UNS N10276 (Hastelloy C-276)
Generic Name & Synonyms
Hastelloy C-276, Alloy C276, Nickel Alloy C276,W.Nr. 2.4819, NiMo16Cr15W, NC17D
Product Overview
UNS N10276 (widely recognized as Hastelloy C-276) is a nickel-molybdenum-chromium superalloy fortified with tungsten. Engineered specifically to tackle the most demanding chemical environments, Alloy C276 offers exception corrosion resistance in both reducing and oxidizing media.
Its unique chemical balance prevents grain-boundary precipitation in the weld heat-affected zone (HAZ), making it an ideal choice for complex welded chemical process equipment, pollution control installations, and marine chemical transport systems.
Key Highlights
✅ Unmatched Resistance to Severe Media: Demonstrates superior chemical stability against boiling hydrochloric acid, wet chlorine gas, chlorine dioxide solutions, and concentrated sulfuric acid.
✅ Low-Carbon Microstructure Stability: Extremely low carbon and silicon content prevents intergranular carbide precipitation during welding, enabling immediate use in as-welded conditions without post-weld heat treatment.
✅ Immunity to Localized Crevice Pitting: High molybdenum (16%) and tungsten (3.7%) composition delivers an extraordinarily high Pitting Resistance Equivalent Number (PREN ≥ 48), preventing pitting in aggressive chloride environments.
✅ Resistance to Strong Oxidizing Salts: Performs reliably in solutions containing ferric chloride and cupric chloride, making it the preferred choice for waste treatment and chemical recovery.
✅ Reliable Global Export Partner: Fully inventoried and custom-processed by BELNADE, complying with international design codes (ASTM, ASME, NACE MR0175/ISO 15156) for seamless international delivery.
Chemical Composition & Physical Properties
1. Chemical Composition (Weight %)
Element | Ni | Mo | Cr | Fe | W | Co | Mn | V | Si | C | P | S |
Min. | Bal. | 15.0 | 14.5 | 4.0 | 3.0 | — | — | — | — | — | — | — |
Max. | Bal. | 17.0 | 16.5 | 7.0 | 4.5 | 2.5 | 1.0 | 0.35 | 0.08 | 0.010 | 0.04 | 0.03 |
2. Physical & Mechanical Properties
Parameter | Value / Standard (Solution Annealed State) |
Density | 8.89 g/cm³ (0.321 lb/in³) |
Melting Range | 1325°C – 1370°C (2415°F – 2500°F) |
Tensile Strength (Rm) | ≥ 690 MPa (100 ksi) |
Yield Strength (0.2%, Rp0.2) | ≥ 283 MPa (41 ksi) |
Elongation (A5) | ≥ 40% |
PREN (Pitting Resistance Equivalent No.) | ≥ 48 |
Available Forms & Specifications
BELNADE provides UNS N10276 in diverse mill product forms with complete mill test certification:
Plates, Sheets & Coils: ASTM B575 / ASME SB575; Hot-rolled and cold-rolled finishes from 0.5mm up to 80mm thickness.
Round Bars & Forgings: ASTM B574 / ASME SB574; Annealed, ground, or peeled round bars ranging from 8mm to 300mm diameter.
Seamless & Welded Tubing: ASTM B622 / B619 / B626; High-pressure tubes and pipes for aggressive heat exchangers and transfer lines.
Pipe Fittings & Flanges: ASTM B564 / ANSI B16.5; Weld neck, blind, slip-on flanges, elbows, tees, and reducers.
Welding Filler Metals: ERNiCrMo-4 welding wire and ENiCrMo-4 coated electrodes for high-integrity fabrication.
Typical Application Scenarios
Engineers specify UNS N10276 across critical industries requiring reliable chemical containment and process safety:
Chemical & Petrochemical Processing: Reactors, heat exchangers, reboilers, evaporators, and piping systems handling organic and inorganic chlorides or mixed acid streams.
Flue Gas Desulfurization (FGD): Scrubber towers, reheaters, dampers, and duct liners exposed to aggressive acidic condensates in coal-fired power plants.
Pulp & Paper Manufacturing: Bleach plant equipment, chlorine dioxide bleach washers, digesters, and liquor heating systems.
Waste Treatment & Environmental Protection: Incineration scrubbers, hazardous waste processing vessels, and sour gas recovery units.
Pharmaceutical Synthesis: Reaction vessels, distillation columns, and high-purity fluid transfer components where contamination must be zero.
Quality Assurance & Material Verification
To guarantee zero-defect performance in corrosive operations, BELNADE enforces rigorous quality testing protocols:
Material Traceability: Full certification according to EN 10204 Type 3.1 / 3.2.
Verification Methods:
Positive Material Identification (PMI / XRF Spectrometry)
Mechanical Testing (Tensile, Yield, Elongation, and Hardness Evaluation)
Corrosion Resistance Testing (ASTM G28 Method A/B for intergranular corrosion)
Non-Destructive Evaluation (Ultrasonic Testing, Liquid Penetrant Inspection, Radiographic Inspection)
Dimensional, Flatness, and Surface Quality Control Audit
Supplier Profile: BELNADE
BELNADE is a premier supplier and international distributor of high-performance nickel-based alloys, corrosion-resistant alloys, and specialized metals for critical industries worldwide.
Turnkey Export Management: Customized seaworthy packaging, complete customs documentation support, and flexible shipping options (FCL, LCL, Air Freight).
Advanced Processing Services: Precision CNC plasma, laser, and waterjet cutting, plate shearing, saw cutting, and customized edge beveling.
Dedicated Technical Expertise: Our metallurgical team offers guidance on material selection, welding procedures, and compliance matching for demanding engineering projects.
Get in Touch with BELNADE for Quotes and Technical Inquiries
📧 Email: info@belnade-material.com
🌐 Website: www.belnade-material.com
💬 Mobile/ WhatsApp: +86 158-0040-6687