Inconel 725 Nickel Alloy Strip
Product Introduction
Inconel 725 is not a general-purpose material; it's a "special forces" product designed to solve specific extreme problems. Its core value lies in its resistance to hydrogen sulfide stress corrosion cracking (SSC), chloride pitting, and crevice corrosion in acidic oil and gas fields. This is its biggest selling point. Therefore, it is often referred to as a corrosion-resistant ace material in the high-temperature alloy industry, specifically designed for harsh environments.
The Inconel 725 Nickel Alloy Strip we often talk about is a precipitation-hardening nickel-chromium-molybdenum-niobium alloy. Simply put, like steel, its strength can be significantly increased through a "quench-aging" heat treatment. We usually supply it in the solution-annealed state (softer and easier to machine). After you machine it into shape, you can perform an aging treatment, which can double or even increase its strength. Please get in touch with us for a technical specification sheet or a quote.
Procurement Specifications and Industry Standards
Based on the situations I mentioned above, or before purchasing, clarify with your engineer that the material to be purchased is Inconel 725 Nickel Alloy Strip and not other materials. We have had instances where unclear media and operating conditions led to purchasing errors, so please be aware of this.
The following points are key elements for effective communication in the procurement process, summarized by our Materials and Purchasing departments based on our experience purchasing the Inconel 725 Nickel Alloy Strip. We hope these points will help you advance your procurement process.
1. Product Form: Cold-rolled strip, typically delivered in coils or flat sheets.
2. Core Standard: ASTM B829 (General Specification for Nickel Alloy Strips and Sheets) is the general standard. Specific technical requirements often refer to AMS 5874 (Aerospace Materials Specification, with stricter requirements).
3. Grade Correspondence: US Standard: UNS N07725; Chinese Standard can be approximated by GH4725. Contracts must use "UNS N07725" to avoid confusion.
4. Key Specifications: Thickness (Lork commonly stocked: 0.08mm - 16.0mm), width (Lork commonly stocked: 5mm - 3000mm), length (determined by you), and tolerances (specified in production standard documents). It must be clearly stated whether it is coil (inner/outer diameter) or sheet material of fixed length.
5. Delivery Condition: Solution annealed. It must be confirmed that the heat treatment is carried out in a protective atmosphere (such as hydrogen) to ensure a bright, oxidation-free surface.
Manufacturing Process and Challenges
In most cases, the Inconel 725 Nickel Alloy Strip you purchase will be further processed into a finished product to suit your specific application. Whether purchasing raw materials, machining simple parts, or precision-machined parts, the following points should be noted by skilled machining personnel regarding secondary processing:
Forming: Although relatively soft in the solution-treated state, it is still harder than carbon steel. Stamping and bending require higher tonnage, and the dies wear quickly; it is recommended to use carbide dies.
Machining: Extremely difficult to cut. Superhard tools (such as CBN, ceramic-coated carbide) must be used, along with low speed, high feed, and sufficient coolant flushing to break chips.
Welding: Weldable, but matching high-strength welding materials (such as ERNiCrMo-3 or -4) must be used. Post-weld treatment usually requires a complete solution treatment and aging process to restore properties, which is costly. Welding should be avoided in design.
For more information, please contact:
Email: susan@lorkgroup.com
WhatsApp: +86 19937075488
Chemical Composition
(Focus on niobium and aluminum-titanium) When purchasing, pay attention to the Material Report (MTC). The key is not the nickel content, but the strengthening elements.
| Weight% | Inconel 725 |
| Ni | Bal |
| Cr | 19.0 - 22.5 |
| Mo | 7.0 - 9.5 |
| Fe | ≤ 15.0 |
| Nb | 2.75 - 4.00 |
| Ai | 0.35 max |
| Ti | 1.0 - 1.7 |
Key points: Niobium (Nb) is the core component for forming the strengthening phase, and its content must meet the standards. Aluminum (Al) and titanium (Ti) content are strictly controlled, affecting aging effects and hot working properties.
Mechanical Properties
Our experience tells us that "condition determines everything." Performance depends entirely on the condition of the strip, and you must clearly specify which condition of strip you want to buy when purchasing.
| Performance Specifications |
Solution Annealed State (Initial state of your purchase) |
Aged Hardened State (After heat treatment during processing) |
| Tensile strength (Rm) | ≥ 760 MPa | ≥ 1100 MPa |
| Yield strength (Rp0.2) | ≥ 345 MPa | ≥ 965 MPa |
| Elongation (A) | ≥ 35% | ≥ 20% |
| Hardness (HB) | ≤ 250 HB | ≥ 34 HRC (approx. ~321 HB) |
Procurement Note: You will typically be procuring solution-annealed strip for easy stamping and bending. Be sure to specify the condition in the contract and confirm that the heat treatment process we provide is controllable (e.g., compliant with AMS 2750 standards).
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