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G3: Solid Solution Nickel Alloy

Common Names:

Inconel G3, W. Nr. 2.4619

Alloy Group

Solid Solution Nickel Alloy

Corrosion Resistance

Severe

Yield Strength

110

—

160

Wall Tolerance

0.875

Density

0.294

PREN

42.45

—

56.5

Additional Documentation

Alloy Details

Alloy G3 (UNS N06985) is a cold-hardened nickel-based alloy designed for corrosion resistance in highly sour (H2S) environments with high chloride levels, offering high strength up to 400°F.

With its elevated nickel and molybdenum content, G3 extends the sour service capabilities of nickel alloys, while also delivering exceptional resistance to chlorides and dissolved oxygen. As a result, it is frequently used in downhole tubular components, packers, and other subsurface equipment for severely sour wells operating under high-pressure, high-temperature (HPHT) conditions, saltwater injection wells, and Acid Gas Injection (AGI) wells. However, it is essential to evaluate all environmental factors, including H2S, CO2, temperature, pH, and chloride concentration, before finalizing material selection.

For sour service conditions, G3 is classified as a type 4d alloy in MR0175/ISO15156, with no restrictions on H2S partial pressure below 300°F and capable of withstanding 300 psi H2S at 425°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
0.015%
Si
14
Silicon
1%
P
15
Phosphorus
0.04%
S
16
Sulfur
0.03%
Cr
24
Chromium
21%‒23.5%
Mn
25
Manganese
1%
Fe
26
Iron
18%‒21%
Co
27
Cobalt
5%
Ni
28
Nickel
35.915%‒53.5%
Cu
29
Copper
1.5%‒2.5%
Nb
41
Niobium
0.5%
Mo
42
Molybdenum
6%‒8%
W
74
Tungsten
1.5%

Specified Mechanical Properties

API 5CRA / ISO 13680 Group 4 Category 22-50-7
GradeYield
Strength
ksi		Tensile
Strength
ksi		Elongation
%		Hardness
HRC		NACE MR0175/ISO 15156
H2S Sour Service Limits
minmaxminminmax
1101101401151135Table A.14
Type 4c		No limit ≤ 300°F,
Refer to table for temperatures up to 450°F
1251251501301037
140140160145938140 Grade not recommended for sour service

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

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