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ASTM B677 UNS N08925 / N08354 / N08926 Seamless Pipe Supplier
ASTM B677 UNS N08925, UNS N08354 and UNS N08926 seamless pipes are high-performance nickel alloy pipes designed for highly corrosive industrial environments involving chlorides, sulfuric acid, seawater, acidic gases and high-temperature process media.
At Xi'an Dongmeng Group Co., Ltd, we manufacture and export ASTM B677 seamless pipes for global EPC contractors, offshore engineering companies, chemical plants, heat exchanger manufacturers and industrial distributors. Our nickel alloy seamless pipes are widely used in seawater systems, flue gas desulfurization units, offshore platforms, acid transfer systems and high-pressure chemical processing pipelines.
Compared with conventional stainless steel pipes, ASTM B677 nickel alloy seamless pipes provide significantly improved resistance to:
Chloride pitting corrosion
Crevice corrosion
Stress corrosion cracking
Sulfuric acid corrosion
Seawater attack
High-temperature oxidation
Our factory supplies cold drawn and hot finished seamless pipes with strict dimensional tolerance control, stable metallurgy and complete inspection documentation for international industrial projects.
Product Introduction
UNS N08925 (Alloy 825) Seamless Pipe
UNS N08925 seamless pipe is a nickel-iron-chromium alloy stabilized with titanium. It offers excellent resistance to sulfuric acid, phosphoric acid, seawater and chloride-containing environments. Alloy 825 pipe is widely used in offshore oil & gas, pickling systems and acid processing equipment.
Main Advantages
Strong resistance to reducing and oxidizing acids
Excellent SCC resistance
Stable high-temperature strength
Good fabrication and welding performance
UNS N08354 (654 SMO) Seamless Pipe
UNS N08354 seamless pipe is a high-alloy austenitic stainless nickel alloy pipe with extremely high molybdenum content. It is specifically engineered for severe chloride environments and seawater applications.
Main Advantages
Exceptional pitting resistance
Outstanding seawater corrosion resistance
High PREN value
Excellent crevice corrosion resistance
UNS N08926 (Alloy 926) Seamless Pipe
UNS N08926 seamless pipe is a super austenitic nickel alloy pipe designed for aggressive chloride and sour service environments.
Main Advantages
Excellent resistance to sour gas corrosion
Superior resistance to chloride attack
High strength and toughness
Excellent resistance in marine systems
Products chemical requirements & mechanical properties
Comparison of the Three Alloys
All three alloys (N08925, N08354, N08926) are part of the "super-austenitic" stainless steel family, but they have distinct compositions and properties. They are all superior to standard 316L stainless steel.
Here is a detailed comparison:
| Feature | UNS N08926 (Alloy 926 / 1.4529) | UNS N08354 (Alloy 31 / 1.4562) | UNS N08925 (Alloy 925) |
|---|---|---|---|
| Common Name | Alloy 926, 1.4529 | Alloy 31, 1.4562 | Alloy 925 |
| Key Composition | ~25% Ni, 20% Cr, 6.5% Mo, ~0.8% Cu, 0.18% N | ~27% Ni, 20.5% Cr, 6.5% Mo, 1.5% Cu, 0.22% N | ~25% Ni, 21% Cr, 4.5% Mo, 1.8% Cu, 0.01% N (Max) |
| PREN | ~46 | ~49 | ~37 |
| Key Characteristics | Excellent all-around resistance to chlorides, acids, and seawater. High strength from nitrogen. | Highest PREN of the three. Superior resistance to pitting/crevice corrosion, and very strong resistance to sulfuric acid. | Age-hardenable. Good corrosion resistance, but its main advantage is high strength. |
| Primary Advantage | Balanced performance for a wide range of corrosive conditions. | Maximum resistance to localized corrosion (pitting/crevice) in extreme chloride environments. | High Mechanical Strength (yield strength > 100 ksi / 690 MPa after aging). |
| Common Applications | Seawater systems, offshore platforms, flue gas desulfurization, chemical process equipment. | Chemical processing (especially sulfuric & phosphoric acid), seawater coolers, aggressive pulp & mill environments. | Downhole oil & gas components (tubing, hangers), high-strength fasteners, valve parts where strength and corrosion resistance are both needed. |
Key Properties and Applications
1. Corrosion Resistance:
Excellent Pitting & Crevice Corrosion Resistance: The high Molybdenum (Mo) and Nitrogen (N) content give these alloys a very high Pitting Resistance Equivalent Number (PREN).
