All Products

Subscribe to our Newsletter

Model No: ASTM B425 UNS N08825

ASTM B425 UNS N08825 Alloy 825 Round Bar

ZYTC Alloy supplies ASTM B425 UNS N08825 Incoloy 825 round bar. Full‑size nickel alloy bars with 3.1 certificate for chemical, oil‑gas & marine corrosive service.

Quantity :

Contact Now

ASTM B425 UNS N08825 (Incoloy 825) Round Bar is a premium nickel‑iron‑chromium alloy reinforced with molybdenum, copper, and titanium elements. Designed for all‑round corrosion resistance in both oxidizing and reducing chemical environments, this nickel alloy delivers stable mechanical strength, excellent ductility, and reliable weldability across extreme working conditions.

Widely recognized in global industrial supply chains, Incoloy 825 round bars serve as core structural and machining components for chemical processing, acid production, oil & gas sour service, marine offshore, and environmental pollution control systems.

As a professional China nickel alloy supplier ZYTC Alloy, we supply fully ASTM B425 / ASME SB425 compliant Alloy 825 round bars, square bars, hex bars and custom machined parts with complete certification and full technical traceability.

Standard & Grade Definition

UNS N08825 (Alloy 825 / Incoloy 825) is the unified material designation for this nickel‑based functional alloy. ASTM B425 / ASME SB425 is the governing industrial standard covering hot‑finished, cold‑drawn, and annealed nickel alloy rods and bars, specifying chemical composition, mechanical tolerance, dimensional accuracy, and delivery technical requirements. For forging‑grade blanks and forged components, the auxiliary standard ASTM B564 / ASME SB564 is applicable.

Chemical Composition (UNS N08825, ASTM B425)

The optimized element ratio enables Alloy 825 to achieve balanced anti‑corrosion performance against acids, chlorides, and mixed corrosive media.

Element	Composition (wt %)
Nickel (Ni)	38.0‑46.0
Chromium (Cr)	19.5‑23.5
Molybdenum (Mo)	2.5‑3.5
Copper (Cu)	1.5‑3.0
Titanium (Ti)	0.6‑1.2
Iron (Fe)	Balance
Carbon (C)	≤ 0.05
Manganese (Mn)	≤ 1.00
Silicon (Si)	≤ 0.50
Sulfur (S)	≤ 0.03
Aluminum (Al)	≤ 0.20

Nickel resists chloride stress corrosion cracking; molybdenum and copper enhance reducing acid resistance; chromium provides excellent oxidation resistance; titanium stabilizes the microstructure to avoid intergranular corrosion during welding and heat treatment.

Mechanical Properties (Annealed Condition, ASTM B425)

ZYTC Alloy strictly controls heat treatment processes to ensure stable mechanical performance meeting ASTM B425 benchmark.

Property	Metric	Imperial
Tensile Strength, Min	586 MPa	85 ksi
Yield Strength (0.2% Offset), Min	241 MPa	35 ksi
Elongation, Min	30 %	30 %

Forging‑quality bars follow chemical and surface inspection standards with customizable mechanical indicators according to project demands.

Core Corrosion Resistance Advantages

Different from ordinary stainless steel and single‑function nickel alloys, UNS N08825 features dual anti‑corrosion capabilities, making it ideal for complex industrial corrosive environments:

Excellent resistance to sulfuric acid and phosphoric acid reducing media
Strong anti‑pitting and anti‑crevice corrosion performance in high‑chloride environments
Effectively inhibits chloride‑induced stress corrosion cracking (SCC)
Resists intergranular corrosion after welding and high‑temperature service
Stable performance in alternating oxidizing and reducing working conditions

Product Specifications & Size Range

ZYTC Alloy provides full‑size standard stock and custom processed Alloy 825 bar products to support diverse engineering procurement:

Product Forms: Round bar, square bar, hex bar, flat bar, custom machined shaft parts
Diameter Range: 3mm – 500mm
Length: 1000mm – 6000mm, custom fixed‑length cutting available
Delivery Condition: Hot finished, cold drawn, fully annealed, forging quality
Surface Finish: Black, peeled, turned, polished, centerless ground

Applications

Thanks to its comprehensive corrosion resistance and mechanical stability, ASTM B425 Alloy 825 round bars are widely adopted in high‑reliability industrial fields:

Chemical Processing Industry

Sulfuric & phosphoric acid production equipment, pickling system components, heat exchanger shafts, chemical reactor fasteners, and corrosive medium conveying structural parts.

Oil & Gas Sour Service

Downhole equipment, valve components, pump shafts, and structural parts exposed to H₂S and chloride sour environments.

Marine & Offshore Engineering

Seawater corrosion‑resistant shafts, offshore platform structural components, flue gas desulfurization scrubber parts, and marine exhaust system accessories.

Environmental & Industrial Equipment

Pollution control equipment, water treatment processing components, pressure vessel parts, and long‑service‑life industrial machined components.

Manufacturing & Custom Processing Capability

ZYTC Alloy integrates precision smelting, rolling, heat treatment, and finishing processing. We can provide one‑stop customized services including fixed‑length cutting, surface polishing, precision grinding, and CNC machining. Whether standard inventory bars or non‑standard special‑size forgings and finished parts, we can meet strict dimensional tolerance and surface quality requirements for high‑end engineering projects.

Quality Inspection & Certification

To ensure global project compliance, all ZYTC Alloy UNS N08825 round bars support full‑process inspection and complete document provision:

EN 10204 3.1 Material Test Certificate (Standard provision)
Chemical composition & mechanical property test reports
Dimensional tolerance, straightness and surface inspection reports
PMI component verification, UT ultrasonic flaw detection (upon request)
Third‑party authoritative inspection support
Full material traceability system

ASTM B425 VS ASTM B564 Standard Difference

ASTM B425 / ASME SB425 is the core standard for finished Alloy 825 round bars, square bars and profile rods, applicable to direct machining and structural use. ASTM B564 / ASME SB564 mainly applies to forgings and forging stock blanks. For conventional round bar procurement, ASTM B425 is the primary specification; for customized forged parts, B564 standards will be adopted.

Why Choose ZYTC Alloy for Alloy 825 Round Bar?

Strict Standard Compliance: 100% follow ASTM B425 industrial specifications, stable chemical composition and mechanical properties
Full Specification Stock: Complete size range, fast delivery, support small‑batch customized processing
Advanced Quality Control: Multi‑channel inspection to eliminate internal defects and surface flaws
Professional Technical Support: Provide material selection guidance and project matching solutions
Reliable Global Supply: Standard export packaging, complete certification, supporting long‑term bulk cooperation

ASTM B425 UNS N08825 Incoloy 825 round bar is an irreplaceable high‑performance nickel alloy material for chemical corrosion, marine offshore, and oil & gas harsh working conditions. With dual oxidation and reduction corrosion resistance, stable mechanical performance and excellent processability, it effectively reduces equipment failure rate and long‑term maintenance costs. For high‑quality, certified Alloy 825 round bars and custom nickel alloy components, ZYTC Alloy is your trustworthy long‑term supplier from China.

Contact us to get the latest factory price, technical datasheets and customized solution support.

Email: daisy@zytcsteel.com
WhatsApp/WeChat: +86 17335753350