Incoloy 925 vs Inconel 718: Downhole Service
Date: 2026年9月15日 Categories: News Views: 343
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 Incoloy 925 and Inconel 718?
Incoloy 925 (UNS N09925) and Inconel 718 (UNS N07718) are both age-hardenable nickel alloys used for oilfield components, but they trade strength for corrosion resistance differently. 925 is an iron-nickel-chromium alloy with molybdenum, copper, and titanium — it reaches ~965 MPa yield and offers excellent resistance to sour gas (H2S) and CO2, making it a favorite for downhole tubulars and wellhead components. 718 delivers far higher strength (~1030-1200 MPa yield) and is used for high-pressure valves and hangers, but its lower corrosion allowance in severe sour service must be evaluated. Rule: severe sour service → 925; maximum strength → 718.
Composition Comparison (wt.%)
| Element | Incoloy 925 (N09925) | Inconel 718 (N07718) |
|---|---|---|
| Nickel | 42-46 | 50-55 |
| Chromium | 19.5-22.5 | 17-21 |
| Iron | Balance (~28%) | Balance (~18%) |
| Molybdenum | 2.5-3.5 | 2.8-3.3 |
| Copper | 1.5-3.0 | -- |
| Titanium | 1.9-2.4 | 0.65-1.15 |
| Niobium | -- | 4.75-5.50 |
Mechanical Properties Comparison (Aged)
| Property | Incoloy 925 | Inconel 718 |
|---|---|---|
| Tensile Strength | 965-1140 MPa | 1240-1450 MPa |
| Yield Strength | 690-830 MPa | 1030-1200 MPa |
| Elongation | 20-30% | 12-18% |
| Hardness | 28-38 HRC | 33-46 HRC |
Corrosion Performance Comparison
| Environment | Incoloy 925 | Inconel 718 | Better |
|---|---|---|---|
| Sour gas (H2S + CO2) | Excellent | Good | 925 |
| CO2 corrosion | Excellent | Good | 925 |
| Chloride SCC | Excellent | Good | 925 |
| Seawater | Excellent | Good | 925 |
| Strength at 200C | Good | Excellent | 718 |
Which One for Your Application?
| Application | Best Choice | Why |
|---|---|---|
| Downhole tubing (sour) | 925 | H2S/CO2 resistance |
| Wellhead components | 925 | Corrosion + NACE |
| High-pressure valves | 718 | Maximum strength |
| Tubing hangers | 718 | Strength + fatigue |
| Subsea fasteners | 925 | Corrosion resistance |
| Gas lift mandrels | 925 | Sour service |
Price Comparison (2026, EXW)
| Form | Incoloy 925 | Inconel 718 |
|---|---|---|
| Round Bar | \$32-52/kg | \$38-60/kg |
| Tube | \$40-62/kg | \$48-75/kg |
| Forgings | \$45-70/kg | \$52-80/kg |
718 is typically 15-25% more expensive and requires tighter processing controls.
FAQ
Q1: Is Incoloy 925 better than Inconel 718?
For sour gas and CO2 service, yes. For maximum strength and high-pressure components, 718 wins.
Q2: What are the UNS numbers?
N09925 = Incoloy 925; N07718 = Inconel 718.
Q3: Are both NACE compliant?
Both can be supplied to NACE MR0175/ISO 15156 for sour service; hardness limits must be respected.
Q4: Which is stronger?
718, with up to 1200 MPa yield versus ~830 MPa for 925.
Q5: Which is more resistant to H2S?
925 — its copper and molybdenum content improves sour service performance.
Q6: Which for subsea fasteners?
925 for corrosion-driven designs; 718 where strength governs.
Q7: What does Shanghai Hangbo supply?
Both grades in bars, tubes, and forgings 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
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)
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