ASME SB443 Inconel 625 Grade 2 Sheet 0.5-30mm W.Nr 2.4856 N06625 Nickel Alloy Plate

Inconel 625    is a high-performance nickel-chromium-molybdenum-niobium alloy (UNS N06625) chosen when corrosion resistance, high strength without precipitation hardening, and stability at elevated temperatures are required; for shafts, fasteners, valve components, and structural parts in aerospace, marine, chemical and oil-and-gas equipment, the round-bar form delivers machinability and predictable mechanical behaviour while meeting rod-and-bar specifications such as ASTM B446 and AMS 5666.

1. What Inconel 625  is and why engineers choose it

Inconel 625 is a nickel-based superalloy engineered for a balance of elevated strength and exceptional resistance to a wide spectrum of corrosive media. In round bar form, the alloy is supplied as hot- or cold-worked rod and bar stock that is suitable for turning, drilling, boring, and producing precision shafts, fasteners, and machined components. The alloy achieves high strength mainly through solid-solution hardening by molybdenum and niobium rather than through age-hardening, which means the stock does not require complex precipitation heat-treatment cycles to achieve its principal mechanical properties. This behaviour reduces process complexity for manufacturers who convert bar stock into finished components.

2. Chemical composition and metallurgical basis of properties

Key composition (typical ranges)

The performance of alloy 625 stems from its deliberate chemistry. Typical mass-percent ranges commonly specified for UNS N06625 are:

(Values above are representative of published data sheets and standard specifications for Alloy 625. Exact composition limits are defined in material specifications and purchase documents.)

Metallurgical role of principal elements

• Nickel forms the austenitic matrix and provides base ductility and corrosion resistance.

• Chromium contributes oxidation and general corrosion resistance.

• Molybdenum enhances resistance to pitting and contributes to solid-solution strengthening.

• Niobium (columbium) combines with carbon and other solutes to stabilize the matrix, increases high-temperature strength, and helps suppress carbide precipitation that would embrittle the alloy.

• Minor additions (Ti, Al, Co) fine-tune phase stability and mechanical behaviour.

Because the alloy obtains most of its strength from these solid-solution mechanisms rather than from a martensitic or precipitation-hardening transformation, Inconel 625 remains stable across a wide temperature window and retains toughness after fabrication steps such as cold drawing or machining.

3. Mechanical properties and temperature limitations

Typical mechanical properties (annealed condition)

Properties depend on temper and source; below are representative values for annealed bar stock often encountered in supplier data sheets:

Note: Smaller-diameter, cold-worked rod often shows higher yield and tensile strengths than larger- diameter, fully annealed bar. Refer to supplier mill certificates for exact values per lot.

High-temperature behaviour and upper service limit

Alloy 625 maintains useful mechanical integrity from cryogenic temperatures up to near 980°C (approx 1800°F) depending on environment; continuous use temperatures are commonly specified to roughly 982°C for some service conditions, but creep and long-term strength diminish with time and temperature. For creep-critical components designers consult long-time elevated-temperature data and perform engineering life calculations.

Stress-rupture and fatigue

• Stress-rupture strength: The alloy exhibits good rupture life at intermediate high temperatures because of the solid-solution strengthening by Mo and Nb.

• Fatigue resistance: Inconel 625 has superior fatigue endurance in many corrosive and high-temperature conditions compared with stainless steels, which explains its use in turbine, marine, and chemical plants.

For design-critical components, use supplier-provided fatigue and creep curves and follow relevant codes (ASME, NACE) for life prediction and safety factors.

4. Standard sizes, specifications, and traceability

Common specifications for round bar

• UNS designation: UNS N06625 (identifies the chemical family and general properties).

• ASTM / ASME: ASTM B446 covers nickel alloy bar and rod (including 625) in hot-worked and cold-worked forms; ASME SB-446 is the corresponding code reference.

• Aerospace / AMS: AMS 5666 and related AMS documents are often used where aerospace-level material source control and heat-treatment sequences are required.

Typical diameters and lengths

Manufacturers supply round bars in a range of standard diameters from small-diameter cold-drawn rod (5 mm and up) to large rough-turned bars (up to several inches, e.g., 4.25 in or more). Standard mill lengths commonly fall between 120 and 168 inches for many stock items, with cut-to-length options available from distributors. The supply condition (annealed, rough-turned, cold-drawn) is specified on purchase orders. Example supplier catalog entries show 3.5 in, 4.25 in diameters and lengths of 120–168 in for typical inventory items.

Traceability and mill test reports

Buyers should request a mill test report (MTR / material certificate) that shows chemical analysis, mechanical test results, heat number, heat-treatment condition, and conformity to ordered specification (e.g., ASTM B446, AMS 5666). For critical applications (aerospace, nuclear) full lot traceability and non-destructive testing documentation may be required.

Inconel Sales Company - Frequently Asked Questions (FAQ)

1. How do I choose the right Inconel material for my needs?

When selecting Inconel materials, consider the following factors:

• Operating Environment: Including temperature, corrosive media, oxidation conditions, etc.
• Corrosion Resistance: Different Inconel alloys have varying resistance to different types of corrosion (acidic, chlorides, oxidation, etc.).
• Mechanical Properties: Including tensile strength, hardness, etc., depending on the specific workload of the application.

If you're unsure about which alloy to choose, our technical support team can assist you with professional recommendations based on your requirements.

2. What specifications are available for your Inconel products?

We offer a wide range of Inconel products, including plates, pipes, bars, wires, and customized products. Specifications include various thicknesses, diameters, lengths, etc., to meet diverse customer needs.

3. What is the delivery time for Inconel products?

For standard stock items, the delivery time is typically 3-7 working days. For customized or specially processed products, delivery time may vary and is generally 2-4 weeks. Specific delivery times can be confirmed based on order quantities and production schedules.

4. How do you guarantee the quality of your Inconel products?

All of our Inconel products are sourced from reliable manufacturers and strictly adhere to international quality standards. Each batch of materials comes with detailed quality inspection reports and material certificates to ensure that the products meet performance and quality standards.

5. Do you offer technical support and consulting services?

Yes, we provide free technical support services. Our engineering team can assist with material selection, processing techniques, performance testing, and more. Whether it's product selection or engineering design, we can provide professional consulting services.

6. 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.

7. 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.

8. 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.

9. Do you offer returns or exchanges?

Due to the customized or specialty nature of Inconel 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.

10. 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

11. Do you offer processing or customization services?

Yes, we provide customized processing services for Inconel 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.

12. How can I contact you for more information?

You can contact us through the following methods:

Online support: Visit our website for live chat

Address: 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!