Sanicro® 70

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Description

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)

Related Standards

Equivalent Materials

Los datos sobre este material han sido proporcionados por Sandvik Materials Technology.

A menos que se indique lo contrario, todas las medidas corresponden a condiciones de temperatura ambiente. A menos que se indique lo contrario, se utilizan las unidades del SI.
Las normas armonizadas son similares a uno o varios estándares del proveedor. Es posible que algunas normas armonizadas se ajusten al estándar original, mientras que otras pueden quedar fuera de su alcance.

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Propiedades

General

PropertyTemperatureValue

Densidad

23.0 °C

8.4 g/cm³

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Mecánica

PropertyTemperatureValueComment

Alargamiento A2

23.0 °C

35 %

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min.

Dureza Vickers

23.0 °C

160 [-]

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Elongación

23.0 °C

35 %

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min.

Límite elástico Rp 0,2

20.0 °C

205 MPa

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

100.0 °C

200 MPa

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

200.0 °C

180 MPa

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

300.0 °C

170 MPa

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

400.0 °C

160 MPa

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

500.0 °C

140 MPa

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

600.0 °C

100 MPa

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

Límite elástico Rp0.1

23.0 °C

265 MPa

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min. for Cold finished, Hot finished ≥205 MPa

Módulo elástico

20.0 °C

214 GPa

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100.0 °C

206 GPa

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200.0 °C

202 GPa

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300.0 °C

196 GPa

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400.0 °C

190 GPa

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500.0 °C

185 GPa

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600.0 °C

180 GPa

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700.0 °C

171 GPa

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800.0 °C

161 GPa

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900.0 °C

149 GPa

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1000.0 °C

135 GPa

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Resistencia a la tracción

20.0 °C

550 - 700 MPa

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100.0 °C

555 MPa

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200.0 °C

530 MPa

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300.0 °C

510 MPa

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400.0 °C

500 MPa

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500.0 °C

490 MPa

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600.0 °C

480 MPa

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Aplicaciones térmicas

PropertyTemperatureValueComment

Calor específico

20.0 °C

460 J/(kg·K)

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100.0 °C

480 J/(kg·K)

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200.0 °C

495 J/(kg·K)

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300.0 °C

510 J/(kg·K)

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400.0 °C

515 J/(kg·K)

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500.0 °C

525 J/(kg·K)

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600.0 °C

590 J/(kg·K)

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Coeficiente de dilatación térmica

100.0 °C

1.35E-5 1/K

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for 30°C to the mentioned temperature

200.0 °C

1.4E-5 1/K

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for 30°C to the mentioned temperature

300.0 °C

1.4E-5 1/K

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for 30°C to the mentioned temperature

400.0 °C

1.45E-5 1/K

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for 30°C to the mentioned temperature

500.0 °C

1.5E-5 1/K

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for 30°C to the mentioned temperature

600.0 °C

1.55E-5 1/K

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for 30°C to the mentioned temperature

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Conductividad térmica

20.0 °C

13 W/(m·K)

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100.0 °C

14 W/(m·K)

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200.0 °C

16 W/(m·K)

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300.0 °C

17 W/(m·K)

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400.0 °C

19 W/(m·K)

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500.0 °C

21 W/(m·K)

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600.0 °C

25 W/(m·K)

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Chemical properties

PropertyValueComment

Azufre

0.015 %

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max.

Carbono

0.05 %

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max.

Cobre

0.5 %

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max.

Cromo

16.5 %

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Fósforo

0.02 %

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max.

Hierro

10 %

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Manganeso

0.8 %

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Níquel

72.5 %

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Silicona

0.4 %

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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.