Inconel 725 Nickel Alloy Plate
Product Introduction
Inconel 725 is specifically designed for acidic oil and gas fields and marine engineering applications containing H₂S, CO₂, and chlorides. It boasts ultra-high strength and top-tier corrosion resistance, especially excellent resistance to stress corrosion cracking (SCC). It is ideal for the most demanding applications requiring both high strength and corrosion resistance.
The common standards for the Inconel 725 nickel alloy sheets we supply are bars: ASTM B564, AMS 5924; hot-rolled bars/tubes: ASTM B865/B805. Of course, we also offer other forms, such as alloy 725 sheets, tubes, strips (coils), and wires, which can be customized to meet specific requirements. Please get in touch with us for a technical specification sheet or a quote.
Practical Guide to Market Procurement
1. Supplier Selection: This is half the battle in successful procurement. It is essential to select a professional manufacturer or top-tier distributor with the capability of dual-process manufacturing of vacuum induction melting (VIM) and electroslag remelting (ESR)/vacuum arc remelting (VAR). Their track record in high-performance nickel-based alloys (such as 718 and 625) should be carefully examined.
2. Key Aspects of Inquiry and Contract: When inquiring about prices, do not simply ask "How much is a 725 plate?" You must provide:
The Inconel 725 grade and standard, precise specifications, heat treatment state (e.g., solution treatment + aging), quantity, delivery date, and required testing reports (e.g., MTC + third-party UT reports).
3. Cost and Delivery Considerations: Due to the high cost of the alloy and the complexity of the process, the price is very high, and the production cycle can last for several months. Low-price traps carry a high risk and may correspond to non-standard compositions, simplified heat treatment, or impure smelting materials.
4. Consultation on domestic alternatives: For non-extreme operating conditions, you can consult with suppliers to see if there are domestic brands with similar performance and better cost available for evaluation.
Manufacturing Process and Challenges
Inconel 725 is a typical "difficult-to-machine material", which directly affects your processing costs and yield. Whether purchasing raw materials, machining simple parts, or precision-machined parts, the following points should be noted by skilled machining personnel regarding secondary processing:
Hot Working: Forging and rolling have narrow temperature ranges (e.g., 1050-1170°C) and require strict control; otherwise, cracking is likely.
Welding: Welding is possible, but matching welding materials (e.g., ERNiCrMo-3 or ERNiCrMo-15) must be used, along with low heat input techniques. Critical components must undergo a complete solution treatment and aging process after welding to restore the corrosion resistance and SCC resistance of the heat-affected zone.
Machining: Its high strength, low thermal conductivity, and work-hardening tendency result in high cutting forces, high cutting temperatures, and very rapid tool wear. High-end carbide or ceramic tools must be used, employing a strategy of low speed, high feed rate, and adequate cooling.
For more information, please contact:
Email: susan@lorkgroup.com
WhatsApp: +86 19937075488
Chemical Composition
| Weight% | Inconel 725 |
| Ni | 55-59% |
| Cr | 19-22.5% |
| Mo | 7-9.5% |
| Nb | 2.75-4.0% |
| C | ≤0.03% |
Mechanical Properties
| Material | (Typical values after aging treatment) |
| Tensile Strength MPa | 1100 - 1300 |
| Yield Strength MPa | 900 - 1100 |
| Reduction of Area % | 20-30% |
| Hardness HRC | 35 |
In addition, the alloy has a density of long-term operating temperature: up to approximately 650°C.
Key Points of Quality Inspection Process
To ensure the material quality of Inconel 725 nickel alloy plate, a complete third-party testing report should be requested from the supplier during procurement. Lork Inspection Laboratory's comprehensive testing program lists the following four key testing items:
1. Document Review: Suppliers are required to provide complete material certificates, which must include: furnace number, chemical composition, aged mechanical properties, heat treatment records, and non-destructive testing report.
2. Third-Party Verification: After production, third-party testing (such as SGS) is commissioned to conduct the following verifications:
Chemical Composition Verification: Spectroscopic analysis.
Mechanical Property Retesting: Tensile and hardness tests.
Non-Destructive Testing: Ultrasonic testing (UT) of plates and important blanks to check for internal defects.
Metallographic Inspection: Checking grain size and microstructure.
3. Specialized Corrosion Testing: For critical applications, assessments for pitting corrosion, crevice corrosion, or stress corrosion cracking may be required according to methods such as ASTM G48.
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