mo for corrosion (PREN 25). Gangsteel's melts hit tighter tolerances (P/S <0.02), boosting properties like impact.

Q: What are the mechanical specs for Custom 450 in different conditions?A: Per ASTM A564: H900—tensile 1,310 MPa min, yield 1,170 MPa min, elongation 10% min, hardness 388-410 HB. H1150—tensile 965 MPa min, yield 795 MPa min, elongation 14% min, hardness 278-331 HB. Mid-conditions like H1000 balance at tensile 1,170 MPa, yield 1,035 MPa, elongation 12%. Gangsteel's stock achieves 10-20% above min, with charts showing impact 20-55 J at -46°C varying by condition.

Q: How does heat treatment affect UNS S45000 specs?A: Solution anneal at 900-950°C dissolves phases (soft ~270 HB), air cool. Age 4hrs: 480°C (H900) for max strength/hardness, 620°C (H1150) for ductility. Aging tunes specs—inverse strength vs. toughness. No high-temp quench needed, minimizing distortion. Gangsteel's controlled aging ensures uniform specs, with full charts in certs.

Q: What are the physical properties of UNS S45000?A: Density 7.76 g/cm³, melting 1370-1440°C, thermal conductivity 18-25 W/m·K, specific heat 460 J/kg·K, expansion 10.9 × 10^-6 /°C (20-100°C), modulus 200 GPa. These support specs like low expansion for dimensional stability. Gangsteel's data confirms density for weight calcs—e.g., 50mm plate ~388 kg/m².

Q: What applications suit UNS S45000 and its equivalents?A: Aerospace gears/landing gear (H900 strength), medical instruments (H1150 ductility), oil valves (corrosion), power turbines (balance). Equivalents like 1.4594 for EU vessels. Gangsteel's plates in U.S. aircraft saved 15% weight via specs.

Q: How does UNS S45000 compare to other SS grades?A: Vs. 17-4PH (similar PH, but S45000 better corrosion PREN 25 vs. 17), vs. 304 (softer 205 MPa yield but higher PREN ~25), vs. 410 (harder but poorer toughness). Custom 450 offers tunable specs at lower cost. Gangsteel's comparisons show 20% better fatigue than 410.

Q: Where can I buy UNS S45000 with Custom 450 specs?A: Gangsteel stocks 1-200mm at $2600-2800/ton FOB, with specs charts in certs. MOQ 1 ton; lead 7-30 days. Dual-equivalents available—contact for samples or full charts.