Nimonic 90 vs Nimonic 75 - Full Comparison of Composition, Strength & Creep | Shanghai Hangbo Alloy Group
Date: 2026年8月18日 Categories: News Views: 221
By Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier | ISO 9001:2015 | Est. 2012
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp (Lisa): +86 13611656360
Quick Answer: What Is the Difference Between Nimonic 90 and Nimonic 75?
Nimonic 90 (UNS N07090) and Nimonic 75 (UNS N06075) are both nickel-chromium alloys, but they serve fundamentally different roles. Nimonic 90 is a precipitation-hardening alloy — it is aged at 700C to reach 1,000+ MPa tensile strength for turbine blades, springs, and fasteners operating to 920C. Nimonic 75 is a solid-solution alloy — softer (550-750 MPa) but highly formable, weldable, and oxidation-resistant to 1000C, used for furnace hardware, sheathing, and heat-treatment fixtures. In short: choose 90 for load-bearing high-temperature components; choose 75 for oxidation-resistant, formable parts.
Composition Comparison (wt.%)
| Element | Nimonic 90 | Nimonic 75 |
|---|---|---|
| Nickel | Balance (~57%) | Balance (~76%) |
| Chromium | 18-21 | 18-21 |
| Cobalt | 15-21 | -- |
| Titanium | 2.0-3.0 | 0.2-0.6 |
| Aluminum | 0.8-2.0 | -- |
| Iron | 5 max | 5 max |
| Carbon | 0.13 max | 0.08-0.15 |
Key difference: Nimonic 90's cobalt (15-21%) + titanium + aluminum enable γ′ precipitation hardening. Nimonic 75 has none — it relies on chromium for oxidation resistance.
Mechanical Properties Comparison
| Property (RT) | Nimonic 90 (Aged) | Nimonic 75 (Annealed) |
|---|---|---|
| Tensile Strength | 1000-1300 MPa | 550-750 MPa |
| Yield Strength | 650-900 MPa | 250-350 MPa |
| Elongation | 20-30% | 40-50% |
| Hardness | 30-40 HRC | 80-90 HRB |
High-Temperature Performance
| Temperature | Nimonic 90 (10,000h creep, MPa) | Nimonic 75 (oxidation focus) |
|---|---|---|
| 700C | ~200 | Not creep-rated |
| 800C | ~100 | Excellent oxidation |
| 900C | ~40 | Good oxidation |
| 1000C | Not suitable | Good oxidation |
Heat Treatment Comparison
| Step | Nimonic 90 | Nimonic 75 |
|---|---|---|
| Solution | 1080C / 8h / AC | 1050-1100C / AC |
| Age | 700C / 16h / AC | Not required |
Nimonic 75 requires NO aging — it is used in the annealed condition.
Application Comparison
| Application | Best Choice | Why |
|---|---|---|
| Turbine blades | Nimonic 90 | Needs creep + strength |
| High-temp springs | Nimonic 90 | Needs relaxation resistance |
| Furnace muffles/retorts | Nimonic 75 | Formable, oxidation-resistant |
| Thermocouple sheaths | Nimonic 75 | Stable, easy to form |
| Heat-treat fixtures | Nimonic 75 | Cost-effective |
| Fasteners (700C+) | Nimonic 90 | Needs strength |
Price Comparison (2026, EXW)
| Form | Nimonic 90 | Nimonic 75 |
|---|---|---|
| Round Bar | \$55-90/kg | \$35-55/kg |
| Sheet/Plate | \$60-95/kg | \$38-58/kg |
| Wire | \$65-100/kg | \$40-60/kg |
Cost driver: Nimonic 90's 15-21% cobalt accounts for the premium.
FAQ
Q1: Is Nimonic 90 better than Nimonic 75?
Not universally. 90 is stronger and creep-resistant (better for blades/springs); 75 is more formable, weldable, and cheaper (better for furnace hardware). Match to the application.
Q2: Can Nimonic 75 be precipitation hardened?
No. It is solid-solution strengthened only.
Q3: What is UNS N07090?
UNS N07090 is the unified designation for Nimonic 90. UNS N06075 is Nimonic 75.
Q4: Which is better for 900C service?
For oxidation resistance, both work. For load-bearing at 900C, neither is ideal — consider Nimonic 105 or Haynes 230.
Q5: What does Shanghai Hangbo supply?
Both Nimonic 90 and 75 in bars, plates, sheets, and wire with EN 10204 3.1 certification. SGS/TUV/BV inspection available.
Contact & Complete Product Range
Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier
Email: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
All Grades
Ni: NI200-N6 | Monel: 400-502, K-500, R-405 | Inconel: 600-740H, X-750, 725 | Incoloy: 800-27-7MO | Hastelloy: C-276-HYBRID-BC1, N | Super Austenitic: 904L-AL-6XN | Chromium-Rich: Alloy 33 | High-Strength Stainless: Nitronic 50/60, PH13-8Mo | Chlorination: Alloy 45 | Nimonic: 75-263 | Haynes: 25-HR-160 | RA: 330/333 | Precision: 1J22-4J45 | High-Strength: 18Ni250-AerMet100 | Heating: Cr20Ni80/60 | Specialty: Alloy 20-602CA
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