ASTM B425 | UNS N08825 | DIN 2.4858 | ASME SB425
Incoloy 825 Round Bar (UNS N08825) is an austenitic Ni-Fe-Cr alloy stabilised with titanium and alloyed with molybdenum and copper — delivering dual-environment corrosion resistance in both reducing acids (H2SO4, H3PO4) and oxidising media at service temperatures from cryogenic conditions to 550C in continuous structural duty. This Ni superalloy is stabilized with Ti and alloyed with Mo and Cu that provide outstanding resistance to stress corrosion cracking, pitting, crevice corrosion and intergranular corrosion, even in oxidising and reducing acids.
Unifit Fastener Incoloy 825 Round Bars are available in diameters ranging from 3 mm to 800 mm and are up to 6000 mm long. They are available in hot-rolled, cold-drawn, bright, polished, forged and black finishes and are in accordance with UNS N08825, Werkstoff Nr. International standards include 2.4858, DIN, JIS, BS, GOST and AFNOR.
From Mumbai India to all over the world, We can deliver certified material with full Mill Test reports, 3rd party inspection and rapid delivery for precision-machined parts in heat exchanger, sour-gas oil and gas equipment, chemical processing reactor or nuclear waste handling system.
Request a QuoteTable of Content
- Various Types of Incoloy 825 Bars
- Equivalent Grade Reference Table
- Technical Specifications
- Size Chart & Tolerances
- Chemical Composition
- Mechanical & Physical Properties
- Surface Finishes & Delivery Conditions
- Industries & Applications
- Incoloy 825 vs Competing Alloys
- Quality Assurance & Certifications
- Weight Chart
- Indicative Price List
- Manufacturing Process & Supply Chain
- FAQs About Incoloy 825 Round Bar
Various Types of Incoloy 825 Bars Supplied by Unifit Fastener
ASTM B425 UNS N08825 Incoloy 825 Rod
Incoloy 825 Hex Bar
Incoloy 825 Square Bar
Incoloy 825 Flat BarIncoloy 825 Forged BarIncoloy 825 Bright BarIncoloy 825 Cold Drawn BarIncoloy 825 Polished Round BarIncoloy 825 Threaded BarIncoloy 825 Hollow BarIncoloy 825 Black BarIncoloy 825 Half-Round BarIncoloy 825 Triangle BarIncoloy 825 Rectangular BarIncoloy 825 BilletIncoloy 825 IngotIncoloy 825 Hot Rolled BarIncoloy 825 Centreless Ground BarIncoloy 825 Rough Turned BarIncoloy 825 Solution Annealed BarDIN 2.4858 Incoloy 825 Round BarEquivalent Grade Reference Table
| Standard | Designation | UNS No. | JIS | BS | GOST | AFNOR | EN / Werkstoff | ASTM / ASME |
| Incoloy 825 | Incoloy 825 | N08825 | NCF 825 | NA 16 | ЭП703 | NFE30C20DUM | NiCr21Mo / 2.4858 | ASTM B425 / ASME SB425 |
ASME SB425 / ASTM B425 Incoloy 825 Round Bar Specifications
| Parameter | Details |
| Standard / Specification | ASTM B425 / ASME SB425 / EN / DIN / JIS / BS / AISI / GOST |
| Grade | Incoloy 825 (UNS N08825 / Werkstoff Nr. 2.4858) |
| Size (Diameter) | 3 mm to 800 mm |
| Length | 100 mm to 6000 mm & custom cut lengths |
