DILLIDUR IMPACT

Examples of application: heavy (welded) wear parts in earth moving, mining, demolition and recycling equipment

Cold forming means forming at temperatures below or equal 500 °C (932 °F).

DILLIDUR IMPACT is suitable for cold forming taking its high hardness into account. Flame cut or sheared edges in the bending area should be grinded before cold forming.

Cold forming of DILLIDUR IMPACT should be carried out according to the following recommendations, where t is the plate thickness:

Controlled water quenched and tempered.

Unless otherwise agreed, the general technical requirements in accordance with EN 10021 are applicable.

DILLIDUR IMPACT can be flame cut. For flame cutting, the following minimum preheating temperatures should be respected: 50 °C (122 °F) for plate thicknesses from 40 mm up to 70 mm and 100 °C (212 °F) for thicker plates.

Slow cooling after flame cutting and /or subsequent heating of the flame cut edge is beneficial for reducing detrimental stress concentration, especially for higher plate thickness.

DILLIDUR IMPACT can be welded with all conventional arc welding methods. Welding of DILLIDUR IMPACT requires special care due to its high hardness. Please consult EN 1011-2. Keep the surface dry and clean and use consumables with a low hydrogen content (type HD< 5 ml / 100 g in accordance with ISO 3690).

Use filler metals as soft as the loading of the construction and wear allow for. Because of the large plate thickness of DILLIDUR IMPACT, a minimum preheat and interpass temperature of 150 °C (302 °F) shall be respected.

If special requirements, which are not covered in this specification, are to be met by the steel due to its intended use or processing, these requirements are to be agreed before placing the order.

The information in this specification is a product description. This specification is updated at irregular intervals. The current version is relevant. The current version is available from the mill or as download at www.dillinger.de.

If a stress relieving temperature has to be considered, please contact the producer. The properties may be altered by a stress relief heat treatment.

If the temperature of 500 °C (932 °F) is exceeded, the initial tempering will be altered so that the mechanical properties are affected. To regain the initial properties new quenching and tempering become necessary.

However, water quenching of a formed work piece or component will often be less effective than the original quenching in the plate mill so that the fabricator may not be able to re-establish the properties required and therefore hot forming is not suitable.

Finally, it is the fabricator’s responsibility to obtain the required values of the steel through an appropriate heat treatment.

DILLIDUR IMPACT can be machined with HSS-drills and especially with HSS-Co-alloyed drills with a satisfactory service life if the drill advance and cutting speed are correspondingly accommodated.

The production range of DILLIDUR IMPACT plates is 40 mm (1.6 in.) to 150 mm (6 in.), please see delivery program. Other dimensions may be possible on request.

The steel is fully killed and fine grained through sufficient aluminium content.

The entire processing and application techniques are of fundamental importance to the reliability of the products made from this steel. The user should ensure that his design, construction and processing methods are aligned with the material, correspond to the state of the art that the fabricator has to comply with and are suitable for the intended use. The customer is responsible for the selection of the material. The recommendations in accordance with EN 1011-2 (Welding) and CEN/TR 10347 (Forming) as well as recommendations regarding job safety in accordance with national rules should be observed while considering the higher strength and hardenability.

Surface quality: Unless otherwise agreed, the surface will be in accordance with EN 10163-2, class A2.

Brinell surface hardness tests according to EN ISO 6506-1 are performed on a ground surface 0.5 mm – 2.0 mm below plate surface.

The impact tests are performed according to EN 10045-1 on Charpy-V test specimen taken in longitudinal direction at 1⁄4 plate thickness.

Brinell surface hardness tested once per heat and 40 t (metric tons).

Charpy tests are carried out once per heat.

Unless otherwise agreed, the test results are documented in an inspection certificate 3.1 in accordance with EN 10204.

Unless otherwise agreed, tolerances are in accordance with EN 10029 class A for the thickness and table 4, steel group H for the maximum flatness deviation.