NC22DNb (Inconel 625) is a nickel-based superalloy known for its exceptional corrosion resistance, high strength, and superior thermal stability in extreme environments. It is widely used in aerospace, marine, chemical processing, and power generation industries due to its ability to withstand high temperatures (up to 1000°C) and aggressive chemical environments.
Specifications:
Parameter | Details |
---|---|
Alloy Name | NC22DNb / Inconel 625 |
UNS Number | N06625 |
W.Nr. | 2.4856 |
Material Type | High-Temperature Nickel-Based Superalloy |
Product Form | Round Pipe / Tube (Seamless & Welded) |
Standards | ASTM B444, ASTM B705, AMS 5581, DIN 17751 |
Outer Diameter (OD) | 6 mm - 500 mm (customizable) |
Wall Thickness | 0.5 mm - 50 mm (customizable) |
Length | Up to 12 meters (custom lengths available) |
Surface Finish | Annealed, Pickled, Polished |
Density | 8.44 g/cm³ |
Melting Point | 1290-1350°C |
Tensile Strength | ≥ 827 MPa |
Yield Strength | ≥ 414 MPa |
Elongation | ≥ 30% |
Corrosion Resistance | Outstanding in oxidizing & reducing environments, seawater, acids |
Weldability | Excellent (supports GTAW, GMAW, SMAW) |
Key Features of NC22DNb / Inconel 625 Pipes & Tubes:
Superior Corrosion Resistance:
- Exceptional resistance to oxidation, pitting, crevice corrosion, and chloride stress corrosion cracking (SCC).
- Performs well in acidic, marine, and high-salinity environments (resistant to HCl, HSO, and seawater).
High-Temperature Strength & Thermal Stability:
- Maintains high mechanical strength up to 1000°C (1832°F).
- Ideal for extreme heat applications in gas turbines, reactors, and heat exchangers.
Excellent Weldability & Fabricability:
- Can be easily welded using TIG (GTAW), MIG (GMAW), and SMAW welding methods.
- No need for post-weld heat treatment, making it cost-effective and easy to manufacture.
Fatigue & Creep Resistance:
- Withstands high mechanical stress, cyclic loading, and creep deformation over long periods.
Common Applications:
Aerospace Industry:
- Jet engine exhaust systems, heat shields, and afterburners.
- Turbine blades, combustion chambers, and structural components.
Marine & Offshore Applications:
- Seawater piping systems, heat exchangers, and marine risers.
- Offshore oil & gas platforms, subsea equipment, and ship exhaust systems.
Chemical & Petrochemical Industry:
- Acid processing plants, heat exchangers, and distillation columns.
- Used in HSO, HCl, HNO, and phosphoric acid environments.
Power Generation & Nuclear Industry:
- Heat recovery steam generators (HRSG), nuclear reactors, and superheaters.
- High-pressure piping in steam and gas turbines.



1. What are high-temperature alloy pipes?
High-temperature alloy pipes are specialized pipes made from materials designed to withstand extreme temperatures, pressure, and corrosion. These alloys typically contain nickel, chromium, iron, and other elements that enhance their mechanical properties and durability in high-temperature environments.
2. What are the common types of high-temperature alloy pipes?
Common types include:
Inconel (e.g., Inconel 600, 625, 718, 925)
Hastelloy (e.g., Hastelloy C-22, C-276)
Monel (e.g., Monel 400, K500)
Stainless steel alloys (e.g., 310S, 321, 347)
Other superalloys designed for extreme conditions
3. What industries use high-temperature alloy pipes?
Industries that commonly use these pipes include:
Aerospace
Power generation (nuclear, fossil, and renewable energy plants)
Petrochemical and chemical processing
Oil and gas
Automotive and transportation
Marine and offshore engineering
4. What are the key properties of high-temperature alloy pipes?
High oxidation and corrosion resistance
Excellent mechanical strength at elevated temperatures
Good thermal stability
Resistance to creep and stress rupture
Weldability and formability
5. How are high-temperature alloy pipes manufactured?
These pipes are typically produced through processes such as:
Seamless extrusion
Welded pipe production
Cold drawing
Hot rolling
Precision machining and heat treatment
6. What standards apply to high-temperature alloy pipes?
Some widely recognized standards include:
ASTM B167, B407, B983 (for Inconel alloys)
ASTM B619, B622 (for Hastelloy alloys)
ASTM A312, A213 (for stainless steel alloys)
ASME, ANSI, and API standards for specific industrial applications
7. How do I choose the right high-temperature alloy pipe for my application?
Factors to consider include:
Operating temperature and pressure
Corrosive environment (acidic, alkaline, seawater, etc.)
Mechanical strength requirements
Compliance with industry standards and regulations
Cost and availability
8. How can I get a quote?
You can request a quote through the following methods:
- Submit a quote request form on our website
- Call our sales hotline
- Contact us via email Please provide details such as the alloy type, specifications, quantity, and delivery location to receive an accurate quote.
9. Do you support international shipping?
Yes, we offer worldwide shipping. Our experienced logistics team can assist with various international shipping issues, including transportation options, customs handling, and destination requirements.
10. What payment methods do you accept?
We accept various payment methods, including bank transfers, credit card payments, PayPal, and more. The specific payment method can be confirmed based on the order amount and customer preferences.
11. Do you offer returns or exchanges?
Due to the customized or specialty nature of Hastelloy materials, our return and exchange policy is strict. Standard stock products can be returned or exchanged if they are unused and unprocessed. Please confirm the return/exchange conditions and process with our sales team before placing an order.
12. What certifications or documentation do you provide?
We can provide the following certifications and documents:
- Material inspection reports
- Material certificates
- Compliance certificates (e.g., ISO 9001 certification)
- Other certification documents as required by the customer
13. Do you offer processing or customization services?
Yes, we provide customized processing services for Hastelloy alloys, including cutting, welding, precision machining, and more. Whether it's standard dimensions or special requirements, we can process the materials to meet your needs.
14. How can I contact you for more information?
You can contact us through the following methods:
Online support: Visit our website for live chatAddress: 300 Meters North of Liaoniu Road and Xindong Ring Road, Liaocheng High-Tech Zone, Liaocheng, Shandong, China
We look forward to providing you with high-quality products and services!
If you have any other questions, feel free to contact us, and we will do our best to assist you!