Incoloy 825 (UNS N08825): Certified Supplier of Round Bars, Seamless Tubes & Plates

By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 Certified | 2026

Quick Answer: What Is Incoloy 825?

Incoloy 825 (UNS N08825 / W.Nr. 2.4858) is a nickel-iron-chromium alloy with significant additions of molybdenum, copper, and titanium. It is specifically designed to provide exceptional resistance to many corrosive environments, particularly those involving reducing and oxidizing acids, stress-corrosion cracking, and localized attack such as pitting and crevice corrosion. Its stabilized structure resists intergranular corrosion even after welding.

Product Overview

Incoloy 825 (UNS N08825) is a versatile nickel-base alloy belonging to the Incoloy series, developed to fill the gap between austenitic stainless steels and high-nickel alloys. Its chemistry is balanced to offer superior resistance to sulfuric and phosphoric acids. The molybdenum and copper content enhance resistance to reducing media, while the chromium content provides resistance to oxidizing conditions like nitric acid and nitrates.

Key properties include:

• Exceptional Resistance to Stress-Corrosion Cracking (SCC): The high nickel content makes it virtually immune to chloride-induced SCC.
• Superior Localized Corrosion Resistance: Effectively resists pitting and crevice corrosion in chloride environments.
• High-Temperature Stability: Maintains good mechanical properties from cryogenic temperatures up to approximately 540°C (1000°F).

Incoloy 825 is a critical material in industries such as Chemical Processing, Oil & Gas production, Acid Production, and Nuclear Fuel Reprocessing. Founded in 2012, Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified source supplier with a global distribution network across 32 countries, ensuring premium material supply and expert technical support.

Chemical Composition (ASTM B425, wt %)

All Incoloy 825 round bar supplied to ASTM B425, plate and sheet to ASTM B424, and seamless tube to ASTM B423 is produced within the following certified composition limits:

Executive Standards

Incoloy 825 is produced and certified according to major international standards to ensure consistency and reliability across global engineering projects.

Response time: within 10 minutes. Support for OEM/ODM. Reliable delivery to 32 countries.

Related Grades

• Inconel 625 (UNS N06625)
• Incoloy 800H (UNS N08810)
• Incoloy 925 (UNS N09925)
• Hastelloy C276 (UNS N10276)

Shanghai Hangbo Alloy Group Co., Ltd. — Your Trusted Partner in High-Performance Special Alloys.

Production Process

Our material is manufactured using VIM (Vacuum Induction Melting) + VAR (Vacuum Arc Remelting) or ESR (Electroslag Refining) processes to ensure ultra-high purity and metallurgical integrity. The material undergoes precision machining and rigorous heat treatment (Solution Annealing/Aging) to achieve the specified mechanical properties and grain size consistency.

Testing & Inspection

To guarantee zero-defect delivery, all batches undergo comprehensive testing:

• UT/PT Flaw Detection: Ultrasonic and Penetrant testing to identify surface and internal defects.
• Mechanical Testing: High and low temperature tensile testing, impact testing, and hardness verification.
• Corrosion Testing: Intergranular corrosion tests and pitting resistance verification according to ASTM standards.

Quality Control

We implement a total quality management system with full-process traceability from raw material to finished product. All products are manufactured in strict compliance with ASTM, ASME, and AMS standards, accompanied by EN 10204 3.1/3.2 certificates.

Market Pain Points & Solutions

• Delivery Consistency: We address supply chain delays by maintaining a large inventory of raw billets and semi-finished products, ensuring rapid response times.
• Extreme Environment Tolerance: Our specialized melting processes ensure that our alloys maintain structural stability in highly corrosive and high-pressure environments where standard materials fail.

Deep Application Insights

• Petrochemical: Used in flare stacks and flare tips where resistance to high temperatures and sour gas corrosion is critical.
• Nuclear Power: Applied in reactor core components and control rod mechanisms due to its excellent radiation resistance and mechanical stability.
• Aerospace: Found in engine exhaust systems and turbine shroud rings where high fatigue strength and oxidation resistance are required.

Product Forms & Standards Comparison

Acid Corrosion Resistance

Incoloy 825 is engineered for outstanding performance across a wide range of acid environments, which is why it is a preferred material for chemical process equipment:

• Sulfuric Acid: Excellent resistance to sulfuric acid over a broad range of concentrations and temperatures; widely used in acid production, storage tanks, heat exchangers and pickling systems.
• Phosphoric Acid: Superior performance in wet-process phosphoric acid production, including evaporator tubes and heat exchangers where conventional stainless steels suffer rapid attack.
• Nitric Acid: Good resistance to oxidizing media such as nitric acid and nitrate-containing environments, supported by its chromium content.
• Chloride Media: The high nickel content provides virtual immunity to chloride-induced stress-corrosion cracking, with good resistance to pitting and crevice corrosion in seawater and brine.
• Sour Environments (Oil & Gas): Resists sulfide stress cracking and corrosion in H2S/CO2-containing production environments.

In mixed acid and reducing/oxidizing conditions where duplex stainless steels or austenitic grades fail, Incoloy 825 delivers predictable, long-term corrosion performance with full traceability to mill test certificates.

Frequently Asked Questions (FAQ)

Q: What are the primary advantages of Incoloy 825 over stainless steel?
A: Incoloy 825 offers superior resistance to stress corrosion cracking, pitting, and crevice corrosion, especially in environments containing sulfuric or phosphoric acids.

Q: Can Incoloy 825 be used in high-temperature applications?
A: Yes, it is suitable for service up to approximately 540°C (1000°F). Beyond this, metallurgical changes may occur.

Q: Is Incoloy 825 weldable?
A: Yes, it has excellent weldability using common methods like GTAW (TIG) and GMAW (MIG).

Q: In what industries is Incoloy 825 most commonly used?
A: It is widely used in chemical processing, oil and gas production, acid production, and nuclear fuel reprocessing.

Q: Does Hangbo Alloy provide customized dimensions for Incoloy 825?
A: Yes, we provide precision machining and custom forgings in addition to standard products.