| Tolerance | H8, H9, H10, H11, H12, H13 / K9, K10, K11, K12 (per ISO 286 / DIN 7152) or as per client requirement |
| Finish | Black, Bright Polished, Rough Turned, No. 4 Finish, Matt Finish, BA Finish, Hairline |
| Form | Round, Square, Hex (A/F), Rectangle, Flat, Billet, Ingot, Forging |
| Surface | Hot Rolled Pickled / Sand Blast Finished / Cold Drawn / Bright / Polished |
| Condition | Cold Drawn Polished, Cold Drawn Centreless Ground & Polished, Annealed, Solution Annealed |
| Heat Treatment | Annealed, Solution Annealed, Hardened & Tempered |
| Crack Test | Magnetic Particle Inspection (MPI) |
Size Chart – Incoloy 825 Round Bar (Selected Sizes)
| Dia (in) | Wt/metre (kg) | Dia (in) | Wt/metre (kg) |
| 3" | 36.00 | 6" | 146.00 |
| 3-1/4" | 42.90 | 6-1/2" | 172.00 |
| 3-1/2" | 49.80 | 7" | 199.00 |
| 4" | 65.00 | 8" | 260.00 |
| 5" | 102.00 | 10" | 406.00 |
| 5-1/2" | 123.00 | 12" | 585.00 |
Hot Forged Bar Tolerances (DIN Standard)
| Size Range (mm) | Group 1 Tolerance | Group 2 Tolerance |
| >50 to ≤60 | +1.05 / -1.00 | +2.00 / -1.00 |
| >60 to ≤80 | +2.00 / -1.00 | +2.05 / -1.00 |
| >80 to ≤100 | +2.05 / -1.00 | +3.00 / -1.00 |
| >100 to ≤120 | +2.05 / -1.05 | +3.00 / -1.05 |
| >140 to ≤160 | +3.00 / -2.00 | +4.00 / -2.00 |
| >200 to ≤220 | +5.00 / -3.00 | +6.00 / -3.00 |
| >250 to ≤300 | +8.00 / -3.00 | +9.00 / -3.00 |
Incoloy 825 UNS N08825 Chemical Composition (wt%)
| Element | Symbol | Content (%) |
| Nickel | Ni | 38.0 – 46.0 |
| Chromium | Cr | 19.5 – 23.5 |
| Iron | Fe | 22.0 min |
| Molybdenum | Mo | 2.5 – 3.5 |
| Copper | Cu | 1.5 – 3.0 |
| Titanium | Ti | 0.6 – 1.2 |
| Manganese | Mn | 1.0 max |
| Silicon | Si | 0.5 max |
| Aluminium | Al | 0.2 max |
| Carbon | C | 0.05 max |
| Sulphur | S | 0.03 max |
Note: Mo content is typically 2.5–3.5% as per UNS N08825 specification. Some sources list the Mb (Mo) range as 2.5–3.5. All values conform to ASTM B425 / ASME SB425.
Physical Properties of Incoloy 825
| Property | Value |
| Density | 8.14 g/cm³ (0.294 lb/in³) |
| Melting Point | 1370°C – 1400°C (2500°F – 2550°F) |
Mechanical Properties – Annealed Condition
| Property | Imperial (psi) | Metric (MPa) |
| Tensile Strength | 85,000 psi (min) | 586 MPa |
| Yield Strength (0.2% Offset) | 35,000 psi (min) | 241 MPa |
| Elongation | 30% (min) | 30% (min) |
| Hardness (Brinell) | – | – |
Surface Finishes & Delivery Conditions
| Code | Condition | Code | Condition |
| CD | Cold Drawn | P | Polished |
| BD | Bright Drawn | SRE | Slit Rolled Edge |
| CG | Centreless Ground | HF | Hot Finished |
| CF | Cold Finished | HRAP | Hot Rolled Annealed & Pickled |
| P&T | Peeled & Turned | RT | Rough Turned / Peeled |
| ST | Smooth Turned | PR | Peeled & Reeled |
Industries & Applications
Incoloy 825's combination of high nickel content, chromium, molybdenum, and copper makes it the preferred alloy wherever both reducing and oxidising corrosion are present simultaneously.
