Material Comparison & Machining Guide
Hastelloy C-22 vs Hastelloy C-276: Precision Machining Guide for Aerospace, Medical & Harsh Chemical Environments
AXALLOY Precision is a Shenzhen-based CNC machining partner specializing in complex, high-value components made from difficult-to-machine alloys. We support international engineering, procurement, and quality teams from prototype development through low-volume and repeat production.
Two Premium Superalloys, One Standard of Precision
We focus on Hastelloy C-22 (UNS N06022) and Hastelloy C-276 (UNS N10276), two premium nickel-chromium-molybdenum superalloys prized for exceptional corrosion resistance in oxidizing, reducing, and mixed-acid environments. These alloys are common in aerospace, medical devices, semiconductor equipment, energy, oil & gas, marine, robotics, and precision industrial applications.
As a best-fit partner for OEMs, Tier 1/2 suppliers, engineering firms, and contract manufacturers (especially in North America, Europe, UK, Australia, NZ, and advanced Asian markets), AXALLOY delivers the manufacturability, process control, documentation, and dependable communication that pure price-focused buyers do not require.
Volume Range
Prototype (1–20 pcs) → Low-volume (20–500) → High-mix / repeat (up to 10,000+ pcs)
Lead Time
5–10 business days (prototype) | 10–20 business days (standard) | Expedited available
Chemical Composition & Mechanical Properties
Both alloys deliver outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking, plus broad chemical compatibility. The table below highlights the key elemental differences that drive material selection.
| Property | Hastelloy C-22 (UNS N06022) | Hastelloy C-276 (UNS N10276) |
|---|---|---|
| Ni | Bal. (min 50%) | Bal. |
| Mo | 12.5–14.5% | 15.0–17.0% |
| Cr | 14.5–16.0% | 14.5–16.5% |
| W | 2.5–3.5% | 3.0–4.5% |
| Fe | 2.0–6.0% | 4.0–7.0% |
| C | ≤0.015% | ≤0.015% |
| Mn | ≤1.0% | ≤1.0% |
| Si | ≤0.08% | ≤0.08% |
| Cu | ≤0.50% | ≤0.50% |
| P | ≤0.03% | ≤0.03% |
| S | ≤0.03% | ≤0.03% |
C-22 Performance Edge
Excels in oxidizing acids, mixed acids, and oxidizing environments due to its higher Cr + Mo balance.
C-276 Performance Edge
Performs better in strongly reducing acids and offers slightly better cost sensitivity in certain reducing applications.
Both alloys are fully heat-treatable, weldable, and suitable for high-temperature service (up to ~900 °C).
Machining Considerations for Difficult Alloys
C-22 and C-276 are among the most challenging nickel-based superalloys to machine — they work-harden rapidly, harden during machining, and require controlled parameters to avoid tool wear, distortion, or subsurface cracking.
| Process | Key Parameter Considerations | Typical Achievable Tolerance / Finish |
|---|---|---|
| 3/4/5-axis Milling | 15–25% higher spindle power, slower feeds (30–50% of steel), 3–4 flutes carbide or coated tools | ±0.005 mm, Ra 0.8–1.6 µm (precision) |
| Turning / Mill-Turn | Lower RPM, high-pressure coolant, polished inserts | ±0.005 mm, Ra 0.8 µm |
| Swiss CNC | Ø0.5–32 mm bar, live tooling, short chip control | ±0.005 mm |
| Wire / Sinker EDM | Die-sinking or wire for sharp corners & internal features | ±0.005 mm, Ra 0.4–0.8 µm (EDM) |
| Precision Grinding | Light cuts, vitrified wheels, spark-out | ±0.002 mm, Ra 0.2 µm |
Minimum Features (Same for Both Alloys)
- Wall thickness0.5 mm
- Hole diameterØ0.5 mm
- ThreadM1.0
- Internal radiusR0.3 mm
Surface Finish & Tolerance Targets
- •Standard: ±0.010 mm
- •Precision: ±0.005 mm
- •Fully supported by AXALLOY's controlled environment and CMM (up to 1.8 + L/300 µm accuracy)
Best-Fit Applications
C-22 and C-276 components are routinely machined across demanding industries where corrosion resistance and material integrity are non-negotiable.
Aerospace & Defense
Exhaust nozzles, valve bodies, heat shields, landing gear components
Medical Devices
Surgical instruments, implants, pharmaceutical process equipment
Semiconductor & Energy
Chemical vapor deposition (CVD) parts, high-purity reactors
Oil & Gas / Marine
Offshore valves, subsea connectors, sour service fittings
Robotics & Automation
Precision housings, actuators, connectors
Full Documentation Included
Material traceability, first-article inspection (FAI), dimensional reports, certificates of conformance, and complete quality documentation — exactly what your engineering, procurement, and quality teams demand.
AXALLOY's Proven Machining Capabilities for Hastelloy Alloys
- ✓ Multi-axis CNC milling (3/4/5-axis), mill-turn, and Swiss turning
- ✓ EDM (wire & sinker) for sharp internal corners
- ✓ Precision grinding for sealing surfaces and bearing fits
- ✓ Full engineering support (DFM, tolerance review, fixture planning)
- ✓ Inspection: CMM, optical measurement, hardness testing, surface roughness (Ra 0.05–40 µm)
- ✓ Documentation: Material test reports, heat-treatment certificates, ballooned drawings, traceability records
1 pc
Minimum Order
1,000 kg
Maximum Part Weight
24–48h
Quote Turnaround
Why Choose AXALLOY for Your C-22 or C-276 Projects?
We evaluate material behavior, geometry, tolerances, surface requirements, and production volume before defining the process — ensuring zero surprises and full process control.
We Are Not an Ideal Fit For:
- ✗ Commodity parts purchased only on lowest price
- ✗ Incomplete drawings
- ✗ Unauthorized reproduction
We Excel When You Need:
- ✓ Complex geometry with thin walls or critical interfaces
- ✓ Tight geometric tolerances and demanding surfaces
- ✓ Export-ready documentation and traceability
- ✓ Stable, high-value production routes
Ready to Start Your Project?
Upload your 3D CAD (STEP, IGES, etc.) or 2D drawing (PDF/DWG), define the material (C-22 or C-276), specify quantities, tolerances, and target date — we will provide a firm quote within 24–48 hours.
Contact us today to discuss your Hastelloy C-22 or C-276 component requirements. Our team of engineers and quality specialists is ready to deliver precision, reliability, and full documentation that your global teams trust.
AXALLOY Precision – Precision Machining for Difficult Alloys
Shenzhen, China | International engineering support | ISO-aligned quality system