Sanicro® 70, commonly known as Alloy 600, is an austenitic nickel-chromium-iron alloy. It is characterized by:
- Very good resistance to carburization and nitrogen absorption
- Good structural stability at high temperatures
- Good resistance to stress corrosion cracking
Standards
- UNS: N06600
- W.Nr.: 2.4816
- BS: HR208
Product standards
Suitable for production of flanges etc. according to ASTM B564
Certificates
Status according to EN 10 204 3.1
Chemical composition (nominal) %
| C |
Si | Mn | P |
S |
Cr | Ni | Others |
|---|---|---|---|---|---|---|---|
| 0.06 | 0.4 | 0.8 | ≤0.015 | ≤0.015 | 16.5 | 72.5 | Ti=0.15 Fe=9.5 |
Applications
Sanicro® 70 is used in a variety of applications in the chemical industry, which require high strength and good corrosion resistance .
High strength, combined with oxidation resistance at high temperatures, makes the material useful also for different components in heating furnaces.
The material can also be used in wet corrosive conditions, where austenitic 18Cr/8Ni steels would be susceptible to stress corrosion cracking.
| Industrial categories | Typical applications |
|---|---|
| Chemical industry | Flanges |
| Food industry | Valves and discs |
| Petrochemical industry | Fittings |
| Pulp and paper industry | Couplings |
| Pickling equipment | Rings and seals |
| Oil & Gas industry | Bolts and nuts |
| Nuclear plants | Shafts |
| Forgings | |
| Piping | |
| Pumps | |
| Tanks |
Corrosion resistance
General corrosion
Sanicro® 70 has approximately the same resistance to organic and inorganic acids as steel of the ASTM 304 type. Its resistance to sodium hydroxide is very good even at high concentrations and temperatures.
Pitting
Resistance to pitting is equal to that of steel of the ASTM 304 type.
Stress corrosion cracking
Sanicro® 70 has very good resistance to stress corrosion cracking, particularly in chloride-bearing solution.
Gas corrosion
Sanicro® 70 has very good oxidation resistance. It can be used in:
- air up to 1175°C (2145°F)
- dry chlorine and hydrogen chloride up to about 550°C (1020°F)
- synthesis gas (ammonia synthesis) up to 600°C (1110°F). The resistance to nitrogen absorption, e.g. cracked ammonia at high temperatures, is very good.
Due to the high nickel content, the material should not be used in reducing, sulphurous atmospheres (containing hydrogen sulphide), at temperatures above 550°C (1020°F).
Forms of supply
Sizes and tolerances
Round-cornered square, as well as round billets, are produced in a wide range of sizes according to the following tables. Larger sizes offered on request.
Surface conditions
Square billets
Unground, spot ground or fully ground condition.
Round billets
Peel turned or black condition.
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 80 | +/-2 | 4 - 6.3 |
| 100, 114, 126, 140, 150 | +/-3 | 4 - 6.3 |
| 160, 180, 195, 200 | +/-4 | 4 - 6.3 |
| >200 - 350 | +/-5 | 3 - 5.3 |
Sizes and tolerances apply to the rolled/forged condition.
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 75 - 200 (5 mm interval) | +/-1 | max 10 |
| >200 - 450 | +/-3 | 3 - 8 |
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 77 - 112 (5 mm interval) | +/-2 | max 10 |
| 124, 134 | +/-2 | max 10 |
| 127, 147, 157 | +/-2 | max 10 |
| 142, 152, 163 | +/-2 | max 10 |
| 168, 178, 188 | +/-2 | max 10 |
| 183, 193 | +/-2 | max 10 |
Other products
- Seamless tube and pipe
- Hollow bar
Heat treatment
Billets are delivered in hot worked condition. Depending on the properties required the recommendations for heat treatment differ.
For a combination of the optimum tensile and fatigue properties, a low annealing temperature range of 870-980°C (1600-1800°F) should be used.
For an optimum combination of fatigue resistance and creep rupture properties at high temperatures, the material should be annealed at 1120-1200°C (2050-2200°F). Both treatments are followed by quenching in water.
Mechanical properties
Sanicro® 70 conforms to the required mechanical properties according to specification ASTM B564. Testing is performed on separately solution annealed and quenched test pieces.
At 20 oC
|
Proof strength
|
Tensile strength
|
Elongation
|
|---|---|---|
|
Rp0.21)
|
Rm
|
A
|
|
MPa
|
MPa
|
%
|
|
≥241
|
≥552
|
≥30
|
At 68 oF
|
Proof strength
|
Tensile strength
|
Elongation
|
|---|---|---|
|
Rp0.21)
|
Rm
|
A
|
|
ksi
|
ksi
|
%
|
|
≥35
|
≥80
|
≥30
|
1) Corresponds to 0.2 % offset yield strength
At high temperatures
Fig. 1 shows indicative values for tensile strength properties of Sanicro 70 at high temperatures.
Physical properties
Density: 8.4 g/cm3, 0.30 lb/in3
Scaling temperature in air: 1175 °C, 2145 °F
| Temperature, °C | J/kg °C | Temperature, °F | Bru/lb °F |
|---|---|---|---|
| 20 | 460 | 68 | 0.11 |
| 200 | 495 | 400 | 0.12 |
| 400 | 515 | 800 | 0.12 |
| 600 | 590 | 1100 | 0.14 |
1) typical values
| Temperature, °C | W/m °C | Temperature, °F | Btu/ft h °F |
|---|---|---|---|
| 20 | 13 | 68 | 7.5 |
| 200 | 16 | 400 | 9 |
| 400 | 19 | 800 | 11 |
| 600 | 25 | 1100 | 15 |
1) typical values
| Temperature, C | Per °C | Temperature, °F | Per F |
|---|---|---|---|
| 30-200 | 14 | 86-400 | 7.5 |
| 30-400 | 14.5 | 86-800 | 8 |
| 30-600 | 15.5 | 86-1100 | 8.5 |
1) typical values (x10-6)
| Temperature, °C | MPa | Temperature, °F | ksi |
|---|---|---|---|
| 20 | 214 | 68 | 31.0 |
| 200 | 202 | 400 | 29.3 |
| 400 | 190 | 800 | 27.4 |
| 600 | 180 | 1200 | 25.5 |
| 800 | 161 | 1600 | 22.1 |
| 1000 | 135 |
1) typical values(x103)
Hot working
Hot working should be carried out at a material temperature of 900-1200°C (1650-2200°F), followed by cooling in water. If additional heat treatment is needed, it should be carried out in accordance with the recommendations given for heat treatment.
Welding
The weldability of Sanicro® 70 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. Preheating and post-weld heat treatment are normally not necessary.
For Sanicro® 70, heat-input of <1.0 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 6082/AWS A5.14 ERNiCr-3 (e.g. Exaton Ni72HP)
Machining
Machining Sanicro® 70, as with stainless steels, requires an adjustment to tooling data and machining method, in order to achieve satisfactory results. Compared to Sanmac® 316/316L, the cutting speed must be reduced by approximately 15-20%, when turning Sanicro® 70 with coated, cemented carbide tools. Much the same applies to other operations. Feeds should only be reduced slightly and with care.
Detailed recommendations for the choice of tools and cutting data are provided in the data sheet for Sanmac® 316/316L.
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.