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ASTM B165 UNS N04400 seamless pipe and tube, commonly known as Monel 400 pipe, is a premium nickel-copper alloy pipe product designed for highly corrosive industrial environments. With outstanding resistance to seawater corrosion, hydrofluoric acid, alkalis, and chloride-containing media, Monel 400 seamless tube is widely used in offshore engineering, marine piping systems, chemical processing plants, heat exchangers, and oil & gas industries.
Compared with conventional stainless steel pipes, UNS N04400 pipe provides significantly better resistance to pitting corrosion, stress corrosion cracking, and seawater erosion. Due to its high nickel content and stable metallurgical structure, ASTM B165 Monel 400 pipe maintains excellent mechanical properties across both elevated and sub-zero temperatures.
Xi'an Dongmeng Group Co., Ltd supplies high-quality ASTM B165 Monel 400 seamless pipes and tubes in custom dimensions, offering strict quality inspection, fast production lead time, and worldwide export service for industrial EPC contractors, distributors, and end users.
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What Is ASTM B165 UNS N04400 Monel 400 Pipe?
ASTM B165 UNS N04400 seamless pipe is manufactured from solid-solution strengthened nickel-copper alloy Monel 400. The alloy typically contains approximately 63% nickel and 28-34% copper, delivering an exceptional combination of:
Corrosion resistance
Mechanical strength
Thermal stability
Weldability
Long service life
Monel 400 seamless tubes are especially suitable for applications involving:
Seawater exposure
Hydrofluoric acid systems
Sulfuric acid environments
Marine atmosphere
Alkali processing
High-temperature chemical processing
The material performs exceptionally well under flowing seawater conditions, making it one of the most reliable nickel alloy pipe materials for offshore and marine engineering systems.
Mechanical properties of pipe and tube
chemical requirements
permissible variations for outside diameter and wall thickness of seamless cold worked pipe and tube
permissible variations in length
mechanical properties of small-diameter and light-wall tubing
permissible variations for small-diameter and light wall tube
tolerances on cut lengths of light wall tube
pipe schedules
Corrosion Resistance Analysis
Outstanding Seawater Corrosion Resistance
One of the key advantages of Monel 400 seamless pipe is its exceptional resistance to seawater corrosion. The alloy demonstrates excellent durability under both stagnant and high-velocity seawater conditions.
Excellent Resistance To
Flowing seawater
Marine atmosphere
Hydrofluoric acid
Sulfuric acid (limited conditions)
Alkalis
Neutral salts
Brine systems
Corrosion Resistance Benefits
Reduced maintenance cost
Long offshore service life
Lower replacement frequency
Improved operational safety
Stable long-term performance
Processing Performance Analysis
ASTM B165 UNS N04400 pipe exhibits excellent hot and cold working capabilities, allowing manufacturers to produce precision seamless tubes and pipes for demanding industrial applications.
Available Processing Methods
Cold drawing
Hot extrusion
CNC machining
Precision turning
Tube bending
Hydroforming
Deep drawing
Processing Advantages
Excellent ductility
Stable dimensional tolerance
Smooth surface finish
Reliable machining performance
High forming flexibility
Welding Performance Analysis
Monel 400 seamless pipe has excellent weldability using conventional industrial welding techniques.
Recommended Welding Methods
GTAW / TIG
GMAW / MIG
SMAW
Submerged Arc Welding
Recommended Filler Materials
ERNiCu-7
ENiCu-7
Welding Advantages
Low crack sensitivity
Stable weld structure
Excellent joint strength
Good post-weld corrosion resistance
Post-weld heat treatment is generally unnecessary for most industrial applications.
Heat Resistance Performance
UNS N04400 Monel 400 pipe maintains stable mechanical performance across a wide temperature range.
