ZYTC Inconel® 725 (UNS N07725) Age-Hardenable Nickel Alloy When oil & gas downhole tools and sour gas applications demand ultra-high strength (double that of annealed 625) combined with superior corrosion resistance, material selection is critical. As an ISO 9001 and AS9120 certified supplier, ZYTC Alloy presents this technical guide for Inconel 725. I. Product InformationMaterial Name: Inconel® 725 Age-Hardenable Nickel-Chromium-Molybdenum Alloy (UNS N07725) Definition: An advanced nickel-based superalloy strengthened through precise heat treatment, achieving yield strength approximately double that of annealed Alloy 625. Enables uniform strength in large/complex sections where cold working is ineffective. Core Value: Ultra-high strength + superior corrosion resistance for sour gas service and aggressive environments. Certification: ISO 9001 & AS9120 Product Forms: Bar | Round Bar | Flat Bar | Forging Stock | Custom Components
Chemical Composition (wt%): | Element | Ni | Cr | Mo | Nb | Ti | Fe |
|---|
| Min | 55.0 | 19.0 | 7.0 | 2.75 | 1.0 | * | | Max | 59.0 | 22.5 | 9.5 | 4.0 | 1.7 | 9.0* |
Fe 9% max. Al 0.35% max, Mn 0.35% max, Si 0.20% max, C 0.030% max, P 0.015% max, S 0.010% max. II. Service Conditions & Selection BoundariesSuitable Conditions (Why choose it?) Sour Gas Service (H₂S): Excellent resistance to sulfide stress cracking per NACE MR0175. Downhole Tools: High-strength components in deep, high-pressure wells. Marine Environments: Subsea components requiring strength + corrosion resistance. Complex Sections: Where cold working cannot achieve uniform strength.
Typical Applications: Oil & Gas Downhole: Hangers, landing nipples, side pocket mandrels, polished bore receptacles Sour Service: Critical components in H₂S environments Marine: High-strength fasteners, subsea hardware Industrial: Polymer extrusion dies
Material Selection Boundaries: Need higher temperature >500°C? → Consider Inconel 718 or 725 (check limits) Need maximum corrosion resistance? → Consider Inconel 625 or 686 Need weldability without post-heat treat? → Consider Inconel 625 Cost-sensitive applications? → Consider 17-4 PH or 316 SS (if conditions permit)
III. Manufacturing Process & Material ComparisonCritical Heat Treatment: | Stage | Temperature | Cooling | Purpose |
|---|
| Solution | 1040°C (1900°F) | Air cool | Dissolves elements; soft/workable condition | | Age Hardening | 730°C (1350°F)/8h → furnace cool 56°C/h → 620°C (1150°F)/8h | Air cool | Precipitates strengthening phases for double strength |
Fabrication Guidelines: Hot Working: 900-1120°C (1650-2050°F). Final reductions: 20% min (open-die), 10% min (closed-die) to avoid duplex grain structure. Machining (Group D-2 - Very Difficult): Rough machine in solution-annealed (softer) condition Finish machine after aging (harder condition) Allow 0.07% shrinkage during aging for final dimensions
Mechanical Properties (Annealed): | Property | Value |
|---|
| Tensile Strength | 855 MPa (124 ksi) | | Yield Strength | 427 MPa (62 ksi) | | Elongation | 57% | | Hardness | 5 HRC |
Aged condition achieves approximately double the yield strength of annealed condition. Material Comparison Guide: | Alloy | Primary Strength | Yield Strength (Aged) | Corrosion | Form | Weldability |
|---|
| 725 | Strength + Corrosion | ~850 MPa | Excellent | Wrought | Good (requires PWHT) | | 625 | Corrosion Resistance | 414 MPa (annealed) | Excellent | All | Excellent | | 718 | Max Strength | ~1100 MPa | Good | All | Excellent | | 722 | Strength + Corrosion | ~1035 MPa | Excellent | Wrought | Good (requires PWHT) | | C-276 | Max Corrosion | ~350 MPa | Superior | All | Excellent |
Request a Quote Today:For oil & gas downhole tools, sour service components, or marine applications demanding alloy 725's ultra-high strength and corrosion resistance, contact ZYTC Alloy. Contact us for certified materials, technical support, and competitive quotes. Contact Us:Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 | 
