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C276 alloy tube is a nickel-chromium-molybdenum tubular product identified as UNS N10276 and W.Nr. 2.4819. Its high molybdenum and chromium content, with tungsten and tightly controlled carbon and silicon, makes it suitable for piping, heat-transfer equipment and instrument systems exposed to aggressive chemical and chloride-bearing media.
SAKY METAL supplies C276 seamless tube, welded tube and welded pipe against the standard, dimensions, condition and inspection requirements stated in the purchase order. Final dimensions and certified properties are subject to the applicable specification; actual values shall be confirmed by the MTC.
Product Overview
| Item | Designation | Applicable Standard | Order Notes |
|---|---|---|---|
| Grade | C276 / UNS N10276 | Subject to the selected product specification | State UNS number and product form on the RFQ |
| European designation | W.Nr. 2.4819 / NiMo16Cr15W | EN or DIN requirement when specified | Confirm the governing standard, not only the equivalent grade |
| Seamless pipe and tube | Cold-worked or hot-finished as applicable | ASTM B622 / ASME SB622 | Solution-annealed condition subject to the specification |
| Welded pipe | Longitudinally welded pipe | ASTM B619 / ASME SB619 | Class, heat treatment and testing shall be stated |
| Welded tube | Tube for corrosive or heat-resisting service | ASTM B626 / ASME SB626 | Specify OD, wall, length and test class |
Available Dimensions and Supply Details
Tube dimensions are quoted against the applicable standard or customer drawing. To avoid ambiguity between pipe and tube, state whether the required size is based on outside diameter and wall thickness or on NPS and schedule.
| Parameter | Supply Basis | Common Options | What to Specify |
|---|---|---|---|
| Outside diameter | According to the selected standard | Tube OD or pipe NPS | Exact OD/NPS and tolerance |
| Wall thickness | Specification tolerance applies | Specified wall or pipe schedule | Nominal wall/schedule and minimum-wall requirement |
| Length | Mill length or cut length | Random, fixed or cut-to-length | Length and permissible variation |
| Surface | Subject to manufacturing route | Annealed and descaled, pickled, or bright annealed when applicable | Required appearance and internal-surface condition |
| Ends | Plain ends unless otherwise agreed | Square cut, deburred, beveled, capped | End preparation or customer drawing |
Chemical Composition
The following limits are a typical reference for UNS N10276. Compliance is subject to the applicable product specification, and actual heat chemistry shall be confirmed by the MTC.
| Ni | Cr | Mo | Fe | W | Co | C | Mn | V | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance | 14.5–16.5 | 15.0–17.0 | 4.0–7.0 | 3.0–4.5 | 2.5 max. | 0.010 max. | 1.0 max. | 0.35 max. | 0.08 max. | 0.04 max. | 0.03 max. |
Mechanical Properties
Typical minimum room-temperature requirements for annealed UNS N10276 seamless pipe and tube under ASTM B622 are shown below. Requirements can differ for welded products, cold-worked conditions or another governing standard.
| Condition | Tensile Strength | 0.2% Yield Strength | Elongation |
|---|---|---|---|
| Solution annealed, typical ASTM B622 requirement | 690 MPa (100 ksi) min. | 283 MPa (41 ksi) min. | 40% min. |
Typical reference: density is approximately 8.89 g/cm³ at room temperature. These values are not design allowables; actual certified results shall be confirmed by the MTC.
Why C276 Is Selected
- High resistance to pitting and crevice corrosion in many chloride and halide environments.
- Useful resistance to both oxidizing and non-oxidizing acids across many chemical-processing duties.
- Strong resistance to chloride-related stress corrosion cracking compared with many austenitic stainless steels.
- Low carbon and silicon help limit detrimental weld-zone precipitation when proper welding procedures are used.
- Can be formed and welded using suitable nickel-alloy procedures and matching filler metals.
Material selection must still consider chemical concentration, temperature, contaminants, aeration, flow conditions and fabrication history. A corrosion test or end-user material review is recommended for critical service.
