Inconel 625 Plate Suppliers
124 vetted U.S. suppliers · 25 states
Inconel 625 plate is the corrosion-resistant nickel alloy of choice for marine, chemical-process, and oil-and-gas pressure-vessel work where moderate strength meets aggressive environments. 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. 36 more across 17 additional states — listed below the chart.
Also covered
North Carolina (5) · New Jersey (4) · Michigan (4) · Georgia (3) · Washington (3) · Indiana (3) · Minnesota (2) · Wisconsin (2) · South Carolina (2) · Virginia (1) · Louisiana (1) · Tennessee (1) · Kansas (1) · Missouri (1) · Iowa (1) · Massachusetts (1) · New Hampshire (1)
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What Inconel 625 plate is
Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum-niobium alloy strengthened by solid-solution rather than precipitation — meaning it doesn't require post-fabrication heat treatment to maintain properties. Plate is supplied solution-annealed per ASTM B443 in thicknesses from 0.125" through 4" and beyond. Common downstream: subsea components, flare-stack tip liners, pressure vessels in sour service, and marine heat-exchanger tubesheets. NACE MR0175 / ISO 15156 compliance is standard for oil-and-gas service.
What to look for in a supplier
Confirm the supplier carries ASTM B443 plate (or ASME SB-443 for pressure-vessel work). For oil-and-gas applications, NACE MR0175 compliance is usually required — ask explicitly. Decide on grade: Grade 1 (annealed) for thinner sections and general fab, Grade 2 (solution-annealed at higher temp) for thicker sections and higher-temperature service. Lead times on rare thicknesses can be long since 625 is a mill-order item for many stockists — confirm stock position before quoting.
FAQ
Common questions
What's the difference between Inconel 625 and 718?
625 is solid-solution-strengthened (no heat treatment required, better welding) — used for corrosion resistance in marine and chemical service. 718 is precipitation-hardened (higher strength, but requires post-weld heat treatment) — used for high-temperature mechanical service like turbine disks. They're not interchangeable.
Is Inconel 625 weldable?
Yes, excellently. 625 is one of the most weldable nickel alloys and is commonly used as filler metal for dissimilar-metal welds. Matching filler (ERNiCrMo-3 / 625) is standard. Post-weld heat treatment is generally not required unless the design code calls for it.
What's the difference between Grade 1 and Grade 2 Inconel 625?
Grade 1 is solution-annealed at 1750°F — better strength at lower temperatures, recommended below 1200°F service. Grade 2 is annealed at 2000°F — coarser grain, better creep strength for service above 1200°F. Use Grade 1 unless your design temperature requires Grade 2.
Does Inconel 625 need NACE certification?
Only if the application is sour-service oil-and-gas where hydrogen sulfide exposure can cause stress corrosion cracking. NACE MR0175 / ISO 15156 compliance is documented per heat-lot by qualified mills. Most stocking distributors can supply NACE-certified material on request — confirm before PO.
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