Monel

Monel 400 Pipe & Tube

Corrosion-Resistant Nickel-Copper UNS N04400 Seamless & Welded Pipes, Heat Exchanger Tubes, and Capillary Tubing

Grade Monel 400 / Alloy 400 (UNS N04400, Werkstoff 2.4360, W.Nr 2.4361, NiCu30Fe, AWS 040)
Standard ASTM B165, ASME SB165, ASTM B163, ASME SB163, ASTM B725, ASTM B730, ASTM B775, ASTM B829, AMS 5580, BS 3074, DIN 17751, NACE MR0175 / ISO 15156
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Product Overview

Om Export India Pvt Ltd is a leading manufacturer, stockist, and global exporter of high-grade Monel 400 Pipes and Tubes (UNS N04400 / Werkstoff 2.4360 / Alloy 400). Monel 400 is a ductile, solid-solution nickel-copper binary alloy containing a minimum of 63% Nickel and 28% to 34% Copper. It is renowned for its exceptional resistance to a vast spectrum of corrosive media, including high-velocity seawater, hydrofluoric acid, sulfuric acid, alkalies, and chloride-induced stress corrosion cracking.

Manufactured to ASTM B165, ASME SB165, ASTM B163, and AMS 5580 standards, our Monel 400 seamless and welded pipes retain mechanical strength and structural toughness from cryogenic sub-zero levels up to elevated operating temperatures of 1000°F (538°C). The alloy cannot be hardened via thermal treatment and is hardened exclusively through controlled cold working, making it an optimal selection for marine process piping, offshore drill systems, crude oil distillation columns, and chemical process reactors.

  • Marine Corrosion Immunity: High resistance to turbulent seawater impingement, cavitation, and marine biofouling.
  • Sub-Zero to High-Temperature Toughness: Retains high impact toughness at cryogenic temperatures with continuous operational capability up to 1000°F.
  • Chemical Processing Resistance: Resists non-oxidizing acids, hydrofluoric acid alkylation environments, and boiling caustic soda solutions.

Key Features

  • Hydrofluoric Acid Resistance: High resistance to all concentrations of HF acid up to the boiling point in non-aerated environments.
  • Cryogenic Toughness: Retains high ductility and tensile strength at sub-zero and cryogenic temperatures without experiencing a ductile-to-brittle transition.
  • High Thermal & Mechanical Stability: Operates under continuous pressure up to 1000°F (538°C).
  • Stress Corrosion Resistance: Virtually immune to chloride-ion stress corrosion cracking in heavy marine and caustic environments.
  • Dimensional Precision: Precision cold drawing ensures OD tolerances within ±0.05 mm to ±0.1 mm for expanded joint integrity.
  • Fabrication & Weldability: Readily weldable via GTAW (TIG) and GMAW (MIG) processes using matching AWS ERNiCu-7 (Monel 60) filler metals.

Product Specifications

Specification Parameter Standard Specification / Technical Value
Seamless Pipe Size Range 1/8" NB to 8" NB (Outer Diameter: 6.0 mm to 203.2 mm OD)
Welded / EFW Size Range 1/2" NB to 48" NB (Outer Diameter: 5.0 mm to 1219.2 mm OD)
Wall Thickness & Schedules SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, SCH XXS (0.3 mm to 50.0 mm WT)
Manufacturing Standards ASTM B165, ASME SB165, ASTM B163, ASME SB163, ASTM B725, AMS 5580, DIN 17751
Heat Treatment & Delivery State Annealed (Soft Condition M), Stress Relieved (300°C–320°C), Spring Temper / Hard Drawn (Y)
Standard Lengths Single Random, Double Random, Standard 6-Meter, Straight Lengths up to 20 Meters (65 ft)
Surface Finishes Annealed & Pickled (AP), Bright Annealed (BA), Electropolished (4 µin / 0.1 µm Ra), As Drawn (16 µin / 0.4 µm Ra)
End Configurations Plain Square Cut End (PE), Beveled End (BE 30° / 37.5° per ASME B16.25), Threaded & Coupled

