UNS N06059 (Hastelloy C-59)
Generic Name & Other Designation
Hastelloy C-59®, Alloy 59, Nickel Alloy 59, W.Nr. 2.4605, NiCr23Mo16, NC23Mo16
Product Overview
UNS N06059 (Alloy 59) is an ultra-pure nickel-chromium-molybdenum alloy engineered for critical applications where mechanical integrity and corrosion resistance must not be compromised. Featuring 23% chromium and 16% molybdenum with ultra-low elemental carbon and silicon impurities, UNS N06059 sets a high benchmark for thermal stability and corrosion defense.
It is selected for extremely hazardous chemical processes, high-salinity offshore systems, and municipal waste handling where conventional nickel alloys experience localized pitting or HAZ sensitization.
Key Highlights
✅ Ultra-Low Carbon & Silicon: Virtually eliminates phase precipitation during hot working and welding.
✅ Unmatched Pitting Resistance: PREN index exceeds 70, placing it at the pinnacle of Ni-Cr-Mo alloys.
✅ Thermal Aging Resistance: Retains excellent ductility and corrosion resistance even after thermal exposure.
✅ Chloride & Halogen Guard: Superior defense against severe crevice attack in concentrated chloride solutions.
Chemical Composition & Physical Properties
Chemical Composition (wt%)
Element | Ni | Cr | Mo | Fe | Al | C | Si | Mn | Co | P | S |
Min (%) | Bal. | 22.0 | 15.0 | — | 0.10 | — | — | — | — | — | — |
Max (%) | (~59.0) | 24.0 | 16.5 | 1.50 | 0.40 | 0.010 | 0.05 | 0.50 | 0.30 | 0.015 | 0.010 |
Physical & Mechanical Properties
Parameter | Value / Standard (Solution Annealed) |
Density | 8.60 g/cm³ |
Melting Range | 1310°C – 1360°C |
Tensile Strength (Rm) | ≥ 690 MPa |
Yield Strength (0.2%, Rp0.2) | ≥ 340 MPa |
Elongation (A5) | ≥ 40% |
Available Forms
Heavy Plates & Sheets: Process vessel shells, flange blanks, reactor heads.
Seamless Tubing: Heat exchanger bundles, high-pressure reaction lines.
Forged Bars: Shafting stock, valve stems, heavy ring forgings.
Welding Fillers: Matching Alloy 59 welding wire and electrodes.
Typical Application Scenarios
Green Energy & Waste: Waste incineration scrubbers, flue gas desulfurization systems.
Offshore Oil & Gas: Seawater heat exchangers, downhole chemical injection lines.
Fine Chemicals: Reaction columns handling mixed mineral acids and halogen compounds.
Quality Assurance & Testing
Intergranular corrosion testing per ASTM G28 Method A.
Ultrasonic, radiographic, and microstructural analysis.
Certified to EN 10204 3.1 with comprehensive material traceability.
Supplier Information (BELNADE)
Supplied by BELNADE, a vendor for high-performance superalloys. BELNADE delivers certified UNS N06059 products with customized processing options and worldwide logistics.
Get in Touch with BELNADE for Quotes and Technical Inquiries
📧 Email: [email protected]
🌐 Website: www.belnade-material.com
💬 Mobile/ WhatsApp: +86 183 6997 5713