ALLOY-400 (MONEL 400)

ALLOY-400 (Monel 400)

Corrosion Resistance
Chemical Composition
Mechanical properties
International Standard Comparision Chart Stock Form And Sizes
Round Bars
Hex Bars
Nuts And Washers
Spring Washer
Hex Bolt
Stud Bolt
Sourceable Materials


ALLOY400 is a single-phase solid-solution Ni-Cu alloy with excellent corrosion resistance to a wide range of media.

  • corrosion resistance in a wide range of marine and chemical environments
  • freedom from chloride induced stress-corrosion cracking
  • good mechanical properties from sub-zero temperatures up to about 550 °C (1020 °F)
  • approved for pressure vessels with wall temperatures from -10 to 425 °C (14 to 800 °F) according to VdTUV-Wbl. 263 and up to 900 °F (480 °C) according to ASME Boiler and Pressure Vessel Code.
  • good workability and weldability

Stock Form and Sizes

※ ◆1000㎜ ◎2000㎜ ▲3000㎜ ■3500㎜ ●4000㎜ ★2500㎜~3990㎜

Round BarsSpecification:ASTM B164/B564※ ASME SB164/SB564※ NACE MR0175(ISO 15156) ※B564/SB564 Apply to Forged Bar Only
size 1〜13
1.2 1.6 2 2.6 3 3.5 4 4.4 5 5.3 6 7.1 8 8.95 10 12 13
size 16〜50
16 18 19 20 22 24 25 28 30 32 35 36 38 40 42 45 50
size 55〜135
55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135
size 140〜300
140 145 150 155 160 165 170 180 190 200 210 220 230 250 280 300  
Hex barsSpecification: ASTM B164
10 13 14 17 19 21 22 24 26 27 30 32 36
Nuts and washersSpecification: Nut JIS B1181 Class1 Washer, JIS B1256 Normal Series Grade.A
M5 M6 M8 M10 M12 M16 M20

※Please enquire about grades and sizes not in stock.

Sourceable Ex-Stock Material for other Forms from Distributors World-Wide

Equivalent Round Bars Plate Pipe/Tube Welding Rod & Wire
Min Max Min Max
Monel 400 4.76~279.5 0.45〜76.2

*○: Various sizes available in stock. △: Only limited sizes available in stock. ☆: Please contact us for more details.
* We can supply materials and products that comply with various standards including ASTM, ASME, AMS, and NACE standards. Please contact us for more details.

Corrosion resistance

ALLOY400 has outstanding resistance to neutral and alkaline salt solutions. It has been a standard material for salt plants for many years. This alloy is one of the few metallic materials which can be used in contact with fluorine, hydrofluoric acid, hydrogen fluoride or their derivatives.
ALLOY400 shows very high resistance to caustic alkalies. Behaviour in seawater is also excellent, with improved resistance to cavitation corrosion compared with copper-base alloys. It can be used in contact with dilute solutions of mineral acids such as sulphuric and hydrochloric acids, particularly if they are air-free. However, as the alloy contains no chromium, corrosion rates may increase significantly under oxidizing conditions.
Whilst ALLOY400 can be considered immune to chlorideion stress cracking, it can stress crack in the presence of mercury or in moist aerated HF vapours. A stressrelieving heat treatment is applied in such cases.


Typical applications are:
  • feed-water and steam generator tubing in power plants
  • brine heaters and evaporator bodies in seawater desalination plants
  • sulphuric and hydrofluoric acid alkylation plants
  • sulphuric and hydrofluoric acid alkylation plants
  • cladding for crude oil distillation columns
  • splash-zone sheathing in offshore structures
  • propeller and pump shafts for seawater service
  • plants for uranium refining and isotope separation in the production of nuclear fuel
  • pumps and valves used in the manufacture of chlorinated hydrocarbons
  • monoethanolamine (MEA) reboiler tubes
  • valves and heat exchangers exposed to oxygen at higher temperatures, pressure and concentration of oxygen to avoid combustion and ignition through oxygen
  • sour gas environment: Nicorros is listed in NACE Standard MR0175 (“Sulfide Stress Cracking Resistant Metallic
    Materials for Oilfield Equipment”) as acceptable up to a maximum hardness value of 35 HRC

Chemical composition

  Ni Fe C Mn Si Cu Al S
min 63.0 1.0       28.0    
max   2.5 0.16 2.00 0.50 34.0 0.50 0.02

※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

Mechanical properties(Round Bar)

  Condition Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HB)
ASTM Min Value Soft Annealed 170 480 35  
Typical Values at RT Hot worked 490 637 45 190
Typical Values at RT Cold worked Stress Relieved 539 686 30 110
Typical Values at RT Soft Annealed 255 559 48 135

Above standard values and typical values of Round Bar.
Please contact us with any questions about reference or value of plate and pipe.
※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

International Standard Comparison Chart

  Material Round Bars Plate Pipe/Tube
Seamless Welded
B164 B127 B163/165  
ASME SB164 SB127 SB163/165  
JIS NW4400 H4553 H4551 H4552  
DIN 2.4360 17752 17750 17751  
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