Incoloy 825 Round Bars

Product Description

Material Summary

Incoloy 825 (UNS N08825 / W.Nr. 2.4858) is a highly versatile nickel-iron-chromium superalloy optimized for performance in aggressively corrosive, chemical, and aqueous environments. While frequently marketed under the "Inconel" moniker by commercial distributors, it belongs technically to the Incoloy family due to its substantial iron content ($>22.0\%$).

Unlike the Alloy 800 series which prioritizes high-temperature creep strength, Alloy 825 introduces key additions of molybdenum, copper, and titanium to provide specialized resistance to severe chemical reduction, pitting, and intergranular attacks.

Chemical Matrix & Metallurgical Stabilization

The deliberate balancing of elements gives UNS N08825 round bars unique corrosion-resistant dynamics:

• Nickel (38.0% – 46.0%): Provides a resilient baseline that protects components against chloride-ion stress corrosion cracking (SCC) and ensures an exceptionally stable austenitic microstructure.

• Molybdenum (2.5% – 3.5%) & Copper (1.5% – 3.0%): Work in combination with nickel to resist aggressive reducing acids, specifically delivering top-tier resilience when exposed to sulfuric, phosphoric, and organic processing acids.

• Chromium (19.5% – 23.5%): Shields the material from oxidizing conditions, nitrates, and highly corrosive organic salts.

• Titanium (0.6% – 1.2%): Acts as a stabilizing agent during high-temperature thermal exposure or welding. Titanium binds with carbon to form titanium carbides, preventing chromium carbide precipitation at the grain boundaries, which fully eliminates the risk of intergranular corrosion (sensitization).

Key Mechanical & Technical Properties

• Tensile Strength: $\ge 550 \text{ MPa}$ ($80 \text{ ksi}$)

• Yield Strength (0.2% Offset): $\ge 220 \text{ MPa}$ ($32 \text{ ksi}$)

• Elongation at Break: $\ge 30\%$

• Density: $8.14 \text{ g/cm}^3$

• Melting Range: $1370^\circ\text{C} - 1400^\circ\text{C}$ ($2500^\circ\text{F} - 2550^\circ\text{F}$)

• Compliance Standards: Extensively sourced to meet strict NACE MR0175 / ISO 15156 compliance criteria for critical downhole and sour gas configurations.

Sourcing Forms & Industry Variations

Industrial stockists supply these round bars across an array of manufacturing dimensional ranges (typically from 3mm up to 500mm diameters) and finishes:

• For harsh processing conditions demanding deep certification, hot-forged and precision-machined bars like the Inconel 825 Round Bar feature polished surfaces, compliance with ASTM B425 / ASME SB425, and strict NACE MR 0175 certification for nuclear and oil & gas setups.

• • For precision components, machining steps, or specialized hardware parts, smaller pre-cut or smooth-turned profiles like the Incoloy 825 Round Bars - Diameter: 20 Millimeter (Mm) or the INCONEL 825 ROUNDBAR deliver high geometric stability for industrial tooling.

  Primary Applications

  • Oil & Gas Industry: Downhole equipment components, sour gas processing wellheads, valve internals, and high-strength fasteners.

  • Chemical Processing: Agitator shafts, heat exchanger tubes, and processing systems utilizing sulfuric, nitric, or phosphoric acids.

  • Marine Engineering: Propeller shafts, marine hardware, and exhaust systems subject to high-salinity seawater exposure.

  • Nuclear Processing: Fuel element dissolving systems and highly monitored radioactive waste handling hardware.