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ASTM B423 / B423M is the standard specification for "Seamless Pipe and Tube" made from a specific Nickel-Iron-Chromium-Molybdenum-Copper alloy.
This standard is dedicated to a single, highly important alloy: UNS N08825, N08221, and N06845 It covers the requirements for seamless, hot-finished, or cold-worked pipes and tubes intended for general corrosive service.
The standard defines the chemical composition, mechanical properties, dimensions, tolerances, and testing for seamless pipes and tubes made from this alloy.
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ASTM B423 NiFeCrMoCu Alloy Seamless Pipe & Tube Overview
| Item | Description |
|---|---|
| Product Name | ASTM B423 NiFeCrMoCu Alloy Seamless Pipe & Tube |
| Material Grade | UNS N08825 / Alloy 825 |
| Alloy Type | Nickel-Iron-Chromium Alloy with Molybdenum and Copper |
| Key Features | Excellent corrosion resistance, high-temperature stability, and outstanding mechanical reliability |
| Corrosion Resistance | Resistant to sulfuric acid, phosphoric acid, chloride-containing media, and stress corrosion cracking |
| Manufacturing Form | Seamless Pipe, Seamless Tube, Heat Exchanger Tube |
| Service Environment | Corrosive chemical processes, marine conditions, and high-temperature industrial systems |
Typical Applications
| Industry | Common Applications |
|---|---|
| Chemical Processing | Process piping, acid handling systems, reactors |
| Heat Transfer Equipment | Heat exchangers, condensers, cooling systems |
| Oil & Gas | Process tubing, offshore piping, sour service systems |
| Marine Engineering | Seawater pipelines, desalination facilities |
| Environmental Protection | Flue gas desulfurization (FGD) units |
| Industrial Manufacturing | Corrosion-resistant process equipment |
Performance Advantages
| Property | Benefit |
|---|---|
| Pitting Corrosion Resistance | Enhanced protection in chloride-rich environments |
| Stress Corrosion Cracking Resistance | Reliable performance under aggressive service conditions |
| Oxidation Resistance | Suitable for elevated-temperature applications |
| Mechanical Stability | Maintains strength during long-term operation |
| Service Life | Reduced maintenance and extended equipment lifespan |
Manufacturing & Supply Capability
| Item | Capability |
|---|---|
| Product Range | Seamless Pipes, Seamless Tubes, Heat Exchanger Tubing |
| Dimensional Control | Tight OD, WT, and length tolerances |
| Quality Assurance | PMI, mechanical testing, NDT inspection, hydrostatic testing |
| Packaging | Export-standard seaworthy packaging |
| Target Customers | EPC Contractors, Industrial Distributors, Engineering Companies, OEM Manufacturers |
| Supplier | Xi'an Dongmeng Group Co., Ltd |
ASTM B423 NiFeCrMCu Alloy Seamless Pipe & Tube Chemical Composition:
ASTM B423 NiFeCrMCu Alloy Seamless Pipe & Tube mechanical properties
ASTM B423 NiFeCrMCu Alloy Seamless Pipe & Tube mechanical properties 1.1
ASTM B423 NiFeCrMCu Alloy Seamless Pipe & Tube permissible variations 1.2
ASTM B423 NiFeCrMCu Alloy Seamless Pipe & Tube tolerances
ASTM B423 NiFeCrMCu Alloy Seamless Pipe & Tube
| Alloy Grade | UNS Number | Key Characteristics | Main Advantages | Typical Applications |
|---|---|---|---|---|
| Alloy 825 | UNS N08825 | Titanium-stabilized austenitic nickel-iron-chromium alloy designed for broad corrosion resistance. | • Excellent resistance to sulfuric and phosphoric acids• Good resistance to nitric acid• Outstanding resistance to chloride SCC• Proven performance in harsh chemical environments | • Chemical processing piping• Pickling tanks and coils• Sour service oil & gas tubing• Phosphoric acid evaporators• Nuclear fuel reprocessing systems |
| Alloy 22 | UNS N08221 | Dual-stabilized (Ti + Nb) version of Alloy 825 with enhanced weldability and thermal stability. | • Improved resistance to sensitization• Superior weld zone corrosion resistance• Excellent structural stability after welding• Ideal for fabricated and welded systems | • Chemical reactor piping• Welded heat exchangers• FGD systems• Process plant piping• Large welded structures |
| Alloy 945 | UNS N06845 | High-strength nickel alloy engineered for demanding pressure and corrosion service. | • Exceptional mechanical strength• Age-hardenable (precipitation hardening)• High resistance to sour service environments• Reduced wall thickness requirements | • Downhole tubing• Tubing hangers• Subsea equipment• High-strength fasteners• Aerospace components• High-pressure process systems |
