Monel 400 Seamless Pipe Supplier | ASTM B165 UNS N04400 | SSMALLOYS

Looking for a reliable supplier of Monel 400 Seamless Pipe (UNS N04400 / 2.4360)?

SSMALLOYS supplies certified Monel 400 seamless pipes with competitive pricing, worldwide delivery, and full inspection documentation for marine, chemical, and offshore projects.

Monel 400 Seamless Pipe Chinese Supplier

SSMALLOYS specializes in supplying high-performance nickel alloy pipes and fittings for offshore, marine, chemical processing, and oil & gas industries.

Our Monel 400 seamless pipes are manufactured according to ASTM and ASME standards and are available with complete traceability and inspection documentation.

SSMALLOYS Advantages

ASTM B165 compliant production
Seamless pipe from NPS 1/8″ to 24″
EN 10204 3.1 Material Test Certificates
PMI verification before shipment
Third-party inspection available
Custom cut lengths
Global logistics support
Competitive project pricing
Technical support for material selection

Monel 400 seamless pipe is a nickel-copper alloy pipe known for its exceptional resistance to seawater, hydrofluoric acid, alkalis, and various corrosive environments. With a typical composition of approximately 67% nickel and 23% copper, Monel 400 offers outstanding corrosion resistance combined with good mechanical strength over a wide temperature range.

SSMALLOYS supplies Monel 400 seamless pipes manufactured according to ASTM and ASME standards for marine, chemical processing, oil & gas, and power generation industries worldwide.

Material Designations

Standard	UNS	W.Nr.	ASTM Pipe Standard	Alloy Name
Designation	N04400	2.4360 / 2.4361	ASTM B165	Monel 400

Chemical Composition

Typical composition:

Element	Content (%)
Nickel (Ni)	Min 63.0
Copper (Cu)	28.0 – 34.0
Iron (Fe)	Max 2.5
Manganese (Mn)	Max 2.0
Carbon (C)	Max 0.30
Silicon (Si)	Max 0.50
Sulfur (S)	Max 0.024

Mechanical Properties

Typical room-temperature properties:

Property	Value
Tensile Strength	≥ 550 MPa
Yield Strength	≥ 240 MPa
Elongation	≥ 35%
Density	8.80 g/cm³
Melting Range	1300–1350°C

Key Performance Characteristics

Excellent Seawater Corrosion Resistance

Monel 400 is one of the most widely used alloys for marine service because of its exceptional resistance to flowing seawater, salt spray, and marine atmospheric conditions.

Outstanding Hydrofluoric Acid Resistance

Unlike many stainless steels, Monel 400 performs exceptionally well in hydrofluoric acid service, making it a preferred material in chemical processing plants.

Good Resistance to Alkalis

The alloy offers excellent resistance to caustic soda and alkaline solutions across a wide concentration range.

Resistance to Stress Corrosion Cracking

Monel 400 is generally resistant to chloride-induced stress corrosion cracking, a common failure mode in austenitic stainless steels.

Wide Operating Temperature Range

Maintains useful mechanical properties from sub-zero temperatures up to approximately 550°C.

Full-service provider of Monel 400 seamless pipes for all your needs

SSM offers significant product advantages in the manufacture of monel 400 seamless pipes. Whether quality or price – we will meet your requirements.

Advantages of Monel 400 Seamless Pipe

✅ Excellent seawater resistance
✅ Outstanding resistance to hydrofluoric acid
✅ Good resistance to alkalis and salts
✅ Resistant to chloride stress corrosion cracking
✅ High strength and toughness
✅ Suitable for cryogenic applications
✅ Long service life in marine environments

Limitations

❌ Higher cost than stainless steel
❌ Not ideal for strongly oxidizing acids such as concentrated nitric acid
❌ Lower high-temperature strength than Inconel alloys
❌ More difficult to machine than carbon steel
❌ Long lead times for large project quantities

Monel 400 Products Available from SSMALLOYS

In addition to Monel 400 seamless pipe, SSMALLOYS also supplies:

Monel 400 Seamless Tube
Monel 400 Welded Pipe
Monel 400 Pipe Fittings
Monel 400 Flanges
Monel 400 Bars
Monel 400 Forgings
Monel 400 Fasteners

Available standards include:

ASTM B165
ASTM B725
ASTM B366
ASTM B564
ASTM B164

Monel 400 vs 316L Stainless Steel

Property	Monel 400	316L
Nickel Content	~67%	~10%
Seawater Resistance	Excellent	Moderate
Hydrofluoric Acid Resistance	Excellent	Poor
Chloride SCC Resistance	Excellent	Moderate
Cost	Higher	Lower
Service Life in Marine Systems	Longer	Shorter

For critical seawater applications, Monel 400 often provides substantially longer service life than 316L stainless steel.

Why Choose SSMALLOYS Monel 400 Seamless Pipe?

SSMALLOYS offers:

✔ ASTM B165 compliant manufacturing
✔ Seamless construction for critical services
✔ EN 10204 3.1 certification
✔ PMI testing available
✔ Third-party inspection by SGS, BV, TÜV, DNV, Lloyd’s
✔ Worldwide shipping
✔ Custom lengths and project packaging
✔ Competitive pricing for industrial projects

FAQs

What standard covers Monel 400 seamless pipe?

The most common manufacturing standard is ASTM B165.

What is the UNS number for Monel 400?

Monel 400 is designated as UNS N04400.

Is Monel 400 suitable for seawater service?

Yes. Monel 400 is one of the most widely used alloys for seawater and marine applications.

Can Monel 400 resist hydrofluoric acid?

Yes. Monel 400 has excellent resistance to hydrofluoric acid and is commonly used in HF service.

Is Monel 400 better than 316L stainless steel?

For seawater and hydrofluoric acid environments, Monel 400 generally provides superior corrosion resistance and longer service life.

Can SSMALLOYS provide PMI testing?

Yes. Positive Material Identification (PMI) testing can be provided before shipment.

Does SSMALLOYS provide EN 10204 3.1 certificates?

Yes. All Monel 400 seamless pipes can be supplied with EN 10204 3.1 certification.

Can SSMALLOYS arrange third-party inspection?

Yes. We can arrange inspections by SGS, Bureau Veritas, TÜV, DNV, Lloyd's Register, or customer-designated agencies.

More Resources:

https://en.wikipedia.org/wiki/Monel