Champak industries stocks alloy 825 plates or alloy 825 nickel alloy plate in thicknesses from.1875" (4.8mm) thru 2.00" (50.8mm) for corrosion resistant application within the air pollutants control, chemical and petrochemical, food processing, nuclear, offshore oil and gas manufacturing, ore processing, petroleum refining, metal pickling and waste disposal industries.
Alloy 825 Plates: Purchasing Specification
| Requirement | What to specify |
|---|---|
| Grade and form | Alloy 825 / UNS N08825 plate (W.Nr. 2.4858). |
| Product standard | ASTM B424 or ASME SB424; state the required edition and any supplementary requirements. |
| Published thicknesses | 3/16" to 2" (4.8mm to 50.8mm); individual sizes are listed below. |
| Condition and finish | Annealed; hot-rolled or cold-rolled; surface finish, thickness tolerance and flatness. |
| Processing | Full plate, cut piece or profile; drawing, quantity, edge finish and machining allowance. |
| Documents and inspection | Inspection certificate type, heat traceability, PMI, corrosion tests and third-party inspection where required. |
Available thicknesses for Alloy 825
| 3/16" | 1/4" | 3/8" | 1/2" | 5/8" | 3/4" |
|---|---|---|---|---|---|
| 4.8mm | 6.3mm | 9.5mm | 12.7mm | 15.9mm | 19mm |
| 1" | 1 1/4" | 1 1/2" | 1 3/4" | 2" | |
| 25.4mm | 31.8mm | 38.1mm | 44.5mm | 50.8mm |
Dimensions, Condition and Tolerances
Specify thickness × width × length and the number of plates or pieces. For profiles, provide a dimensioned drawing with units, revision and finished-part tolerances, and say whether sizes are finished dimensions or include a machining allowance.
ASTM B424 sets the permitted variations in thickness, width, length and flatness. Attach your own limits where they are tighter, and state the surface finish and edge condition you need.
Alloy 825 plates or alloy 825 (USN N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It became advanced to provide superb corrosion resistance in each oxidizing and decreasing environments. The alloy is immune to chloride stress-corrosion cracking and pitting. The addition of titanium stabilizes alloy 825 in opposition to sensitization in the as-welded situation making the alloy immune to inter-granular assault after publicity to temperatures in a range that could sensitize un-stabilized stainless steels. The fabrication of alloy 825 is typical of nickel-base alloys, with cloth being easily formable and weld-able through a spread of techniques.
Grade and claims: The correct designation is UNS N08825 (written “USN N08825” above). Alloy 825 was developed for good corrosion resistance in both oxidizing and reducing environments. It has high resistance to chloride stress corrosion cracking and resistance to intergranular attack after welding, but “immune” overstates it: its pitting and crevice resistance is moderate, and higher-molybdenum alloys such as Alloy 625 are used where chloride pitting is severe.
Why Select Alloy 825 Plates?
Alloy 825 is chosen for sulfuric and phosphoric acid, pickling and sour or seawater-cooled equipment where stainless steels crack or corrode too fast. Its nickel content resists chloride stress corrosion cracking, molybdenum and copper resist reducing acids, chromium resists oxidizing media and titanium stabilization protects welds. Compare it with the related grades below for your process.
| Consideration | Alloy 20 (N08020) | Alloy 825 (N08825) | Alloy 625 (N06625) |
|---|---|---|---|
| Nickel | 32–38% | 38–46% | 58% minimum |
| Molybdenum | 2–3% | 2.5–3.5% | 8–10% |
| Stabilization | Niobium | Titanium | Niobium (also strengthens) |
| Typical reason to choose | Sulfuric acid service | Wide range of oxidizing and reducing acids | Severe chloride pitting, seawater, higher strength |
These grades are not interchangeable. See Alloy 20 Plates and Alloy 625 Plates and compare corrosion data for your process. Incoloy® 825 is a Special Metals brand; generic Alloy 825 is not automatically that brand.