Dimensions & Sizes

Nominal Pipe Size (NPS) Outside Diameter (OD mm / in.) Wall Thickness (WT mm / in.) Nominal Schedule Weight (kg/m) Weight (lb/ft)
1/8" NB 10.29 mm (0.405") 1.24 mm (0.049") SCH 10S 0.28 kg/m 0.19 lb/ft
1/8" NB 10.29 mm (0.405") 1.73 mm (0.068") SCH 40S 0.37 kg/m 0.25 lb/ft
1/8" NB 10.29 mm (0.405") 2.41 mm (0.095") SCH 80S 0.48 kg/m 0.32 lb/ft
1/4" NB 13.72 mm (0.540") 1.65 mm (0.065") SCH 10S 0.50 kg/m 0.34 lb/ft
1/4" NB 13.72 mm (0.540") 2.24 mm (0.088") SCH 40S 0.64 kg/m 0.43 lb/ft
1/4" NB 13.72 mm (0.540") 3.02 mm (0.119") SCH 80S 0.81 kg/m 0.54 lb/ft
1/2" NB 21.34 mm (0.840") 2.11 mm (0.083") SCH 10S 1.02 kg/m 0.68 lb/ft
1/2" NB 21.34 mm (0.840") 2.77 mm (0.109") SCH 40S 1.29 kg/m 0.85 lb/ft
1/2" NB 21.34 mm (0.840") 3.73 mm (0.147") SCH 80S 1.65 kg/m 1.09 lb/ft
3/4" NB 26.67 mm (1.050") 2.11 mm (0.083") SCH 10S 1.30 kg/m 0.87 lb/ft
3/4" NB 26.67 mm (1.050") 2.87 mm (0.113") SCH 40S 1.71 kg/m 1.13 lb/ft
3/4" NB 26.67 mm (1.050") 3.91 mm (0.154") SCH 80S 2.23 kg/m 1.48 lb/ft
1" NB 33.40 mm (1.315") 2.77 mm (0.109") SCH 10S 2.13 kg/m 1.43 lb/ft
1" NB 33.40 mm (1.315") 3.38 mm (0.133") SCH 40S 2.54 kg/m 1.68 lb/ft
1" NB 33.40 mm (1.315") 4.55 mm (0.179") SCH 80S 3.29 kg/m 2.17 lb/ft
1-1/2" NB 48.26 mm (1.900") 2.77 mm (0.109") SCH 10S 3.16 kg/m 2.12 lb/ft
1-1/2" NB 48.26 mm (1.900") 3.68 mm (0.145") SCH 40S 4.11 kg/m 2.72 lb/ft
1-1/2" NB 48.26 mm (1.900") 5.08 mm (0.200") SCH 80S 5.49 kg/m 3.63 lb/ft
2" NB 60.33 mm (2.375") 2.77 mm (0.109") SCH 10S 3.99 kg/m 2.64 lb/ft
2" NB 60.33 mm (2.375") 3.91 mm (0.154") SCH 40S 5.52 kg/m 3.66 lb/ft
2" NB 60.33 mm (2.375") 5.54 mm (0.218") SCH 80S 7.60 kg/m 5.03 lb/ft
2" NB 60.33 mm (2.375") 8.74 mm (0.344") SCH 160 11.29 kg/m 7.47 lb/ft
3" NB 88.90 mm (3.500") 3.05 mm (0.120") SCH 10S 6.56 kg/m 4.34 lb/ft
3" NB 88.90 mm (3.500") 5.49 mm (0.216") SCH 40S 11.47 kg/m 7.58 lb/ft
3" NB 88.90 mm (3.500") 7.62 mm (0.300") SCH 80S 15.51 kg/m 10.26 lb/ft
4" NB 114.30 mm (4.500") 3.05 mm (0.120") SCH 10S 8.50 kg/m 5.62 lb/ft
4" NB 114.30 mm (4.500") 6.02 mm (0.237") SCH 40S 16.32 kg/m 10.80 lb/ft
4" NB 114.30 mm (4.500") 8.56 mm (0.337") SCH 80S 22.67 kg/m 15.00 lb/ft
6" NB 168.28 mm (6.625") 3.40 mm (0.134") SCH 10S 14.04 kg/m 9.30 lb/ft
6" NB 168.28 mm (6.625") 7.11 mm (0.280") SCH 40S 28.69 kg/m 18.99 lb/ft
6" NB 168.28 mm (6.625") 10.97 mm (0.432") SCH 80S 43.21 kg/m 28.60 lb/ft
8" NB 219.08 mm (8.625") 3.76 mm (0.148") SCH 10S 20.27 kg/m 13.62 lb/ft
8" NB 219.08 mm (8.625") 8.18 mm (0.322") SCH 40S 43.20 kg/m 28.55 lb/ft
8" NB 219.08 mm (8.625") 12.70 mm (0.500") SCH 80S 65.63 kg/m 43.39 lb/ft

