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Monel 400 Round Bars – ASTM B164 UNS N04400 Supplier in India
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier and stockist in Mumbai, India. We supply Alloy 400 bar stock manufactured according to the ASTM B164 / ASME SB164 standard.
Monel 400 round bar is a solid-section nickel-copper alloy (67% Ni, 31% Cu) in bar stock form. This single-phase FCC solid-solution alloy (UNS N04400, Werkstoff Nr. 2.4360) resists hydrofluoric acid at all concentrations up to boiling, is highly immune to chloride stress-corrosion cracking, and retains ductility down to cryogenic temperatures with no brittle transition. Monel 400 bar is strengthened by cold work only; it is not heat-treatable. Each of our Monel 400 round bars are supplied with EN 10204 3.1 mill test certificates and PMI reports. Annealed bars reach 517 MPa (75 ksi) tensile strength and 35% elongation. Cold-drawn bars push yield to 379 MPa (55 ksi) for high-load shaft and fastener applications. Service temperature spans cryogenic (–196°C) to 538°C (1000°F). Monel 400 exhibits slight ferromagnetism below its Curie temperature range of approximately 21–49°C, depending on composition and cold work. Monel 400 is NACE MR-01-75 listed for sour gas service and ASME BPVC approved (Sections III and VIII). It has a density of 8.80 g/cm³.
Diameters span 3 mm to 500 mm in lengths of 1000–6000 mm. Forms include round bar, hex bar, flat bar, square bar, forged bar, bright bar, black bar, hollow bar, and rod in hot-rolled, cold-drawn, centreless-ground, and forged finishes. ASTM B164 also covers UNS N04405, a free-machining variant with controlled sulphur for automatic screw machine work. Key industries served include marine & offshore, oil & gas processing, chemical processing, power generation, pulp & paper, and aerospace & defence.
Monel 400 Round Bar & Rod Specifications
Monel 400 bar specifications like standards, diameters, conditions, finishes, tolerances, and forms are covered in detail in the table below:
| Standards | ASTM B164 / ASME SB164 |
|---|---|
| AMS / Federal | AMS 4675 / QQ-N-281 |
| Round Bar Dia. | 3 mm – 500 mm |
| Hex Bar | 6 mm – 75 mm A/F |
| Length | 1000 – 6000 mm, cut-to-size |
| Condition | Annealed (A), Hot Finished (H), Cold Drawn (T), Stress Relieved (S) |
| Finish | Bright Ground, Black, Peeled, Polished, Rough Turned |
| Tolerance | h8, h9, h10, h11 per ISO 286-2 |
| Forms | Round, Hex, Flat, Square, Forged, Bright, Black, Hollow |
Monel 400 Bar vs Monel K500 Bar – Selection Guide
Key comparison for bar stock selection covers parameters like strength, machinability, magnetic properties and common applications.
| Parameter | Monel 400 | Monel K500 |
|---|---|---|
| Strengthening | Solid solution | Precipitation hardened |
| Tensile (min) | 517 MPa | 965 MPa (aged) |
| Yield (min) | 207 MPa | 690 MPa (aged) |
| Hardness | 110–185 HB | 250–350 HB (aged) |
| Machinability | Good | Moderate (harder) |
| Magnetic at RT | Slightly | Non-magnetic |
| Typical Use | Shafts, stems, fasteners | Pump shafts, drill collars |
Specify Monel 400 when corrosion resistance is primary and moderate strength is sufficient. Choose Monel K500 round bar when high strength is needed for pump shafts, drill collars, and springs.
Chemical Composition of Monel 400 Bar & Rod
Monel 400 chemical composition of round bar and rod as per ASTM B164, UNS N04400 is mentioned in the table given below:
| Nickel (Ni) + Cobalt (Co) | Copper (Cu) | Iron (Fe) | Manganese (Mn) | Carbon (C) | Silicon (Si) | Sulphur (S) |
|---|---|---|---|---|---|---|
| 63.0 min | 28.0 – 34.0 | 2.5 max | 2.0 max | 0.3 max | 0.5 max | 0.024 max |
UNS N04405 (free-machining variant) has controlled sulphur at 0.025–0.060% for improved chip breaking in automatic screw machine operations. All other elements remain identical to N04400.
Mechanical Properties of ASTM B164 Monel 400 Round Bar
Monel 400 mechanical properties as per ASTM B164, including tensile and yield strength, elongation, and hardness in the annealed and cold-drawn conditions is covered below:
| Property | Tensile (min) | Yield 0.2% (min) | Elongation (min) | Hardness |
|---|---|---|---|---|
| Annealed (A) | 517 MPa (75 ksi) | 207 MPa (30 ksi) | 35% | 110–185 HB |
| Cold Drawn (T) | 586 MPa (85 ksi)* | 379 MPa (55 ksi)* | 15%* | – |
*Cold-drawn values for diameter ≤12.7 mm. Larger bars: 552 MPa tensile, 345 MPa yield, 20% elongation. Cold drawing increases yield from 207 to 379 MPa for high-load shaft applications.
