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)
| 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
| 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 strength | Tensile strength | Elongation |
|---|---|---|
| Rp0.21) | Rm | A2" |
| MPa | MPa | % |
| ≥283 | ≥690 | ≥40 |
At 68oF, imperial units
| Proof strength | Tensile strength | Elongation |
|---|---|---|
| Rp0.21) | Rm | A2" |
| ksi | ksi | % |
| ≥41 | ≥100 | ≥40 |
1) Corresponds to 0.2% offset yield strength
Physical properties
Density: 8.89 g/m3 (0.321 lb/in3)
Thermal conductivity
| Temperature, °C | W/(m °C) | Temperature, °F | Btu/(ft h°F) |
|---|---|---|---|
| -168 | 7.2 | -270 | 4.2 |
| -73 | 8.7 | -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, °C | J/(kg °C) | Temperature, °F | Btu/(lb °F) |
|---|---|---|---|
| 20 | 427 | 68 | 0.10 |
Thermal expansion, mean values in temperature ranges (x10-6)
| Temperature, °C | Per °C | Temperature, °F | Per °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, °C | µΩm | Temperature, °F | µΩin. |
|---|---|---|---|
| 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, °C | MPa | Temperature, °F | ksi |
|---|---|---|---|
| 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.