Applications
Air Pollution Control
- Scrubbers
Chemical Processing Equipment
- Acids
- Alkalis
Food Process Equipment
Nuclear
- Fuel Reprocessing
- Fuel Element Dissolvers
- Waste Handling
Offshore Oil and Gas Production
- Seawater Heat Exchangers
- Piping Systems
- Sour Gas Components
Ore Processing
- Copper Refining Equipment
Petroleum Refining
- Air-cooled Heat Exchangers
Steel Pickling Equipment
- Heating Coils
- Tanks
- Crates
- Baskets
Waste Disposal
- Injection Well Piping Systems
Specify the Conditions Behind the Application
The applications above are common uses of the material. Match the plate to your equipment’s actual media and design requirements.
| Duty | Information for selection |
|---|---|
| Pickling tanks, coils and baskets | Acid type and concentration, temperature, dissolved iron and chloride content. |
| Scrubbers and pollution control | Gas and condensate chemistry, chlorides, temperature and wet/dry cycling. |
| Offshore and sour gas | H₂S partial pressure, chlorides, temperature and ISO 15156-3 / NACE MR0175 limits. |
| Heat exchangers | Media on both sides, wall temperature, chlorides, pressure and design code. |
Standards
Alloy 825 plate is ordered to ASTM B424 or ASME SB424 for UNS N08825, with the required edition stated on the order.
-
ASTMB 424
Product specification
N08825 plate, sheet and strip: chemistry, mechanical properties, condition and tolerances.
-
ASMESB 424
Pressure-equipment code
The ASME Boiler and Pressure Vessel Code version of B424, named where code construction requires it.
Chemical Analysis
Typical Values (Weight %)
| Nickel | 38.0 min.–46.0 max. | Iron | 22.0 min. |
| Chromium | 19.5 min.–23.5 max. | Molybdenum | 2.5 min.–3.5 max. |
| Molybdenum | 8.0 min.-10.0 max. | Copper | 1.5 min.–3.0 max. |
| Titanium | 0.6 min.–1.2 max. | Carbon | 0.05 max. |
| Niobium (plus Tantalum) | 3.15 min.-4.15 max. | Titanium | 0.40 |
| Carbon | 0.10 | Manganese | 1.00 max. |
| Sulfur | 0.03 max. | Silicon | 0.5 max. |
| Aluminium | 0.2 max. |
Correction – do not use four of these rows for Alloy 825: “Molybdenum 8.0–10.0”, “Niobium (plus Tantalum) 3.15–4.15”, “Titanium 0.40” and “Carbon 0.10” are Alloy 625 values. For Alloy 825 the correct limits are molybdenum 2.5–3.5%, titanium 0.6–1.2% and carbon 0.05% maximum, as in the other rows; niobium is not specified. The caption says “Typical Values”, but the entries are specification limits.
| Element | Limit | Element | Limit |
|---|---|---|---|
| Nickel | 38.0–46.0 | Iron | 22.0 min. |
| Chromium | 19.5–23.5 | Molybdenum | 2.5–3.5 |
| Copper | 1.5–3.0 | Titanium | 0.6–1.2 |
| Carbon | 0.05 max. | Manganese | 1.0 max. |
| Sulfur | 0.03 max. | Silicon | 0.5 max. |
| Aluminium | 0.2 max. |
Mechanical Properties
Typical Room Temperature Mechanical Properties, Mill Annealed
| Yield Strength 0.2% Offset |
Ultimate Tensile Strength |
Elongation in 2 in. |
Hardness | ||
|---|---|---|---|---|---|
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | Rockwell B |
| 49,000 | 338 | 96,000 | 662 | 45 | 135-165 |
Reading this table: The values are typical, although the column headings say “(min.)”. ASTM B424 minimums for annealed plate are 85 ksi (586 MPa) tensile, 35 ksi (241 MPa) yield and 30% elongation. The hardness figures 135–165 correspond to the Brinell scale, not Rockwell B.
| Temperature,°F | 70 | 400 | 600 | 800 | 1000 | 1200 | 1400 | 1600 |
|---|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength, ksi | 144 | 134 | 132 | 132 | 130 | 119 | 78 | 40 |
| 0.2% Yield Strength, ksi | 84 | 66 | 63 | 61 | 61 | 60 | 59 | 39 |
| Elongation, % | 44 | 45 | 42.5 | 45 | 48 | 34 | 59 | 117 |
Correction: This elevated-temperature table, and the rupture table below, repeat the Alloy 625 bar values shown on our Alloy 625 Plates page. Alloy 825 has lower strength than Alloy 625, so do not use these figures for Alloy 825. Request producer data or code allowable stresses for elevated-temperature design.
