2.4858

N08825

Incoloy 825

Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing.

Mechanical Properties

Tensile strength:	585	N/mm²
Yield strength 0,2% :	240	≥ N/mm²
Elongation:	30	≥ %
Hardness HB30:	135-165	≤ HB

Chemical Composition

NICKEL

Ni

38-46% min

CARBON

C

0,05% max

SILICON

Si

0,5% max

MAGNESE

Mn

1,0% max

SULPHUR

S

0,03% max

COPPER

Cu

1,5-3% max

Molybden

Mo

2,5-3,5% max

CHROMIUM

Cr

19,5-23,5% max

920-980°C followed by water quenching

The nickel content of Alloy 825 makes it resistant to chloride stress-corrosion cracking, and combined with molybdenum and copper, provides substantially improved corrosion resistance in reducing environments when compared to conventional austenitic stainless steels. The chromium and molybdenum content of Alloy 825 provides resistance to chloride pitting, as well as resistance to a variety of oxidizing atmospheres. The addition of titanium stabilizes the alloy against sensitization in the as-welded condition. This stabilization makes Alloy 825 resistant to intergranular attack after exposure in the temperature range which would
typically sensitize un-stabilized stainless steels. Alloy 825 is resistant to corrosion in a wide variety of process environments including sulfuric, sulfurous, phosphoric, nitric, hydrofluoric and organic acids and alkalis such as sodium or potassium hydroxide, and acidic chloride solutions.

OTHER Nickel Alloys

Tensile strength:	675	N/mm²
Yield strength 0,2% :	270	≥ N/mm²
Elongation:	30	≥ %
Hardness HB30:	–	≤ HB

2.4858 – N08825 – Incoloy 825