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Sanicro® 70: High-Temperature Austenitic Alloy with Superior Carburization & SCC Resistance

Sanicro® 70 is an austenitic nickel-chromium-iron (NiCrFe) alloy characterized by very good resistance to carburization and nitrogen absorption and good structural stability at high temperatures. It also has good resistance to stress corrosion cracking (SCC).


More technical information and charts that are relevant to the materials corrosion, mechanical and physical performance are displayed in the figures on the right side of the material page.


Datasheet URL:

Sanicro® 70


Datasheet updated 2019-03-15 15:32 (supersedes all previous editions)

Properties

General

PropertyTemperatureValue

Density

23.0 °C

8.4 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

214 GPa

100.0 °C

206 GPa

200.0 °C

202 GPa

300.0 °C

196 GPa

400.0 °C

190 GPa

500.0 °C

185 GPa

600.0 °C

180 GPa

700.0 °C

171 GPa

800.0 °C

161 GPa

900.0 °C

149 GPa

1000.0 °C

135 GPa

Elongation

23.0 °C

35 %

min.

Elongation A2

23.0 °C

35 %

min.

Hardness, Vickers

23.0 °C

160 [-]

Tensile strength

20.0 °C

550 - 700 MPa

100.0 °C

555 MPa

200.0 °C

530 MPa

300.0 °C

510 MPa

400.0 °C

500 MPa

500.0 °C

490 MPa

600.0 °C

480 MPa

Yield strength Rp0.1

23.0 °C

265 MPa

min. for Cold finished, Hot finished ≥205 MPa

Yield strength Rp0.2

20.0 °C

205 MPa

min. Cold finished OD≤127 mm ≥241 MPa / Cold finished OD>127 mm ≥205 / Hot finished ≥205

100.0 °C

200 MPa

min. Cold finished OD≤127 mm ≥241 MPa / Cold finished OD>127 mm ≥205 / Hot finished ≥205

200.0 °C

180 MPa

min. Cold finished OD≤127 mm ≥241 MPa / Cold finished OD>127 mm ≥205 / Hot finished ≥205

300.0 °C

170 MPa

min. Cold finished OD≤127 mm ≥241 MPa / Cold finished OD>127 mm ≥205 / Hot finished ≥205

400.0 °C

160 MPa

min. Cold finished OD≤127 mm ≥241 MPa / Cold finished OD>127 mm ≥205 / Hot finished ≥205

500.0 °C

140 MPa

min. Cold finished OD≤127 mm ≥241 MPa / Cold finished OD>127 mm ≥205 / Hot finished ≥205

600.0 °C

100 MPa

min. Cold finished OD≤127 mm ≥241 MPa / Cold finished OD>127 mm ≥205 / Hot finished ≥205

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.35E-5 1/K

for 30°C to the mentioned temperature

200.0 °C

1.4E-5 1/K

for 30°C to the mentioned temperature

300.0 °C

1.4E-5 1/K

for 30°C to the mentioned temperature

400.0 °C

1.45E-5 1/K

for 30°C to the mentioned temperature

500.0 °C

1.5E-5 1/K

for 30°C to the mentioned temperature

600.0 °C

1.55E-5 1/K

for 30°C to the mentioned temperature

Specific heat capacity

20.0 °C

460 J/(kg·K)

100.0 °C

480 J/(kg·K)

200.0 °C

495 J/(kg·K)

300.0 °C

510 J/(kg·K)

400.0 °C

515 J/(kg·K)

500.0 °C

525 J/(kg·K)

600.0 °C

590 J/(kg·K)

Thermal conductivity

20.0 °C

13 W/(m·K)

100.0 °C

14 W/(m·K)

200.0 °C

16 W/(m·K)

300.0 °C

17 W/(m·K)

400.0 °C

19 W/(m·K)

500.0 °C

21 W/(m·K)

600.0 °C

25 W/(m·K)

Chemical properties

PropertyValueComment

Carbon

0.05 %

max.

Chromium

16.5 %

Copper

0.5 %

max.

Iron

10 %

Manganese

0.8 %

Nickel

72.5 %

Phosphorus

0.02 %

max.

Silicon

0.4 %

Sulfur

0.015 %

max.

Technological properties

Property
Application areas

Sanicro® 70 has good resistance to chlorine and hydrogen chloride at high temperatures and can therefore be used in the production of chlorinated hydrocarbons, e.g. in the oxychlorination reactor and the cracking furnace in vinylchloride plants.

Sanicro® 70 can also be used in wet corrosive conditions, where austenitic 18Cr/8Ni steels would be susceptible to stress corrosion cracking.

Corrosion properties

General corrosion: Sanicro® 70 has approximately the same resistance to organic and inorganic acids as steel of the AISI 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 AISI 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)
  • Up to 800°C (1470°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 high nickel content the material should not be used in reducing, sulphurous atmospheres (containing hydrogen sulphide) at temperatures above 550°C (1020°F).

    Heat Treatment

    The tubes are delivered in heat treated condition. If another heat treatment is needed after further processing the following is recommended.

    Stress relieving: 800-875°C (1470-1920°F), 10-15 minutes, cooling air.

    Solution annealing: 950-1050°C (1740-1920°F), 5-30 minutes, rapid cooling in air or water.

    Heat treatment after cold bending is not normally necessary, but this point must be decided with regard to the degree of bending and the operating conditions. Heat treatment, if any, should take the form of stress relieving or solution annealing.

    Hot forming

    Hot bending is carried out at 1100-850°C (2010-1560°F) and should be followed by solution annealing.

    Other

    Forms of supply:

    Tube and pipe are normally supplied in the solution annealed and white-pickled condition. Small sizes, e.g. heat exchanger tubes, can also be supplied in the bright-annealed condition. The principal size range is shown in the figure on the right.

    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.


    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)
    • MMA/SMAW welding
      • ISO 14172 E Ni 6182/AWS A5.11 ENiCrFe-3 (e.g. Exaton Ni71)
      • ISO 14172 E Ni 6152/AWS A5.11 ENiCrFe-7 (e.g. Exaton Ni69)


    Overlay welding:

  • ISO 18274 S Ni 6082/AWS A5.14 ERNiCr-3 (e.g. Exaton Ni72HP) wire and strip electrodes are recommended for overlay welding of tube sheets and high-pressure vessels in cases where corrosion resistance, equal to that of Sanicro® 70, is required.


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