Inspection, Testing and Documentation
| Item | Purpose | Availability | Order Requirement |
|---|---|---|---|
| Dimensional and visual inspection | OD, wall, length, straightness and surface review | According to the applicable specification | State any tighter tolerance on the RFQ |
| Chemical and tensile results | Verify heat chemistry and mechanical compliance | Recorded in the supplied material documentation | Specify MTC format and governing standard |
| Hydrostatic or nondestructive electric test | Tube integrity verification | Subject to the applicable specification and product form | Define test method and acceptance basis |
| PMI, UT or PT | Additional grade or integrity verification | Available when specified and applicable | Agree method, extent and acceptance criteria before production |
| EN 10204 3.1 certificate | Traceable inspection documentation | Available when specified | Include in the purchase order |
| Third-party inspection | Independent witness or review | Available when specified | Define agency, hold points and report scope before order |
Fabrication Notes
Welding
GTAW/TIG, GMAW/MIG and SMAW processes can be used with suitable procedures and matching nickel-alloy filler metal. Joint cleanliness, shielding and interpass control are important. Welding procedure qualification remains the fabricator’s responsibility.
Heat Treatment
C276 wrought products are normally supplied solution annealed. A typical reference annealing temperature is approximately 1121°C (2050°F), followed by rapid cooling. The final cycle is subject to the applicable specification, product dimensions and approved manufacturing procedure.
Cutting and End Preparation
Cut-to-length, deburring, beveling and drawing-based end preparation can be discussed during quotation. Protect finished surfaces from iron contamination and identify cut pieces to preserve heat traceability.
Applications
- Chemical-process piping, reactors, columns and transfer lines
- Heat-exchanger, condenser and evaporator tubing
- Pickling, acid-handling and chlorination equipment
- Flue-gas desulfurization and pollution-control systems
- Pulp and paper process equipment
- Sour-gas and offshore components when the governing design specification permits
Packaging
Tube ends can be capped and bundles protected with moisture-resistant wrapping, separators and export-suitable outer packing according to tube size, surface condition and transport route. Special marking, bundle weight limits and wooden-case requirements should be stated on the RFQ.
Why Choose SAKY METAL?
SAKY METAL prepares C276 tube quotations around the buyer’s governing standard, dimensions, quantity, documentation and delivery requirements. Seamless or welded supply, cut lengths, end preparation and additional inspection can be evaluated when clearly specified.
For the most accurate offer, send the complete item description rather than only “C276 tube.” This allows the material form, tolerances, testing and certification scope to be confirmed before production.
FAQ
Is C276 the same material as UNS N10276 and 2.4819?
They are commonly used designations for the C276 alloy family. The purchase order must still state the governing product specification because equivalent grade names alone do not define dimensions, tolerances, testing or certification.
Should I order seamless C276 tube or welded C276 tube?
Choose according to the design code, pressure, size, corrosion duty and project specification. ASTM B622 is commonly used for seamless pipe and tube, ASTM B619 for welded pipe, and ASTM B626 for welded tube. The engineer or end user should approve the product form.
What details are required for a firm quotation?
Provide the standard, seamless or welded form, OD or NPS, wall thickness or schedule, length, quantity, condition, surface, end preparation, test requirements, certificate type and delivery destination.
Can SAKY METAL supply an EN 10204 3.1 certificate?
EN 10204 3.1 documentation is available when specified and agreed in the order. Actual heat chemistry and mechanical values shall be confirmed by the supplied MTC.
Can PMI or third-party inspection be arranged?
PMI and third-party inspection are available when specified. State the method, coverage, acceptance criteria, inspection agency and witness points at the RFQ stage so cost and schedule can be included.
Can C276 tube be cut or prepared to a drawing?
Cut length and end preparation can be supplied according to customer drawings when agreed. Include dimensional tolerances, end details, marking and inspection requirements with the drawing.
Is C276 tube suitable for hydrochloric acid service?
C276 is widely selected for resistance to many hydrochloric-acid environments, but suitability depends on concentration, temperature, contaminants, aeration and flow conditions. Critical service should be reviewed against current corrosion data or confirmed by testing.
How is grade traceability maintained after cutting?
Heat-number transfer and piece marking should be defined in the order. PMI can be added when specified for supplementary grade verification, but it does not replace the MTC or complete product-specification testing.