Temperature Performance Features
Excellent cryogenic toughness
Stable elevated temperature strength
Good oxidation resistance
Reliable thermal fatigue resistance
This makes Monel 400 pipe suitable for:
Heat exchangers
Thermal transfer systems
Cryogenic equipment
High-temperature process piping
Product Specifications
ASTM B165 UNS N04400 Seamless Pipe Dimensions
| Outer Diameter | Wall Thickness | Length |
|---|---|---|
| 6.35 mm – 457 mm | 0.5 mm – 30 mm | Max 12 meters |
| 1/4" – 18" | SCH5S – SCHXXS | Custom Length |
Available Product Forms
Seamless Pipe
Seamless Tube
Heat Exchanger Tube
Condenser Tube
U Tube
Coiled Tube
Capillary Tube
Precision Tube
Manufacturing Standards
| Standard | Description |
|---|---|
| ASTM B165 | Seamless Pipe & Tube |
| ASME SB165 | Pressure Pipe |
| ASTM B163 | Heat Exchanger Tube |
| ASTM B725 | Welded Pipe |
| NACE MR0175 | Sour Service Standard |
Surface Finish Options
Pickled Surface
Bright Annealed
Polished Finish
Sand Blasted
Mechanical Polishing
Industrial Applications of ASTM B165 UNS N04400 Pipe
Offshore & Marine Engineering
Applications
Offshore platforms
Seawater piping systems
Marine condensers
Shipbuilding pipelines
Desalination plants
Benefits
Outstanding seawater resistance
Long-term offshore reliability
Chloride corrosion resistance
Chemical Processing Industry
Applications
Acid transfer systems
Chemical reactors
Heat exchangers
Alkali processing systems
Industrial pressure pipelines
Benefits
Hydrofluoric acid resistance
Stable chemical performance
Reduced maintenance downtime
Oil & Gas Industry
Applications
Sour gas systems
Offshore tubing
Petrochemical piping
Heat recovery systems
Refinery processing lines
Benefits
Reliable pressure stability
Corrosion resistance
Long operational life
Heat Exchanger Industry
Applications
Condenser tubes
Thermal transfer pipelines
Industrial cooling systems
U tube heat exchangers
Benefits
Excellent thermal conductivity
Anti-scaling performance
Stable long-term operation
Production Capability
Xi'an Dongmeng Group Co., Ltd provides comprehensive nickel alloy seamless pipe manufacturing solutions.
Production Features
Cold Drawn Seamless Pipe Production
Hot Finished Pipe Manufacturing
Precision Tube Processing
Large Diameter Alloy Pipe Production
Thin Wall Tube Manufacturing
Custom Size Production
Supply Capability
Fast delivery support
Large inventory
OEM customization
Export packaging service
Global logistics support
Inspection & Quality Assurance
Every ASTM B165 UNS N04400 seamless pipe undergoes strict inspection and testing procedures.
Inspection Procedures
PMI Positive Material Identification
Ultrasonic Testing
Hydrostatic Testing
Eddy Current Testing
Flattening Test
Flaring Test
Chemical Composition Analysis
Mechanical Property Testing
Dimensional Inspection
Surface Quality Inspection
Third-Party Inspection Available
SGS
BV
TUV
Lloyd's
DNV
Quality Documents
EN 10204 3.1 Certificate
Mill Test Certificate (MTC)
Raw Material Traceability
Inspection Reports
Packaging & Shipping
Export Packaging Solutions
Seaworthy wooden cases
Waterproof wrapping
Plastic end caps
Anti-rust protection
Bundle packaging
Custom labeling support
Shipping Methods
Sea Freight
Air Freight
Railway Transportation
Express Delivery
Why Choose Xi'an Dongmeng Group Co., Ltd
Professional Nickel Alloy Manufacturer
Rich export experience
Advanced production equipment
Strict quality control
Competitive factory price
Custom manufacturing support
Reliable Global Supplier
Stable raw material sourcing
Fast production lead time
Worldwide logistics support
Professional technical service
Experienced export team
FAQ
What is ASTM B165 UNS N04400 seamless pipe?
ASTM B165 UNS N04400 seamless pipe is a nickel-copper alloy seamless pipe manufactured from Monel 400 alloy with excellent seawater and chemical corrosion resistance.
Is Monel 400 pipe suitable for seawater applications?
Yes. Monel 400 seamless pipe is widely used in seawater piping systems due to its exceptional resistance to marine corrosion and chloride environments.
What is the difference between Monel 400 and stainless steel pipe?
Monel 400 pipe offers significantly better resistance to seawater corrosion, hydrofluoric acid, and chloride stress corrosion cracking than standard stainless steel pipes.
Can UNS N04400 pipe be welded?
Yes. ASTM B165 Monel 400 seamless pipes have excellent weldability using TIG, MIG, and SMAW welding methods.
What industries use Monel 400 seamless tubes?
Monel 400 tubes are widely used in offshore engineering, marine systems, heat exchangers, desalination plants, petrochemical processing, and chemical industries.
What sizes are available for ASTM B165 Monel 400 pipe?
Available sizes range from 1/4" to 18" outer diameter with SCH5S to SCHXXS wall thicknesses and custom lengths.
Does Monel 400 pipe resist hydrofluoric acid?
Yes. UNS N04400 pipe provides excellent resistance to hydrofluoric acid, making it suitable for chemical processing systems.
Can you provide PMI and third-party inspection?
Yes. PMI testing, NDT inspection, SGS, BV, TUV, and EN 10204 3.1 certification are available upon request.
Contact Us
Xi'an Dongmeng Group Co., Ltd
Professional Nickel Alloy Pipe & Tube Manufacturer
Phone / WhatsApp / WeChat: +8615769214734
Email: office@dongmjd.com
Website: https://www.cndmmetal.com
Services:
Factory Direct Supply
OEM & Custom Manufacturing
Global Export Support
Fast Quotation Service
Technical Consultation
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