Acid resistance
Useful resistance to sulfuric and phosphoric acids and to a range of reducing environments.
Nickel-iron-chromium-molybdenum-copper alloy
Alloy 825 Plate, Sheet and Round Bar
A corrosion-resistant nickel-iron-chromium alloy with molybdenum, copper and titanium for acid handling, chloride resistance and chemical-process equipment.
Representative product-form image. Confirm actual surface, dimensions and condition with the quotation.Material overview
Why industrial buyers specify Alloy 825
Alloy 825 is designed for resistance across reducing and oxidizing conditions. Nickel supports resistance to chloride-ion stress-corrosion cracking, molybdenum and copper improve resistance to reducing acids, chromium supports oxidizing resistance, and titanium helps stabilize the alloy against sensitization.
Localized corrosion
Molybdenum supports resistance to pitting and crevice corrosion.
Stabilization
Titanium helps control sensitization and intergranular-corrosion risk after appropriate heat treatment.
Technical reference
Composition and purchasing data
Values below are published reference limits. The purchase order, applicable specification and mill test certificate control the supplied material.
Limiting chemical composition, weight %
| Element | Published 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 |
| Manganese | 1.0 max |
| Silicon | 0.5 max |
| Aluminum | 0.2 max |
| Carbon | 0.05 max |
Key material facts
- Designation
- UNS N08825; W.Nr. 2.4858
- Density
- 8.14 g/cm3
- Strengthening
- Corrosion-focused, titanium-stabilized wrought alloy; not normally selected as an age-hardening grade.
- Temperature note
- Temperature suitability must be evaluated together with acid concentration, contaminants, stress and corrosion mechanism.
- Common supply
- Plate, sheet, strip, round bar, flat bar and cut-to-size material
Technical reference: manufacturer technical bulletin. Typical data is for material selection only and is not a design guarantee.
Common specifications
Standards buyers frequently reference
Specification editions and permitted product forms change. Send the exact standard, revision and condition shown on your drawing or material list.
| Product or requirement | Common reference |
|---|---|
| Plate, sheet and strip | ASTM B424 |
| Rod and bar | ASTM B425 |
| Seamless pipe and tube | ASTM B423 |
| Forgings and fittings | ASTM B564 |
Availability is subject to grade, size, quantity, condition, certification and mill route. No standard listed here confirms stock.
Application areas
Where Alloy 825 is commonly evaluated
Final material selection belongs to the buyer's qualified engineer and must consider temperature, stress, fabrication, corrosion medium and governing code.
Chemical processing
Acid-handling vessels, piping, heat exchangers and process equipment.
Oil and gas
Recovery equipment and components exposed to aggressive process fluids.
Pollution control
Scrubbers and equipment handling corrosive waste streams.
Pickling and acid production
Tanks, coils and process hardware for sulfuric or phosphoric acid service.
RFQ checklist
Information needed for an accurate quotation
Clear specifications shorten material matching and reduce repeated email clarification.
1. Grade and standard
Alloy 825, UNS N08825, ASTM/AMS/EN standard and required revision.
2. Product and dimensions
Plate, sheet, strip, round bar, flat bar and cut-to-size material. Include thickness, width, length, diameter and tolerances.
3. Condition
Solution-annealed condition to the applicable product specification
4. Quantity
Pieces, kilograms or total project quantity, plus any trial-order requirement.
5. Inspection
MTC type, chemistry, mechanical tests, NDT, dimensional report and third-party inspection.
6. Delivery
Destination country or port, required date, packing and Incoterm preference.
Fast alloy inquiry
Send your Alloy 825 size, quantity and destination.
We will review product form, specification, condition, certification and delivery requirements before preparing a targeted quotation.
Buyer questions
Alloy 825 FAQ
Quick answers for initial sourcing. Confirm critical engineering requirements against the governing specification.
What acids is Alloy 825 commonly considered for?
It is widely considered for sulfuric and phosphoric acid service, but concentration, temperature, aeration and impurities must be evaluated for the actual application.
What is the role of titanium in Alloy 825?
Titanium helps stabilize the alloy against sensitization and supports resistance to intergranular attack after suitable heat treatment.
Which standard applies to Alloy 825 plate?
ASTM B424 is a common plate, sheet and strip specification. Always state the required edition, dimensions and condition.
Related grades
Compare other core alloy pages
Use related pages to compare alloy families before sending your final material requirement.