Nickel Alloy Bar — The Complete Specification Guide
Nickel 200, Monel 400, Inconel 600/625 and Incoloy 825 bar for corrosion-critical and high-temperature service — grades, mechanical envelope, and how to buy.
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Nickel alloy bar is the material of choice wherever chloride corrosion, reducing acids or elevated temperatures would eat carbon steel or stainless within months. From marine heat exchangers to petrochemical reactor internals, nickel alloys deliver decades of service where lesser materials fail in weeks.
This pillar guides you through the five alloys we hold in bar form, the standards they conform to, and the buying checklist that avoids the common substitution mistakes that turn a specification into an expensive incident.
Go to product rangeHow it's made
Vacuum melt & VIM
Alloys are vacuum-induction melted for low residuals; critical service grades are additionally VAR-remelted.
Hot rolling & forging
Ingots are converted to bar by hot rolling or open-die forging with tight thermal control to avoid intergranular carbide precipitation.
Solution annealing
Bars are solution-annealed and water-quenched to lock in optimum corrosion resistance and mechanical properties.
Straightening & finishing
Bars are roller-straightened, centreless-ground where required, and stamped with heat number for full traceability.
Where it's used
- Chemical processing reactor internals
- Offshore oil & gas topsides
- Sour-service (H₂S) valves & fasteners
- Seawater heat exchangers & pumps
- Aerospace exhaust & turbine hardware
- Power generation superheater tubing
- Pharmaceutical & food-grade equipment
- Nuclear reactor & waste handling
Why buyers specify it
Chloride pitting resistance
Monel and Inconel grades resist pitting and crevice corrosion in seawater and chloride-bearing process streams.
Elevated-temperature strength
Inconel 625 retains yield strength above 800 °C — well beyond stainless steel's practical limit.
Wide chemical compatibility
One material family covers hydrofluoric acid, caustic soda, sour gas and reducing acids that attack other metals.
Full traceability
PMI, chemistry, mechanical and hardness reports on every bar — with heat-number stamping straight from the mill.
Codes we build to
- ASTM B160 — Nickel 200/201 bar
- ASTM B164 — Monel 400/K-500 bar
- ASTM B166 — Inconel 600/601 bar
- ASTM B446 — Inconel 625 bar
- ASTM B425 — Incoloy 825 bar
- NACE MR0175 / ISO 15156 for sour service
Technical envelope
Diameter | 6 mm – 250 mm round; hex and square on request |
|---|---|
Length | 3,000–6,000 mm standard; cut-to-length on request |
Alloys | Nickel 200/201, Monel 400/K-500, Inconel 600/601/625, Incoloy 800/825 |
Condition | Solution annealed + water quenched; cold-drawn on request |
Finish | Peeled, centreless-ground or turned & polished |
Certification | EN 10204 3.1/3.2, PMI report, NACE MR0175 compliance |
Specify with confidence
Identify the service
Chloride pitting → Monel 400 or Inconel 625. Reducing acid → Nickel 200. High-temperature strength → Inconel 625. Sour gas → Inconel 825 or 625 to NACE MR0175.
Pick the condition
Solution-annealed for maximum corrosion resistance; cold-drawn when strength beats corrosion.
Specify certification
3.1 covers most process piping; add 3.2 (third-party witnessed) for pressure-vessel and nuclear service.
Confirm PMI on receipt
Nickel alloys look almost identical — always PMI at goods-in to catch substitution errors.
Common questions
The questions our sales engineers hear most often about this product family.
Datasheets & guides
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