G-3

Also Known As

• ICONEL® Alloy G3
• Hastelloy® Alloy G-3
• W.Nr. 2.4619

Suitable Applications

Corrosive environments containing high chlorides, H2S, and high temperature

As tubing, liner, and casing in high-temperature sour gas and oil wells

Product Availability

FORMS:
Seamless Pipe, Tubing

OD:
MIN OD: 2-7/8”
MAX OD: 10-3/4”
Standard & Non-Standard Sizes Available

RANGE:
R1, R2, R3, Lengths up to 70'

G-3

UNS N06985 | Datasheet

G-3 Applicable EnvironmentsAlloy G-3 (UNS N06985) is a cold hardened nickel-based alloy, intended for corrosion resistance to highly sour (H2S) environments with high chloride content, requiring high strength up to 400°F.

The high nickel and molybdenum content of G-3vbextends the sour service limits of nickel alloys while also providing excellent resistance to chlorides and dissolved oxygen. It is therefore used for downhole tubular components, packers, and other subsurface equipment in severely sour wells with high-pressure and high-temperature (HPHT) conditions, saltwater Injection wells, and Acid Gas Injection (AGI) wells. However, all environmental factors, including H2S, CO2 , temperature, pH, and chloride concentration, should be considered before final material selection.

For sour service applications, it is classified in MR0175/ISO15156 as a type 4d alloy, with no restrictions to a partial pressure of H2S below 300°F and resistant to 300 psi H2S at 425°F.

Chemical Composition

CCrNiFeMnSiMoCoCuPSNb+TaW
≤ 0.01521 - 23.5BAL18 - 21≤ 1≤ 16 - 8≤ 51.5 - 2.5≤ 0.04≤ 0.03Nb+Ta ≤ 0.5≤ 1.5
(mass %)

Manufacturing Process

PROCESSDESCRIPTION
Steel MakingMade by electric furnace process or blast furnace followed by Vacuum Oxygen Decarburization (VOD) process or Argon Oxygen Decarburization (AOD) Process
Pipe MakingManufactured by traditional tube manufacturing processes, High strength tubulars should be furnished in cold worked condition
Heat TreatmentSolution Annealing Process before final cold drawing

Specified Mechanical Properties

API 5CRA / ISO 13680 Group 3 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.

Typical Physical Properties

  70°F200°F400°F
Densitylbs/in30.29
Thermal ExpansionX10-6/°F8.18.18.1
Elastic Moduluspsi x 10628.9
Poisson Ratio0.3
Thermal ConductivityBtu/ft h °F5.86.88
Specific HeatBtu/lb °F0.110.110.11

    Get Your Project Started, Speak to the CRA Team.