What Is Monel 400 Alloy Seamless Steel Pipe?

Monel 400 (UNS N04400) is a nickel-copper alloy that offers excellent corrosion resistance, toughness, and strength over a wide temperature range. Pipe manufactured in accordance with ASME SB-165 is seamless (SMLS) pipe, ensuring excellent leak-tightness, mechanical integrity, and pressure resistance. It is widely used in marine environments, chemical processing, and the oil and gas industry, where resistance to seawater and acid is critical.

 

Applications of Monel 400 Seamless Pipes

Offshore piping and seawater systems

Heat exchangers and condensers

Chemical process piping (alkali and acid service)

Oil and gas pipelines

Pressure vessels and evaporators

Nuclear and aerospace equipment

 

Gnee offers Monel 400 seamless pipe in a variety of sizes, wall thicknesses, and surface finishes. All products are ISO 9001, SGS, and BV quality certified and are in stock for quick delivery.

Monel 400 Alloy Seamless Pipe Data Sheet

Category	Specification
Standard	ASTM B165 / ASME SB-165
Material Grade	Monel 400 / UNS N04400
Type	Seamless (SMLS) Nickel-Copper Alloy Pipe
Chemical Composition (% by weight)	Ni: ≥63, Cu: 28–34, Fe: ≤2.5, Mn: ≤2, Si: ≤0.5, C: ≤0.3, S: ≤0.024
Tensile Strength	≥550 MPa
Yield Strength	≥240 MPa
Elongation	≥30%
Temperature Range	–196°C to 480°C
Outer Diameter (OD)	6 mm – 219 mm
Wall Thickness	0.5 mm – 22 mm
Length	6 m standard or custom cut lengths
Surface Finish	Bright Annealed (BA), Pickled, Polished
End Type	Plain End (PE), Beveled End (BE)
Testing & Inspection	PMI, Ultrasonic Test (UT), Radiographic Test (RT), Hydrostatic Test

 

Can Monel 400 withstand seawater corrosion?
Yes, Monel 400 has superior resistance to seawater and chloride-induced corrosion compared to stainless steel.

 

Is Monel 400 weldable?
Yes. It can be welded using TIG, MIG, and resistance welding methods. Monel 60 filler wire is recommended for optimum results.

 

What pressure can Monel 400 seamless pipes handle?
Depending on diameter and wall thickness, Monel 400 SMLS pipes can withstand pressures up to 6000 psi (≈41 MPa) under ASME design standards.

 

What certifications come with Gnee's Monel 400 pipes?
Gnee provides EN 10204 3.1 MTC, along with PMI, UT, RT, and hydrostatic test reports, as well as dimensional inspection sheets and production photos. Email: sales@gneestainless.com

 

If you are sourcing ASTM B165 / ASME SB-165 Monel 400 alloy seamless steel pipes, Gnee offers ready stock, certified quality, and worldwide delivery.Our Monel 400 SMLS pipes are ideal for marine, chemical, oil & gas, and high-temperature applications. Contact Gnee today for technical support, quotation, and custom fabrication.

Feature	Gnee Advantage
Quality Certification	ISO 9001, SGS, BV approved
Inspection Coverage	100% PMI, UT, Eddy Current, Hydrostatic test
Processing Capabilities	Cutting, polishing, threading, bending
Delivery Time	7–15 working days depending on order size
Packaging	Seaworthy wooden crates, anti-corrosion wrapping
Payment Options	T/T, L/C, D/P, and other flexible terms
Trade Terms	EXW, FOB, CIF, DDU available
After-Sales Service	Technical support and third-party inspection on request