Physical Properties of Monel 400
Physical properties, including Monel 400 density, melting range, Curie temperature, thermal conductivity and expansion and modulus of elasticity arementioned below:
| Density | Melting Range | Curie Temperature | Thermal Conductivity (25°C) | Elastic Modulus | Thermal Expansion (25–100°C) | Electrical Resistivity (25°C) |
|---|---|---|---|---|---|---|
| 8.80 g/cm³ | 1300–1350 °C | 21–49 °C | 21.8 W/m·°C | 179 GPa | 13.9 × 10⁻⁶ /°C | 0.547 µΩ·m |
Monel 400 Bar Equivalent Grades
The standard equivalent designation for Alloy 400 round bar is UNS N04400, sometimes also covering UNS N04405. Some other equivalent designations are covered in the table below:
| UNS | Werkstoff Nr. | JIS | GOST |
|---|---|---|---|
| N04400 / N04405 | 2.4360 / 2.4361 | NW 4400 | МНЖМц 28-2,5-1,5 |
Get Monel 400 Round Bars at Competitive Prices
Available Forms of Monel 400 Bar & Rod
Monel 400 bar stock forms for machining, fabrication, and structural use:
Monel 400 Round Bar
Monel 400 Hex Bar
Monel 400 Flat & Square Bar
Monel 400 Forged Bar
Monel 400 Bright Bar
Monel 400 Black Bar
Monel 400 Hollow Bar
Monel 400 Rod
Machinability & Fabrication of Monel 400 Bar
Monel 400 machinability is possible with carbide tooling at 18–30 m/min cutting speed for turning in the annealed condition. The work-hardening rate is between mild steel and SS 304. Use fresh carbide tools with positive rake angles and heavy, steady feeds to avoid rubbing. UNS N04405 (free-machining) is preferred for high-volume screw machine work.
Hot forging the round bar at 649–1177°C is recommended. Avoid working below 649°C. Weld by GTAW, GMAW, or SMAW using ERNiCu-7 filler. No PWHT is required. Stress-relieve cold-drawn bars at 538°C to stabilise dimensions without losing strength.
Industries Using Monel 400 Round Bar & Rod
Monel 400 bars and rods are specified across industries where solid-section corrosion-resistant material is needed for shafts, fasteners, valve components, and machined parts. These bars are used in the following 6 key applications:
-
Propeller shafts, pump shafts, mooring hardware, and CNC-machined valve stems for seawater platforms.
-
Choke valve components and flow control trim for HF alkylation (NACE MR-01-75).
-
Agitator shafts, impeller blanks, and hex-bar fasteners for acid-resistant joints.
-
Feedwater heater support bars and deaerator valve components.
-
Fuel system fittings and hydraulic actuator rods (AMS 4675).
-
Doctor blade holders and bleach plant shafts.
How to Order Alloy 59 Round Bars
- Product Form: Round Bar, Hex Bar, Flat Bar, Square Bar, Forged Bar, Hollow Bar, Threaded Rod
- Grade: UNS N04400 or UNS N04405 (free-machining)
- Diameter / Size: specify mm or inches; A/F for hex
- Length: standard or custom cut-to-length
- Quantity: in kg, MT, pieces, or running metres
- Condition: Annealed, Cold Drawn, Hot Finished, Stress Relieved
- Surface Finish: Bright Ground, Black, Peeled, Polished, Rough Turned
- Tolerance: h8, h9, h10, h11 per ISO 286-2
- Applicable Standard: ASTM B164 / ASME SB164 / AMS 4675 / QQ-N-281
- Additional Testing: PMI, UT, MPI, NACE, Third-Party Inspection
- Certification: EN 10204 3.1 / 3.2, NACE MR-01-75
- Packaging & Delivery: domestic / export-grade wooden case
Frequently Asked Questions
What ASTM Standard Covers Monel 400 Round Bar?
ASTM B164 / ASME SB164 covers UNS N04400 and N04405 rod, bar, and wire. AMS 4675 for aerospace.
What is the Difference Between UNS N04400 and UNS N04405 Bar?
Both are nickel-copper alloys under ASTM B164. N04405 has controlled sulphur (0.025–0.060%) for better chip breaking in screw machine work. All other elements match N04400. Choose N04405 for high-volume CNC turning.
What Diameters are Available for Monel 400 Round Bar?
Nicorex Alloys stocks Monel 400 round bar in diameters from 3 mm to 500 mm. Standard mill lengths are 1000 mm to 6000 mm. Custom diameters, cut lengths, and centreless-ground bars with tight tolerance (h8, h9) are available on request.
Is Monel 400 Round Bar Magnetic?
Monel 400 round bar is slightly ferromagnetic at room temperature (Curie temp 21–49°C). For non-magnetic needs, Monel K500 age-hardened bar offers near-zero permeability.
What is the Maximum Service Temperature for Monel 400 Bar?
The maximum service temperature for Monel 400 bar is 538°C (1000°F) for continuous service. For intermittent or short-term exposure, temperatures up to 600°C may be tolerated. The alloy stays ductile to –196°C with no brittle transition.
What is the Price of Monel 400 Round Bar per kg in India?
The price of Monel 400 round bar in India is Rs 2000-3000 per kg. It depends on diameter, length, quantity, condition (annealed or cold drawn), and prevailing nickel-copper market rates. Contact Nicorex Alloys with your specific requirements for a same-day quotation. Pricing is provided per kg or per piece, depending on order volume.