Alloy G3

Alloy G3

UNS N06985 / W.Nr 2.4619

COMMON TRADE NAMES: ICONEL® Alloy G3, Hastelloy® Alloy G-3

G-3 Applicable EnvironmentsAlloy G3 (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 G3 extends 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.

Applications in Upstream Oil & Gas

  • Corrosive environments containing high chlorides, H2S, and high temperature
  • Tubing
  • Casing
  • Liners
  • Base Pipe for Sand Screens
  • Expandables
  • Perforating Guns
  • Landing Joints
  • Extensions
  • Shrouds
  • Maker Joints
  • Pipe for VIT
  • Swell Packers
  • Geothermal
  • Carbon Capture and Sequestration (CCS)

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Chemical Composition

≤ 0.01521 - 23.5BAL18 - 21≤ 1≤ 16 - 8≤ 51.5 - 2.5≤ 0.04≤ 0.03≤ 0.5≤ 1.5

Manufacturing Process

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 4 Category 22-50-7

NACE MR0175/ISO 15156
H2S Sour Service Limits
1101101401151135Table A.14
Type 4c
No limit ≤ 300°F,
Refer to table for temperatures up to 450°F
140140160145938140 Grade not recommended for sour service
*Non-standard mechanical properties and grades are made available upon agreement.

Typical Physical Properties

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

Product Availability

MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
LENGTHS: Up to 70′ (840”) – R1, R2, R3

END FINISH: Plain end, Premium threads, & API threads

Standard & Non-Standard Sizes Available.

Manufactured Material Available as Quickly as 1 Week.

Non-Standard Mill Quantities Accommodated