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ASTM B725 Monel 400 Welded Pipe

The chemical composition of Monel 400 alloy (UNS N04400, MCu-28-1.5-1.8 or Ni68Cu28Fe) is mainly composed of 30% Cu and 65% Ni plus a small amount of Fe (1%-2%). The structure is a typical single-phase austenite structure. Since nickel and copper are mutually soluble in any ratio, there is generally no intermetallic phase precipitation.

Monel400 observes the structure of this alloy under non-etching conditions under a metallographic microscope. It can be seen that there are very dispersed non-metallic inclusions on the austenite matrix, such as sulfides and silicates. Under certain conditions, carbides can also be observed.
  • Monel 400 (UNS N04400) Welded Pipes & Tubes
Technical Data Sheet of Alloy Welded Pipe
Product Name

Monel 400 (UNS N04400, W.Nr. 2.4360) Welded Pipes & Tubes

Equivalent Materials Monel®400 alloy 400, UNS N04400, W.Nr. 2.4360 and 2.4361, NA13, NiCu30Fe
Type  Welded
Shape Square / Rectangular / Round / Special-shaped
Executive Standard ASTM B725 (Welded Pipe), ASTM B730 (Welded Tube), ASTM B751 (Welded Tube), ASTM B775 (Welded Pipe), ASME SB725 (Welded Pipe), ASME SB730 (Welded Tube), ASME SB751 (Seamless and Welded Tube), ASME SB775 (Seamless and Welded Pipe)
Available Grades

Stainless steel 301 / 302 / 303 / 304 / 304L / 310S / 316L / 316Ti / 316LN / 317L / 904L / 2205 / 2507 / 321 / 32760 / 253MA / 254SMo / 410 / 420 / 430 / Custom465 / XM-19 / S31803 / S32750 / S32205 / F50 / F60 / F55 / F60 / F61 / F65

Nitronic 30 / Nitronic 32 / Nitronic 33 / Nitronic 40 / Nitronic 50 / Nitronic 60  etc..

Monel 400 / Monel K-500 
Inconel 600 / Inconel 601 / Inconel 625 / Inconel 617 / Inconel 690 / Inconel 718 / Inconel X-750 / Inconel 713C / Inconel 713LC
Incoloy A-286 / Incoloy 800 / Incoloy 800H / Incoloy 800HT
Incoloy 825 / Incoloy 901 / Incoloy 925 / Incoloy 926
Nimonic 75 / Nimonic 80A / Nimonic 90 / Nimonic 105 / Nimonic C263 / L-605
Hastelloy B / Hastelloy B-2 / Hastelloy B-3 / Hastelloy C / Hastelloy C-276 / Hastelloy C-22
Hastelloy C-4 / Hastelloy C-2000 / Hastelloy G-35 / Hastelloy X / Hastelloy N
PH stainless steel 15-5PH / 17-4PH / 17-7PH 
Out diameter  Welded Pipe 1.9mm - 5000mm or customized
Thickness  Welded Pipe 0.5mm - 80mm or customized
Max Length Welded Pipe 50000mm or customized
Finish  2B, Pickling, Polished, Brushed, Sandblast, BA, EP
Packing  waterproof polybag, wooden box, end cap, wooden crame/pallet
Inspection  TUV,SGS,BV,ABS,LR and so on

Chemical, Pharmaceutical & Bio-Medical, Petrochemical & Refinery, Environmental, Food Processing, Aviation, Chemical Fertilizer, Sewage Disposal, Desalination, Waste Incineration etc. 

