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Incoloy 825 Round Bars & Rods - ASTM B425 UNS N08825 | Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier of Incoloy 825 round bars and rods based in Mumbai, India. We provide these round bars according to the ASTM B425 / ASME SB425 standards.
UNS N08825 (Werkstoff 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The nominal balance of Ni 38-46%, Cr 19.5-23.5%, Mo 2.5-3.5%, Cu 1.5-3.0%, and Ti 0.6-1.2% gives Alloy 825 bar broad-spectrum aqueous corrosion resistance across both reducing and oxidising acid environments. The molybdenum and copper combination resists sulfuric acid and phosphoric acid. The high nickel content provides excellent stress corrosion cracking resistance. Titanium stabilises against intergranular corrosion (IGC) during welding or prolonged exposure at 540-760°C.
Bar diameters range from 3 to 500 mm with lengths from 1 to 6 m. Available forms include round, hex, flat, square, forged (ASTM B564), hollow, and threaded bars. We provide conditions like hot finished, cold drawn, or annealed (955°C / 1750°F). Surface finishes offered are black, bright, peeled, rough turned, and polished. Recommended service temperature is up to 540°C (1000°F). The alloy has a melting range of 1370-1400°C and is non-magnetic. It is approved to NACE MR0175 / ISO 15156 and API 6CRA 825, and is supplied with EN 10204 3.1 MTC, PMI reports, and full traceability. Key industries that use Alloy 825 round bars and rods include chemical processing, oil & gas, pollution control, nuclear fuel processing, marine & offshore, and pickling & acid pollution
Incoloy 825 Round Bar Specifications
Key product specifications for Alloy 825 bar, covering dimensions, conditions, surfaces, tolerances, and quality requirements for industrial engineering applications, are covered in the table below:
| Standard | ASTM B425 / ASME SB425 |
|---|---|
| Forgings | ASTM B564 / ASME SB564 |
| Diameter | 3 – 500 mm |
| Length | 1 – 6 m |
| Condition | Hot Finished, Cold Drawn, Annealed (955°C) |
| Surface | Black, Bright, Peeled, Rough Turned, Polished |
| Tolerance | h7, h9, h10, h11 |
Chemical Composition of Incoloy 825 Round Bar
Chemical composition of Incoloy 825 (UNS N08825) as specified by ASTM B425, detailing alloying elements and their composition limits are as follows:
| Element | Nickel (Ni) | Chromium (Cr) | Iron (Fe) | Molybdenum (Mo) | Copper (Cu) | Titanium (Ti) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Aluminium (Al) |
|---|---|---|---|---|---|---|---|---|---|---|
| Composition | 38.0 – 46.0 | 19.5 – 23.5 | 22.0 min (Balance) | 2.5 – 3.5 | 1.5 – 3.0 | 0.6 – 1.2 | 0.05 max | 1.0 max | 0.5 max | 0.2 max |
Mo + Cu provides dual acid resistance in reducing media (H₂SO₄, H₃PO₄). Ti stabilises the matrix against sensitisation, keeping weld HAZ free of IGC susceptibility.
Mechanical Properties of ASTM B425 Incoloy 825 Round Bar
Mechanical performance in the annealed state, detailing strength, ductility, and hardness benchmarks for Alloy 825 are listed in the table below:
| Property | Tensile Strength | Yield 0.2% Offset | Elongation | Hardness |
|---|---|---|---|---|
| ASTM B425 Min | 586 MPa (85 ksi) | 241 MPa (35 ksi) | 30% | – |
| Typical | 690 MPa (100 ksi) | 324 MPa (47 ksi) | 45% | ~75 HRB |
Alloy 825 is NOT age-hardenable. Strengthening is by cold work only. For applications needing higher strength with similar corrosion resistance, consider Incoloy 925 (UNS N09925).
Physical Properties of Incoloy 825 Bar & Rod
Key physical characteristics of Nickel Alloy 825, including its density, thermal behaviour, mechanical stiffness, and magnetic response across service conditions are provided below:
| Property | Density | Melting Range | Elastic Modulus | Thermal Conductivity (25°C) | Thermal Expansion (20-100°C) | Magnetic |
|---|---|---|---|---|---|---|
| Value | 8.14 g/cm³ (0.294 lb/in³) | 1370-1400°C (2500-2550°F) | 196 GPa (28.3 × 10⁶ psi) | 11.1 W/m·°C | 14.1 µm/m/°C | Non-magnetic in the annealed condition (Curie temp <-196°C) |
Incoloy 825 Round Bar Equivalent Grades
Below are the equivalent designations for Incoloy 825 round bar, including UNS and Werkstoff Nr., DIN, and other equivalent designations:
| Standard | UNS | DIN | Werkstoff | JIS | GOST |
|---|---|---|---|---|---|
| Designation | N08825 | 17752, 17753, 17754 | 2.4858 | NCF 825 | ЭП703 |
Get Incoloy 825 Round Bars at Competitive Prices
Available Forms of Incoloy 825 Bar Stock
Nicorex Alloys stocks Alloy 825 bar in the following 7 forms:
Incoloy 825 Round Bar & Rod
Alloy 825 Hex Bar
Nickel Alloy 825 Flat Bar
Incoloy 825 Forged Bar
Alloy 825 Hollow Bar
Incoloy 825 Threaded Bar
UNS N08825 Square Bar
Acid Resistance & Aqueous Corrosion Performance of Incoloy 825 Bar
The primary advantage of Incoloy 825 round bar is broad-spectrum aqueous corrosion resistance in both reducing and oxidising acids. Molybdenum and copper resists sulfuric acid (H₂SO₄) across a wide concentration range; corrosion rate stays below 0.5 mm/yr in 20% H₂SO₄ at 79°C. In wet-process phosphoric acid (H₃PO₄) with fluorides and chlorides, Alloy 825 outperforms 316L and 904L. The chromium content handles nitric acid (HNO₃) up to 70% concentration.
