Monel 400 Round Bar Suppliers
97 vetted U.S. suppliers · 25 states
Monel 400 round bar is the nickel-copper alloy of choice for marine hardware, valve trim, chemical fittings, and any application combining seawater resistance with mechanical strength. Below is our live count of vetted U.S. suppliers with state distribution and a one-click RFQ flow.
Geographic distribution
Where these suppliers are
Top 8 states by vetted-supplier density. 28 more across 17 additional states — listed below the chart.
Also covered
New Jersey (3) · Georgia (3) · Michigan (3) · Indiana (3) · Minnesota (2) · Wisconsin (2) · North Carolina (2) · Louisiana (1) · Tennessee (1) · Kansas (1) · Missouri (1) · Rhode Island (1) · South Carolina (1) · Iowa (1) · Massachusetts (1) · New Hampshire (1) · Washington (1)
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What Monel 400 round bar is
Monel 400 (UNS N04400) is a nickel-copper alloy — about 67% Ni, 30% Cu — with excellent corrosion resistance in seawater, hydrofluoric acid, alkaline solutions, and reducing environments. Bar is supplied per ASTM B164 in annealed (lower strength, easier machining) or cold-drawn (higher strength) condition. Common downstream: marine pump shafts, valve stems, propeller shafts, chemical fasteners, and HF acid service.
What to look for in a supplier
Confirm the supplier carries ASTM B164 with full mill certs — Monel is expensive enough that traceability isn't optional. Decide on temper: annealed (Class A) for ductility-critical work or where post-machining welding is required, cold-drawn (Class B) for higher tensile strength. Diameter range is typically 0.25" through 8" from stocking distributors. Ask about cut tolerance and length — most suppliers stock 12-ft lengths and cut-to-length on demand. For high-purity applications, ask about smelter source and impurity certifications (sulfur, phosphorus, lead all matter in some applications).
FAQ
Common questions
What's the difference between Monel 400 and Monel K-500?
K-500 is a precipitation-hardenable variant with small additions of aluminum and titanium — significantly stronger after age-hardening (~100 ksi yield vs. 400's ~50 ksi). Use K-500 for high-strength marine fasteners and shafting; use 400 for general corrosion service where strength isn't the driver.
Why use Monel 400 instead of stainless steel?
Monel handles environments that destroy stainless — particularly hydrofluoric acid (Monel is one of the only commercial alloys that survives it), reducing chemical environments, and high-velocity seawater. Monel also resists chloride stress-corrosion cracking, which affects 300-series stainless under load in marine service.
What sizes does Monel 400 round bar come in?
Stocking distributors typically carry 0.25" through 8" diameter in standard increments. Larger diameters (10", 12") and unusual sizes (3/8", 5/8", 7/8") often run special order with 4-8 week lead times.
Is Monel 400 weldable?
Yes — Monel 400 is very weldable using matching filler (ERNiCu-7). Pre-heat is generally not required. Post-weld heat treatment is not required for corrosion service. Annealing after heavy cold work may be needed to restore ductility.
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