ASME SB622 UNS N10276 Nickel Alloy Seamless Tube Hastelloy C276 Tube Heat Exchanger Tube
ASTM B622 / ASME SB622 Alloy C276 / UNS N10276 / DIN 2.4819 Seamless Hastelloy Tube
YUHONG GROUP is specialized in manufacturing and supplying heat exchanger tube/boiler tube/condenser tube. Our products has exported more than 55 countries till now and won good reputation among the clients. ASME SB622 UNS N10276 Nickel Alloy Seamless Tube Hastelloy C276 Tube Heat Exchanger Tube is a seamless, nickel-base alloy tube made from UNS N10276, commonly known as Hastelloy C276 / Alloy C276, manufactured according to ASME SB622 (the ASME version of ASTM B622), and intended mainly for heat exchanger service.
In simple terms, it is a weldless Hastelloy C276 tube produced to the ASME SB622 specification for use in shell-and-tube heat exchangers, condensers, evaporators, and similar corrosion-resistant heat-transfer equipment.
Equivalent Grade of ASME SB622 UNS N10276 Nickel Alloy Seamless Tube Hastelloy C276 Tube
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | OR | GOST |
| Hastelloy C276 | N10276 | 2.4819 | - | NiMo16Cr15W | NW 0276 | ЭП760 | ХН65МВУ |
Chemical Composition of ASME SB622 UNS N10276 Nickel Alloy Seamless Tube Hastelloy C276 Tube
| Hastelloy C276 | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr |
| Balance | 0.010 max | 15.00 – 17.00 | 1.00 max | 0.08 max | 4.00 – 7.00 | 0.04 max | 0.03 max | 2.5 max | 14.50 – 16.50 |
Mechanical Properties of ASME SB622 UNS N10276 Nickel Alloy Seamless Tube Hastelloy C276 Tube
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.89 g/cm3 | 1370 °C (2500 °F) | Psi – 52,000 , MPa – 355 | Psi – 1,15,000 , MPa – 790 | 40 % |
Key Characteristics of Using Grade UNS N10276/ Hastelloy C276
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Excellent resistance to oxidizing and reducing acids
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Outstanding resistance to chlorides, seawater, brine, and hypochlorite
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Resistant to pitting, crevice corrosion, and stress corrosion cracking
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Good resistance to sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, formic acid
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Good weldability using matching fillers such as ERNiCrMo-4 / ENiCrMo-4
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Good high-temperature stability
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Preferred for severe corrosion and pressure-tight heat exchanger service
Choose ASME SB622 UNS N10276 / Hastelloy C276 seamless heat exchanger tube when the service is too corrosive or too critical for stainless steel. Main situation:
| When | Short reason |
|---|---|
| Strong acids: HCl, H₂SO₄, H₃PO₄, acetic, formic, mixed acids | C276 resists both oxidizing and reducing acids. |
| Chlorides, seawater, brine, hypochlorite | Excellent resistance to pitting, crevice corrosion, and SCC. |
| Chemical / petrochemical / pharmaceutical heat exchangers | Handles aggressive media where 316L, 904L, duplex, or 6Mo may fail. |
| High-pressure or critical heat exchanger service | Seamless tube avoids weld-seam weakness and leakage risk. |
| Code requires ASME SB622 / ASTM B622 | Ensures pressure-code compliance and traceability. |
| High temperature + corrosive environment | Good high-temperature corrosion resistance and stability. |
| U-bent or severe bending heat exchanger tubes | Seamless C276 has good ductility and uniformity. |
Applications
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Shell-and-tube heat exchangers
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Condensers and evaporators
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Chemical processing equipment
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Petrochemical equipment
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Flue gas desulfurization systems
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Pollution control scrubbers
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Pulp and paper processing
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Marine and seawater systems
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Nuclear fuel reprocessing and waste treatment
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