Monel 400 is a nickel-copper alloy renowned for its excellent corrosion resistance, high strength, and durability in marine and chemical environments. Monel 400 round bars are widely used in manufacturing pumps, valves, shafts, heat exchangers, and other components exposed to aggressive conditions. Understanding its factory specifications, mechanical properties, and production capabilities is essential for industrial procurement.
Introduction to Monel 400
Monel 400 combines approximately 63% nickel and 28–34% copper with small amounts of iron, manganese, carbon, and silicon. This composition ensures superior corrosion resistance while maintaining good mechanical properties.
Monel 400 Round Bar Overview
Monel 400 round bars are produced in various diameters and lengths. They are available in hot-rolled, cold-drawn, and precision machined forms depending on customer requirements. The bars can be used directly or machined into parts for marine, chemical, and industrial applications.
Chemical Composition
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 63 min |
| Copper (Cu) | 28–34 |
| Iron (Fe) | ≤ 2 |
| Manganese (Mn) | ≤ 2 |
| Carbon (C) | ≤ 0.3 |
| Silicon (Si) | ≤ 0.5 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 550–690 MPa |
| Yield Strength | 240 MPa min |
| Elongation | 30–45 % |
| Hardness | ≤ 95 HRB |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.8 g/cm³ |
| Melting Range | 1300–1350 °C |
| Thermal Conductivity | 21.4 W/m·K |
| Electrical Resistivity | 49.0 μΩ·cm |
Corrosion Resistance
Monel 400 round bars are highly resistant to:
- Seawater and marine atmospheres
- Alkaline solutions and salts
- Acetic and formic acids
- Hydrochloric acid (dilute)
High-Temperature Performance
Monel 400 maintains good strength and oxidation resistance up to 540°C. It is suitable for heat exchangers and other moderately high-temperature applications.
Heat Treatment
Monel 400 is generally supplied in the as-cast, annealed, or hot-rolled condition. Heat treatment primarily involves annealing to relieve stresses and improve ductility:
- Annealing: 900–1000°C, followed by water quenching
Machining and Welding
Monel 400 can be machined with standard cutting tools, though tool wear is higher than steel. It can be welded using TIG, MIG, or resistance welding. Preheating is usually not required, but post-weld stress relief is recommended for thick sections.
Typical Specifications and Tolerances
| Diameter / Size | Tolerance |
|---|---|
| 10–300 mm | ±0.2–0.5 mm |
| Plate / Sheet | ±0.3–1 mm |
Surface Finish
Monel 400 round bars are available in:
- Black mill finish (hot-rolled)
- Turned bright finish
- Polished or ground surface
Standards and Grade References
Common standards and designations include:
| Standard | Designation |
|---|---|
| ASTM B127 | Monel 400 Plate & Sheet |
| ASTM B164 | Monel 400 Rod / Bar |
| UNS | N04400 |
Factory Production and Supply
Modern factories can supply Monel 400 round bars in large quantities with certifications including ASTM, AMS, and ISO. Production capacity allows for custom sizes, machining, and surface finishes according to customer requirements.
Applications
- Chemical processing equipment
- Marine engineering components, such as shafts and fasteners
- Heat exchangers
- Valve and pump components
- Offshore oil and gas infrastructure
Frequently Asked Questions (FAQ)
What is the UNS number for Monel 400?
The UNS designation for Monel 400 is N04400.
What are the main corrosion environments for Monel 400?
Monel 400 is highly resistant to seawater, marine atmospheres, and dilute acids like acetic acid and hydrochloric acid.
What sizes are available for Monel 400 round bars?
Common diameters range from 10 mm to 300 mm, with tolerances depending on the manufacturing process and customer requirements.
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