Sanicro 30 Cold Worked

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Description

Sanicro® 30 is a low-carbon version of Alloy 800 austenitic nickel-iron-chromium alloy. The grade is used for steam generator tubing in nuclear stations (PWR) and other heat exchangers for temperature up to about 550°C (1020°F) where good resistance to stress corrosion cracking (SCC) and intergranular corrosion is required.


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Sanicro 30 Cold Worked


Datasheet updated 2019-09-19 07:12 (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 g/cm³

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Mecánica

PropertyTemperatureValueComment

Alargamiento A2

23.0 °C

30 %

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min.

Dureza Vickers

23.0 °C

170 [-]

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Límite elástico Rp 0,2

20.0 °C

335 MPa

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min.

100.0 °C

325 MPa

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min.

200.0 °C

310 MPa

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min.

300.0 °C

300 MPa

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min.

400.0 °C

290 MPa

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min.

500.0 °C

280 MPa

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min.

600.0 °C

275 MPa

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min.

Límite elástico Rp0.1

20.0 °C

335 MPa

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min.

100.0 °C

335 MPa

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min.

200.0 °C

320 MPa

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min.

300.0 °C

310 MPa

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min.

400.0 °C

300 MPa

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min.

500.0 °C

290 MPa

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min.

600.0 °C

285 MPa

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min.

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Módulo elástico

20.0 °C

200 GPa

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400.0 °C

175 GPa

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600.0 °C

160 GPa

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Resistencia a la tracción

23.0 °C

570 - 700 MPa

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Aplicaciones térmicas

PropertyTemperatureValueComment

Calor específico

20.0 °C

475 J/(kg·K)

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100.0 °C

500 J/(kg·K)

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200.0 °C

515 J/(kg·K)

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300.0 °C

525 J/(kg·K)

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400.0 °C

525 J/(kg·K)

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500.0 °C

535 J/(kg·K)

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600.0 °C

585 J/(kg·K)

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Coeficiente de dilatación térmica

100.0 °C

1.6E-5 1/K

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for 20°C to the mentioned temperature

200.0 °C

1.6E-5 1/K

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for 20°C to the mentioned temperature

300.0 °C

1.6E-5 1/K

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for 20°C to the mentioned temperature

400.0 °C

1.65E-5 1/K

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for 20°C to the mentioned temperature

500.0 °C

1.65E-5 1/K

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for 20°C to the mentioned temperature

600.0 °C

1.7E-5 1/K

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for 20°C to the mentioned temperature

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Conductividad térmica

20.0 °C

12 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

18 W/(m·K)

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500.0 °C

20 W/(m·K)

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600.0 °C

23 W/(m·K)

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Eléctrico

PropertyTemperatureValue

Resistividad eléctrica

20.0 °C

9.9E-7 Ω·m

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100.0 °C

1.01E-6 Ω·m

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200.0 °C

1.03E-6 Ω·m

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300.0 °C

1.05E-6 Ω·m

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400.0 °C

1.08E-6 Ω·m

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500.0 °C

1.12E-6 Ω·m

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600.0 °C

1.18E-6 Ω·m

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Chemical properties

PropertyValueComment

Aluminio

0.3 %

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Azufre

0.015 %

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max.

Carbono

0.03 %

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max.

Cobalto

0.1 %

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Lower contents can be specified after agreement.

Cobre

0.1 %

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max.

Cromo

20 %

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Fósforo

0.02 %

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max.

Hierro

Balance

Manganeso

0.6 %

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Níquel

32 %

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Silicona

0.5 %

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Titanio

0.5 %

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Technological properties

Property
Certifications

Approvals: Approved for use according to ASME Boiler and Pressure Vessel Code Section III, division 1 and Section VIII, division 1 and 2

Cold Forming

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.

Corrosion properties

General corrosion: Sanicro® 30 has approximately the same resistance to organic and inorganic acids as steel of the ASTM TP 304 type. Its resistance to sodium hydroxide is very good except at the very highest concentrations and temperatures.


Pitting: The material has somewhat better resistance to pitting than steel of the ASTM TP 304 type.


Intergranular corrosion and stress corrosion cracking: In comparison with the standard Alloy 800, Sanicro® 30 has improved resistance both to intergranular corrosion and to intergranular stress corrosion cracking. This is obtained by a high degree of stabilization and a production sequence giving a small grain size. The resistance to trans- granular stress corrosion cracking is very good as for all high-nickel alloys.


Gas corrosion: In general this grade is not used at temperatures high enough for gas corrosion to be a problem. For such cases the appropriate metal to choose is Sanicro® 31HT. However, compared with Sanicro® 31HT, Sanicro® 30 has about the same resistance to gas corrosion.

Heat Treatment

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

Stress relieving: 800-875°C (1470-1605°F), 10-15 minutes, cooling in air.

Solution annealing: 950-1050°C (1740-1920°F), 1-10 minutes, rapid cooling in water or air.

Hot forming

Hot bending is carried out at 1050-850°C (1920-1560°F) and should be followed by solution annealing.

Other

Forms of supply:

Tube and pipe are supplied hot- or cold-worked, solution-annealed and white-pickled or bright-annealed. The principal size range can be seen from the figure on the right, but also certain sizes can be delivered on request.

Welding

The weldability of Sanicro® 30 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.


Since the material has low thermal conductivity and high thermal expansion. Welding plans should therefore be carefully selected in advance, so that distortions of the welded joint are minimized. If residual stresses are a concern, solution annealing can be performed after welding.

For Sanicro® 30, 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)