Typical Rupture Strength Bar, Stress to Rupture at Indicated Time
| Temperature, °F | 1200 | 1300 | 1400 |
|---|---|---|---|
| 100 Hours, ksi | 59 | 34 | 18 |
| 1,000 Hours, ksi | 43 | 23 | 12 |
INCONEL and INCOLOY are registered trademarks of Special Metals (PCC)
Cutting, Fabrication and Welding
Champak Industries describes full and part plate/profile supply and a plasma-cutting service. Send drawings, piece quantities, tolerances, edge finish and machining allowances for your Alloy 825 requirement.
Forming and machining
Alloy 825 forms like austenitic stainless steel but work-hardens, so use rigid set-ups, sharp tools and positive feeds. It is not hardened by heat treatment; follow the producer’s guidance for any annealing after heavy forming.
Welding
Weld with a qualified procedure. Over-alloyed fillers such as ERNiCrMo-3 are commonly used so the weld resists corrosion at least as well as the plate. Clean joints and control heat input.
Testing, Certificates and Heat Traceability
Specify the inspection-document type and heat identification when ordering. Request chemistry, mechanical results, dimensions and condition to the governing specification, so the certificate confirms the correct Alloy 825 limits. For cut pieces, state how identification must be carried from the parent plate to each piece.
| Requirement | What to identify in the order |
|---|---|
| Inspection document | Certificate type (for example EN 10204 3.1 or 3.2) showing heat number, chemistry, mechanical results and condition |
| Heat traceability | Heat marking on each plate and how it is transferred to cut pieces |
| Corrosion and sour-service tests | Intergranular corrosion test or ISO 15156-3 / NACE MR0175 compliance, with method and acceptance criteria, if required |
| PMI and inspection | Positive material identification, dimensional checks and any buyer or third-party witness |
A management-system certificate is separate from a material inspection certificate or project approval. See the company’s Quality Policy for its published policy.
Source Alloy 825 Plates from Champak Industries
Champak Industries’ company profile records its establishment in Mumbai in 1978 and its stockist, import and export activities. This page lists Alloy 825 plate from 3/16" to 2", and it can be requested in one enquiry with the other high nickel alloy plates. Submit the complete material and inspection specification with your enquiry.
What Determines the Alloy 825 Plate Quotation?
Nickel, molybdenum and copper prices, thickness, plate size, quantity, specification, required brand or source, cutting, testing and documentation all affect the quotation. Include the destination and packing requirements, and say whether pricing is needed per kilogram, per plate or per finished piece.
Packing, Dispatch and Export Requirements
Give the delivery address, required date and unloading constraints. Specify protective packing that keeps the plate away from carbon-steel contamination, piece identification and handling needs. For export orders, include the destination port, delivery terms and document list.
Alloy 825 Plates: Frequently Asked Questions
01What is the UNS number for Alloy 825?
Alloy 825 is UNS N08825, also identified as W.Nr. 2.4858. It is a titanium-stabilized nickel-iron-chromium alloy with molybdenum and copper.
02Is Alloy 825 the same as Incoloy 825?
Incoloy® 825 is Special Metals’ trade name for UNS N08825. Generic Alloy 825 plate meets the same UNS grade but is not automatically that brand, so name the brand if your project requires it.
03Which specification should I state for Alloy 825 plate?
State ASTM B424 or ASME SB424 with UNS N08825 and the required edition.
04Which thicknesses are listed?
The published range is 3/16" to 2" (4.8mm to 50.8mm), with 11 listed thicknesses. Send the width, length and quantity you need with the thickness.
05How much molybdenum does Alloy 825 contain?
2.5–3.5% under ASTM B424. The 8.0–10.0% figure that also appears in the original table belongs to Alloy 625.
06When should I choose Alloy 825 over Alloy 625?
Alloy 825 is often chosen for sulfuric and phosphoric acid and pickling service at lower cost. Alloy 625 is preferred where chloride pitting is severe or higher strength is needed.
07Can Alloy 825 plate be welded?
Yes. Titanium stabilization protects the heat-affected zone, and over-alloyed fillers such as ERNiCrMo-3 are commonly used with a qualified procedure.
08Are the properties on this page test results for the plate supplied?
No. They are reference values, and some rows are corrected in the notes. Request the heat-specific inspection certificate for the plate supplied.
09Can Alloy 825 plate be cut to size?
Yes. Send a drawing or the sizes, quantity, tolerances and edge requirements, and state how heat identification must be carried onto each piece.
10How do I get a price and delivery date?
Send the specification, sizes, quantity, cutting, inspection requirements, destination and required date through the enquiry form below, by WhatsApp or by phone.