15-5PH Stainless Steel Casting Manufacturer
Precision Steel Cast is a 15-5PH stainless steel casting manufacturer producing XM-12 precipitation-hardening components for the applications where strength and toughness cannot be compromised — aircraft brackets, structural fittings, actuator housings and landing-gear hardware. 15-5PH earns its place by delivering high strength through a gentle, low-temperature aging treatment while keeping the toughness that 17-4PH sometimes sacrifices in the transverse direction. That combination is why airframers and defense programs reach for it.
As a precipitation hardening casting supplier, we understand that the heat treatment is the product. A 15-5PH part is only as good as its aging temper and its traceability. Our controlled melting, in-house heat treatment and spectrometric verification are what turn a casting into a qualified, high-strength component.
Introduction
Precipitation-hardening stainless grades solve a specific problem: how to get near-tool-steel strength while keeping stainless corrosion resistance and good fabrication behavior. 15-5PH does this by aging at a modest temperature after casting, precipitating fine copper-rich particles that lock the martensitic matrix in place. The result is a casting that can be machined in a soft condition and then aged to full strength — convenient, repeatable and documentable.
For structural engineers, 15-5PH is the conservative high-strength choice. Its improved transverse toughness over 17-4PH matters in parts that see multi-axial loads and fatigue, and its castability lets complex brackets be made as a single near-net-shape part instead of a welded fabrication. Investment casting is ideal because it reproduces the integrated features — bosses, ribs, cored passages — that make a 15-5PH bracket both light and strong.
Manufacturing Capability
Precision Steel Cast runs the full 15-5PH casting process under one roof:
| Stage | Capability |
|---|---|
| Tooling | Hardened steel dies and wax tooling built for repeatable PH production. |
| Pattern | Automatic wax injection for consistent, low-variation patterns. |
| Shell | Multi-layer silica sol ceramic shells for clean, dense cavities. |
| Melting | Induction furnaces with precise 15-5PH chemistry control. |
| Heat Treat | Low-temperature aging to the specified H-temper. |
| Machining | Rigid CNC centers finish locating and functional features. |
| Inspect | Spectrometer, CMM and NDT verify chemistry, geometry and integrity. |
Because tooling, pouring, heat treatment and machining share one workshop, a 15-5PH program never loses accountability in a vendor hand-off. The team that controls the heat is the team that ages and machines the part, so when a bracket leaves our building we can prove exactly what it is made of.
Production Process
Every 15-5PH casting begins with a review of the drawing and the specified temper, followed by hardened tooling sized for the run. Wax patterns are injected and assembled, then built into a fine silica sol ceramic shell. After dewaxing and pour, the casting is solution treated and aged to the target H-temper. Functional features are then CNC machined to drawing. Final inspection confirms chemistry, temper, dimensions and, where specified, NDT before certification and packing.
Material Options
We cast the precipitation-hardening family to match duty:
- 15-5PH / XM-12 (cast) — high strength with improved transverse toughness.
- 15-5PH H1025 / H1150 — common aging tempers balancing strength and toughness.
- 17-4PH — an alternative PH grade where specified.
- Custom PH tempers — matched to a customer specification.
Our quoting process states the temper recommendation explicitly so the component meets both strength and toughness targets.
Surface Finishing
15-5PH components need finishes that protect strength and resist corrosion. We apply:
- Passivation — reinforces the chromium oxide film for corrosion resistance.
- Shot blasting — cleans and prepares the as-cast surface.
- Cadmium-free coating (option) — a modern, restricted-substance alternative.
- Anodize-ready preparation — where a downstream coating is specified.
Finishes are selected to match the service environment and the assembly’s requirements.
Tolerance Capability
As-cast 15-5PH features typically hold ISO 8062 CT4 to CT6 tolerances. The features that locate and function — mounting faces, bores, threads and datums — are refined on our CNC centers to ±0.01 mm so the part assembles without correction. Because the grade is machined before aging, we control distortion through the heat-treat cycle so finished features stay accurate.
Quality Control
Quality is engineered in, not inspected in. Our 15-5PH program includes:
- Heat chemistry verification with a direct-reading spectrometer before pour.
- Heat-treatment records documenting the aging temper and cycle.
- Dimensional inspection on CMMs against the CAD model.
- Traceability — material certificates, dimensional reports, heat numbers and process records travel with the order.
A foundry that cannot prove the temper of a PH heat is a foundry that cannot be qualified into a structural supply chain — so we make the evidence part of the product.
Applications
15-5PH stainless castings from Precision Steel Cast are found in:
- Aircraft and airframe brackets
- Structural fittings and couplings
- Actuator and sensor housings
- Landing-gear and control hardware
- High-strength fasteners and linkages
- Defense and space structural parts
Each application is reviewed for load, temperature and corrosion exposure so the temper, tolerance and finish are matched to duty.
Industries Served
- Aerospace — airframe structural and functional parts.
- Defense — durable components for land, sea and air platforms.
- Space — lightweight, high-strength specialized components.
- Oil & Gas — high-strength, moderately corrosion-resistant hardware.
- Industrial Equipment — structural castings where strength matters.
- Unmanned Systems — mass-critical castings for UAVs.
Because we supply globally, our documentation and packing are aligned with international aerospace and defense procurement standards.
Design for Manufacturability
The most cost-effective 15-5PH casting is designed with the process in mind from the first sketch. Our engineers review every inquiry for wall thickness, draft, parting line and the placement of machined features. Where a modest change in geometry can improve shell stability, reduce hot spots or remove a machining operation, we propose it before any tooling is cut. Good design for manufacturability is the difference between a part that machines easily and one that fights you at every step.
Technical FAQ
15-5PH (also called XM-12) is a martensitic precipitation-hardening stainless steel. It is strengthened by a low-temperature aging heat treatment and offers a good combination of high strength, toughness and moderate corrosion resistance.
15-5PH is a refinement of 17-4PH with improved transverse toughness and better forgeability/castability, making it a strong choice for structural aerospace parts where toughness matters.
Depending on the aging temper, 15-5PH can reach tensile strengths well above 1000 MPa while retaining useful toughness, with properties confirmed by heat-treatment certification.
Aircraft brackets, structural fittings, actuator housings, landing gear parts, couplings and high-strength fasteners built to drawing.
Yes. We age castings to the specified temper and supply heat-treatment records, material certificates and dimensional reports so the properties are traceable.
Send drawings, temper requirement, specification and quantities via the quote form or to hank@precisionsteelcast.com; we return a feasibility review and quotation within 24 hours.
Request a Quote
Precision Steel Cast is ready to support your next 15-5PH program. Learn more about our related capabilities:
- 17-4PH Stainless Steel Casting
- Aerospace Investment Casting Manufacturer
- 410 Stainless Steel Casting Manufacturer
- Investment Casting Manufacturer
- CNC Machining Services for Castings
You can also visit our main site at Precision Steel Cast or email hank@precisionsteelcast.com.