High Ni (38-46%) gives outstanding chloride SCC resistance. Molybdenum aids pitting and crevice resistance in chloride media. Titanium stabilisation prevents IGC during welding or exposure at 540-760°C. It is NACE MR0175 listed for sour oil and gas service.
Machining, Hot Working & Welding of Incoloy 825 Round Bar
Machine with carbide tooling at 30-45 m/min using water-base coolants. Hot work (forge) at 983-1094°C; do not work below 927°C to avoid carbide precipitation. Weld by GTAW, GMAW, SMAW, or SAW using ERNiFeCr-1 (AWS A5.14) or ENiCrMo-3 (AWS A5.11). No preheat required. Post-weld anneal at 955°C for maximum corrosion resistance.
Industries Using Incoloy 825 Round Bar & Rod
Incoloy 825 round bars and rods are critical in highly corrosive environments, serving 6 demanding applications across chemical, energy, marine, and process industries.
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Agitator shafts, pump shafts, valve stems, fasteners for H₂SO₄ and H₃PO₄ service.
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Downhole components, sour gas tubing hangers, NACE-compliant valve bars per API 6CRA.
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FGD scrubber internals, SO₂ absorber tower bars.
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Dissolver vessel agitator shafts in hot HNO₃.
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Propeller shafts, seawater-exposed fasteners.
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Tank heater bars and heat exchanger baffles.
How to Order Incoloy 825 Round Bar
To order Incoloy 825 Round Bar, provide these 12 important details:
- Product Form: Hot Rolled (HR) / Cold Drawn (CD) / Forged Round Bar
- Size: Diameter: 6mm to 500mm — specify diameter in mm and length
- Condition: Hot Rolled, Annealed / Cold Drawn, Annealed / Forged & Annealed
- Surface Finish: Black (as-rolled) / Bright Drawn / Turned & Polished / Centreless Ground (specify per application)
- Material Grade: Incoloy 825 / UNS N08825 / W.Nr. 2.4858
- Quantity: Total weight in kg or MT
- Standard: ASTM B425 / ASME SB-425, EN ISO 9723, ASME Section IX
- Documentation: MTC EN 10204 3.1/3.2, PMI Report, IGC Test Report, Mechanical Properties Report, TPI Certificate (Bureau Veritas / SGS / TÜV)
- Packaging: Bundled with steel strapping / wooden pallet with VCI wrap / ISPM 15 compliant export crating with clear heat/grade labelling
- Delivery Destination: Domestic
Frequently Asked Questions
What Makes Incoloy 825 Different from Incoloy 800 for Bar Applications?
Alloy 825 contains Mo (2.5-3.5%), Cu (1.5-3.0%), and higher Ni (38-46%) for reducing acid and chloride SCC resistance. Alloy 800 (Ni 30-35%, no Mo/Cu) is for high-temperature oxidation, not aqueous corrosion.
Is Incoloy 825 Bar Suitable for NACE Sour Service?
Yes. Incoloy 825 bar is listed in NACE MR0175 / ISO 15156 in the annealed condition with hardness ≤35 HRC. It resists SCC in H₂S environments.
Can Incoloy 825 Bar Be Age-Hardened?
No. Alloy 825 is solid-solution strengthened by cold work only. For an age-hardenable alternative, specify Incoloy 925 (N09925).
What Filler Metal is Recommended for Welding?
ERNiFeCr-1 (GTAW/GMAW) has a matching composition and is typically specified for welding. ENiCrMo-3 (SMAW) may be used where higher strength weld metal is required.
What is the Maximum Service Temperature?
The maximum service temperature for Incoloy 825 bar is approximately 540°C (1000°F). Above this, phase changes reduce ductility and impact strength. For higher temperatures, Incoloy 800H/HT is more suitable.
What is the Price of Incoloy 825 Bar per Kg in India?
Pricing varies with diameter, quantity, nickel/molybdenum market rates, and surface condition. Contact Nicorex Alloys for ex-Mumbai pricing and bulk discounts.
What IGC Test is Required for Chemical Processing Service?
ASTM A262 Practice E (Strauss test) verifies freedom from intergranular corrosion susceptibility. Ti stabilisation in Alloy 825 provides inherent IGC resistance when properly annealed.