Nimonic 81 UNS N07081 Round Bar is supplied for high-temperature oxidation and hot-corrosion service. Diameter, condition, heat treatment, testing, machining allowance and documentation are reviewed against the purchase specification.
Nimonic 81 UNS N07081 Round Bar Specification
| Alloy |
Nimonic grade |
| UNS / W.Nr. |
N07081 / 2.4958 |
| Reference standards |
BS HR 201 or customer specification |
| Product forms |
Round bar, forged bar, peeled bar, ground bar and cut lengths |
| Supply condition |
Solution-treated, precipitation-treated or other agreed condition |
| Dimensions |
Diameter and length confirmed with quotation and production availability |
| Surface |
Black, peeled, turned, polished or centerless-ground by agreement |
| Documentation |
EN 10204 3.1 certificate and requested inspection records |
Available Forms and Processing
| Production routes |
Hot rolled, forged, peeled, turned and precision ground |
| Cutting |
Saw-cut blanks and fixed lengths |
| Machining allowance |
Added only when specified for subsequent finishing |
| Straightness / tolerance |
Commercial or precision tolerances agreed before production |
| Ends |
Plain, chamfered or customer-specified end preparation |
Equivalent Designations
| UNS |
N07081 |
| Werkstoff |
2.4958 |
| Trade designation |
Nimonic grade stated in the product title |
| Important note |
Cross-references do not replace the ordered standard; acceptance depends on chemistry, condition, properties and inspection requirements. |
Typical Chemical Composition
| Nominal composition |
Ni balance; Cr 28.0–31.0%; Ti 1.8–2.7%; Al 0.9–1.5%; C ≤0.10% |
| Verification |
Final acceptance uses the heat analysis limits in the ordered material specification. |
| Traceability |
Heat number remains linked to the certificate and package marking. |
Typical Physical Properties
| Density |
8.15 g/cm³ |
| Property basis |
Published typical values are guidance values, not guaranteed acceptance criteria. |
| Design use |
Use temperature-dependent design data from the governing specification or an approved engineering source. |
Mechanical Properties and Heat Treatment
| Condition |
Strength and ductility depend on diameter, solution treatment and precipitation-hardening cycle. |
| Acceptance |
Tensile, yield, elongation, reduction of area and hardness follow the ordered specification. |
| Heat treatment |
Temperature uniformity, cooling practice and batch records should be agreed for critical orders. |
| Test sampling |
Test orientation, location and frequency follow the governing standard or approved inspection plan. |
Machining and Fabrication Guidance
| Machining |
Use rigid tooling, positive feeds and suitable coolant; avoid dwell that work-hardens the surface. |
| Forging |
Control working range and reduction; avoid processing below the approved finishing temperature. |
| Welding |
Use qualified procedures appropriate to the alloy, condition and intended service. |
| Post-processing |
Verify dimensions, surface integrity and required NDT after machining or forming. |
Inspection and Quality Documentation
| Material certificate |
EN 10204 3.1 or agreed alternative |
| Identification |
Grade, heat number, diameter, length and package marks |
| Optional testing |
PMI, UT, PT, dimensional report, hardness or third-party inspection by agreement |
| Quotation inputs |
Standard, diameter, length, quantity, condition, tolerance, tests, documentation and destination |
Applications
Typical procurement enquiries include furnace hardware, combustion-system components, thermal fasteners and hot-section machined parts. Suitability must be confirmed for temperature, atmosphere, stress, fatigue and processing route.
Nimonic 81 UNS N07081 Round Bar Packaging
Bars are bundled or placed in export cases according to diameter, surface condition and shipping route. Protection and package markings preserve traceability to the material documents.
Procurement Confirmation
| Please provide |
Grade and standard; diameter and length; quantity; condition; tolerance and surface; test and certificate requirements; destination and requested delivery date |
| Quotation review |
Availability, production route, technical compliance, packing and lead time are confirmed before acceptance. |
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