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Incoloy 20 Alloy Sheet (UNS N08020, also called Alloy 20) is a premium nickel-iron-chromium alloy engineered for extreme acid resistance. Unlike standard stainless steels, it incorporates 3.0-4.0% copper and 2.0-3.0% molybdenum to prevent intergranular corrosion and pitting— making it the top choice for sulfuric acid and phosphoric acid applications. With 32.0-38.0% nickel, 19.0-21.0% chromium, and iron as balance, Incoloy 20 Alloy Sheet balances corrosion resistance and mechanical strength for thin-gauge structural parts.
Our Incoloy 20 Alloy Sheet adheres to ASTM B472/B473 (nickel-iron-chromium alloy sheets) and meets global standards:
Thickness: 0.5 mm to 20 mm (thin sheets for precision; thick plates for pressure vessels)
Width: 1000 mm to 2000 mm (custom widths available)
Length: 2000 mm to 6000 mm (cut-to-size options)
Density: 8.08 g/cm³; Melting point: 1357-1430℃
Incoloy 20 (Alloy 20/UNS N08020) | ||||||||||||
Chemical Component | % | Ni | Cr | Fe | C | Mo | Mn | Si | S | Nb+Ta | p | Cu |
Min | 32 | 19 | Allowance | 0.07 | 2 | 3 | ||||||
Max | 38 | 21 | Allowance | 3 | 2 | 1 | 0.035 | 1 | 0.045 | 4 | ||
Physical Property | Density | 8.08g/Cm3 | ||||||||||
Melting Point | 1357-1430 ℃ | |||||||||||
The Minimum Mechanical Properties Of The Alloy At Room Temperature | Typical Mechanical Properties | Tensile Strength | Yield Strength | Elongation Rate | Brinell Hardness | |||||||
Solution Treatment | 620 | 300 | 40 | - | ||||||||
The defining strength of Incoloy 20 Alloy Sheet is its acid tolerance:
Resists 20-60% sulfuric acid at up to 60℃ (316L stainless steel fails above 30℃)
Performs in dilute-to-concentrated phosphoric acid (fertilizer production)
Tolerates acidic solutions with chloride impurities (avoids pitting)
Copper and molybdenum stabilize its passive film, ensuring long-term durability in harsh chemicals.
Incoloy 20 Alloy Sheet avoids “sensitization” (chromium carbide formation at grain boundaries), even after welding. This eliminates IGC— a common failure mode in unstabilized alloys like 304 stainless steel— making it ideal for welded structures (e.g., reactor tanks).
At room temperature, it delivers impressive performance for thin sheets:
Minimum tensile strength: 620 MPa
Minimum yield strength (0.2% offset): 300 MPa
Minimum elongation: 40% (supports bending, stamping, and deep drawing)
Solution treatment (1040-1100℃, water quenched) ensures a non-magnetic austenitic structure— perfect for electrical applications.
Incoloy 20 Alloy Sheet is easy to process with standard techniques:
Cutting: Shearing, laser-cutting, or plasma-cutting (no edge cracking)
Forming: Excellent cold formability for tank heads and curved parts
Welding: TIG/MIG compatible (uses ERNiFeCr-1 filler; no post-weld heat treatment needed for most uses)
Sulfuric acid concentrators, condensers, and storage tanks
Phosphoric acid fertilizer reactors
Acid scrubbers for waste treatment
API (active pharmaceutical ingredient) tanks (resists acidic APIs and cleaners)
Food-grade containers (citrus juices, tomato sauce)
Cleanroom equipment (meets 3-A Dairy hygiene standards)
Downhole tubulars (resist acidic well brines)
Refinery heat exchangers (handles sour crude byproducts)
Offshore platform piping (saltwater + acidic gases)
Wastewater treatment acid tanks
Flue gas desulfurization systems
Heavy metal recovery acid leaching tanks
We customize Incoloy 20 Alloy Sheet to your project:
Dimension customization: Cut-to-size (any length/width) and precision blanking for small parts
Surface finishes:
2B Finish (cold-rolled, bright): For food/pharmaceutical use
No. 4 Finish (brushed): Aesthetic + high hygiene
Pickled Finish: For welded structures (removes heat tint)
Certifications: ISO 9001:2015, MTRs (ASTM B473), third-party inspection (upon request)
Low MOQ: 100kg for small-batch maintenance or prototyping
It outperforms 304/316 stainless steel in dilute (≤10%) hydrochloric acid at room temperature but is not recommended for concentrated (≥20%) or high-temperature (≥50℃) solutions (upgrade to Hastelloy C276 for these cases).
Incoloy 20 Alloy Sheet operates continuously at up to 550℃. Beyond this, strength and oxidation resistance decline— choose Inconel 601 for higher temps.
Yes. It meets FDA 21 CFR Part 175.300 (non-toxic, no metal leaching) and its smooth finishes (2B/No. 4) are easy to sanitize— ideal for citrus juicers or dairy equipment.
Every batch undergoes ICP-MS chemical analysis (verifies UNS N08020 composition), tensile testing, 50% sulfuric acid immersion testing (100 hours, no corrosion), and surface defect checks (ASTM B472 standards).
