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Corrosion Resistant Incoloy 825 Cold Rolled Strip for Heat Exchanger Plates (0.1-3.0mm)
Engineered for severe thermal and acidic environments, DLX Alloy provides ultra-flat, high-formability Incoloy 825 cold rolled strips (0.1mm–3.0mm). Optimized for chevron-pattern heat exchanger plate stamping with exceptional resistance to pitting, stress corrosion cracking, and sulfuric acid corrosion.
- Overview
- Features
- Specifications
- Applications
- Why-Us
- FAQ
- Recommended Products
Product Overview: High-Purity Incoloy 825 Cold Rolled Alloy Strip
Incoloy 825 (UNS N08825 / W.Nr. 2.4858 equivalent chemistry) is an advanced austenitic nickel-iron-chromium alloy fortified with molybdenum, copper, and titanium. When processed into cold rolled strip form, it delivers unmatched performance in heat transfer applications operating under aggressive chemical and thermal conditions.
In plate-type heat exchangers, plate materials are continuously subjected to turbulent cross-flow media, high thermal gradients, and aggressive ions such as chlorides, sulfates, and phosphoric acids. Ordinary stainless steels frequently suffer from localized pitting, crevice corrosion, and catastrophic stress-corrosion cracking (SCC). Our corrosion resistant Incoloy 825 cold rolled strip solves these challenges by combining high nickel content (38.0% - 46.0%) for stress corrosion resistance with balanced chromium and molybdenum additions for superior oxidizing and reducing acid resistance.
Manufactured via high-vacuum induction melting (VIM) followed by electroslag remelting (ESR), our Incoloy 825 strips exhibit ultra-clean grain structures, extremely low inclusion levels, and uniform mechanical properties across the entire coil width and length. This metallurgical consistency guarantees flawless deep-drawing performance when stamping complex chevron or herringbone corrugation patterns without micro-cracking or edge splitting.
Key Engineering Features: Why Corrosion Resistant Incoloy 825 Excels
1. Superior Resistance to Reducing & Oxidizing Acids
The balanced alloy matrix provides exceptional resistance to sulfuric, phosphoric, and nitric acids. Intentional copper and chromium additions ensure long-term stability across severe chemical streams.
2. High Immunity to Chloride Stress Corrosion Cracking
With 38%+ nickel and optimized molybdenum, this corrosion resistant Incoloy 825 cold rolled strip prevents chloride pitting, crevice corrosion, and stress cracking in marine and wastewater systems.
3. Precision Formability for Deep-Drawing Corrugation
Featuring an ultra-fine grain structure and high uniform elongation (A50 ≥ 35%), the strip supports complex chevron-pattern stamping without micro-tears or edge cracking.
4. Ultra-Smooth Surface Finish & Thermal Efficiency
Delivered with bright annealed finishes (Ra ≤ 0.35 μm), the low-roughness surface minimizes foulant scaling, prevents biological adhesion, and maintains optimal heat transfer efficiency.
Technical Specifications
Chemical Composition (Typical Weight %)
| Element | Content (%) | Function / Characteristic |
|---|---|---|
| Nickel (Ni) | 38.0 – 46.0 | Base matrix for stress corrosion cracking resistance |
| Iron (Fe) | Balance (22.0 – 34.0) | Base structural matrix |
| Chromium (Cr) | 19.5 – 23.5 | Oxidation and nitric acid resistance |
| Molybdenum (Mo) | 2.5 – 3.5 | Pitting and crevice corrosion resistance |
| Copper (Cu) | 1.5 – 3.0 | Enhanced passivity in reducing sulfuric acid |
| Titanium (Ti) | 0.6 – 1.2 | Intergranular corrosion stabilization |
| Carbon (C) | ≤ 0.030 | Ultra-low carbon to prevent carbide precipitation |
| Manganese (Mn) | ≤ 1.00 | Deoxidizer & grain refinement |
| Silicon (Si) | ≤ 0.50 | Process stabilization |
| Phosphorus (P) | ≤ 0.020 | High-purity control limit |
| Sulfur (S) | ≤ 0.010 | High-purity control limit |
| Aluminum (Al) | ≤ 0.20 | Deoxidation agent |
Physical & Mechanical Properties (Annealed Condition)
| Parameter | Value / Range | Notes / Conditions |
|---|---|---|
| Density | 8.14 g/cm³ | At 20°C |
| Melting Range | 1370°C – 1400°C | Solidus / Liquidus |
| Tensile Strength () | ≥ 585 MPa | Annealed condition |
| Yield Strength () | ≥ 240 MPa | 0.2% non-proportional offset |
| Elongation () | ≥ 35% | High uniform deep-drawing ductility |
| Hardness | ≤ 90 HRB (140 – 180 HV) | Optimized for plate stamping |
| Thickness Range | 0.10 mm – 3.00 mm | Customizable precision strip |
| Thickness Tolerance | Up to ±0.005 mm | Precision cold rolling grade |
| Width Range | 10 mm – 650 mm | Slit coils / Cut-to-length sheets |
| Surface Condition | Bright Annealed (BA), 2B, Pickled | Ultra-smooth () |
Target Industrial Applications for Incoloy 825 Strip
1. Plate Heat Exchangers (PHE) & Condensers
Precision stamped into corrugated thermal plates, gasketed heat exchanger elements, and welded plate packs for high-temperature, corrosive fluid heat recovery in chemical plants and oil refineries.