PREN = %Cr + 3.3x(%Mo) + 16x(%N)
Resistance to Chlorides: They are far more resistant to chloride-induced stress corrosion cracking (SCC) than standard 304/316 stainless steels.
General Corrosion: Excellent resistance to a wide range of acids, including sulfuric, phosphoric, and organic acids.
2. Mechanical Properties (per ASTM B677):
The standard specifies minimum mechanical properties for the pipe in the annealed condition. Typical values are:
Tensile Strength: 94 - 110 ksi (650 - 760 MPa)
Yield Strength (0.2% Offset): 45 - 65 ksi (310 - 450 MPa)
Elongation: 35% minimum (in 2 inches / 50mm)
*(Note: Alloy N08925 is often supplied in a solution-annealed condition and can be age-hardened to achieve significantly higher strength levels, which is its primary purpose.)*
3. Common Industrial Applications:
Chemical & Petrochemical Processing: Reactors, heat exchangers, piping for aggressive chemicals.
Oil & Gas: Downhole tubing, wellhead components, flow lines, especially in sour service (H₂S containing) environments.
Marine & Offshore: Seawater piping systems, heat exchangers, ballast systems.
Pollution Control: Flue Gas Desulfurization (FGD) systems, scrubbers, and ducting.
Pulp & Paper Industry: Digesters, bleach plants.
Machining Performance Analysis
ASTM B677 nickel alloy seamless pipes require advanced machining control because of their high nickel and molybdenum content. Compared with standard stainless steel pipes, these alloys generate higher cutting heat and work hardening effects.
Our factory uses:
CNC precision machining systems
Low-speed heavy-duty cutting technology
Carbide tooling optimization
Controlled coolant systems
Multi-stage dimensional inspection
This ensures:
Accurate wall thickness tolerance
Smooth internal pipe surface
Stable concentricity
Reduced deformation during machining
For EPC projects and precision heat exchanger systems, our seamless nickel alloy pipes provide reliable welding preparation and high installation efficiency.
Welding Performance Analysis
UNS N08925, N08354 and N08926 seamless pipes exhibit excellent welding performance when proper filler metals and heat input controls are applied.
Recommended Welding Processes
GTAW / TIG Welding
GMAW / MIG Welding
Plasma Arc Welding
Automatic Orbital Welding
Welding Advantages
Low hot cracking tendency
Stable weld metallurgy
Excellent post-weld corrosion resistance
Strong weld joint integrity
Our pipes are widely used in automatic welding systems for offshore pipelines, heat exchanger tubing and high-purity industrial piping.
Corrosion Resistance Analysis
One of the major advantages of ASTM B677 seamless pipes is their superior corrosion resistance in aggressive industrial environments.
Resistance Capabilities
Chloride Environments
Excellent resistance to:
Pitting corrosion
Crevice corrosion
Chloride SCC
Acid Processing
Suitable for:
Sulfuric acid
Phosphoric acid
Organic acid systems
Marine & Offshore Systems
Reliable performance in:
Seawater cooling systems
Offshore platforms
Desalination plants
Sour Gas Conditions
Strong resistance against:
H₂S corrosion
Sour gas attack
Wet chloride systems
These features make ASTM B677 nickel alloy seamless pipes ideal for high-corrosion industrial applications where standard stainless steel pipes fail prematurely.
Industry Applications
Offshore & Marine Industry
Applications
Offshore platform piping
Seawater cooling systems
Marine exhaust systems
Desalination pipelines
Benefits
Superior seawater resistance
Long offshore service life
Reduced maintenance costs
Chemical Processing Industry
Applications
Acid transfer pipelines
Chemical reactors
Heat exchangers
Pressure vessels
Benefits
Excellent acid resistance
Stable high-temperature performance
Reliable process safety
Oil & Gas Industry
Applications
Sour gas pipelines
Subsea flow systems
Downhole tubing
Refinery process piping
Benefits
H₂S resistance
Chloride SCC resistance
High-pressure reliability
Flue Gas Desulfurization (FGD)
Applications
FGD scrubbers
Chimney liners
Slurry piping systems
Waste gas treatment equipment
Benefits
Acid condensate resistance
Long-term corrosion protection
Excellent oxidation resistance
Product Specifications
| Parameter | Range |
|---|---|
| Standard | ASTM B677 / ASME SB677 |
| Pipe Type | Seamless Pipe / Tube |
| OD | 6mm – 610mm |
| WT | 0.5mm – 40mm |
| Length | 3m / 6m / Custom |
| Surface | Pickled / Bright Annealed / Polished |
| End Type | Plain End / Beveled End / Threaded |
| Processing | Cold Drawn / Hot Rolled |
| Tolerance | According to ASTM Standards |
Standards & Specifications
International Standards
ASTM B677
ASME SB677
ASTM B829
ASTM A269
ASTM A312
EN 10216
DIN Standards
NACE MR0175
Inspection Standards
EN 10204 3.1 / 3.2
PMI Testing
Ultrasonic Testing
Eddy Current Testing
Hydrostatic Testing
Production Capacity
Xi'an Dongmeng Group Co., Ltd has extensive manufacturing capability for nickel alloy seamless pipes and tubes.