Industry-wise Application Summary
| Industry | Specific Application |
| Oil & Gas | Downhole tubing, wellhead components, sour-gas handling equipment, flowlines |
| Chemical Processing | Heat exchangers, reactor vessels, piping, distillation columns |
| Petrochemical | Hydrocarbon cracking units, refinery process equipment |
| Nuclear Energy | Spent fuel reprocessing, nuclear waste containment, control rod assemblies |
| Marine / Offshore | Seawater handling systems, pump shafts, propeller shafts |
| Pollution Control | Flue-gas desulphurisation (FGD) scrubbers, effluent treatment |
| Food Processing | Sterilisation equipment, food-grade reactor linings |
| Pulp & Paper | Digesters, bleaching equipment, process vessels |
| Aerospace / Defence | High-temperature structural components, exhaust systems |
| Power Generation | Boiler feed-water heaters, superheater tubes, turbine parts |
Incoloy 825 vs Competing Alloys (Comparison)
| Property | Incoloy 825 | 316L SS | Incoloy 800 | Hastelloy C276 |
| Ni Content (%) | 38–46 | 10–14 | 30–35 | 57 (bal.) |
| Cr Content (%) | 19.5–23.5 | 16–18 | 19–23 | 14.5–16.5 |
| Mo Content (%) | 2.5–3.5 | 2–3 | None | 15–17 |
| Max Service Temp. | ~550°C | ~870°C (oxidising) | ~900°C | ~1038°C |
| HCl Resistance | Excellent | Fair | Poor | Excellent |
| H2SO4 Resistance | Excellent | Fair | Poor | Excellent |
| HNO3 Resistance | Good | Good | Excellent | Poor |
| Cl- SCC Resistance | Excellent | Poor | Good | Excellent |
| Cost Index | Medium-High | Low | Medium | Very High |
| NACE MR0175 | Yes | No | No | Yes |
Incoloy 825 max. service temp 550C represents practical structural service in aqueous corrosive media. Oxidation resistance limit in air is approximately 982C, however continuous high-temperature dry-gas service above 550C is not recommended. Selection should be based on the specific corrosion environment.
Quality Assurance & Certifications
Unifit Fastener operates a fully documented quality management system certified to ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018. All Incoloy 825 Round Bars are supplied with:
- Mill Test Certificate (MTC) with full chemical & mechanical analysis
- EN 10204 3.1 / 3.2 Material Test Reports on request
- Third-party inspection: SGS, Bureau Veritas, Lloyds Register, TÜV, DNV
- Positive Material Identification (PMI) Testing
- Ultrasonic Testing (UT) per ASTM A388
- Magnetic Particle Inspection (MPI) for surface defects
- Dimensional inspection report per customer drawing
- NACE MR0175 / ISO 15156 compliance certificates
- PED 2014/68/EU and Government of India Recognised Export House certification
International Standards Compliance
| Standard Body | Standard / Specification |
| ASTM / ASME | B425, SB425 |
| DIN | DIN 2.4858, DIN 17752, DIN 17753, DIN 17754 |
| BS | NA 16, BS 3076 |
| ISO | ISO 9723, ISO 9724, ISO 9725 |
| JIS | NCF 825 |
| GOST | ЭП703 |
| VdTÜV | VdTÜV 432 |
| NACE | MR0175 / ISO 15156 |
Weight Chart (Incoloy 825 Round Bar)
Weight Per Foot and Per Metre – Common Sizes
| Size | Kg/Foot | Kg/Metre | Size | Kg/Foot | Kg/Metre |
| 3mm | 0.017 | 0.055 | 25mm | 1.180 | 3.871 |
| 5mm | 0.047 | 0.154 | 30mm | 1.691 | 5.548 |
| 8mm | 0.120 | 0.398 | 40mm | 3.009 | 9.872 |
| 10mm | 0.189 | 0.620 | 50mm | 4.698 | 15.414 |
| 12mm | 0.271 | 0.889 | 60mm | 6.768 | 22.205 |
| 16mm | 0.481 | 1.578 | 75mm (3") | 10.900 | 35.762 |
| 20mm | 0.753 | 2.470 | 100mm (4") | 19.306 | 63.340 |
| 22mm | 0.908 | 2.979 | 150mm (6") | 43.860 | 143.900 |
Indicative Price List
Incoloy 825 Round Bar price depends on diameter, finish, quantity, and prevailing nickel market rates. The following FOB prices are indicative only — contact Unifit Fastener for a live quotation.
