Incoloy 825 pipe, also known as nickel alloy 825, is a tubular product of the nickel-iron-chromium alloy. It is one of the grades of Incoloy seamless pipes, known for its excellent performance in various corrosive environments.
ASTM B423 Incoloy 825 Seamless Pipe Manufacturer in China
We, Zhejiang Xintongda Special Steel (XTD), are a leading supplier and manufacturer of incoloy 825 seamless pipes. Incoloy 825 seamless pipe, also known as Nicrofer 4221, is a tubular product made from an alloy of nickel, iron, and chromium. Incoloy 825 pipe has around 38-46% nickel, 19.5-23.5% chromium, a balanced amount of iron, and the remainder of many other elements. Manufactured under ASTM B423 standard, this UNS N08825 pipe is known for its high resistance to corrosion in aggressive chemical, marine, and high-temperature environments. The molybdenum, copper, and titanium present in this alloy make it super resistant to pitting, crevice corrosion, and stress corrosion cracking. These properties make Nicrofer 4221 useful for applications exposed to harsh acids and corrosive environments.
Due to our 4 decades of experience and ISO9001, ISO14001, and ISO45001 certifications, customers across China and the globe rely on us for their needs. We have an annual supply capacity of around 25,000 tons with around 1 week of delivery time for in-stock orders and 15-60 days for large production orders.
The nickel alloy 825 seamless pipe has the following product specifications:
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Standard
ASTM B423
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OD Range
6-457 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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Technical Data
Technical Data
Manufacturing Process of Alloy 825 Pipe
To manufacture nickel alloy metal pipes 825, we first take a round bar of this alloy and pierce it to form a hollow shell. Then the bar is peeled, ground, centred, heated, and pickled. After that, it goes through cold drawing, heat treatment, straightening, and cutting. The last step is to pickle again and send it for inspection. If you want to learn the whole process, kindly check out this page.
What are the Key Features of Incoloy 825 Pipe?
There are 5 main characteristics of nickel alloy 825 seamless pipe, like corrosion resistance, service temperature, heat treatment, mechanical properties, and workability.
- Corrosion Resistance: The alloy’s molybdenum, copper, and titanium contents help it resist strong oxidising acids like sulfuric and phosphoric. It also has great resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC).
- Service Temperature: Nickel alloy 825 can maintain its strength and corrosion resistance even in elevated temperatures (up to 540°C).
- Heat Treatment: 825 seamless pipe goes through heat treatments like solution annealing, which increases its corrosion resistance.
- Mechanical Properties: The 2.4858 seamless pipe’s mechanical properties, like high yield strength, exceptional tensile strength, and hardness, make it stand out.
- Workability: The 825 pipe has good ductility, which increases its weldability.
Seamless Incoloy 825 Nickel Alloy Pipe Equivalent Material
The following table presents Incoloy 825 nickel alloy pipe equivalents across major international standards like UNS, JIS, and DIN/EN:
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Incoloy 825 | N08825 | - | NS142 | NCF825 | - | 2.4858 | - |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
What Industries and Applications Commonly use Incoloy 825 Pipes?
825 seamless pipe is used in 8 industries like chemical processing, thermal processing, pollution control, oil & gas recovery, nuclear fuel reprocessing, acid production and pickling operations.
Chemical Processing
Used in heat exchangers, reactors, piping systems, evaporators, pickling tanks, and pollution control systems.
Thermal Processing
Useful for heat exchangers, boilers, condensers, industrial furnaces, and power generation plants.
Pollution Control
This alloy can easily handle highly corrosive flue gases and acidic liquids present in systems like Flue Gas Desulfurization (FGD) scrubbers, dampeners, and waste heat recovery units.
Oil and Gas Recovery
Seamless 825 pipe is extensively used in those oil and gas industries where sour gas (H2S) is present.
Nuclear Fuel Reprocessing
This alloy handles the highly corrosive chemicals used in nuclear fuel reprocessing, including nitric and hydrofluoric acid solutions.
Acid Production and Pickling Operations
Used in phosphoric, sulfuric, and nitric acid production. It is also used in pickling tanks.
Frequently Asked Questions
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What is an Incoloy 825 Pipe?
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What is alloy 825 pipe made of?Alloy 825 pipe is made of nickel (38-46%), iron (minimum 22%), chromium (19.5-23.5%), molybdenum (2.5-3.5%), titanium (0.6-1.2%), and other elements like copper, sulfur, silicon, and aluminium.