Incoloy 20 Alloy Sheet (UNS N08020, also called Alloy 20) is a premium nickel-iron-chromium alloy engineered for extreme acid resistance. Unlike standard stainless steels, it incorporates 3.0-4.0% copper and 2.0-3.0% molybdenum to prevent intergranular corrosion and pitting— making it the top choice for sulfuric acid and phosphoric acid applications. With 32.0-38.0% nickel, 19.0-21.0% chromium, and iron as balance, Incoloy 20 Alloy Sheet balances corrosion resistance and mechanical strength for thin-gauge structural parts.
Our Incoloy 20 Alloy Sheet adheres to ASTM B472/B473 (nickel-iron-chromium alloy sheets) and meets global standards:
Thickness: 0.5 mm to 20 mm (thin sheets for precision; thick plates for pressure vessels)
Width: 1000 mm to 2000 mm (custom widths available)
Length: 2000 mm to 6000 mm (cut-to-size options)
Density: 8.08 g/cm³; Melting point: 1357-1430℃
Incoloy 20 (Alloy 20/UNS N08020) | ||||||||||||
Chemical Component | % | Ni | Cr | Fe | C | Mo | Mn | Si | S | Nb+Ta | p | Cu |
Min | 32 | 19 | Allowance | 0.07 | 2 | 3 | ||||||
Max | 38 | 21 | Allowance | 3 | 2 | 1 | 0.035 | 1 | 0.045 | 4 | ||
Physical Property | Density | 8.08g/Cm3 | ||||||||||
Melting Point | 1357-1430 ℃ | |||||||||||
The Minimum Mechanical Properties Of The Alloy At Room Temperature | Typical Mechanical Properties | Tensile Strength | Yield Strength | Elongation Rate | Brinell Hardness | |||||||
Solution Treatment | 620 | 300 | 40 | - | ||||||||
The defining strength of Incoloy 20 Alloy Sheet is its acid tolerance:
Resists 20-60% sulfuric acid at up to 60℃ (316L stainless steel fails above 30℃)
Performs in dilute-to-concentrated phosphoric acid (fertilizer production)
Tolerates acidic solutions with chloride impurities (avoids pitting)
Copper and molybdenum stabilize its passive film, ensuring long-term durability in harsh chemicals.
Incoloy 20 Alloy Sheet avoids “sensitization” (chromium carbide formation at grain boundaries), even after welding. This eliminates IGC— a common failure mode in unstabilized alloys like 304 stainless steel— making it ideal for welded structures (e.g., reactor tanks).
At room temperature, it delivers impressive performance for thin sheets:
Minimum tensile strength: 620 MPa
Minimum yield strength (0.2% offset): 300 MPa
Minimum elongation: 40% (supports bending, stamping, and deep drawing)
Solution treatment (1040-1100℃, water quenched) ensures a non-magnetic austenitic structure— perfect for electrical applications.
Incoloy 20 Alloy Sheet is easy to process with standard techniques:
Cutting: Shearing, laser-cutting, or plasma-cutting (no edge cracking)
Forming: Excellent cold formability for tank heads and curved parts
Welding: TIG/MIG compatible (uses ERNiFeCr-1 filler; no post-weld heat treatment needed for most uses)
Sulfuric acid concentrators, condensers, and storage tanks
Phosphoric acid fertilizer reactors
Acid scrubbers for waste treatment
API (active pharmaceutical ingredient) tanks (resists acidic APIs and cleaners)
Food-grade containers (citrus juices, tomato sauce)
Cleanroom equipment (meets 3-A Dairy hygiene standards)
Downhole tubulars (resist acidic well brines)
Refinery heat exchangers (handles sour crude byproducts)
Offshore platform piping (saltwater + acidic gases)
Wastewater treatment acid tanks
Flue gas desulfurization systems
Heavy metal recovery acid leaching tanks
We customize Incoloy 20 Alloy Sheet to your project:
Dimension customization: Cut-to-size (any length/width) and precision blanking for small parts
Surface finishes:
2B Finish (cold-rolled, bright): For food/pharmaceutical use
No. 4 Finish (brushed): Aesthetic + high hygiene
Pickled Finish: For welded structures (removes heat tint)
Certifications: ISO 9001:2015, MTRs (ASTM B473), third-party inspection (upon request)
Low MOQ: 100kg for small-batch maintenance or prototyping
It outperforms 304/316 stainless steel in dilute (≤10%) hydrochloric acid at room temperature but is not recommended for concentrated (≥20%) or high-temperature (≥50℃) solutions (upgrade to Hastelloy C276 for these cases).
Incoloy 20 Alloy Sheet operates continuously at up to 550℃. Beyond this, strength and oxidation resistance decline— choose Inconel 601 for higher temps.
Yes. It meets FDA 21 CFR Part 175.300 (non-toxic, no metal leaching) and its smooth finishes (2B/No. 4) are easy to sanitize— ideal for citrus juicers or dairy equipment.
Every batch undergoes ICP-MS chemical analysis (verifies UNS N08020 composition), tensile testing, 50% sulfuric acid immersion testing (100 hours, no corrosion), and surface defect checks (ASTM B472 standards).