Chemical Composition

Element ASTM B165 / UNS N04400 Composition (%) Werkstoff 2.4360 Composition (%)
Nickel (Ni) 63.00 Min (Plus Cobalt) 63.00 Min
Copper (Cu) 28.00 – 34.00 28.00 – 34.00
Iron (Fe, Max) 2.50 2.50
Manganese (Mn, Max) 2.00 2.00
Carbon (C, Max) 0.30 0.15
Silicon (Si, Max) 0.50 0.50
Sulfur (S, Max) 0.024 0.020

Mechanical Properties

Material Condition / Temper Tensile Strength (MPa / ksi) Yield Strength 0.2% Offset (MPa / ksi) Elongation in 2 in. (%) Hardness (Rockwell / Brinell)
Annealed Seamless (ASTM B165) 480 – 620 MPa (70 – 90 ksi) 195 – 345 MPa (28 – 50 ksi) 35% – 50% 60 – 80 HRB (110 – 149 HBW)
Stress Relieved / Cold Drawn 585 – 760 MPa (85 – 110 ksi) 380 – 585 MPa (55 – 85 ksi) 15% – 30% 85 – 98 HRB (160 – 220 HBW)
Spring Temper / Hard Drawn 850 – 1050 MPa (123 – 152 ksi) 690 – 930 MPa (100 – 135 ksi) 2% – 10% 20 – 30 HRC
Density & Melting Point Density: 8.80 g/cm³ (0.318 lb/in³) Melting Point: 1350°C (2460°F) Thermal Exp: 13.9 µm/m·°C

Standards & Specifications

Governing Organization Standard Designation Scope & Product Type
ASTM / ASME ASTM B165 / ASME SB165 Nickel-Copper Alloy (UNS N04400) Seamless Pipe and Tube
ASTM / ASME ASTM B163 / ASME SB163 Seamless Nickel and Nickel Alloy Condenser and Heat Exchanger Tubes
ASTM / ASME ASTM B725 / ASME SB725 Welded Nickel-Copper Alloy (UNS N04400) Pipe
Aerospace Standard AMS 5580 Nickel-Copper Alloy Seamless Tubing
British Standard (BS) BS 3074 / NA 13 Nickel and Nickel Alloys: Seamless Tube and Pipe Specification
German Standard (DIN) DIN 17751 / Werkstoff 2.4360 Tubes of Wrought Nickel and Nickel-Copper Alloys (NiCu30Fe)
Oil & Gas Standard NACE MR0175 / ISO 15156 Materials for use in H2S-containing environments in oil and gas production

Applications

Monel 400 seamless and welded piping systems are deployed across mission-critical marine, hydrocarbon, and chemical processing plants:

  • Marine & Naval Engineering: High-pressure seawater cooling piping, marine fixture valves, pump shafts, propeller sleeves, and submarine plumbing systems.
  • Chemical Processing Plants: Hydrofluoric (HF) acid alkylation units, chlorinated hydrocarbon processing, sulfuric acid handling lines, and caustic evaporation units.
  • Oil & Gas Refining: Crude oil distillation tower overhead piping, splash zone platform piping, sour gas conduits, and downhole drill string sleeves.
  • Heat Exchangers & Condensers: Power plant feedwater heaters, chemical reboilers, and shell-and-tube marine condensers using finned and U-bent tubes.
  • Nuclear & High-Purity Applications: Uranium enrichment piping, boiler feed pump impellers, and high-purity salt production equipment.

Frequently Asked Questions

Q1: What gives Monel 400 superior resistance in seawater applications?
Monel 400 forms a highly stable, adherent protective oxide film in marine environments. It exhibits low corrosion rates in turbulent, high-velocity seawater and resists pitting, cavitation, and chloride-induced stress corrosion cracking.

Q2: Can Monel 400 pipes be hardened through heat treatment?
No, Monel 400 is a single-phase solid-solution alloy and cannot be hardened by thermal treatment. Increased strength and hardness are achieved through cold working (drawing, rolling) followed by stress-relief annealing.

Q3: Why is cleanliness critical when processing Monel 400 pipes?
Monel 400 is susceptible to embrittlement by sulfur and low-melting metals (such as lead, zinc, and tin) during high-temperature fabrication or welding. Surface contaminants like grease, oil, and marking inks must be removed before heating.

Q4: What certifications are provided by Om Export India Pvt Ltd for Monel 400 products?
All orders include EN 10204 Type 3.1 / 3.2 Material Test Certificates, Spectro Chemical Analysis, 100% Radiography / Ultrasonic test reports, and compliance with NACE MR0175 / ISO 15156.

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