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Nimonic 90 (UNS N07090) Round Bars - AMS 5829 Supplier in Mumbai
Nimonic 90 has superior creep-rupture strength compared to Nimonic 80A and can be used for long-term applications up to 920°C. This wrought, age-hardenable nickel-chromium-cobalt alloy (UNS N07090, W.Nr. 2.4632 / 2.4969) gains its strength from titanium and aluminium precipitation hardening of the γ′ phase. The 15-21% cobalt addition solid-solution strengthens the matrix and raises the γ′ solvus. Primary applications include turbine blades, high-temperature springs, hot-working tools, and exhaust valves. In the aged condition (8h/1080°C/AC + 16h/700°C/AC), forged Nimonic 90 bar reaches a typical 0.2% proof stress of 791 MPa (115 ksi) and tensile strength of 1251 MPa (181 ksi). Typical 1175-1265 MPa depending on form. At 700°C, the forged bar retains 690 MPa proof stress – nearly 87% of its room-temperature value. Oxidation resistance is good to 900°C in continuous heating (2.52 mg/cm² loss at 100h). Corrosion resistance meets NACE MR0175 / ISO 15156-3 within specified hardness limits. Bar diameters range from 5 mm to 200 mm in lengths of 1-6 metres per AMS 5829 and BS HR2 / HR501 / HR502 / HR503. Available forms include round bar, hex bar, flat bar, forged bar, and rod.
Nimonic Alloy 90 Bar Specifications
| Grade | Nimonic 90 / Alloy 90 |
|---|---|
| Standards | AMS 5829, BS HR2 / HR501 / HR502 / HR503 |
| Forms | Round Bar, Rod, Hex Bar, Flat Bar, Forged Bar |
| Diameter | 5 mm – 200 mm |
| Length | 1000 – 6000 mm, cut-to-length |
| Condition | Solution Treated + Aged |
| Finish | Black, Bright, Polished, Centreless Ground |
| Hardness | 250-350 HV (aged) |
Chemical Composition of Nimonic 90 Bar & Rod
| Element | Nickel (Ni) | Chromium (Cr) | Cobalt (Co) | Titanium (Ti) | Aluminium (Al) | Carbon (C) | Iron (Fe) | Manganese (Mn) | Silicon (Si) | Copper (Cu) | Boron (B) | Zirconium (Zr) | Sulphur (S) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Composition | Balance (≥53%) | 18.0 – 21.0 | 15.0 – 21.0 | 1.8 – 3.0 | 1.0 – 2.0 | 0.13 max | 3.0 max | 1.0 max | 1.0 max | 0.2 max | 0.02 max | 0.15 max | 0.015 max |
Mechanical Properties of AMS 5829 Nimonic 90 Round Bar
| Property | Proof 0.2% | Tensile | Elongation | RA | Hardness |
|---|---|---|---|---|---|
| BS HR2 Min | ≥695 MPa | ≥1080 MPa | ≥20% | – | ≥310 HV |
| Extruded (typ.) | 729 MPa | 1175 MPa | 30% | 47% | 250-350 HV |
| Forged (typ.) | 791 MPa | 1251 MPa | 28% | 41% | 250-350 HV |
Mechanical Properties of AMS 5829 Nimonic 90 Round Bar
| Property | Proof 0.2% | Tensile | Elongation | RA | Hardness |
|---|---|---|---|---|---|
| Aged (ST+Age) | 620 MPa (90 ksi) | 1000 MPa (145 ksi) | ≥15% | ≥20% | 250–350 HB |
| Solution Treated | 350 MPa | 750 MPa | ≥30% | – | – |
Physical Properties of Nimonic 90
| Property | Density | Melting Range | Elastic Modulus (20°C) | Thermal Expansion (20-600°C) | Thermal Conductivity (20°C) | Electrical Resistivity | Magnetic |
|---|---|---|---|---|---|---|---|
| Value | 8.18 | 1310-1370 | 213 (forged bar) | 14.8 × 10⁻⁶ | 11.47 | 1.15 | Weakly ferromagnetic |
| Unit | g/cm³ | °C | GPa | /°C | W/m·K | µΩ·m | – |
Nimonic 90 Round Bar Equivalent Grades
A comprehensive guide to equivalent designations for Alloy 90 bar, including international specifications and trade names used in various manufacturing industries worldwide.
