Sanicro® 276 Tube and pipe, seamless

Datasheet updated

2022-05-10 07:46
(supersedes all previous editions)

Sanicro® 276 (UNS N10276) is a nickel-chromium-molybdenum alloy suitable for service in a broad range of severe environments and is characterized by:

  • Superior corrosion resistance in H2S, CO2 and chloride containing environments
  • Excellent resistance to pitting corrosion owing to its high PRE* value of 68
  • Excellent corrosion resistance in hydrochloric acid

*PRE = %Cr + 3.3 x %Mo + 16 x %N

Standards

  • UNS: N10276
  • W.Nr.: 2.4819

Product standard

  • ASTM B622

Chemical composition (nominal)

Chemical composition (nominal) %
C Si Mn P S Cr Ni Mo W Fe Co V
≤0.010 ≤0.08 ≤1.0 ≤0.030 ≤0.015 16 57 16 3.5 4.5 <2.5 ≤0.35

Applications

The grade is suitable for use in a number of severe industrial environments, such as mixed acid chemical processing, pulp and paper production, industrial and municipal waste treatment and oil and gas.

Corrosion resistance

Sanicro® 276 has excellent corrosion resistance in a wide range of severe environments. It is resistant to general corrosion, localized pitting corrosion and environmental cracking in a wide range of aggressive media.

Pitting and crevice corrosion

The relative resistance of alloys to pitting corrosion can be estimated based on the chemical composition using the Pitting Resistance Equivalent number (PRE). Alloys with higher PRE values generally have better corrosion resistance compared to alloys with lower PRE values.

There are several different equations available for calculating the PRE from the chemical composition. In this document the equation specified in NACE MR0175 is used: *PRE = %Cr + 3.3 (%Mo + 0.5W) +16%N

Pitting resistance equivalent numbers (PRE)

Alloy UNS PRE*
Sanicro® 276 N10276 68
Sanicro® 28 N08028 38

Stress corrosion cracking

The high levels of nickel, molybdenum and chromium in Sanicro® 276 make the alloy highly resistant to sour environments containing high levels of H2S, CO2 and chlorides. The NACE standard MR 0175 is widely used for selecting material for use in H2S-containing environments in the oil and gas industry. According to NACE MR0175 Sanicro® 276 (UNS N10276) can be used in up to 1000 psi partial pressure H2S at 232°C (450°F) with no limitation on the chloride concentration. Below 204°C (400°F) there is no limit on the H2S level or chloride concentration.

Forms of supply

Sanicro® 276 seamless nickel-chromium-molybdenum alloy is supplied bright annealed in the outside diameter range 6 - 42 mm (0.25" - 1.625") and wall-thickness 0.89 - 5.0 mm (0.035" - 0.197").

Tubing is supplied in:

  • Hard condition
  • Annealed condition

Tolerances

Sanicro® 276, OD 6-42 mm EN 10305-1
OD, mm OD, mm Wall thickness %
6-30 +/-0.08 +/-10
32-40 +/-0.15 +/-10
42 +/-0.20 +/-10

Mechanical properties

At 20oC, metric units

Proof strengthTensile strengthElongation
Rp0.21)RmA2"
MPaMPa%
≥283 ≥690 ≥40

At 68oF, imperial units

Proof strengthTensile strengthElongation
Rp0.21)RmA2"
ksiksi%
≥41 ≥100 ≥40


1) Corresponds to 0.2% offset yield strength

Physical properties

Density: 8.89 g/m(0.321 lb/in3)

Thermal conductivity

Temperature, °CW/(m °C)Temperature, °FBtu/(ft h°F)
-1687.2-270 4.2
-738.7-99 5
20 9.8 68 5.7
100 11.2 200 6.5
200 12.8 400 7.4
300 14.7 600 8.5
400 16.4 800 9.5
500 18.2 1000 10.5
600 20.0 1200 11.6
700 21.9 1400 12.7
800 23.7 1600 13.7
900 25.4 1800 14.7

Specific heat capacity

Temperature, °CJ/(kg °C)Temperature, °FBtu/(lb °F)
20 427 68 0.10

Thermal expansion, mean values in temperature ranges (x10-6)

Temperature, °CPer °CTemperature, °FPer °F
25-100 12.2 77-200 6.8
25-200 12.4 77-400 7
25-300 12.9 77-600 7.2
25-400 13.2 77-800 7.4
25-500 13.5 77-1000 7.5
25-600 13.6 77-1200 7.7
25-700 14.1 77-1400 8.1
25-800 14.8 77-1600 8.5

Resistivity

Temperature, °CµΩmTemperature, °FµΩin.
20 1.30 68 51.2
100 1.32 200 52.0
200 1.34 400 52.8
300 1.35 600 53.2
400 1.36 800 53.5
500 1.37 1000 54.3
600 1.38  1200 54.3 
700 1.38 1400  53.9 
800 1.38 1600  54.7
900 1.38 1800  53.1 

Modulus of elasticity (x103) (annealed condition)

Temperature, °CMPaTemperature, °Fksi
 25  205 77  29.7
 100  203  200  29.4
 200  198  400  28.7
 300  192  600  27.8
 400  186  800  27
 500  180  1000  26.1
 600  178  1200  25.8
 700  167  1400  24.2
 800  159  1600  23

Welding

The weldability of Sanicro® 276 is good. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice.

For Sanicro® 276, heat-input of <1.2 kJ/mm and interpass temperature of <100°C (210°F) are recommended. A string bead welding technique should be used.

Recommended filler metals

TIG/GTAW or MIG/GMAW welding

ISO 18274 S Ni 6276/AWS A5.14 ERNiCrMo-4 (e.g. Exaton Ni56)

MMA/SMAW welding

ISO 14172 E Ni 6276/AWS A5.11 ENiCrMo-4

Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.