Special stainless steels represent a material group that is situated between the non-corrosive steels and the nickel alloys. These iron-nickel-chromium alloys differ from the ordinary non-corrosive steels by their higher alloying additions of nickel, chromium or molybdenum. Many corrosion-resistant alloys, such as VDM® Alloy 31, VDM® Alloy 800 H or VDM® Alloy 926, whose main alloying element is not nickel, but that still have a relatively high nickel content, are part of this group. Furthermore, we produce a number of not nickel-containing materials, which we also consider part of our special stainless steels.
For our high-alloy special stainless steels as for our classic nickel alloys applies: each of our alloys has a unique combination of properties, depending on their chemical composition and their manufacturing process.
We divide our nickel alloys and high-alloy special stainless steels into the following material groups:
Corrosive media such as sea water, acids, alkali and salt solutions make for a rough and aggressive environment in many fields, where the materials used will need to possess an above average service life stability. The corrosion-resistant alloys of VDM Metals are an important part of production and processing plants for phosphorus and sulfuric acid or acid gas output. And they are highly suitable for processes involving acidic materials. In addition, our materials are among the most resistant in processes handling acidic media. They are used for reactors for acetic acid production and tanks for the storage and transportation of nitric and hydrofluoric acid mixtures. In offshore engineering they are found in gas pipelines, production tubing, drill stems, pipe claddings, umbilicals for oil production, seawater pipe, condensers and coolers.
Our heat conducting and resistance alloys are characterized by relatively high and/or constant specific electrical resistance values. The materials spectrum ranges from austenitic nickel-iron-chromium alloys to aluminum-containing ferritic chrome steels like VDM® Aluchrom Y Hf.
Heat conducting and resistance alloys are mostly found in the electronics industry as specialty wires or as brake and starting resistors for electric drive system. In addition, they are used wherever electrical energy is converted into heat, as in ceramic cook tops, toasters or coffee machines. Heat conducting and resistance materials by VDM Metals are usually available as strip or wires.
Our controlled expansion alloys are characterized by extremely low thermal expansion coefficients at low- as well as in high-temperature ranges; furthermore, they possess good ductility and toughness, as well as good mechanical properties and a low propensity to fatigue at low temperatures.
These alloys are used for
The small group of specialty alloys consists of materials with special physical or mechanical characteristics: VDM® Crofer 22 H, for instance, distinguishes itself with special expansion behavior, coordinated with the ceramic components of the so-called high-temperature fuel cells (solid oxide fuel cells). This ferritic steel contains between 20 and 24 percent chromium plus tungsten, niobium and lanthanum. VDM® NeutroShield is an austenitic stainless steel which is alloyed with boron. The finely-distributed boron secretions enable the absorption of thermal neutrons.
Have we sparked your interest? Here, you will find all the alloys in our production, including their relevant data sheets (subject to availability). You can filter our portfolio very simply by type of material, field of application and product form to obtain a quick and uncomplicated overview.