ASTM B366 UNS N10276 Hastelloy C276 Elbow Pipe Fittings | ASME B16.9
ASTM B366 UNS N10276 Hastelloy C276 elbow pipe fittings are high-performance butt-weld fittings manufactured for extremely corrosive and high-temperature service. Produced in accordance with ASTM B366 and dimensional standard ASME B16.9, these elbows provide outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking, ensuring long-term reliability in critical industrial systems.
Material Grade – Hastelloy C276 (UNS N10276)
Hastelloy C276 is a nickel-chromium-molybdenum-tungsten alloy known for its exceptional corrosion resistance in both oxidizing and reducing environments.
ASTM Grade: astm-b366 UNS N10276
Product Form: Wrought nickel alloy elbow fittings
N10276 Chemical Composition (wt %)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 14.5 – 16.5 |
| Molybdenum (Mo) | 15.0 – 17.0 |
| Tungsten (W) | 3.0 – 4.5 |
| Iron (Fe) | 4.0 – 7.0 |
| Carbon (C) | ≤ 0.01 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.08 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
| Cobalt (Co) | ≤ 2.5 |
| Vanadium (V) | ≤ 0.35 |
N10276 Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 690 MPa (100 ksi) |
| Yield Strength (0.2% offset) | ≥ 283 MPa (41 ksi) |
| Elongation | ≥ 40% |
| Reduction of Area | ≥ 50% (typical) |
Hastelloy C276 provides an excellent combination of strength, ductility, and toughness, even after welding.
Hardness
| Scale | Typical Value |
|---|---|
| Brinell Hardness | ≤ 220 HB |
| Rockwell | Approx. HRB 90 |
Hardness is controlled by solution annealing to ensure corrosion resistance and formability.
Heat Treatment
Standard Heat Treatment: Solution Annealed
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Temperature: 1120 – 1175°C (2050 – 2150°F)
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Cooling: Rapid quench (water or air)
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Product Type & Dimensions
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Elbow Types: 45°, 90°, 180°
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Radius: Long Radius (LR) / Short Radius (SR)
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Size Range: NPS 1/2″ – 48″
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Wall Thickness: SCH 10, SCH 40, SCH 80, SCH 160, XXS
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End Type: Butt Weld (BW)
Standards & Testing
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Material Standard: ASTM B366
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Dimension Standard: ASME B16.9
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Testing: Chemical analysis, tensile test, PMI
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Optional NDT: UT / RT / PT
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Certification: EN 10204 3.1 / 3.2
ASTM B366 UNS N10276 Hastelloy C276 Elbow 90deg LR ASME B16.9
Applications of N10276 Pipe fittings
ASTM B366 UNS N10276 Hastelloy C276 elbow fittings are widely used in:
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Chemical & petrochemical processing
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Oil & Gas production
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Flue Gas Desulfurization (FGD) systems
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Pulp & paper industry
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Pharmaceutical and fine chemicals
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Waste treatment & pollution control
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Marine and offshore environments
