Sanicro® 61 is a nickel-chromium alloy characterized by:
- Good strength at high temperatures
- Excellent resistance to high temperature corrosion, particularly in oxidizing conditions
The alloy is suitable for a wide range of applications where resistance to both heat and corrosion is a requirement.
Standards
- UNS: N06601
Product standards
- ASTM B167
- ASME SB167
Chemical composition (nominal) %
| C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| 0.03 | 0.3 | 0.6 | ≤0.025 | ≤0.015 | 23 | 60 |
Others:
Al=1.3
Applications
Sanicro® 61 is a general-purpose, highly corrosion resistant alloy suitable for a wide range of high temperature applications such as:
- Muffle tubing
- Recuperators
- Superheaters
- Thermocouple protection tubes
Forms of supply
Sanicro® 61 seamless nickel alloy tubing is supplied bright annealed in the outside diameter range 27.67-48.3 mm (0.75-1.5 in. nominal) and wall-thickness range 2.0-4.0 mm (0.079-0.160 in.).
Tolerances
| Size OD, mm |
Tolerances OD, mm |
Wall thickness % |
|---|---|---|
| 26.67-48.3 | +0.4/-0.8 | +/-10 |
Mechanical properties
At 20 oC (68 oF)
| Proof strength | Tensile strength | Elong. | ||
|---|---|---|---|---|
| Rp0.21) | Rm | A2" | ||
| MPa | ksi | MPa | ksi | % |
| ≥205 | ≥30 | 550-760 | 80-110 | ≥30 |
1 MPa = 1 N/mm2
1) Rp0.2 corresponds to 0.2% offset yield strength
Corrosion resistance
Sanicro® 61 has superior resistance to, in particular, oxidation at high temperatures up to 1200°C (2200°F). The grade also offers excellent resistance to oxide scaling under cyclic thermal conditions, largely owing to the addition of aluminium.
Physical properties
Density, at 20 °C; 68°F : 8.1 g/cm3, 0.29 lb/in3
Thermal conductivity
| Temperature, °C | W/(m °C) | Temperature, °F | Btu/(ft h°F) |
|---|---|---|---|
| 20 | 11.2 | 68 | 6.5 |
| 100 | 12.7 | 200 | 7.3 |
| 200 | 14.3 | 400 | 8.3 |
| 300 | 16.0 | 600 | 9.4 |
| 400 | 17.7 | 800 | 10.5 |
| 500 | 19.5 | 1000 | 11.6 |
| 600 | 21.0 | 1200 | 12.8 |
| 700 | 22.8 | 1400 | 13.8 |
| 800 | 24.4 | 1600 | 14.8 |
| 900 | 26.1 | 1800 | 15.8 |
| 1000 | 27.8 | 2000 | 16.9 |
Specific heat capacity
| Temperature, °C | J/(kg °C) | Temperature, °F | Btu/(lb °F) |
|---|---|---|---|
| 20 | 448 | 68 | 0.11 |
| 100 | 469 | 200 | 0.11 |
| 200 | 498 | 400 | 0.12 |
| 300 | 523 | 600 | 0.13 |
| 400 | 548 | 800 | 0.13 |
| 500 | 578 | 1000 | 0.14 |
| 600 | 603 | 1200 | 0.15 |
| 700 | 632 | 1400 | 0.16 |
| 800 | 657 | 1600 | 0.16 |
| 900 | 686 | 1800 | 0.17 |
| 1000 | 712 | 2000 | 0.18 |
Thermal expansion, mean values in temperature ranges (x10-6)
| Temperature, °C | Per °C | Temperature, °F | Per °F |
|---|---|---|---|
| 30-100 | 13.8 | 86-200 | 7.6 |
| 30-200 | 14.4 | 86-400 | 8.0 |
| 30-300 | 14.6 | 86-600 | 8.1 |
| 30-400 | 14.8 | 86-800 | 8.3 |
| 30-500 | 15.2 | 86-1000 | 8.5 |
| 30-600 | 15.6 | 86-1200 | 8.9 |
| 30-700 | 16.1 | 86-1400 | 9.2 |
| 30-800 | 16.7 | 86-1600 | 9.5 |
| 30-900 | 17.2 | 86-1800 | 9.8 |
| 30-1000 | 17.8 | 86-2000 | 10.2 |
Resistivity
| Temperature, °C | µΩm | Temperature, °F | µΩin. |
|---|---|---|---|
| 20 | 1.18 | 68 | 46.5 |
| 100 | 1.19 | 200 | 46.9 |
| 200 | 1.21 | 400 | 47.6 |
| 300 | 1.22 | 600 | 48.1 |
| 400 | 1.23 | 800 | 48.5 |
| 500 | 1.24 | 1000 | 48.9 |
| 600 | 1.25 | 1200 | 49.2 |
| 700 | 1.25 | 1400 | 49.2 |
| 800 | 1.25 | 1600 | 49.3 |
| 900 | 1.26 | 1800 | 49.6 |
| 1000 | 1.26 | 2000 | 49.9 |
Modulus of elasticity (x103) (annealed condition)
| Temperature, °C | MPa | Temperature, °F | ksi |
|---|---|---|---|
| 20 | 207 | 68 | 30.0 |
| 100 | 202 | 200 | 29.4 |
| 200 | 197 | 400 | 28.5 |
| 300 | 191 | 600 | 27.6 |
| 400 | 185 | 800 | 26.6 |
| 500 | 178 | 1000 | 25.4 |
| 600 | 170 | 1200 | 24.1 |
| 700 | 161 | 1400 | 22.5 |
| 800 | 150 | 1600 | 20.5 |
| 900 | 138 | 1800 | 18.4 |
| 1000 | 125 | 2000 | 16.2 |
Welding
The weldability of Sanicro® 61 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® 61, 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 6601/AWS A5.14 ERNiCrFe-11
ISO 18274 S Ni 6617/AWS A5.14 ERNiCrCoMo-1 (e.g. Exaton Sanicro 53)
MMA/SMAW welding
ISO 14172 E Ni 6117/AWS A5.11 ENiCrCoMo-1