What is 2.4858?

2.4858 is the Werkstoff (W.Nr.) designation for the nickel-based Alloy 825.

Alloy 825, also known as Incoloy^® 825 (UNS N08825 / W.Nr. 2.4858), is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed primarily to better resist sulphuric acid: copper additions improve resistance to reducing environments such as sulphuric acid, a property also used in Ferralium^® 255 (2% copper) and in the much more highly alloyed Alloy 20 (3-4% copper).

Temperature range

The mechanical properties of Alloy 825 stay relatively constant from cryogenic temperatures (around -150degC) up to 540degC. Above this, undesirable microstructural phase changes can significantly reduce impact toughness and elongation.

Stock and applications

We carry a significant stock of Alloy 825 solid bar, from 3/4" up to 10" in a large number of incremental sizes. Applications our customers serve include valve components, thermowells and sensors, fasteners, and downhole tooling that makes use of its non-magnetic properties.

Frequently asked questions

What is Werkstoff 2.4858, and what alloy does it describe?

2.4858 is the Werkstoff (W.Nr.) designation for the nickel-based Alloy 825, also known as Incoloy 825 (UNS N08825). It is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium, developed primarily to better resist sulphuric acid in demanding chemical process environments.

Why does copper improve Alloy 825's (2.4858) resistance to sulphuric acid?

Copper additions improve resistance to reducing environments such as sulphuric acid, a property also used in Ferralium 255 (2% copper) and in the much more highly alloyed Alloy 20 (3-4% copper). This shared mechanism explains why copper-bearing alloys are specified across such acid-handling applications.

What temperature range can Alloy 825 (2.4858) be used across?

Alloy 825's mechanical properties stay relatively constant from cryogenic temperatures, around -150°C, up to 540°C. Above this, undesirable microstructural phase changes can significantly reduce impact toughness and elongation, so applications above 540°C generally call for a more highly alloyed nickel grade instead.

What sizes and applications does Langley Alloys supply Alloy 825 (2.4858) for?

Langley Alloys carries a significant stock of Alloy 825 solid bar, from 3/4" up to 10" in a large number of incremental sizes. Applications served include valve components, thermowells and sensors, fasteners, and downhole tooling that makes use of the alloy's non-magnetic properties.

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