2. Sulfuric & Phosphoric Acid Processing Units
Used in evaporator tubes, acid cooling plates, reboilers, and reactor heat exchange jackets exposed to concentrated sulfuric acid solutions and fertilizer manufacturing slurries.
3. Offshore Oil, Gas & Marine Cooling Systems
Installed in seawater-cooled compact heat exchangers, ballast water treatment heating units, and offshore platform exhaust gas heat recovery systems where chloride pitting resistance is essential.
4. Flue Gas Desulfurization (FGD) & Scrubber Systems
Fabricated into ducting liners, mist eliminator plates, and heat recovery reheaters handling moist sulfur dioxide, chlorides, and condensed acidic vapor.
5. Nuclear Fuel Reprocessing & Chemical Synthesis
Applied in dissolvers, heating coils, and radioactive waste evaporators requiring absolute metallurgical stability and stabilized grain boundary corrosion resistance.
Why Source Incoloy 825 Cold Rolled Strip from DLX Alloy
1. 1,200 Tons Monthly High-Precision Capacity
As a specialized high-performance alloy manufacturer, DLX Alloy operates advanced production lines capable of delivering over 1,200 tons per month of nickel alloy wire, strip, sheet, and bar products, ensuring fast lead times for large-scale industrial projects.
2. Closed-Loop Metallurgical Quality Control
Every batch undergoes 100% full-process traceability from VIM+ESR melting, hot rolling, multi-pass precision cold rolling, continuous atmosphere-controlled annealing, to automated optical surface defect inspection and eddy-current non-destructive testing.
3. Custom Slitting & High Deep-Drawing Tooling Support
We provide customized coil widths, specific coil inner diameters (ID 300mm/400mm/508mm), paper interleaving, and protective PE film application to protect strip surfaces during automated high-speed stamping operations.
4. Comprehensive B2B Export Support
With extensive experience in global B2B supply chains, DLX Alloy provides robust moisture-proof export packaging (fumigated wooden crates and steel strapping), full chemical/mechanical test reports, and dedicated technical consulting for global OEMs and engineering contractors.
Frequently Asked Questions
Q1: Why choose Incoloy 825 over stainless steel for heat exchanger plates?
A1: With 38–46% nickel plus Mo, Cu, and Ti, Incoloy 825 resists chloride stress corrosion cracking, pitting, and sulfuric acid far better than 304 or 316L.
Q2: How does DLX Alloy prevent cracking during plate corrugation stamping?
A2: We control cold rolling reduction and bright annealing to ensure an ultra-fine grain structure and high uniform elongation (≥35%) for crack-free deep drawing.
Q3: What thickness tolerances and slit widths are available?
A3: Thickness ranges from 0.1mm to 3.0mm with tight tolerances up to ±0.005mm; custom slit widths range from 10mm to 650mm with deburred edges.
Q4: What are the MOQ and export packaging standards?
A4: MOQ is dynamically tailored to gauge and width specifications. Coils are vacuum-sealed with desiccant, edge-protected, and packed in reinforced wooden crates.
Q5: Are full material test reports provided with each batch?
A5: Yes. Every shipment includes certified test reports covering exact OES chemical composition, tensile strength, elongation, hardness, and dimensions.
