400HB Wear Resistant Steel – Dillidur 400 V

Dillidur 400HB penstock for a hydroelectric project

Dillidur 400HB penstock for a hydroelectric project. Copyright Dillinger Hutte

We stock Dillidur 400V (400HB) abrasion resistant steel plate.  This is a wear resistant steel that when delivered has an average hardness of 400HB on the Brinell Scale. Dillidur 400HB plates is a brand of Dillinger Hutte and is equivalent to other AR400 steels including Abrazo, Fora and Hardox

400HB steel is primarily used by customers whose projects, applications and machinery require improved resistance to wear, together with good workability and especially good weldability. Typical examples of use are earth moving, loading machines and other yellow goods dredgers, skip cars, conveyors and plants processing mineral and aggregate products, trucks, cutting edges, knives and breakers, waste elimination and recycling plants. It can also be used to provide ballistic resistance for military and light armoured vehicles under some circumstances. It is mainly used in the mining sector

These uses are possible because the properties of the water quenched martensitic steel has both high hardness and high yield strength. It has a wear resistance of about 3 times that on S355 plates to EN10025-2 allowing the thickness to be reduced and thus the overall weight of the equipment – providing significant fuel savings during the plants life cycle.  Compared to many other wear resistant steel plates Dillidur 400HB has good weldability and good forming properties.

Dillidur 400HB can be offered from new rolling at thicknesses between 6 mm and 150 mm. On an ex-stock basis it is available from 8 mm to 150 mm

400HB Plate Availability

Typical plate widths are 2 m and 3 m but we also have a number of narrower plates and also at the 2.5 m level. Plate lengths are typically at 12 m for the thinner plates and this shortens as plate thickness increases. There is a wide range of plate sizes and choices allowing us to fulfill most RFQ directly from stock.

Typical CEV values at 25 mm are 0.46 rising to 0.64 at 120 mm [CEV = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15]

For 20 mm thick 400HB abrasion resistant plate typical values are:

  • Tensile strength – 1200 MPa (175 ksi)
  • Yield point – 800 MPa (116 ksi)
  • Elongation – 12 % (lo = 5.65√So)

400HB Steel Plate Testing

Dillidur 400HB plates are impact tested (Charpy-V notch Test) to 30J at -40°C. Brinell hardness testing is done on a per heat basis and on every 40 metric tonnes within the heat.

Cold Forming of 400HB Plate

Despite the high hardness and strength of Dillidur 400HB steel plate the plates can be cold formed. As the yield strength increases the force required for the forming also increase even if the plate thickness remains unchanged. Additionally the spring back also increase.

In order to manage the risk of cracks forming from the edges AR400 plates that are flame cut or sheared should be ground prior to cold forming. It is also a good idea to round the plates edges slightly on the outside edge of the plate that is being formed.

 Hot forming of 400HB plate

Hot forming generally is not recommended as the steel gets its hardness from the accelerated cooling undertaken after rolling at the mill. If the plates are hot formed then it is very likely that the quenching process used after forming to recover the hardness will be different, leading to substantial differences in performance. However plates can be heated to about 250 °C without the hardness being substantially affected. The impact of tempering is shown in the diagram below

 

Dillidur 400HB Change in values with tempering temperature

Dillidur 400HB Change in values with tempering temperature

We also stock 450HB and 500HB dillidur wear resistant steel plates.

For customers in Europe 400HB plate can be ordered direct from Dillinger or from stock from AncoferWaldram.