Dillinger wear resistant DILLIDUR quench-hardening plates
DILLIDUR is one of the proprietary steels from Dillinger and is used to produce high‑quality quenched plates. The foundation for this is laid in the steelmaking plant, where wear resistant DILLIDUR steels are subjected to vacuum‑stream degassing. This process – combined with sophisticated secondary metallurgy – reduces undesirable impurity elements, such as sulphur, for example, to a minimum.
A high‑grade plate, particularly in greater thicknesses, needs under all circumstances sufficiently thick and homogeneous primary material. Dillinger has the capability for casting this primary material to so‑called slabs up to record thicknesses of 600 mm, using continous casting.
The slab is then rolled into a plate in the rolling process. Extraordinary roll‑separation forces of up to 108 MN (approx. 11,000 t) act during this process. Here, the rolling‑pass schedule, i.e. the temperature‑dependent sequence of rolling operations, is decisive. Rolling takes place in the largest possible steps, so‑called "passes". This principle of "high‑shape rolling" deforms not only the plate surface, but also its centre. Such deformation in the centre generates the most homogeneous plate possible from the surface through into the plate centre.
DILLIDUR steels meet extremely demanding standards for surface hardness and, in many instances, also for through‑hardening. These steels’ extraordinary resistance to wear, and their surface hardness, are achieved via their treatment in quenching systems. The plate material is cooled extremely rapidly with water under controlled conditions. This results in a microstructure hardened uniformly throughout the entire surface of the plate. This hard microstructure is a characteristic of the wear resistance of the DILLIDUR 400 to 600 grades.
Air-hardened DILLIDUR 325 L is available for applications for high service temperatures up to around 500 °C and for hot-formed wear parts.
Thick‑walled and welded wear parts for adverse service in mines demand special resistance to cracking. The solution here is DILLIDUR IMPACT with its guaranteed Charpy V‑notch toughness.
In its DILLIDUR steels, Dillinger achieves the combination of apparently contradictory materials properties: maximum wear resistance coupled with simple and reliable workability and weldability.
DILLIDUR has been in successful use in excavators, and in demolition and recycling equipment, up to and including giant machines for the recovery of mineral resources, for more than fifty years.
Steel grades – an overview:
Christoph Dickmann
Sales Earth moving & Mining equipment, Heavy Machinery, Mold & Die construction
Tel.: +49 6831 472385
Fax: +49 6831 47992681
Stefan Ackermann
Sales Stockists & Steel Service Centers
Tel.: +49 6831 472195
Fax: +49 6831 474580
Aktien-Gesellschaft der Dillinger Hüttenwerke, Werkstraße 1, 66763 Dillingen/Saar, Telefon: +49 6831 47 0, Telefax: +49 6831 47 2212, Sitz: Dillingen/Saar, Registergericht: Amtsgericht Saarbrücken HRB 23001, Vorsitzender des Aufsichtsrats: Reinhard Störmer, Vorstand: Stefan Rauber (Vors.), Joerg Disteldorf, Daniël Nicolaas van der Hout, Dr. Peter Maagh, Markus Lauer, Jonathan Weber
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Copyright © 2016 Dillinger. All rights reserved.