What You Need to Know About Monel Alloy 400 Rod

What You Need to Know About Monel Alloy 400 Rod
Monel 400 alloy rod is a nickel-copper alloy renowned for its exceptional corrosion resistance, high strength, and superior toughness across a wide temperature range, particularly in marine and chemical environments. This solid-solution alloy, hardened by cold work, is well-suited for applications such as pump shafts, marine fittings, fasteners, and chemical processing equipment. Its ability to maintain mechanical properties at sub-zero temperatures and its strong resistance to acids and alkalis make it a key material in industries such as aerospace, offshore engineering, and nuclear power.
What is the maximum operating temperature of Monel 400?
Hot working temperatures range from 1700°F to 2150°F. Optimum working temperature is approximately 2000°F. By properly controlling the amount of hot working and/or cold working and selecting the appropriate heat treatment method, a wide range of mechanical properties can be achieved in the finished product.

Monel 400 round bar/Alloy 400 round bar offers good corrosion resistance, excellent weldability, and high strength. Monel 400 flat bar, Monel 400 hexagonal bar, and Monel 400 square bar are designated UNS N04400, with the work number 2.4360. Alloy 400 round bar is also known as Monel 400 round bar, Monel 400 alloy round bar, and Nickel Alloy 400 round bar. These Monel 400 forged bars, Monel 400 welding rods, and Monel 400 hollow bars are particularly resistant to hydrochloric and hydrofluoric acid corrosion after degassing. Monel 400 bar and Nickel 400 bar will corrode in sulfur-containing gases at temperatures exceeding approximately 700°F (approximately 327°C), while molten sulfur will attack the alloy at temperatures exceeding approximately 500°F (approximately 177°C).
Monel 400 round bar Specification
| Monel 400 round bar Specification: |
| AMS Number | Alloy | Type | UNS | Cross Ref. Spec | Misc./Shape |
|---|---|---|---|---|---|
| AMS 4675 Bar | Monel 400 | Nickel Copper | N04400 | ASTM B 164 | Bar |
| Grade | Monel 400 – UNS N04400 |
|---|---|
| Specification | ASTM B164 UNS N04400 |
| Monel 400 Round bar size | Diameter: 3mm~800mm |
| Monel 400 Angle bar size | 3mm*20mm*20mm~12mm*100mm*100mm |
| Monel 400 Square bar size | 4mm*4mm~100mm*100mm |
| Monel 400 Flat bar size | Thickness: 2mm~100mm |
| Width: 10mm~500mm | |
| Monel 400 Hex Bar size | 2mm~100mm |
| Monel 400 Billet Size | 1/2″ to 495mm Diameter |
| Monel 400 Rectangles Size | 33mm x 30mm to 295mm x 1066mm |
| Monel 400 Round Bar Standard Dimensions | As the customer required |
| Finish | Bright, Polish, Bright, Rough Turned, Grinding, Centreless Ground & Black |
| Tolerance | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients' requirements |
| Surface | Hot Rolled Pickled or Sand Blasting Finished, Cold Drawn, Bright, Polished, Hairline |
| Condition | Cold Drawnd Pulished Cold Drawn Centreless Ground & Polished, Annealed round bar |
| Technique | Monel 400 Hot Rolled, Cold Rolled, Cold Drawn, Forged Round Bar, Rod |
| Monel 400 Bar Type | Drawn Bar, Rolled Bar, Forged Bar, GFM Forged Bar, Open Die Bar, Forged Stepped Shafts, Forged Flat Bar, Forged Square Bar |
| Also Check price list of | Inconel Round Bar, Inconel 625 Round Bar, Inconel 718 Round Bar, Hastelloy Round Bar, Monel Round Bar, Titanium Round Bar, Copper Nickel Bar, Stainless Steel Round Bar |
| Form | Round, Rod, Precision Ground Bar, Square, Round Rod, Hollow, Hex (A/F), Triangle, Rectangle, Threaded, T-Bar, Half Round Bar, Flat Bar, Rings, Blocks, Billet, Ingot, I/H Bar, Angle, Channel Bar, Profiles, Forging Etc. |
ASTM B164 Monel 400 Bar Equivalent Grades
| ASTM B164 Monel 400 Bar Equivalent Grades: |
| STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN |
|---|---|---|---|---|---|---|---|
| Monel 400 | 2.4360 | N04400 | МНЖМц 28-2,5-1,5 | NU-30M | NW 4400 | NA 13 | NiCu30Fe |
Monel Alloy 400 Round, Bright, Hex, Threaded Bar Chemical Composition
| Monel Alloy 400 Round, Bright, Hex, Threaded Bar Chemical Composition: |
| Grade | Ni | Fe | C | Mn | Si | Cu | Al | S |
|---|---|---|---|---|---|---|---|---|
| Monel 400 | 63.0 min | 1.0 – 2.5 | 0.3 max | 2.0 max | 0.5 max | 28.0 – 34.0 | 0.50 max | 0.02 max |
Monel Alloy 400 Round Bars Mechanical Properties
| Monel Alloy 400 Round Bars Mechanical Properties: |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|---|---|
| 8.8 g/cm3 | 1350 °C (2460 °F) | Psi – 80000 , MPa – 550 | Psi – 35000 , MPa – 240 | 40 % |
Alloy 400 Bar Physical Constants and Thermal Properties
| Property | Imperial Units | Metric Units |
|---|---|---|
| Density | 0.318 lb/in³ | 8.80 g/cm³ |
| Melting Range | 2370 – 2460 °F | 1300 – 1350 °C |
| Specific Heat | 0.102 Btu/lb·°F | 427 J/kg·°C |
| Curie Temperature | 70 – 120 °F | 20 – 50 °C |
| Coefficient of Expansion (70–200°F / 21–93°C) | 7.7 × 10⁻⁶ in/in·°F | 13.9 µm/m·°C |
| Thermal Conductivity | 151 Btu·in/ft²·h·°F | 21.8 W/m·°C |
| Electrical Resistivity | 329 ohm·circ mil/ft | 0.547 µΩ·m |
400 Round Bars Typical Mechanical Properties (Annealed)
| Property | Imperial Units | Metric Units |
|---|---|---|
| Tensile Strength | 80 ksi | 550 MPa |
| Yield Strength (0.2% Offset) | 35 ksi | 240 MPa |
| Elongation | 40% | - |

