Incoloy 825 (UNS N08825 / 2.4858) Nickel-Iron-Chromium Alloy Forged Ring
Product Details
| Grade: | UNS N08825 ; W.Nr. 2.4858 ; GB NS1404 / NS825 ; JIS NCF825 | Standard: | ASTM B564 / ASME SB564 (forged Fittings, Flanges, Rings) |
|---|---|---|---|
| OD (mm): | 100 – 3,000 Mm (custom) | Height (mm): | Per Customer Drawing |
| Surface: | As Forged / Machined / Ground / Polished | Delivery Conditins: | Hot Forged + Solution Annealed, Stress‑Relieved, Pickled |
Product Description
- Fully forged Incoloy 825 nickel iron chromium alloy ring, UNS N08825 / EN 2.4858 standard, manufactured per ASTM B564 forging specification
- Composite Cr-Mo-Cu-Ti formula provides dual resistance to both oxidizing & reducing acid corrosive media
- Titanium stabilized matrix eliminates intergranular corrosion risk after welding or long high-temperature exposure
- Excellent anti-pitting, crevice & chloride stress corrosion cracking performance for seawater and sour gas service
- Outstanding durability in sulfuric, phosphoric, mixed acid and waste flue gas desulfurization environments
- Uniform continuous grain flow from seamless ring rolling & open-die forging, stable high mechanical integrity
- Custom OD, ID, height & full CNC turning/milling machining per customer CAD/PDF drawings
- Complete batch inspection with EN 10204 3.1 MTC report, long service life for chemical & offshore equipment
This series of Incoloy 825 forged rings are produced by open-die hammer forging and radial-axial seamless ring rolling processes. After full solution annealing and stress relief heat treatment, the ring obtains continuous compact grain flow without internal forging defects, ensuring uniform mechanical and anti-corrosion performance across the whole blank.
Incoloy 825 is versatile Fe-Ni base alloy integrated with molybdenum, copper and titanium elements. It fills the performance gap between ordinary 316L stainless steel and high-cost Hastelloy alloys. It works stably in oxidizing nitric acid and reducing sulfuric acid simultaneously, and shows reliable anti-sulfide stress cracking capacity for oil & gas sour service. Forged ring blanks are widely machined into flanges, tube sheets, sealing support rings and pressure vessel internal components for chemical, power FGD, marine desalination and nuclear industries.
- Nickel-iron-chromium alloy added with Mo, Cu and Ti composite anti-corrosion elements
- Unique copper-molybdenum combination delivers excellent tolerance to sulfuric & phosphoric reducing acids
- Chromium element guarantees stable anti-corrosion performance in nitric acid oxidizing environments
- Titanium stabilizer prevents carbide precipitation, no sensitization after welding & thermal cycling
- High nickel matrix effectively blocks chloride induced SCC, suitable for brine and seawater equipment
- Good hot forging, cold machining and welding performance without post-weld heat treatment requirement
| Grade | EN Standard No. | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni | Mo | Cu | Ti | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Incoloy 825 | 2.4858 | 0.05 | 0.50 | 1.00 | 0.03 | 0.015 | 19.5–23.5 | 38.0–46.0 | 2.50–3.50 | 1.50–3.00 | 0.60–1.20 | Balance |
| Property | Incoloy 825 Forged Ring |
|---|---|
| Delivery Condition | Hot Forged / Ring Rolled, Solution Annealed, Stress‑Relieved, Pickled |
| Minimum Tensile Strength | ≥586 MPa (85 ksi) |
| Minimum 0.2% Yield Strength | ≥241 MPa (35 ksi) |
| Minimum Elongation (50mm gauge) | ≥30 % |
| Maximum Brinell Hardness | ≤220 HB |
- Incoloy Series: 800, 800H, 800HT, 825, 925, G-3, Alloy 20
- Inconel Series: 600, 601, 625, 690, 718, X750, HX
- Hastelloy Series: C4, C22, C276, C2000, B2, B3, G35
- Monel & Pure Nickel: Monel 400 / K-500, Nickel 200 / 201
- Duplex / Austenitic Stainless Steel: 2205, 2507, 304, 316L, 904L
- PH Stainless Steel: 17-4PH, 15-5PH, 17-7PH
- Alloy & Carbon Steel: 4140, 4340, F22, F91, A105, A516 Gr.70
Simultaneously stable in nitric acid (oxidizing) and sulfuric/phosphoric acid (reducing), fills the material gap between stainless steel and expensive Hastelloy grades.
Titanium addition restricts carbide segregation; welded forged rings keep full anti-corrosion capacity without post heat treatment.
High nickel content effectively resists pitting and sulfide stress cracking, certified for offshore and sour oil & gas working media.
Ring rolling & heavy reduction forging forms uninterrupted metal fiber, greatly improves fatigue and pressure bearing capacity of ring blanks.
Suitable for mixed acid, flue gas, seawater and nuclear waste treatment equipment, reduces equipment replacement frequency and maintenance cost.
- Chemical reactor tube sheet forged rings, acid heat exchanger flange blanks
- Power plant FGD flue gas desulfurization equipment support rings
- Offshore platform & seawater desalination pressure vessel ring components
- Oil & gas sour well pipeline connecting flanges and sealing rings
- Nuclear fuel reprocessing & radioactive waste equipment forged blanks
- Pickling line and phosphoric acid production furnace holding rings
- High-pressure chemical pump, valve body and bearing support rings
We provide integrated open-die forging & seamless ring rolling production, full CNC precision machining per customer CAD/PDF drawings:
- Ring blank rough cutting, facing, inner & outer diameter turning, height milling
- Precision boring, grooving, drilling, threading, chamfering & polishing
- Solution annealing, stress relief heat treatment customization
- Surface pickling, passivation and mirror finishing treatment
We supply finished Incoloy 825 forged rings, flanges, tube sheets and annular support parts for chemical, energy and nuclear global clients.
- UT Ultrasonic Testing to detect internal forging lamination & crack defects
- Tensile, yield and hardness mechanical performance full batch testing
- High-precision caliper & coordinate measuring machine for OD/ID/height tolerance inspection
- Spectrometer full spectrum chemical composition analysis per heat lot
- Metallographic microscope grain flow & microstructure observation
Mill Test Certificate EN 10204 3.1 can be issued and delivered together with shipment documents before delivery.
- Inner: Waterproof anti-rust plastic film wrap + individual plastic protective sleeves
- Outer: Reinforced fumigated wooden pallet / wooden case with separation blocks to avoid collision deformation
- Custom heavy-duty export packaging available upon customer request
Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on ring OD/ID size, height, order quantity and custom machining requirements.
Product Highlights
Product Highlights Fully forged Incoloy 825 nickel iron chromium alloy ring, UNS N08825 / EN 2.4858 standard, manufactured per ASTM B564 forging specification Composite Cr-Mo-Cu-Ti formula provides dual resistance to both oxidizing & reducing acid corrosive media Titanium stabilized matrix ...
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