High-temperature and sour-service nickel-chromium alloys — see the grade table below for full datasheets and equivalents within this family.
See All Grades ↓Inconel is a family of nickel-chromium alloys built for high-temperature strength retention and resistance to oxidizing and sour environments beyond what stainless and duplex steels can provide. It spans a wide range within the family — from the general-purpose 600, through the molybdenum-bearing 625 for the highest temperature and sour service, to the precipitation-hardened 718 for applications needing exceptional strength.
Choosing within the family starts with the actual driver: general high-temperature/caustic resistance (600), high-temperature plus sour or chloride resistance (625), or a genuine structural strength requirement (718).
| Grade | Designation | Best For |
|---|---|---|
| Inconel 600 | UNS N06600 | General high-temperature and caustic service |
| Inconel 625 | UNS N06625 | ~980°C oxidation resistance, sour (H₂S) service |
| Inconel 718 | UNS N07718 | Precipitation-hardened, exceptional strength-to-weight |
600 for general high-temperature/caustic service, 625 if sour gas or chloride resistance at high temperature is required, and 718 only if there's a genuine structural strength driver beyond standard pressure design.
No — 718's primary advantage is strength via precipitation hardening, not superior corrosion resistance. For corrosion-driven applications, 625 is usually the more appropriate and cost-effective choice.
It varies by grade — 625 handles oxidation resistance to roughly 980°C, though the practical pressure-part design temperature is governed by allowable stress at temperature, not oxidation limits alone.
Every enquiry is checked against governing code, material compatibility and manufacturing feasibility before a quote is issued. Use our product, material, grade and standards guides to freeze the RFQ — then confirm with engineering.
Send your fluid composition and temperature — our engineering team will confirm the right grade.
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