Incoloy 825 Alloy Plate Sulfuric Acid Resistant Sheets for Chemical Processing & FGD Systems

What is the Incoloy 825 ?

Incoloy 825 is a nickel-iron-chromium alloy plate engineered for extreme corrosion resistance, particularly in sulfuric acid, phosphoric acid, and other aggressive chemical environments. With its exceptional durability, heat resistance, and fabricability, Incoloy 825 plates are widely used in chemical processing plants, flue gas desulfurization (FGD) systems, and offshore oil & gas applications.

This alloy is an ideal alternative to stainless steel (e.g., 316L) where higher corrosion resistance and strength are required, making it a preferred material for critical industrial components.

Key Properties of Incoloy 825 Alloy Plate

• Superior Corrosion Resistance

• Excellent resistance to sulfuric acid (H₂SO₄), phosphoric acid (H₃PO₄), and chloride solutions

• Performs well in both oxidizing and reducing environments

• Resists pitting, crevice corrosion, and stress corrosion cracking (SCC)

• High-Temperature Stability

• Maintains strength and corrosion resistance up to 540°C (1000°F)

• Good oxidation resistance in continuous high-heat applications

• Mechanical Strength & Fabricability

• Tensile Strength: ≥586 MPa (85 ksi)

• Yield Strength: ≥241 MPa (35 ksi)

• Elongation: ≥30% (excellent formability)

• Weldability: Can be welded using TIG, MIG, and SMAW methods

• Cost-Effective Alternative to Nickel Alloys

• More affordable than Hastelloy & Inconel while offering similar corrosion resistance in many applications

Typical Composition (wt%):

• Nickel (Ni): 38-46% (base)

• Chromium (Cr): 19.5-23.5% (corrosion resistance)

• Iron (Fe): ≥22%

• Molybdenum (Mo): 2.5-3.5% (enhances chloride resistance)

• Copper (Cu): 1.5-3.0% (improves sulfuric acid resistance)

• Titanium (Ti): 0.6-1.2% (stabilizes against sensitization)

Primary Applications of Incoloy 825 Plates

1. Chemical Processing Industry Incoloy 825 is widely used in:

2. Why Choose Incoloy 825?

• Outperforms stainless steel 316L in hot sulfuric acid environments

• Resists halogen and acidic corrosion better than most Fe-Ni alloys

• Sulfuric acid production plants (pickling tanks, heat exchangers)

• Phosphoric acid evaporators & reactors

• Chlor-alkali processing equipment (electrolysis cells, piping)

3. Flue Gas Desulfurization (FGD) Systems

   Performance Benefits:

• Withstands chlorides, fluorides, and sulfur compounds

• Long service life in wet FGD environments

• Scrubber linings & absorber towers (resists acidic slurry corrosion)

• Ductwork & dampers in coal-fired power plants

• Chimney & stack components

4. Oil & Gas (Sour Service Applications)

5. Key Advantage:

• Complies with NACE MR0175/ISO 15156 for sour service

• Downhole tubing & casing in H₂S-containing wells

• Offshore platform components exposed to seawater

• Heat exchangers in refineries

6. Marine & Pollution Control Equipment

• Seawater cooling systems

• Wastewater treatment evaporators

• Desalination plant components

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Why Customers Choose Incoloy 825 Plates?

• Unmatched Sulfuric Acid Resistance

• Proven performance in up to 40% H₂SO₄ at elevated temperatures

• Cost Savings vs. High-Nickel Alloys

• 30-50% lower cost than Hastelloy C-276 for many applications

• Reliable in Harsh Environments

• Trusted in chemical plants, FGD scrubbers, and offshore platforms

• Easy Fabrication & Welding

• Can be formed, machined, and welded with standard methods

• Global Availability & Certifications

• Meets ASTM B424, ASME SB424, EN 10095 standards

Available Forms & Specifications

• Standard Sizes:

• Thickness: 5mm to 150mm

• Width: 1000mm to 3000mm

• Length: 2000mm to 12000mm

• Surface Finishes:

• Hot-rolled, annealed & pickled

• Cold-rolled, polished (for special applications)

• Certifications:

• PED 2014/68/EU (Pressure Equipment Directive)

• NACE MR0175 (Sour Service)

• Mill Test Reports (MTC) per EN 10204 3.1

CHANGZHOU DLX ALLOY CO, LTD was established in 2002 and has got ISO9001 International Quality Management System Certificate and SGS Certificate. Our factory is professional in researching and producing special alloy material. From melting, drawing, heat treatment, finishing and testing .We offer nickel based, copper-based, and iron-based alloys, including super alloy, welding materials, anti-corrosion alloy, Precision Alloy , FeCrAl alloy, NiCr alloy, CuNi alloy, thermocouple and etc, in the form of wire, strip, ribbon, bar, tube, plate.

Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications. We also provide chemical analysis reports for every FeCrAl alloy, NiCr alloy, and other products purchased.

For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.

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