| UNS | Werkstoff Number | DIN | EN |
|---|---|---|---|
| N05500 | 2.4375 | NiCu30Al | NiCu30Al |
Get Nimonic 90 Round Bars at Competitive Prices
Available Forms of Nimonic 90 Bar & Rod
Nimonic 90 Forged Bar
Nimonic 90 Cold-Drawn Bar
Nimonic 80A Forged Bar
Nimonic 90 Hex Bar
Nimonic 90 Flat
Nimonic Alloy 90 Rod
Nimonic 90 Flat
Nimonic 90 Extruded Bar
Nimonic Square Bar
Elevated Temperature Properties of Nimonic 90 Bar
| Temp °C | Ext. Proof MPa | Ext. UTS MPa | Frgd Proof MPa | Frgd UTS MPa |
|---|---|---|---|---|
| 20 | 729 | 1175 | 791 | 1251 |
| 400 | 661 | 1081 | 715 | 1148 |
| 600 | 657 | 1027 | 698 | 1092 |
| 700 | 621 | 899 | 690 | 965 |
| 800 | 510 | 657 | 551 | 683 |
| 900 | 288 | 349 | 284 | 346 |
At 700°C, the forged bar retains 690 MPa proof stress which is 87% of room temperature. This retention under prolonged thermal exposure is what makes UNS N07090 reliable for turbine blades, bolting, and springs operating between 600°C and 920°C.
Creep-Rupture Strength & Thermal Stability of Nimonic 90 Bar
| Temp °C | 100h MPa | 1000h MPa | 10000h MPa |
|---|---|---|---|
| 700 | 417 | 332 | (248) |
| 750 | 275 | 209 | (152) |
| 815 | 139 | (105) | – |
| 870 | (74) | – | – |
At 750°C/1000h, Nimonic 90 bar withstands 209 MPa that is sufficient for turbine blade root loading. Stress relaxation at 600-0700°C exceeds Nimonic 80A, critical for gas turbine casing bolts. Oxidation weight loss at 900°C/100h is 2.52 mg/cm². Charpy impact at RT: ~78 J (forged bar), with retained toughness after 10,000h at 700-900°C.
Hot Working, Cold Working & Heat Treatment of Nimonic 90 Bar
Hot work at 1050-1200°C. More power is required than for 80A due to the cobalt-strengthened matrix. Nimonic 90 work-hardens rapidly during cold working; intermediate anneals are needed for large reductions.
Solution treat at 1080°C for 8 hours, air cool. Age at 700°C for 16 hours, air cool. This produces maximum γ′ precipitation. Weld using matching Nimonic 90 filler wire (GTAW, GMAW, SMAW). Post-weld solution + aging is recommended for full strength recovery.
Industrial Applications of Nimonic 90 Round Bars
- Turbine blades, discs, ring sections, and exhaust reheaters at 700–920°C.
- Forging dies, press tools, extrusion mandrels.
- Combustor springs, exhaust bellows, and retaining clips to 600°C with oxidation resistance to 920°C.
- Sour-service fasteners per NACE MR0175.
- Exhaust valves, turbocharger parts, and high-duty exhaust studs.
How to Order Nimonic 90 Round Bar
- Product Form (Round Bar, Rod, Hex, Flat, Forged)
- Diameter (mm or inch)
- Length (standard or cut-to-length)
- Condition (Solution Treated + Aged, or Solution Treated Only)
- Finish (Black, Bright, Centreless Ground)
- Standard (AMS 5829, BS HR2, BS HR501)
- Test Certs (EN 10204 3.1/3.2, PMI, UT)
- Sour Service Compliance (NACE MR0175 if applicable)
- Quantity (kg or pieces)
Frequently Asked Questions
What is the Difference between Nimonic 90 and 80A Bar?
Nimonic 90 contains 15-21% cobalt (vs 2% max in 80A), giving it a 920°C service ceiling vs 815°C for 80A. The cobalt makes Nimonic 90 unsuitable for nuclear applications due to Co⁶⁰ activation.
What is the Maximum Operating Temperature for Nimonic 90 Bar?
Under sustained creep loading, Nimonic 90 is rated to 920°C (1688°F). At 700°C, proof stress remains ~690 MPa. For oxidation-only service, higher temperatures are possible.
Can Nimonic 90 be Used for High-Temperature Springs?
Yes. One of the most widely specified alloys for springs to 600°C. High proof stress retention and fatigue resistance suit combustor springs and exhaust bellows.
What is the Cobalt Content in Nimonic 90 and Why Does It Matter?
What AMS Specification covers Nimonic 90 Bar?
AMS 5829 covers rod, bar, wire, and forgings. BS HR2, HR501, HR502, and HR503 also apply. MSRR 7137 / 7017 for aerospace procurement.