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825: Solid Solution Nickel Alloy

Common Names:

Inconel 825, Inc825, Alloy 825

Alloy Group

Solid Solution Nickel Alloy

Corrosion Resistance

High

Yield Strength

110

—

160

Wall Tolerance

0.875

Density

0.294

PREN

29.4

—

36.7

Additional Documentation

Alloy Details

Alloy 825 (UNS N08825), also known as 2242, is a cold-hardened nickel-based alloy designed for corrosion resistance in highly sour (H2S) environments with moderate chloride levels, offering high strength up to 350°F.

Alloy 825 provides superior resistance to H2S compared to stainless steels, making it suitable for applications such as downhole tubular components, packers, and other subsurface equipment in sour wells under high-pressure, high-temperature (HPHT) conditions, as well as in Acid Gas Injection (AGI) wells. However, it is important to consider all environmental factors, including H2S, CO2, temperature, pH, and chloride concentration, before finalizing material selection.

This alloy is classified as a type 4c alloy in MR0175/ISO15156, with no restrictions for H2S partial pressure below 270°F and resistance to 200 psi H2S at 350°F.

Solid Solution Nickel Alloy

Nickel-base alloys are primarily employed in environments where the partial pressure of H2S exceeds 3 psi. These alloys are enhanced with increased levels of Nickel, Molybdenum, and other elements to extend their performance in harsh conditions involving high temperatures, H2S, and chlorides. Nickel alloys are approved for highly sour environments in accordance with NACE MR0175/ISO 15156. In the annealed condition yield strengths may range from 30 to 55 ksi. Pipe is typically supplied in the cold-hardened condition with yield strength between 110 and 160 ksi.

Chemical Composition

C
6
Carbon
0.05%
Si
14
Silicon
0.5%
P
15
Phosphorus
0.03%
S
16
Sulfur
0.03%
Ti
22
Titanium
0.6%‒1.2%
Cr
24
Chromium
19.5%‒23.5%
Mn
25
Manganese
1%
Fe
26
Iron
20.99%‒37.9%
Ni
28
Nickel
38%‒46%
Cu
29
Copper
1.5%‒3%
Mo
42
Molybdenum
2.5%‒3.5%

Specified Mechanical Properties

API 5CRA / ISO 13680 Group 4 Category 21-42-3
GradeYield
Strength
ksi		Tensile
Strength
ksi		Elongation
%		Hardness
HRC		NACE MR0175/ISO 15156
H2S Sour Service Limits
minmaxminminmax
1101101401151133Table A.14
Type 4c		No limit ≤ 270°F,
Refer to table for temperatures up to 450°F
1251251501301035
140140160145938140 Grade not recommended for sour service

* Non-standard mechanical properties and grades are made available upon agreement.

Specified Mechanical Properties in Annealed Condition

Per ASTM B163 / ASTM B423
Tensile StrengthYield StrengthElongationHardness
minimum, ksiminimum, ksiminimum, %HRB
85353090

Higher strength properties can be provided in the cold hardened condition.

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