Monel 405 bar is a free-machining nickel-copper alloy widely used in industries that demand both corrosion resistance and high production efficiency. As a modified version of Monel 400, Monel 405 contains increased sulfur content, which significantly improves machinability without compromising its core resistance to seawater, acids, and alkaline environments. For engineers, procurement managers, and industrial buyers, understanding available sizes, specifications, and pricing trends is essential when sourcing Monel 405 bars from reliable suppliers.
Monel 405 bar is a solid round or hexagonal product form of the Monel 405 alloy, specifically designed for machining applications. It maintains the excellent corrosion resistance and stable density of Monel 400, while offering improved cutting performance. This makes it particularly suitable for high-volume manufacturing using automatic lathes and CNC machines.
| Element | Composition (%) |
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 28.0 – 34.0 |
| Iron (Fe) | 2.5 max |
| Manganese (Mn) | 2.0 max |
| Carbon (C) | 0.3 max |
| Silicon (Si) | 0.5 max |
| Sulfur (S) | 0.025 – 0.060 |
The elevated sulfur content is the defining feature that enhances machinability, making Monel 405 bars ideal for precision components.
| Property | Value |
| Density | 8.80 g/cm³ |
| Melting Range | 1300 – 1350°C |
| Thermal Conductivity | 21.8 W/m·K |
| Thermal Expansion | 13.9 µm/m·°C |
| Electrical Resistivity | 0.50 µΩ·m |
The stable density and thermal properties ensure reliable performance in applications involving heat transfer and temperature fluctuations.
| Property | Typical Value |
| Tensile Strength | 480 – 620 MPa |
| Yield Strength | 170 – 310 MPa |
| Elongation | 25 – 30% |
| Hardness | 100 – 140 HB |
| Modulus of Elasticity | 179 GPa |
While slightly lower than Monel 400 in strength, these mechanical properties are sufficient for most machined parts and industrial fittings.
| Bar Type | Diameter Range | Length |
| Round Bar | 6 mm – 300 mm | 1000 – 6000 mm |
| Hex Bar | 8 mm – 100 mm | 1000 – 6000 mm |
| Square Bar | 10 mm – 100 mm | 1000 – 6000 mm |
| Custom Sizes | Available | Cut-to-length |
Suppliers typically offer both standard and custom dimensions to meet specific engineering requirements. Tight tolerances are available for precision machining applications.
| Standard | Details |
| UNS Number | N04405 |
| ASTM | B164 |
| ASME | SB164 |
| AMS | AMS 4674 |
| Form | Bar, Rod |
These specifications ensure consistency in chemical composition, mechanical properties, and quality across different suppliers.
| Property | Monel 405 Bar | Monel 400 Bar |
| Machinability | Excellent | Moderate |
| Density | 8.80 g/cm³ | 8.80 g/cm³ |
| Tensile Strength | 480 – 620 MPa | 550 – 750 MPa |
| Applications | Machined parts | Structural components |
| Cost Efficiency | High in production | Higher machining cost |
This comparison highlights that Monel 405 bar is preferred for machining-intensive applications, while Monel 400 bar is better suited for high-strength structural use.
– Automatic screw machine components
– Valve stems and fittings
– Pump shafts and bushings
– Fasteners and connectors
– Electrical and marine hardware
These applications benefit from both corrosion resistance and improved machinability, especially in marine and chemical processing environments.
| Diameter | Form | Reference Price (USD/kg) |
| 10 – 50 mm | Round Bar | 32 – 42 |
| 50 – 150 mm | Round Bar | 34 – 45 |
| Hex/Square | Bar | 35 – 46 |
| Custom Sizes | Bar | Quote-based |
Prices vary depending on raw material costs, order quantity, and processing requirements. Machining advantages often offset the slightly higher price of Monel 405.
When sourcing Monel 405 bars, selecting the right supplier is critical to ensure quality and reliability. Consider the following factors:
Material Certification
Ensure compliance with ASTM and ASME standards, along with mill test certificates (MTC).
Inventory and Lead Time
Suppliers with large inventory can offer faster delivery, which is essential for urgent projects.
Processing Capabilities
Look for suppliers that offer cutting, machining, and custom sizing services.
Quality Control
Reliable suppliers maintain strict quality inspection processes to guarantee consistent mechanical properties and chemical composition.
Shanghai NC Metal Materials Co., Ltd. is one of the recognized suppliers providing Monel 405 bars in various sizes and specifications for industrial applications.
Choosing Monel 405 bar depends on balancing mechanical properties, machinability, and cost:
Choose Monel 405 Bar when:
– High-speed machining is required
– Complex or precision parts are needed
– Production efficiency is a priority
Consider alternatives when:
– Higher mechanical strength is required (Monel 400)
– Low thermal expansion is critical (e.g., Invar alloys)
Understanding the application requirements ensures optimal performance and cost-effectiveness.
What sizes are available for Monel 405 bars?
Monel 405 bars are available in round, hex, and square forms, typically ranging from 6 mm to 300 mm in diameter, with custom sizes available upon request.
Is Monel 405 suitable for marine applications?
Yes, Monel 405 offers excellent corrosion resistance in seawater environments, making it suitable for marine components such as shafts and fittings.
Why is Monel 405 preferred for machining?
Monel 405 contains higher sulfur content, which improves chip formation and reduces tool wear, making it ideal for high-speed and high-volume machining operations.
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