Alloy 625 / 2.4856

Alternative and trade names
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

This material data has been provided by Hempel Special Metals.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

General

PropertyTemperatureValue

Density

23.0 °C

8.44 g/cm³

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Mechanical

PropertyTemperatureValueComment

Impact strength, Charpy notched

23.0 °C

1250 kJ/m²

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min.

Thermal

PropertyValue

Melting point

1290 - 1350 °C

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Chemical properties

PropertyValueComment

Aluminium

0.4 %

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Carbon

0.03 %

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Chromium

21 - 23 %

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Cobalt

1 %

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max.

Iron

0.4 %

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max.

Manganese

0.5 %

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max.

Molybdenum

8 - 10 %

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Nickel

Balance

Niobium

3.2 - 3.8 %

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Ta+Nb

Phosphorus

0.01 %

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max.

Silicon

0.4 %

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max.

Sulfur

0.01 %

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max.

Tantalum

3.2 - 3.8 %

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Ta+Nb

Titanium

0.4 %

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max.

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