Manufacturing Capability
Annual production capacity: 8,000+ tons
Advanced cold drawing lines
Solution annealing furnaces
Online eddy current testing systems
CNC machining centers
Export Markets
Europe
Middle East
Southeast Asia
South America
North America
We support OEM manufacturing, custom dimensions and project-based production for industrial EPC customers.
Inspection & Quality Assurance
Quality control is critical for high-performance nickel alloy seamless pipes used in corrosive industrial systems.
Our Inspection Process
Raw Material Inspection
Spectrometer chemical analysis
Raw material traceability
PMI verification
Production Inspection
OD & WT dimensional control
Surface defect inspection
Straightness inspection
Final Testing
Hydrostatic testing
Ultrasonic testing
Eddy current testing
Mechanical property testing
Intergranular corrosion testing
Third-Party Inspection
Available by:
SGS
BV
TUV
DNV
Lloyd's
Every shipment can be supplied with complete MTC EN 10204 3.1 documentation.
Packaging & Shipping
Our export packaging system is designed for international industrial transportation and long-distance sea shipment.
Packaging Methods
Wooden export cases
Waterproof wrapping
Plastic end caps
Steel strip bundling
Fumigation-free packaging
Shipping Support
FOB / CIF / DDP terms
Container loading service
Global freight coordination
Export customs documentation
We ensure safe delivery of nickel alloy seamless pipes for offshore, EPC and industrial projects worldwide.
Why Choose Us
Factory Direct Nickel Alloy Pipe Supplier
Professional nickel alloy manufacturing experience
Strict ASTM production standards
Stable raw material sourcing
Competitive factory pricing
Strong Technical Support
Material selection assistance
Corrosion resistance recommendations
Welding guidance
Project quotation support
Export Experience
Global industrial project supply
Complete export documentation
Fast response for RFQ inquiries
Flexible custom manufacturing
Reliable Quality
Full traceability system
Third-party inspection available
Stable dimensional tolerance
Industrial-grade production standards
FAQ
What is ASTM B677 seamless pipe?
ASTM B677 is a specification covering seamless nickel alloy pipes and tubes for corrosive industrial applications.
What is the difference between UNS N08925 and N08926?
UNS N08926 contains higher molybdenum and nitrogen content, providing stronger chloride corrosion resistance compared with UNS N08925.
Is UNS N08354 suitable for seawater systems?
Yes. UNS N08354 (654 SMO) provides excellent seawater corrosion resistance and is widely used in marine engineering.
Can you provide custom pipe sizes?
Yes. We support customized OD, wall thickness and length according to project requirements.
Do you provide third-party inspection?
Yes. SGS, BV, TUV and DNV inspection services are available upon request.
What surface finishes are available?
Pickled, bright annealed, polished and customized industrial finishes are available.
What industries use ASTM B677 nickel alloy pipes?
These pipes are widely used in offshore engineering, chemical processing, FGD systems, oil & gas, heat exchangers and desalination systems.
Can you provide MTC EN 10204 3.1 certificates?
Yes. All ASTM B677 seamless pipes can be supplied with complete EN 10204 3.1 material test certificates.
Contact Us
Xi'an Dongmeng Group Co., Ltd
Professional Nickel Alloy Seamless Pipe Manufacturer & Exporter
Products: Nickel Alloy Pipe, Stainless Steel Pipe, Copper Alloy Products, Industrial Metal Materials
Phone / WhatsApp / WeChat: +8615769214734
Email: office@dongmjd.com
Contact us now for:
Technical datasheets
Factory quotations
Custom dimensions
Project solutions
Free sample consultation
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