Monel® 400 Alloy Round Bar | Marine-Grade Corrosion Resistance & Durability

✓ Seawater Invincibility: 0.002mm/year corrosion rate in seawater, resisting pitting, crevice corrosion, and biofouling.

✓ Acid Resistance: Withstands 70% H₂SO₄ at 50°C (122°F) and HF vapors – ideal for chemical processing equipment.

✓ Thermal Stability: Maintains structural integrity from **-100°C to 480°C (-148°F to 896°F).

✓ Machinability: Cold-drawn or hot-rolled bars with **±0.5% diameter tolerance** and Ra ≤0.8μm surface finish for precision machining.

Monel® 400 Alloy Round Bar (UNS N04400)

Engineered for marine, chemical, and oil & gas applications, Monel® 400 alloy round bar combines a nickel-copper matrix (Ni-63%, Cu-30%) to deliver unmatched resistance to seawater, sulfuric acid, hydrofluoric acid (HF), and alkaline solutions. Certified to ASTM B164, ASME SB-164, and NACE MR0175, this alloy outperforms stainless steels in chloride-rich environments while offering cost-effective durability for critical infrastructure projects.

Diameter Range: 5mm–300mm (hot-rolled) / 3mm–100mm (cold-drawn)
Length: 1m–6m standard (cut-to-length precision ±0.5mm)
Surface Finishes: Pickled, Polished (Ra ≤0.6μm), Electropolished (Ra ≤0.4μm)
Mechanical Properties: Yield Strength ≥240 MPa | Tensile Strength ≥550 MPa | Elongation ≥35% | Hardness ≤200 HBW

Parameter Category	Value/Description
Material Standard	ASTM B164 (Hot/Cold-Finished Bars), ASME SB164, EN 2.4360
Chemical Composition (%)	Ni 63–70, Cu 28–34, Fe ≤2.5, Mn ≤2.0, C ≤0.3, Si ≤0.5, S ≤0.024, Al ≤0.5, Ti ≤0.5
Tensile Strength (MPa)	≥480 (Annealed)
Yield Strength (MPa)	≥170 (Annealed)
Elongation (%)	≥35 (in 50mm gauge length)
Hardness	Brinell (HBW): ≤150; Rockwell (HRB): ≤80 (Annealed)
Density (g/cm³)	8.80
Melting Range (°C)	1300–1350
Thermal Conductivity (W/m·K)	21.8 (at 20°C)
Thermal Expansion (10⁻⁶/°C)	14.4 (20–100°C)
Electrical Resistivity (Ω·m)	0.51 × 10⁻⁶ (at 20°C)
Elastic Modulus (GPa)	179
Magnetic Permeability	Non-magnetic
Corrosion Resistance	Excellent resistance to seawater, hydrofluoric acid (HF), sulfuric acid (H₂SO₄), alkaline solutions, and chloride-induced stress corrosion cracking (SCC). Avoid oxidizing acids (e.g., HNO₃).
Heat Treatment	Annealing: 870–980°C followed by rapid cooling (water or air).
Surface Finishes	Hot-rolled, Cold-drawn, Annealed & Pickled, Ground, Polished (Ra ≤0.8μm).
Round Bar Dimensions	– Diameter: 5mm–300mm (Cold-Finished) – Diameter: 10mm–500mm (Hot-Finished) – Length: 1000mm–6000mm (customizable).
Key Applications	Marine shafts, valve stems, pump components, fasteners, chemical processing equipment, and heat exchanger parts.

Monel® 400 Alloy Round Bar (UNS N04400) Applications

Industry	Critical Components	Monel® 400 Round Bar Advantage
Marine Engineering	Seawater pump shafts, propeller valves	0.001mm/year corrosion rate in 3.5% NaCl seawater at 30°C.
Chemical Processing	Sulfuric acid storage tanks, HF reactors	Resists 50% H₂SO₄ + 10% HF at 60°C (140°F).
Oil & Gas	Offshore platform fasteners, sour gas piping	Survives H₂S >1,000 ppm + CO₂ at 120°C (248°F).
Power Generation	Heat exchanger tubes, condenser systems	Immune to steam erosion at 400°C (752°F).

Monel® 400 Alloy Round Bar (UNS N04400) Product Packaging

Monel® 400 Alloy Round Bar (UNS N04400) (UNS N04400/N05500, ASTM B164/ASME SB-164 compliant) are engineered for exceptional performance in seawater, sulfuric acid, and high-temperature hydrocarbon environments. To ensure pristine surface quality and dimensional precision during global transit, we implement marine-certified packaging systems and intelligent logistics protocols adhering to NACE MR0175, DNVGL-RP-0419, and IMO MSC.245(83) standards.

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