Alloy 625 / 2.4856

Nombres alternativos y comerciales
Alloy 625
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Description

Alloy 625 is a low carbon (0.03%) nickel-chromium-molybdenum-niobium alloy which has excellent corrosion resistance to a wide range of corrosive media. Alloy 625 is normally supplied in annealed condition for wet corrosion applications and is TÜV-approved for pressure vessels in the temperature range from -196°C to 450°C.

Related Standards

Equivalent Materials

Los datos sobre este material han sido proporcionados por Hempel Special Metals.

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.

Ashby charts

Propiedades

General

PropertyTemperatureValue

Densidad

23.0 °C

8.44 g/cm³

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Mecánica

PropertyTemperatureValueComment

Resistencia al choque, ensayo Charpy entallado

23.0 °C

1250 kJ/m²

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min.

Aplicaciones térmicas

PropertyValue

Temperatura de fusión

1290 - 1350 °C

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Chemical properties

PropertyValueComment

Aluminio

0.4 %

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Azufre

0.01 %

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max.

Carbono

0.03 %

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Cobalto

1 %

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max.

Cromo

21 - 23 %

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Fósforo

0.01 %

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max.

Hierro

0.4 %

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max.

Manganeso

0.5 %

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max.

Molibdeno

8 - 10 %

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Niobio

3.2 - 3.8 %

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Ta+Nb

Níquel

Balance

Silicona

0.4 %

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max.

Titanio

0.4 %

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max.

Tántalo

3.2 - 3.8 %

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Ta+Nb

Technological properties

Property
Application areas

2.4856 is used for:


  • Natural gas pipelines
  • Production systems and pipe coverings of riser pipes in oil production
  • Preparation of phosphoric acid
  • Shipbuilding and marine water lines
  • Plants for the treatment of radioactive waste
  • Flue gas scrubbers and dampers in flue gas cleaning systems

  • Corrosion properties

    In annealed condition (grade 1) Alloy 625:


  • Resistance to chlorine-induced stress corrosion cracking
  • high resistance to mineral acids such as nitric, phosphoric, sulfuric, and hydrochloric acid
  • good resistance to alkalis and organic acids
  • exceptional resistance to pitting, crevice, erosion and intergranular corrosion

  • Other

    Annealed Alloy 625 loses notched impact strength at room temperature after having been exposed to temperatures in the range from 538 ° C to 593 ° C

    Welding

    Welding rods and wire electrodes:

  • Nicrofer S 6020 - FM 625 (2.4831)
  • DIN EN ISO 18274: S Ni 6625 (NiCr22Mo9Nb)
  • UNS N06625
  • AWS: 5.14: ErNiCrMo3


    Covered electrodes:

  • DIN EN ISO 14172: E Ni 6625 (NiCr22Mo9Nb) (2.4621)
  • UNS W86112
  • AWS A5.11: ENiCrMo-3