| Product Description | Price (USD/kg) | Price (INR/kg, approx.) |
| Hot Worked Incoloy 825 Rods, Annealed & Pickled | $12–$16 | INR 1,000–1,350 |
| Nickel Alloy 825 Round Bar (50.8–125mm × 3000mm) | $9.83–$14 | INR 820–1,170 |
| Bar Alloy 825 DIA 3.0–54.86mm/per kg | $12.65–$18 | INR 1,050–1,500 |
| Standard ASTM B425 Incoloy 825 Bar/Rod | $10–$55/pc | INR 840–4,600 |
| High Quality Hot Rolled Incoloy 825 Round Rod | $20–$30 | INR 1,680–2,520 |
| Incoloy 825 Bright Rod (39–80 / kg) | $39–$80 | INR 3,280–6,720 |
| 825 Incoloy Forged Bars (Custom) | $40–$80 | INR 3,360–6,720 |
Disclaimer: Prices are FOB Mumbai, subject to change without notice. Request a formal quotation for project-specific pricing with MTC.
How Unifit Fastener Supplies Incoloy 825 Round Bars
| Step | Process | Quality Checkpoint |
| 1 | Raw material procurement from approved mills (Special Metals, VDM, Haynes) | Heat certificate verification |
| 2 | Hot rolling / forging to rough size | Dimensional check, visual inspection |
| 3 | Annealing / solution annealing heat treatment | Hardness test, microstructure review |
| 4 | Cold drawing / centreless grinding / peeling | Straightness, surface roughness (Ra) |
| 5 | Cut-to-length as per customer order | Length & weight verification |
| 6 | PMI (Positive Material Identification) testing | XRF alloy confirmation |
| 7 | Third-party inspection (optional) | SGS / BV / TÜV certificate |
| 8 | Packing & marking per ASTM / customer spec | Shipping mark, country of origin |
FAQs About Incoloy 825 Round Bar
Incoloy 825 Round Bar is a nickel-iron-chromium alloy bar product (UNS N08825, Werkstoff 2.4858) alloyed with molybdenum, copper, and titanium. It offers exceptional resistance to corrosion in both oxidising and reducing chemical environments, making it suitable for aggressive industrial applications in oil & gas, chemical processing, and marine sectors.
The UNS designation is N08825 and the German Werkstoff number is 2.4858. It is also known as NCF 825 (JIS), NA 16 (BS), and NFE30C20DUM (AFNOR).
We stock diameters from 3 mm to 800 mm with lengths from 100 mm to 6000 mm. Custom cut-to-length, forged, and near-net shape sizes are available on order. Weight capacity for forged rounds is up to 20,000 lbs.
Prices typically range from USD $10 to $80 per kg depending on diameter, finish, and quantity. In INR, indicative prices are Rs. 840 to Rs. 6,720 per kg. Contact Unifit Fastener for a firm quotation with current nickel prices factored in.
Our bars conform to ASTM B425, ASME SB425, DIN 2.4858, EN NiCr21Mo, JIS NCF 825, BS NA 16, ISO 9723/9724/9725, VdTÜV 432, and GOST ЭП703. We also supply NACE MR0175-compliant material for sour-service applications.
Incoloy 825 has a lower nickel base (38–46% vs 58%+ for Inconel 625) which makes it more economical. It excels in reducing acids (H2SO4, H3PO4) where Inconel 625 offers less advantage. Hastelloy C276 provides superior oxidising acid resistance and higher temperature capability but at significantly higher cost. For balanced corrosion resistance at medium cost, Incoloy 825 is often the optimal choice.