Alloy 400 Pipe/Tube, Flanges, Fittings

Alloy 400 (UNS NO4400)


A nickel-copper alloy with high strength and excellent corrosion resistance in a range of media including sea water, hydrofluoric acid, sulfuric acid, and alkalies. Used for marine engineering, chemical and hydrocarbon processing equipment, valves, pumps, shafts, fittings, fasteners, and heat exchangers.

Standard Product Forms

Pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire.

Chemical Composition Wt,%

























































Density,g/ 8.8

Melting Range,℃ 1300-1350

Typical Mechanical Properties


Tensile Strength, ksi 80

Mpa 550

Yield Strength (0.2% Offset),ksi 35

Mpa 240

Elongation, % 40



Alloy 400 is a solid-solution binary. As nickel and copper are mutually soluble in all proportions. It is a single-phase alloy. It has a face-centered cubic lattice structure with a lattice parameter of 3.534 A.


Alloy 400, with an excellent combination property, is a corrosion resistent alloy in a wide range of use and applications. It has an excellent corrosion resistance in the media of hydrofluoric acid and fluorine and also a good corrosion resistance to hot strong alkali liquor. Besides it also resistant to corrosion in the neutral solution, water, sea water, air, organic compound etc..One important character of the alloy is that the stress corrosion cracking normally doesn't occur and it has a good machinability.

Corrosion Resistance

Alloy 400 exhibits resistance to corrosion by many reducing media. It is also generally to attack by oxidizing media than higher copper alloys. This versatility makes alloy 400 suitable for service in a variety of environment;

Alloy 400 is widely used in marine applications.While alloy 400 products exhibit very low corrosion rates in flowing seawater;

Stagnant conditions have been shown to induce crevice and pitting corrosion. Alloy 400 is a also resistant to stress corrosion cracking and pitting in most fresh and industrial water;

Alloy 400 offers exceptional resistance to hydrofluoric acid in all concentrations up to the boiling point;

It is perhaps the most resistant of all commonly used engineering alloys.Alloy 400 is also resistant to many forms of sulfuric and hydrochloric acids under reducing.


Alloy 400 is a material in a variety of applications, and is applied in many industrial areas.tubing

1. Feed-water and steam generator in power plants;

2. Brine heaters and evaporator bodies in seawater desalination plants;

3. Pumps and values used in the manufacture of chlorinated hydrocarbons;

4. Cladding for crude oil distillation columns;

5. Splash-zone sheathing in offshore structures;

6. Plants for uranium refining and isotope separation in the production of nuclear fuel;

7.Propeller and pump shafts for seawater service.


We have products:

Alloy K500 / UNS N05500 Nickel Alloy Tube For Oil And Gas Industry; ASTM A269 Welded Capillary Tube SS TP316L Downhle Tube For Oilfield Services; ASTM B725 Alloy 400 / UNS N04400 Nickel Alloy Welded Tube; ASTM B163 / B165 Alloy 400 / UNS N04400 Nickel Alloy Seamless Pipe; ASTM B564 / ASME SB564 Alloy 400 / N04400 Nickel Alloy Weld Neck Flange; ASTM B564 Alloy 600 / N06600 Nickel Alloy Socket Welding Flange; ASME SA366 Alloy 400 / UNS N04400 Nickel Alloy Weld Neck Flange For Connection; PN150 ASTM A366 Alloy K500 / UNS N05500 Nickel Alloy Socket Welding Flange; Alloy 400 / UNS N04400 Nickel Alloy Welded / Seamless Tubing For Crude Oil Stills; ASTM A829 Alloy 400 6000MM Nickel Alloy Steel Seamless Pipe; Stainless Steel Welding Heat Exchange Tube ASTM A213 For Air Condenser; TP316 Stainless Steel Straight Heat Exchange Tube, ASTM A213 For Chemical Equipment; ASTM A213/269 Heat Exchange Stainless Steel Tubing With A&P Surface For Pressure Vessel; TP321/321H 19.05mm Stainless Steel Tubing Cold Rolled For Boiler; Duplex Steel S31803 31.8mm Seamless/ Welded U Bend Tubing For Desalination; S31803 Duplex Steel Heat Exchanger Tube With Annealed&Pickling Surface; S31803/2205 ASTM A789 Heat Exchanger Seamless /Welded Tube For Petroleum Refining; Petroleum Refining Used S31803/32750 Heat Exchanger Tube; 25.4mm Cold Rolled U Bend Tube Duplex Steel For Heat Exchanger; 25.4mm Cold Rolled S31803 Tube Desalination Used Duplex Steel For Heat Exchanger; Instrumentation Used Nickel Alloy 825/625 Heat Exchange U Tube; Cold Rolled Nickel Alloy Heat Exchange Seamless U Tube With Annealed; Heat Exchange Tube Nickel Alloy 625/825 For Chemical Equipment with BA/AP Surface; Nickel Alloy Cold Rolled Heat Exchange Tube Alloy 625/UNS N06625 For Pressure Vessel; 19.05mm Cold Rolled U Bend Tube Nickel Alloy Seamless For Heat Exchanger; Chemical Equipment Used 31.8mm Cold Rolled Nickel Alloy Straight/ U Bend Tube Corrosion Resistance; Alloy 400/600 Nickel Alloy Heat Exchanger U Bend Tube With Annealed Surface; Alloy 400/600 Nickel Alloy U Bend/Straight Heat Exchange Tube Annealed Surface; Monel 400 Sheet, UNS N04400 Nickel Alloy 400 Sheet/Plate;
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