Corrosion Resistant Hastelloy C276 Round Bar for Seawater Application in Solution Annealed Condition
Hastelloy C-276 Chromium–Nickel Alloy Round Bar for Shipbuilding
1. Material Description
Hastelloy C-276 (UNS N10276, W.Nr. 2.4819) is a nickel–chromium–molybdenum–tungsten alloy with very low carbon and silicon, designed for excellent corrosion resistance in both oxidizing and reducing media.
It offers outstanding resistance to pitting, crevice corrosion, and stress-corrosion cracking in chloride-bearing and contaminated seawater environments, making it well suited to demanding shipbuilding and offshore conditions.
2. Specifications
Grade & Designations
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Material: Hastelloy C-276 round bar
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UNS: N10276
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W.Nr.: 2.4819
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EN: NiMo16Cr15W
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Product: Hot-rolled / forged / peeled / polished round bar
Typical Size Range
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Diameter: approx. 5–300 mm (larger on request)
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Length: up to 6 m, cut-to-length available
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Supply condition: solution annealed, water-quenched, straightened
3. Key Characteristics
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Excellent resistance to harsh seawater – resists localized corrosion and SCC in natural, polluted, or chlorinated seawater where stainless steels and Cu-Ni alloys can fail.
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Safe in mixed acid / chloride media – suitable for environments containing chlorides plus mineral or organic acids, as found in scrubber and waste-treatment systems.
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High strength with good ductility – provides reliable mechanical performance at room and moderately elevated temperatures.
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Very good weldability – low C and Si help maintain corrosion resistance in the weld heat-affected zone.
4. Our Advantages
From recent sourcing questions for marine nickel alloys, buyers usually focus on corrosion reliability, standards compliance, machining/welding behavior, and service life.
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Standards-compliant and fully traceable
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Supply according to major international standards for C-276 bar with EN 10204 3.1 certificates and heat-number traceability.
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Seawater-proven corrosion performance
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Material selection based on data for C-276 in chloride and mixed acid service, targeting low risk of pitting and crevice corrosion in aggressive marine conditions.
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Shipyard-friendly fabrication
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Bars delivered straight, solution-annealed and machinable, with guidance available for welding procedures and filler selection in marine and offshore projects.
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Lifecycle-oriented alloy choice
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For critical shipboard systems where failure is very costly, C-276 provides a conservative choice compared with lower-alloyed stainless steels, often reducing unplanned repairs over the vessel lifetime.
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5. Chemical Composition
| Grade | UNS | C (max) | Mn (max) | Si (max) | P (max) | S (max) | Cr | Mo | Fe | W | Co (max) | Ni / Others (typical) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C-276 | N10276 | 0.01 | 1.0 | 0.08 | 0.04 | 0.03 | 14.5–16.5 | 15.0–17.0 | 4.0–7.0 | 3.0–4.5 | 2.5 | Ni balance, V ≤0.35 |
| C-22 | N06022 | 0.015 | 0.5 | 0.08 | 0.02 | 0.02 | 20.0–22.5 | 12.5–14.5 | 2.0–6.0 | 2.5–3.5 | 2.5 | Ni balance |
| 625 | N06625 | 0.10 | 0.50 | 0.50 | 0.015 | 0.015 | 20.0–23.0 | 8.0–10.0 | ≤5.0 | – | 1.0 | Ni ≥58, Nb+Ta 3.15–4.15 |
| Alloy 59 | N06059 | 0.01 | 0.50 | 0.10 | 0.025 | 0.015 | 22.0–24.0 | 15.0–16.5 | ≤1.5 | – | 0.30 | Ni balance, Al 0.10–0.40 |
| 686 | N06686 | 0.020 | 1.0 | 0.50 | 0.015 | 0.010 | 20.0–23.0 | 15.0–17.0 | ≤5.0 | 3.0–4.4 | 1.0 | Ni ≥58 |
6. Mechanical Properties
| Grade | Condition | Tensile Strength (MPa) | 0.2% Yield (MPa) | Elongation (%) |
|---|---|---|---|---|
| C-276 | Solution annealed bar | ≈ 790 | ≈ 355 | ≥ 40 |
| C-22 | Annealed bar | ~ 690–770 | ~ 310–380 | ≥ 40 |
| 625 | Annealed bar (ASTM B446) | ≥ 827 | ≥ 414 | ≥ 30 |
| Alloy 59 | Annealed bar | ≥ 690 | ≥ 340 | ≥ 40 |
| 686 | Annealed bar | ≥ 760 | ≥ 345 | ≥ 40 |
7. Applicable Standards
For Hastelloy C-276 round bar (UNS N10276):
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ASTM / ASME: ASTM B574 / ASME SB574 – nickel alloy bar, rod, and wire
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EN / DIN: W.Nr. 2.4819, NiMo16Cr15W (nickel alloy wrought products standards)
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JIS: NW 0276 (nickel-based corrosion-resistant alloy)
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GB / GOST: Corresponding Chinese and Russian designations available on request for classification society projects
8. Application Fields
Typical roles of C-276 round bar in marine and shipbuilding environments:
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Seawater handling: pump shafts, valve stems, and highly loaded components in aggressive or polluted seawater and ballast systems
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Exhaust gas scrubbers: flanges, nozzles, fasteners, and supports exposed to hot acidic chloride condensate
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Desalination and water treatment: parts in high-salinity or high-temperature stages where stainless steels suffer localized attack
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Offshore and special vessels: critical rotating parts or fittings in harsh chemical and mixed acid / chloride service
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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