Monel 400 Square Rods
Monel 400 Square Rods, made from the high-performance nickel-copper alloy UNS N04400, are widely recognized for their exceptional resistance to seawater, corrosive chemicals, alkalis, and reducing environments. These rods offer a unique combination of durability, strength, and toughness, making them suitable for demanding industrial applications. Their square profile provides superior load-bearing capacity, uniform strength distribution, and ease of fabrication for structural, engineering, and heavy-duty components compared to round or flat profiles..
The alloy composition of Monel 400 — primarily nickel and copper — provides excellent resistance to stress-corrosion cracking, pitting, and general corrosion in brine, marine environments, and acidic media such as hydrofluoric and sulfuric acids. This makes Monel 400 Square Rods ideal for offshore engineering, shipbuilding, desalination plants, heat exchangers, and high-temperature chemical processing systems. Additionally, the material performs reliably across a broad temperature range, from cryogenic conditions to elevated service temperatures, retaining mechanical strength and impact resistance..
Monel 400 Square Rods are also appreciated for their outstanding mechanical properties, including high tensile strength, excellent ductility, and good hardness in both annealed and cold-worked conditions. The alloy is easily fabricated by machining, forming, forging, and welding, providing versatility for manufacturing custom-engineered parts such as pump shafts, valve components, brackets, marine fasteners, and precision structural assemblies. Cold working significantly increases strength where high mechanical loading is expected..
Industries prefer Monel 400 Square Rods for applications where reliability and corrosion resistance are essential for long service life. In oil and gas operations, they are used in process piping systems, instrumentation, and downhole tools due to their resistance to sour gas and saline media. Shipyards and marine engineering companies use them for structural components, propeller shaft supports, heat exchanger parts, and underwater fittings. Chemical plants utilize these rods in acidic and caustic handling equipment thanks to their stable metallurgical behavior in harsh chemical exposure.
Specifications & Standards
| Property | Standard |
|---|---|
| Grades | SS 304 / SS 304L |
| Standards | ASTM A276, ASTM A479, EN 10088, ASME SA276 |
| Forms | Hot Rolled Bar, Cold Drawn Bar, Bright Bar, Polished Bar |
| Finishes | Black, Bright, Peeled, Polished |
| Testing | MTC EN 10204 3.1, PMI, Hardness, Tensile, Dimensional |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) |
|---|---|---|
| C | ≤0.08 | ≤0.03 |
| Mn | ≤2.00 | ≤2.00 |
| Si | ≤1.00 | ≤1.00 |
| P | ≤0.045 | ≤0.045 |
| S | ≤0.03 | ≤0.03 |
| Cr | 18–20 | 18–20 |
| Ni | 8–10.5 | 8–12 |
| N | ≤0.10 | ≤0.11 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 515 – 620 MPa |
| Yield Strength | 205 – 310 MPa |
| Elongation | 40% (min) |
| Hardness | HRB 80–95 |
Equivalent Grades
| Standard | SS 304 | SS 304L |
|---|---|---|
| UNS | S30400 | S30403 |
| EN | 1.4301 | 1.4307 |
| AISI | 304 | 304L |
Dimension Chart – SS 304/304L Round Bar
| Diameter (mm) | Diameter (inch) | Length (mm) | Tolerance |
|---|---|---|---|
| 6–20 | 1/4"–3/4" | 1000–6000 | ±0.1 – 0.5 mm |
| 22–50 | 1"–2" | 1000–6000 | ±0.25 – 0.75 mm |
| 55–100 | 2.25"–4" | 1000–6000 | Custom |
| 110–200 | 4.5"–8" | Custom | Custom |
Applications of SS 304 / 304L Round Bars
- Food processing & dairy equipment
- Heat exchangers and pressure vessels
- Marine components & offshore structures
- Shafts, fasteners, valves & pump parts
- Architectural structures and railings
- Automobile & fabrication industries
Because square rods provide flat surfaces, they are ideal for fabrication of support frames, structural braces, and machined blocks requiring tight tolerances and dimensional stability. Their uniform geometry ensures ease of assembly, welding, and alignment, especially in precision equipment and pump/valve mounting structures. Monel 400’s non-magnetic behavior in annealed condition also makes these rods suitable for sensitive instrumentation applications where magnetic interference must be minimized..
Overall, Monel 400 Square Rods are a premium choice for industries seeking exceptional resistance to corrosion, high strength, and dependable performance in aggressive service conditions. Their combination of alloy chemistry, mechanical robustness, and geometric advantages makes them indispensable across offshore, marine, petrochemical, defense, and power generation sectors.
Frequently Asked Questions (FAQ)
Q1: What is the difference between SS 304 and SS 304L?
A: SS 304L has lower carbon content (≤0.03%) which improves weldability and prevents carbide precipitation. Both have similar corrosion resistance and strength.
Q2: Do you provide test certificates?
A: Yes, Rose Metal Industries provides MTC 3.1, PMI test reports, hardness test, and third-party inspection reports.
Q3: What standards do your SS 304/304L Round Bars follow?
A: ASTM A276, A479, EN 10088, ASME standards.
Q4: Do you supply custom lengths and finishes?
A: Yes, we offer cut-to-size lengths, bright bars, polished bars, and custom tolerances.
Q5: Where do you supply in India?
A: We supply to Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry & Andaman and Nicobar Islands.