Nimonic 90 vs Nimonic 75: Strength & Creep
Date: 2026年8月18日 Categories: News Views: 351
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 | 1.0-2.0 | -- |
| Iron | 1.5 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 | 1100-1300 MPa | 550-750 MPa |
| Yield Strength | 750-950 MPa | 250-350 MPa |
| Elongation | 15-25% | 40-50% |
| Hardness | 250-350 HB | 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
Related Products & Where to Buy
For Nimonic 90 (UNS N07090) round bars and forgings and Nimonic 75 (UNS N06075) round bars, tubes and plates, visit the product pages or contact Shanghai Hangbo Alloy Group for certified material.
Product Forms: Bars(6-500mm) | Tubes(OD 6-610mm) | Plates(0.1-100mm) | Forgings | Welded Pipes | Fittings | Wire(0.05-10mm) | Strip(0.02-4.0mm)
SGS/BV/TUV. www.nickel-alloy.com
