Incoloy® 825 is a high-performance nickel-iron-chromium alloy engineered to provide exceptional resistance to a wide range of corrosive environments, including those containing sulfuric, phosphoric, and nitric acids. Its robust composition—enhanced with molybdenum, copper, and titanium—makes it highly effective in resisting pitting, crevice corrosion, and intergranular attack. This alloy is a go-to material across multiple demanding industries such as chemical processing, pollution control, oil and gas, nuclear fuel reprocessing, and marine engineering. Whether it’s used in heat exchangers, piping systems, tanks, or scrubber units, Incoloy® 825 offers long-term durability and reliability in harsh operational conditions. Its stability under elevated temperatures and pressure also makes it suitable for heat-intensive and high-stress applications. Engineers and procurement teams rely on this alloy not only for its mechanical strength and corrosion resistance but also for its cost-efficiency in lifecycle performance.
At Nickel Systems Inc., we provide top-quality Incoloy® 825 fasteners—to meet the exacting needs of your project. Our expert team is ready to assist with material selection, technical support, and fast delivery. Contact Nickel Systems Inc. today to get a customized quote and experience the industry’s most trusted supply of corrosion-resistant alloys.
Check out our technical data and specifications for Incoloy 825 below. If you questions are not answered, download Incoloy® 825’s technical data sheet here.
Incoloy® 825 Specifications | ||||||
Product | BSI | ASTM | ASME | DIN | VdTÜV | ISO |
Rod, Bar, Wire, & Forging Stock | 3076NA16 | B425, B564 | SB425, SB564 | 17752, 17753, 17754 | 432 | 9723, 9724, 9725 |
Plate, Sheet, & Strip | 3072NA16, 3073NA16 | B424, B906 | SB424, SB906 | 17750 | 432 | 6208 |
Pipe & Tube | 3074NA16 | B163, B423, B704, B705, B751, B775, B829 | SB163, SB423, SB704, SB705, SB705, SB751, SB775, SB829 | 17751 | 432 | 6207 |
Others | B366 | SB366 | 17744 | |||
Incoloy 825 Chemical Composition | |
Element | % Composition |
Nickel (Ni) | 38.0-46.0 |
Iron (Fe) | 22.0 Minium |
Chromium (Cr) | 19.5-23.5 |
Molybdenum (Mo) | 2.5-3.5 |
Copper (Cu) | 1.5-3.0 |
Titanium (Te) | 0.6-1.2 |
Carbon (C) | 0.05 Max |
Manganese (Mn) | 1.0 Max |
Sulfur (S) | 0.03 Max |
Silicon (Si) | 0.5 Max |
Aluminum (Al) | 0.2 Max |
Incoloy® 825 Physical Properties | ||
Property | Value | Units |
Density | 0.294 | lb/in³ |
8.14 | Mg/m³ | |
Melting Range | 2500-2550 | ℉ |
1370-1400 | ℃ | |
Specific Heat | 0.105 | Btu/lb●℉ |
440 | J/kg●℃ | |
Curie Temperature | <-320 | ℉ |
<-196 | ℃ | |
Permeability at 200 oersted (15.9 kA/m) | 1.005 | |
Incoloy® 825 Mechanical Properties | |||
Form & Condition | Tensile Strength | 0.2% Yield Strength | % Elongation |
Tubing, Annealed | 112 ksi | 64 ksi | 36 |
772 MPa | 441 MPa | ||
Tubing, Cold Drawn | 145 ksi | 129 ksi | 15 |
1,000 MPa | 889 MPa | ||
Bar, Annealed | 100 ksi | 47 ksi | 45 |
690 MPa | 324 MPa | ||
Plate, Annealed | 96 ksi | 49 ksi | 45 |
662 MPa | 338 MPa | ||
Sheet, Annealed | 110 ksi | 61 ksi | 39 |
758 MPa | 421 MPa | ||
Incoloy® 825 Thermal Properties | |||
Temperature | Coefficient of Expansion | Thermal Conductivity | Electrical Resistivity |
℉ | 10^(-6)in/in●℉ | Btu-in/ft²●h●℉ | ohm●circ mil/ft |
-250 | - | 55 | - |
-200 | - | 59 | - |
-100 | - | 66 | - |
0 | - | 72.6 | - |
78 | - | 76.8 | 678 |
100 | - | 78.4 | 680 |
200 | 7.8 | 85.0 | 687 |
400 | 8.3 | 97.5 | 710 |
600 | 8.5 | 109.6 | 728 |
800 | 8.7 | 119.7 | 751 |
1,000 | 8.8 | 130.9 | 761 |
1,200 | 9.1 | 141.8 | 762 |
1,400 | 9.5 | 154.9 | 765 |
1,600 | 9.7 | 171.8 | 775 |
1,800 | - | 192.0 | 782 |
2,000 | - | - | 793 |
℃ | µm/m●℃ | W/m●℃ | µΩ●m |
-150 | - | 7.9 | - |
-100 | - | 8.9 | - |
0 | - | 10.7 | - |
25 | - | 11.1 | 1.13 |
100 | 14.1 | 12.3 | 1.14 |
200 | 14.8 | 13.8 | 1.18 |
300 | 15.3 | 15.4 | 1.21 |
400 | 15.6 | 16.9 | 1.24 |
500 | 15.8 | 18.2 | 1.26 |
600 | 16.0 | 19.6 | 1.24 |
700 | 16.7 | 21.2 | 1.27 |
800 | 17.3 | 23.1 | 1.28 |
900 | - | 25.5 | 1.29 |
1,000 | - | - | 1.30 |
This table contains the Modulus of Elasticity for Hot rolled and Annealed Incoloy® 825 plate in English and Metric units.
