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Nickel Alloy-Incoloy 825, UNS N08825 Introduction

Nickel Alloy-Incoloy 825, UNS N08825 Introduction

Time:2022-03-20 Source:WUXI JIANUO SPECIAL STEEL CO.

Steel Grade: Incoloy 825 N08825 / 2.4858 / 0Cr21Ni42Mo3Cu2Ti / NS142

Features and Applications:


* The alloy contains about 30% Fe and is included in the super austenitic stainless series with a face-centered cubic lattice metallographic structure.

* Used for various applications containing sulfur and phosphorus, it has a high resistance to hydrochloric acid corrosion, especially in non-flowing and non-ventilated solutions susceptible to chloride porosity and gap corrosion.


* Lower corrosion resistance to strong alkalis and halogens than alloys with higher nickel content.

* Good resistance to pitting corrosion, crevice corrosion and stress corrosion cracking.

*. Very good oxidation resistance and non-oxidizing thermal acidity.

* Good mechanical properties at room temperature and high temperatures up to 550°C.

* Certified to manufacture pressure vessels at temperatures up to 450°C.


* For heat exchangers and condensers

* Components for applications in sulfuric acid environments and acid gases containing many ions.

* Pipelines for oil and steam transmission, coolers for oil and steam.

* Nuclear waste disposal devices.

Applicable standards:

ASTM B 163/ B 423/ B 751/ B 775/ B 829/ ASME SB163/ SB 423/ SB 751/ SB 775/ SB 829

Chemical composition:

C Si S Mn Fe Mo Ni Cr Cu Ti Al
0.05 max 0.5 max 0.03 max 1.0 max 22.0 min 2.5 – 3.5 38.0 – 46.0 19.5 – 23.5 1.5 –


0.6 – 1.2 0.2 max

Density and coefficient of linear expansion:

Density 8.14 g/cm3
Temperature 21~93°C
coefficient of linear expansion 14.0 µm/m•°C

Mechanical properties:



Tensile Strength


Yield strength (0.2% residual deformation)

.Ksi (Mpa)min

Elongation at 2in or 50 scale


Annealing 85(586) 35(241) 30