Monel 400 Black Round Bar Stock
| Monel 400 Black Round Bar Stock List: |
| Product form | Diameter |
| Hot finished, ground, annealed | Dia=20mm,Weight=2.9 kg/m |
| Hot finished, ground, annealed | Dia=22mm,Weight=3.3kg/m |
| Cold drawn, stress relieved | Dia=25mm,Weight=4.5 kg/m |
| Hot worked, annealed, peeled | Dia=30mm,Weight=6.4 kg/m |
| Hot worked, annealed, peeled | Dia=31mm,Weight=6.6kg.m |
| Hot worked, annealed, peeled | Dia=45mm,Weight=14.0 kg/m |
About Gnee Steel
in one-stop service
Gnee Steel is a supplier of Monel Alloy 400 Rod. Our product offerings include seamless pipes (sizes from 4 to 219 mm, thicknesses from 0.5 to 20 mm), welded pipes (sizes from 5.0 to 1219.2 mm, thicknesses from 0.5 to 20 mm), plates (thicknesses from 0.1 to 100 mm, widths from 10 to 2500 mm), strip, round bars (diameters from 3 to 800 mm), flat bars (thicknesses from 2 to 100 mm, widths from 10 to 500 mm), hexagonal bars (2 to 100 mm), wire rod, and extruded sections. We partner with steel mills to provide our customers with Alloy 625 that meets or exceeds numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS.
Gnee Steel stocks and sells Monel Alloy 400 Rod, Tube, Pipe, Plate, Strip, Plate, Round Bar, Flat Bar, Forged Billet, Hexagon, Wire and Extruded Shapes. Feel free to contact us for a quote at ss@gneemetal.com