Quick Comparison
| Property | Alloy 825 (N08825) | Alloy 22 (N08221) | Alloy 945 (N06845) |
|---|---|---|---|
| Corrosion Resistance | ★★★★★ | ★★★★★ | ★★★★☆ |
| Weldability | ★★★★☆ | ★★★★★ | ★★★★☆ |
| High Temperature Stability | ★★★★☆ | ★★★★★ | ★★★★☆ |
| Mechanical Strength | ★★★☆☆ | ★★★☆☆ | ★★★★★ |
| Sour Service Performance | ★★★★☆ | ★★★★☆ | ★★★★★ |
| Best For | General Corrosion Service | Welded Fabrications | High-Strength Applications |
Excellent Hot & Cold Forming Capability
Processing Characteristics of ASTM B423 NiFeCrMoCu Alloy Seamless Tubing
| Processing Operation | Performance Description |
|---|---|
| Precision Cold Forming | Maintains excellent shape retention and dimensional consistency during forming operations |
| Automated CNC Processing | Delivers reliable machining results for complex industrial components |
| Tube Forming & Bending | Supports various bending requirements while preserving structural integrity |
| Mechanical Expansion | Suitable for tube expansion and fitting applications with minimal deformation issues |
| Rolling & Shaping | Performs well in secondary fabrication processes requiring accurate geometry control |
| Joint Preparation | Provides clean edge quality for subsequent welding and assembly operations |
| Formability | Combines good plasticity with excellent resistance to fabrication-induced defects |
| Manufacturing Applications | Well suited for custom process equipment, heat exchangers, and industrial piping systems |
Recommended Machining Practices
| Machining Parameter | Best Practice |
|---|---|
| Cutting Conditions | Moderate machining speeds help maximize tool life and machining stability |
| Tool Selection | Premium carbide inserts are recommended for improved cutting efficiency |
| Cooling Method | Continuous coolant flow enhances chip evacuation and temperature control |
| Feed Optimization | Controlled feed settings help achieve better dimensional accuracy |
| Surface Quality | Optimized machining parameters contribute to a uniform finished surface |
| Tolerance Control | Rigid equipment setup supports high-precision manufacturing requirements |
Product Specifications
| Product Type | Seamless Pipe / Seamless Tube |
|---|---|
| Outer Diameter | 6 mm – 630 mm |
| Wall Thickness | 0.5 mm – 60 mm |
| Length | Up to 12 meters |
| Surface Finish | Pickled / Annealed / Bright Annealed |
| Manufacturing Process | Cold Drawn / Hot Finished |
| Pipe Ends | Plain End / Beveled End |
| Size Standard | ASTM / ASME / DIN / EN |
Product Delivery Standards
| Standard | Description |
|---|---|
| ASTM B423 | Nickel-Iron-Chromium-Molybdenum-Copper Alloy Pipe |
| ASME SB423 | Boiler & Pressure Vessel Specification |
| ASTM B829 | General Nickel Alloy Pipe Requirements |
| ASTM B880 | Quality Requirements for Nickel Alloy Products |
| EN / DIN Standards | Available Upon Request |
Inspection & Quality Assurance
FAQ
What is ASTM B423 NiFeCrMoCu Alloy?
ASTM B423 is a standard specification for seamless nickel-iron-chromium-molybdenum-copper alloy pipes and tubes, commonly corresponding to UNS N08825 / Alloy 825.
Is UNS N08825 suitable for seawater applications?
Yes. Alloy 825 offers excellent resistance to seawater corrosion, chloride attack, and stress corrosion cracking.
Can you provide custom pipe sizes?
Yes. Custom OD, wall thickness, and cut lengths are available according to project requirements.
What inspection certificates can you provide?
We can provide EN 10204 3.1 MTC, PMI reports, UT reports, hydrostatic test reports, and third-party inspection certificates.
What industries commonly use ASTM B423 pipes?
Chemical processing, offshore engineering, marine systems, oil & gas, heat exchangers, and power generation industries.
Are your pipes seamless or welded?
We mainly supply seamless pipes and tubes manufactured according to ASTM B423 and ASME SB423 standards.
Do you support OEM marking?
Yes. Custom marking, labeling, and packaging are available for distributors and project contractors.
What is your delivery time?
Standard production lead time is typically 7–25 days depending on specifications and order quantity.
Contact Us
Xi'an Dongmeng Group Co., Ltd
Professional Nickel Alloy Pipe & Tube Manufacturer
Phone / WhatsApp / WeChat: +8615769214734
Email: office@dongmjd.com
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