Introduction
ASME SB163 Monel 400 Seamless Tube (UNS N04400) is a nickel-copper alloy tube well known for its excellent resistance to seawater, steam, acids, and alkaline media. DLSS supplies seamless tubes in size 25 mm OD × 2 mm WT × 8975 mm length, manufactured to ASME SB163 standards.
These tubes are supplied with a bright surface finish, ensuring smoothness and enhanced corrosion resistance. Every tube undergoes 100% Hydrostatic Test (HT), Eddy Current Test (ET), and Ultrasonic Test (UT), guaranteeing defect-free performance for critical applications such as heat exchangers, condensers, and marine cooling systems.
What is Monel 400 (UNS N04400)?
Monel 400 is a solid-solution alloy of nickel and copper with typical composition:
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Nickel (≥63%)
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Copper (28–34%)
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Trace amounts of Fe and Mn
Key properties include:
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Outstanding resistance to seawater and steam at high temperatures
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Excellent performance in hydrofluoric acid, sulfuric acid, and alkaline solutions
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High toughness and strength across a wide temperature range
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Non-magnetic and stable in both sub-zero and high-temperature service
Specifications
| Item | Details |
|---|---|
| Standard | ASME SB163 |
| Material | Monel 400 (UNS N04400) |
| Type | Seamless Tube |
| Size | 25 mm OD × 2 mm WT × 8975 mm Length |
| Surface Finish | Bright Surface |
| Testing | 100% HT (Hydrostatic), ET (Eddy Current), UT (Ultrasonic) |
| Applications | Heat exchangers, condensers, marine cooling, chemical processing, power plants |
Key Features
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Bright Surface Finish – smooth, oxide-free surfaces reduce fouling and improve corrosion resistance.
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Seamless Construction – reliable strength and leak-proof performance.
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100% NDT Testing – hydrostatic, eddy current, and ultrasonic tests ensure safety.
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Superior Corrosion Resistance – resists seawater, acids, and alkaline solutions.
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Durable & Versatile – widely used in marine, chemical, and energy industries.
Applications
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Heat Exchangers & Condensers – for corrosive and seawater environments.
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Marine Engineering – shipboard condensers, seawater cooling, offshore equipment.
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Oil & Gas Industry – sour gas systems, offshore piping, refinery applications.
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Chemical Processing – hydrofluoric acid, caustic soda, sulfuric acid handling.
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Power Generation – cooling systems and boiler feedwater heaters.
Why Choose DLSS?
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Supplier of nickel alloy tubes: Monel, Inconel, Incoloy, Hastelloy.
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Strict QC – 100% HT/ET/UT + PMI + dimensional checks.
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Third-Party Inspection – SGS, BV, TUV available.
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Export Packaging – capped, plastic wrapped, ISPM-15 wooden cases.
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Global Projects – supplied to refineries, desalination, offshore, and power plants.
Frequently Asked Questions (FAQ)
Q1: Why is Monel 400 suitable for marine condensers?
A1: It resists seawater corrosion, biofouling, and erosion, ensuring long-term reliability.
Q2: Why perform HT/ET/UT on every tube?
A2: To ensure the tubes are leak-proof, free from cracks, and safe for high-pressure service.
Q3: Can DLSS supply Monel 400 in other dimensions?
A3: Yes, we provide tubes and pipes in customized sizes, including U-bend and heavy-wall types.
Q4: What certifications are available?
A4: MTC EN 10204/3.1, with optional SGS/BV/TUV third-party inspections.