Processing Service  Machining : Turning / Milling / Planing / Drilling / Boring / Grinding / Gear Cutting / CNC Machining  
Deformation processing :  Bending / Cutting / Rolling / Stamping
Delivery Time 7-40 days
Payment T/T, L/C,D/A,D/P, Western Union,MoneyGram,According to customer requirements payments for offline orders.
Transportation By air, by sea, by train, by truck
Sample Free
Warranty Trade assurance after sales service

Detailed introduction of Monel®400 alloy 400 Welded Pipes

Monel400 copper-nickel alloy has low strength in the annealed state, therefore, it exhibits a higher degree of strength in the rolled state. Monel400 alloy is a corrosion-resistant copper-nickel alloy with good ductility. Monel400 alloy is widely used in oxidizing, neutral and reducing environments. It is also used in underwater environments and non-oxidizable chloride solutions. Monel400 copper-nickel alloy (UNSN04400) is a soft copper-nickel alloy that has the ability to withstand various corrosive environments. The alloy is often named for use in mild oxidizing environments, neutral environments, and gradually weakening environments. Another application area is in the marine environment and other non-oxidizing chloride solutions.

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Overview of Monel 400 (UNS N04400) Welded Pipes & Tubes:

Monel400 is a deformable nickel-copper nickel-based alloy, which has good seawater corrosion resistance and chemical corrosion resistance, and strong chloride stress corrosion cracking resistance. This alloy is one of the few alloys that can be used in fluoride. It has good resistance to oxide stress cracking corrosion in hydrofluoric acid and fluorine gas medium, such as sea water and salt water environment.

In medium concentration alkaline and salt solutions, Monel 400 also has very good corrosion resistance.

In a colder alkaline environment, the alloy is used in a weak acid environment such as sulfur and hydrogen fluoride.

Acid medium: Monel400 is corrosion resistant in sulfuric acid with a concentration of less than 85%. Monel400 is one of the few important materials that can withstand hydrofluoric acid.

Water corrosion: Under most water corrosion conditions, Monel400 alloy not only has excellent corrosion resistance, but also pitting corrosion and stress corrosion are rarely found, and the corrosion rate is less than 0.025mm/a.

High temperature corrosion: The highest temperature of Monel 400 continuous working in the air is generally around 600 ℃, in high temperature steam, the corrosion rate is less than 0.026mm/a. Ammonia: Due to the high nickel content of Monel 400 alloy, it can withstand corrosion under anhydrous ammonia and ammoniating conditions below 585°C.

Supporting welding materials and welding process: It is recommended to use AWS A5.14 welding wire ERNiCu-7 or AWS A5.11 welding rod EniCrCu-7 for welding of MONEL 400 alloy. The welding material size is Φ2.4, 3.2, 4.0, and the place of origin is: American SMC and Deutsche Nickel, welding process and instructions are welcome to call to obtain.

Executive standards: ASTM B 164 (rods, wires), ASTM B 564 (forgings), ASTM B 127 (plates, strips), ASTM B 165 (seamless pipes).

Chemical Composition of ASTM B730 Monel UNS N08400 Welded Tubes:

C Si Mn Ni Cu Fe
≤0.3 ≤0.50 S1.50 63~67 28~34 s2.0

Physical Properties of Monel 400 Alloy UNS N04400 ERW Pipes:

magnetic Thermal conductivity Resistivity Specific heat capacity Linear expansion coefficient
24.048-48 24 0.51-0.477 0.51-0.477 0.51-0.67

Mechanical Properties of ASME SB725 Monel Alloy 400 Welded Pipes:

Variety Status
Tensile StrengthZbMPa Elongation AV% HardnessHRB
Hot rod Hot processing state ≤54 551-757 60-30 75-100
>54 516-689 50-30 72-90
Cold rolled plate annealed
517-585 55-35 ≤68

689-964 15-2 ≥98

Application of ASTM B775 Monel 400 Nickel Alloy Welded Pipe:

Welding copper-nickel alloy-Monel series materials. Mainly used in marine engineering, salt industry, evaporators, condensers, sulfuric acid and hydrofluoric acid equipment, marine heat exchangers, seawater desalination equipment, salt production equipment, marine and chemical processing equipment, propeller shafts and water pumps, gasoline and water tanks, etc.

For more information about Monel 400 Alloy (UNS N04400) Welded Pipes and Tubes, please call +86-731-82250427 or send an Email to []

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PH Stainless Steel
Phones+86-17708476248 / 0731-82250427
Address: Room 2505-2508, 25th floor, C3 Building, Wanda Plaza, Kaifu District, Changsha, Hunan Province, China


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