Home » Products » Coil,Bar,Flange,Fitting and Valve » 825 Round Bar » ASTM B425 Nickel Alloy Incoloy UNS N08825 2.4858 Round Bar

ASTM B425 Nickel Alloy Incoloy 825 UNS N08825 2.4858 Round Bar

ASTM B425 Nickel Alloy Incoloy UNS N08825 2.4858 Round Bar

① STANDARD: ASTM B160/ ASTM B164/ ASTM B165/ ASTM B166/ ASTM B446/ASTM B637/ASTM B408/ASTM 425/ ASTM 574.... ...
② OD RANGE : 6-300 MM

Quantity:
Availability:





Inquire Add to Basket

Product Description

Product Introduction

Incoloy 825 (UNS N08825, EN 2.4858) is a premium nickel-iron-chromium alloy engineered for exceptional resistance to corrosion and high-temperature environments. With a balanced composition of nickel (38.0–46.0%), chromium (19.50–23.50%), and additions of molybdenum and copper, this alloy combines the best of oxidation resistance, stress corrosion cracking (SCC) resistance, and mechanical strength.

Manufactured to rigorous standards including ASTM B425, B160, and B164, Incoloy 825 round bars undergo precision processing to ensure uniform microstructure, dimensional accuracy, and superior surface finish. The alloy’s unique chemistry makes it a go-to solution for industries where exposure to aggressive acids, saltwater, and high temperatures is unavoidable, offering unparalleled durability in challenging environments.

Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. delivers Incoloy 825 round bars that meet the highest quality benchmarks, providing customers with reliable materials for critical components and structures.

Main Product Parameters

Chemical Composition

Grade	C	Mn	Si	S	Cr	Ni	Fe	Cu	Mo	Ti	Al
Incoloy 825	≤0.05	≤1.00	≤0.50	≤0.03	19.50–23.50	38.0–46.0	≥22.0	1.50–3.00	2.50–3.50	0.60–1.20	≤0.20

Mechanical Properties

Property	Value
Density	8.14 g/cm³
Melting Point	1370–1400°C
Tensile Strength	≥550 MPa (80,000 psi)
Yield Strength (0.2% offset)	≥220 MPa (32,000 psi)
Elongation	≥30%
Hardness (HB)	≤195

Physical Properties

Property	Value
Thermal Conductivity	15.1 W/m·K (100°C)
Electrical Resistivity	103 μΩ·cm
Coefficient of Thermal Expansion	13.3 μm/m·°C (20–100°C)
Elastic Modulus	200 GPa

Dimensions

Diameter Range: 6–300 mm
Length: Customizable per request
Tolerance: ±0.05 mm (dimensional accuracy)

Product Features

Exceptional Corrosion Resistance

Incoloy 825 demonstrates superior resistance to a wide range of corrosive media:

Sulfuric & Phosphoric Acids: Performs well in both oxidizing and reducing conditions, making it ideal for acid processing.
Chloride Environments: Resistant to SCC in saltwater and brine solutions, a critical advantage in marine and offshore applications.
Seawater & Brackish Water: Unaffected by pitting and crevice corrosion, suitable for desalination plants and marine hardware.

High-Temperature Stability

Maintains mechanical properties up to 650°C, ensuring reliability in heat exchangers and furnace components.
Resists oxidation and carburization in high-temperature service, making it suitable for continuous use in thermal cycling environments.

Mechanical Strength & Ductility

Balances high tensile strength (≥550 MPa) with excellent ductility (≥30% elongation), allowing for complex machining and forming.
Retains toughness at low temperatures, making it suitable for cryogenic applications.

Weldability & Fabrication

Readily weldable by TIG, MIG, and stick welding methods without preheating.
Minimal risk of carbide precipitation in heat-affected zones, ensuring post-weld corrosion resistance.
Machinable with standard tools, though slow speeds and high lubrication are recommended for optimal results.

Application Scenarios

Oil & Gas Industry

Offshore Drilling: Subsea pipelines, wellheads, and production equipment exposed to saltwater and corrosive hydrocarbons.
Refining: Heat exchangers, reactors, and piping for processing high-sulfur crude oils.
Chemical Injection Systems: Components for handling acidic fluids in enhanced oil recovery (EOR) processes.

Chemical Processing

Acid Production: Equipment for manufacturing sulfuric, phosphoric, and acetic acids.
Fertilizer Plants: Reactors and vessels for phosphate and nitrogen-based fertilizer production.
Pharmaceutical Manufacturing: Corrosion-resistant components for handling aggressive chemical intermediates.

Power Generation

Flue Gas Desulfurization (FGD): Scrubbers, ducts, and heat exchangers in coal-fired power plants.
Geothermal Energy: Tubing and valves for high-temperature, acidic brine systems.
Nuclear Facilities: Components in spent fuel processing and radioactive waste handling.

Marine & Desalination

Desalination Plants: Heat exchangers, pumps, and pipelines in seawater reverse osmosis (SWRO) systems.
Marine Engineering: Shipboard equipment, offshore platforms, and coastal structures.

Paper & Pulp Industry

Bleaching Processes: Digesters, chlorine dioxide reactors, and bleach plant piping.
Chemical Pulping: Equipment for handling sulfurous acids and alkaline solutions.

FAQ

What is the difference between Incoloy 825 and Incoloy 800?

Composition: Incoloy 825 contains molybdenum (2.50–3.50%) and copper (1.50–3.00%), while Incoloy 800 lacks these elements.
Corrosion Resistance: 825 offers better resistance to reducing acids and chloride-induced SCC, while 800 is optimized for high-temperature oxidation resistance.
Applications: 825 is ideal for acidic environments, whereas 800 suits high-temperature, low-corrosion settings like furnace parts.

Can Incoloy 825 be used in nitric acid?

Incoloy 825 performs best in reducing acids. For nitric acid (oxidizing), consider alloys like Incoloy 800 or 316 stainless steel for better resistance.

What is the maximum service temperature for Incoloy 825?

Incoloy 825 maintains corrosion resistance up to 650°C in continuous service. For short-term exposure, it can withstand temperatures up to 980°C.

Is Incoloy 825 magnetic?

No, Incoloy 825 is non-magnetic, making it suitable for applications where magnetic interference is a concern, such as in sensors or medical equipment.

How should Incoloy 825 be welded?

Use nickel-based filler metals (e.g., ERNiCrMo-3) and low heat input to minimize thermal stress. Post-weld heat treatment is rarely needed, but annealing can improve ductility for critical components.

Does Incoloy 825 require surface treatment?

Standard pickling or passivation is sufficient for most applications. Polishing can be applied for aesthetic purposes or to enhance corrosion resistance in hygienic environments.