Incoloy® 825 Modulus of Elasticity | |||
Temperature | Young's Modulus | Shear Modulus | Poisson's Ratio |
℉ | 10³ ksi | 10³ ksi | |
100 | 28.3 | 11.0 | 0.29 |
200 | 27.9 | 10.9 | 0.28 |
300 | 27.5 | 10.7 | 0.29 |
400 | 27.1 | 10.4 | 0.30 |
500 | 26.6 | 10.2 | 0.30 |
600 | 26.1 | 10.1 | 0.29 |
700 | 25.5 | 10.0 | 0.28 |
800 | 25.0 | 9.8 | 0.28 |
900 | 24.5 | 9.5 | 0.29 |
1,000 | 24.0 | 9.2 | 0.30 |
1,100 | 23.6 | 8.9 | 0.33 |
1,200 | 23.0 | 8.6 | 0.34 |
1,300 | 22.3 | 8.2 | 0.35 |
1,400 | 21.3 | 7.9 | 0.35 |
1,500 | 20.3 | 7.6 | 0.34 |
1,600 | 19.5 | 7.3 | 0.34 |
1,700 | 18.5 | 6.9 | 0.34 |
1,800 | 17.5 | 6.5 | 0.34 |
Temperature | Young's Modulus | Shear Modulus | Poison's Ratio |
℃ | GPa | GPa | |
20 | 196 | 76 | 0.29 |
20 | 196 | 76 | 0.29 |
100 | 192 | 75 | 0.28 |
200 | 187 | 72 | 0.30 |
300 | 181 | 70 | 0.29 |
400 | 174 | 68 | 0.28 |
500 | 168 | 65 | 0.29 |
600 | 162 | 61 | 0.33 |
700 | 154 | 57 | 0.35 |
800 | 142 | 53 | 0.34 |
900 | 131 | 49 | 034 |
1000 | 118 | 44 | 0.34 |
Incoloy® 825 Charpy Keyhole Impact Strength of Plate | ||||
Temperature | Orientation | Impact Strength | ||
℉ | ℃ | ft●lb | J | |
Room | Room | Longitudinal | 79.0 | 107 |
Transverse | 83.0 | 113 | ||
-110 | -43 | Longitudinal | 78.0 | 106 |
Transverse | 78.5 | 106 | ||
-320 | -196 | Longitudinal | 67.0 | 91 |
Transverse | 71.5 | 97 | ||
-423 | -253 | Longitudinal | 68.0 | 92 |
Transverse | 68.0 | 92 | ||
Here is a High-temperature Tensile Properties Table for Incoloy® 825 Annealed Bar. This is for typical usage.
Incoloy® 825 is a nickel-iron-chromium alloy with increased amounts of molybdenum, copper, and titanium. It is designed primarily for excellent corrosion resistance in harsh environments.
Check out our chemical composition break down of Incoloy® 825 and find out how each element affects its corrosion resistance.
Incoloy® 825 has excellent sulfuric, phosphoric, nitric, and organic acids. This is due to the presence of Copper. Nickel and molybdenum boost resistance to reducing acids and chloride-containing media.
The combination of high nickel and chromium makes it highly resistant to both oxidizing and reducing agents, unlike some stainless steels that are good only in one or the other.
Molybdenum and chromium protect against localized attack, even in marine or brine environments. The PREN for Incoloy® 825 is ~ 31. Get more information on our blog discussing Pitting & PREN.
Nickel content is critical for resistance to chloride-induced SCC, making it superior to stainless steels in harsh environments.
Incoloy® 825’s Titanium inclusion ensures resistance by stabilizing the structure against sensitization during welding or heating in the critical range (600-800℃).
Incoloy® 825 stands out as a highly versatile corrosion-resistant alloy, engineered to perform reliably in some of the most demanding chemical and marine environments. Its unique blend of nickel, iron, chromium, molybdenum, copper, and titanium provides outstanding protection against a wide array of corrosive agents, including strong acids, chlorides, and oxidizing or reducing media. Whether you’re designing equipment for chemical processing, pollution control, or marine applications, Incoloy® 825 offers a proven solution that balances performance, durability, and cost-effectiveness.
Ready to learn more or start your project? Contact us today to request a quotation and speak with a materials specialist who can help determine if Incoloy® 825 is the right fit for your application.
