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

VdTÜV Data Sheet 499

Equivalent Materials

This material data has been provided by Hempel Special Metals.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
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

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Properties

General

Property	Temperature	Value
Density	23.0 °C	8.44 g/cm³ Show Supplier Material materials with Density of 8.44 g/cm³

Mechanical

Property	Temperature	Value	Comment
Impact strength, Charpy notched	23.0 °C	1250 kJ/m² Show Supplier Material materials with Impact strength, Charpy notched of 1250 kJ/m²	min.

Thermal

Property	Value
Melting point	1290 - 1350 °C Show Supplier Material materials with Melting point of 1290 - 1350 °C

Chemical properties

Property	Value	Comment
Aluminium	0.4 % Show Supplier Material materials with Aluminium of 0.4 %
Carbon	0.03 % Show Supplier Material materials with Carbon of 0.03 %
Chromium	21 - 23 % Show Supplier Material materials with Chromium of 21 - 23 %
Cobalt	1 % Show Supplier Material materials with Cobalt of 1 %	max.
Iron	0.4 % Show Supplier Material materials with Iron of 0.4 %	max.
Manganese	0.5 % Show Supplier Material materials with Manganese of 0.5 %	max.
Molybdenum	8 - 10 % Show Supplier Material materials with Molybdenum of 8 - 10 %
Nickel	Balance
Niobium	3.2 - 3.8 % Show Supplier Material materials with Niobium of 3.2 - 3.8 %	Ta+Nb
Phosphorus	0.01 % Show Supplier Material materials with Phosphorus of 0.01 %	max.
Silicon	0.4 % Show Supplier Material materials with Silicon of 0.4 %	max.
Sulfur	0.01 % Show Supplier Material materials with Sulfur of 0.01 %	max.
Tantalum	3.2 - 3.8 % Show Supplier Material materials with Tantalum of 3.2 - 3.8 %	Ta+Nb
Titanium	0.4 % Show Supplier Material materials with Titanium of 0.4 %	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