C276 OCTG

C276

UNS N10276 / W.Nr 2.4819

COMMON TRADE NAMES: SMC276®, INCONEL® Alloy C-276, Hastelloy® C-276

C276 Applicable EnvironmentsC276 (UNS N10276) is a cold hardened nickel-based alloy intended for the most extreme well conditions up to 450°F.

In addition to its exceptional corrosion resistance under the most severe conditions, higher strengths may be achieved with C276 than other nickel alloys. Therefore, the alloy is commonly used for downhole tubular components, packers, and other subsurface equipment under the most extreme environmental conditions found in high-pressure, high-temperature (HPHT) wells, 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.

The alloy is classified in MR0175/ISO15156 as a type 4e alloy, with no restrictions to a partial pressure of H2S below 400°F and resistant to 1000 psi H2S at 450°F.

Applications in Upstream Oil & Gas

  • Severely corrosive environments containing CO2 , H2S, S0 (elemental sulfur), and chlorides
  • 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

CCrNiFeMnSiMoCoPSVW
≤ 0.0214.5 - 16.5BAL4 - 7≤ 1≤ 0.0815 - 17≤ 2.5≤ 0.03≤ 0.03≤ 0.353 - 4.5
(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 4 Category 15-60-16

GradeYield
Strength
ksi
Tensile
Strength
ksi
Elongation
%
Hardness
HRC
NACE MR0175/ISO 15156
H2S Sour Service Limits
minmaxminminmax
1101101401251135Table A.14No limit ≤ 400°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/in30.32
Thermal ExpansionX10-6/°F66.26.7
Elastic Moduluspsi x 10629.82928.3
Poisson Ratio0.3
Thermal ConductivityBtu/ft h °F5.96.47.5
Specific HeatBtu/lb °F0.10.10.1

Product Availability

MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
MAX WALL THICKNESS: 1.925”
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