Inconel 725 Nickel Alloy Pipe（ASTM B805，UNS N07725）
Product Introduction
Alloy 725 is often referred to as the "king of stress corrosion cracking resistance" due to its special design for acidic oil and gas field environments. It also boasts advantages such as extremely high strength, excellent resistance to general corrosion, and strong process dependence (most importantly, a clearly defined heat treatment state), making it the ideal choice for customers in the oil and gas industry.
Our extensive sourcing experience has led us to offer Inconel 725 nickel alloy pipes in standard sizes with outside diameters ranging from 6mm to 1219mm and thicknesses from 0.5mm to 100mm. Our machining services allow you to choose the desired length. To address any concerns you may have regarding your first collaboration, our MOQ can be as low as 30kg for sample testing. As a result, we have gained a more diverse range of customers, contributing to the Lork Group's strength in the application of materials in the global oil and gas industry.
Procurement Specifications and Industry Standards
Based on our purchasing experience, a professional inquiry for Inconel 725 nickel alloy pipe can assist you in completing your initial procurement plan. It typically includes the following elements:
1. Material Standards:
Pipe Product Standards: ASTM B805 / ASME SB805 (These are the authoritative standards for pipes).
Material Grade: UNS N07725 or simply Inconel 725.
2. Specifications and Dimensions:
Outer Diameter (OD) and Tolerances (e.g., +/- 0.1mm).
Wall Thickness (WT) and Tolerances (e.g., +/- 10%).
Length (fixed length or random length). Specific Application (Working Conditions)
3. Delivery Condition:
Clearly specify: "Solution + Aging to 725 Condition", or simply "Aged to 725 Condition". This guarantees performance.
4. Special Requirements:
Non-destructive Testing: 100% eddy current testing (ET) or ultrasonic testing (UT), according to ASTM E426/E213 standards.
Surface Requirements: Polishing degree of inner and outer surfaces (e.g., Ra ≤ 0.8μm), presence or absence of oxide scale (usually requiring pickling and passivation).
End Treatment: Chamfering and protection required.
5. Marking and Packaging:
Permanent markings (e.g., stamped seals) and the material certificate type are required.
Our final comprehensive quote is based on the following driving factors:
Raw material: (nickel, molybdenum, etc.) futures prices are the foundation.
Specifications: Thin-walled, small-diameter tubes are more difficult to produce and have a higher unit price.
Condition: 725-aged tubes are significantly more expensive than annealed tubes (due to additional heat treatment and performance testing costs).
Purchase Quantity: This material is mostly produced in small batches on a project basis; large-scale purchases offer limited room for negotiation.
Depth of Processing: Services involving further processing naturally command higher prices.
Manufacturing Process and Challenges
Understanding the processing difficulties and key points is essential for comprehending supplier quotes and delivery dates, and also provides deeper technical support for subsequent processing and finished product manufacturing. Whether purchasing raw materials, machining simple parts, or precision-machined parts, the following points should be noted by skilled machining personnel regarding secondary processing:
Difficult to Machine: Inconel 725 nickel alloy pipe is a typical difficult-to-machine material, exhibiting severe work hardening and significant tool wear. This translates to high machining costs.
Heat Treatment is Critical: The temperature, time, and cooling rate of the aging heat treatment must be controlled with extreme precision. Even a temperature deviation of a few degrees Celsius can result in substandard performance.
Cold Working Prone to Cracking: Cold bending and expansion operations on alloy 725 in its high-strength state are highly susceptible to cracking, requiring extensive experience and rigorous process verification.
For more information, please contact:
Email: susan@lorkgroup.com
WhatsApp: +86 19937075488
Our Tip: If your parts have complex shapes, prioritize suppliers that offer a one-stop service of "pipe + heat treatment + deep processing" (Lork Group's comprehensive supply chain advantages can meet this need). This is more reliable and cost-effective than sourcing raw materials yourself and outsourcing processing.
Chemical Composition
(Typical value, check the range when verifying)
| Weight% | Alloy 725 |
| Ni | Bal |
| Cr | ~21% |
| Mo | ~8% |
| Nb+Ta | ~3.6% |
| Fe | ~10% |
Mechanical Properties
(Refer to ASTM B805/ASME SB805 standards, typical values at room temperature)
Status: 725 (solution + aging) - This is the most commonly used status in procurement.
| Material | (Annealed state) |
| Tensile Strength MPa | ≥1100 MPa |
| Yield Strength MPa | ≥760 MPa |
| Reduction of Area % | ≥20% |
| Hardness HRC | 30-38 |
Condition: Annealed (solution-treated) - Soft state, facilitating subsequent cold working.
Lower strength, good plasticity, but lacks the ultra-high strength and SCC resistance of the 725 temper.
Key procurement points: It is crucial to clarify whether you require "annealed condition" or "725 aging condition." The price, performance, and applications of the two are vastly different. The vast majority of downhole tools and critical components require a "725 condition."
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