Inconel X-750 vs Nimonic 80A: Springs & Bolts
Date: 2026年9月10日 Categories: News Views: 397
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 Inconel X-750 and Nimonic 80A?
Inconel X-750 (UNS N07750) and Nimonic 80A (UNS N07080) are both age-hardenable nickel-chromium alloys used for springs, fasteners, and turbine components to about 700-800C. Their chemistry is close (both ~73% Ni, ~19% Cr, with Ti/Al for gamma-prime strengthening), but X-750 adds niobium (0.7-1.2%) for improved creep and stress-rupture, while Nimonic 80A is the classic European spring/turbine alloy with a slightly leaner chemistry. Both reach ~1200 MPa tensile when aged; X-750 is generally preferred for bolts and gas-turbine parts, Nimonic 80A for springs, valve stems, and European legacy designs.
Composition Comparison (wt.%)
| Element | Inconel X-750 (N07750) | Nimonic 80A (N07080) |
|---|---|---|
| Nickel | 70 min | Balance (~75%) |
| Chromium | 14-17 | 18-21 |
| Niobium | 0.7-1.2 | -- |
| Titanium | 2.25-2.75 | 1.8-2.7 |
| Aluminum | 0.4-1.0 | 1.0-1.8 |
| Iron | 5-9 | 3 max |
| Cobalt | 1 max | 2 max |
Mechanical Properties Comparison (Aged)
| Property | Inconel X-750 | Nimonic 80A |
|---|---|---|
| Tensile Strength | 1140-1270 MPa | 1100-1250 MPa |
| Yield Strength | 690-860 MPa | 700-880 MPa |
| Elongation | 15-25% | 20-30% |
| Hardness | 32-40 HRC | 30-38 HRC |
| Service limit | ~800C | ~815C |
High-Temperature / Relaxation Performance
| Condition | Inconel X-750 | Nimonic 80A |
|---|---|---|
| 650C / 1000h rupture | ~310 MPa | ~290 MPa |
| 700C / 1000h rupture | ~200 MPa | ~190 MPa |
| Stress relaxation (spring, 500C) | Good | Good |
| Oxidation resistance | Good | Good-Excellent |
Which One for Your Application?
| Application | Best Choice | Why |
|---|---|---|
| Gas turbine bolts | X-750 | Nb for creep + rupture |
| Spring wire (500-700C) | Nimonic 80A | Classic spring alloy |
| Valve stems | Nimonic 80A | European legacy designs |
| Nuclear reactor internals | X-750 | Nb + proven pedigree |
| Retaining rings | Nimonic 80A | High yield + formability |
| Exhaust bellows | X-750 | Thermal fatigue |
Price Comparison (2026, EXW)
| Form | Inconel X-750 | Nimonic 80A |
|---|---|---|
| Round Bar | \$40-62/kg | \$42-65/kg |
| Wire (spring) | \$48-72/kg | \$50-75/kg |
| Sheet/Plate | \$42-65/kg | \$44-68/kg |
Pricing is very close — selection is usually driven by drawing/spec requirements.
FAQ
Q1: Is Inconel X-750 better than Nimonic 80A?
For creep/rupture and fastener service, X-750's niobium gives a modest advantage. For springs and European legacy specs, Nimonic 80A is standard.
Q2: Which is stronger?
Both reach ~1200 MPa tensile when aged; differences are within scatter.
Q3: What are the UNS numbers?
N07750 = Inconel X-750; N07080 = Nimonic 80A.
Q4: What is the aging treatment for each?
X-750: 730C/8h + 620C/8h. Nimonic 80A: 700-750C/16h.
Q5: Can they be used above 800C?
Not for load-bearing service — strength falls sharply. Consider Nimonic 90/105 or Waspaloy.
Q6: Which is better for spring relaxation?
Both perform well; Nimonic 80A is the historical benchmark for spring wire.
Q7: What does Shanghai Hangbo supply?
Both grades in bars, wire, plates, and sheets with EN 10204 3.1 certification. SGS/TUV/BV 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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