Water quenched wear-resistant steel
DILLIDUR 500 V is a wear resistant steel fine grain treated at average hardness of 500 HB in delivery condition whose mechanical properties are obtained by water quenching.
The production range of the DILLIDUR 500 V plates is 8 mm (¹∕³ in) to 100 mm (4 in), other sizes possible on request.
|Thicknesses (mm)||Formats (mm)|
|10 - 50||2000 × 6000|
Typical values (weight %).
|≤ 0.30||≤ 1.60||≤ 0.50||≤ 0.010||≤ 0.025|
Depending on thickness, the following alloying elements are used singly or in combination for controlling of full hardening:
|≤ 0.50||≤ 1.00||≤ 1.50||≤ 0.08||≤ 0.05||≤ 0.005|
The steel is fully killed and fine-grain treated.
Typical values for the carbon equivalent:
|Thickness (mm)||≤ 30||30 - 70||70 - 100|
*C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15
Mechanical properties in delivery conditions
|Hardness (HB)||UTS (MPa)||YS (MPa)||KCVL -20°C (J)**||E (%)|
* average, 470 ‑ 530 HB for plate thickness ≤ 30 mm and 450 ‑ 530 HB for thicker plates. Hardness tested per heat each 40 t.
** 20 mm thickness.
Comply with the EN 10029 European standards with class A for the thickness.
DILLIDUR 500 V plates can be drilled with High Speed Steel (HSS) drill - more precisely cobalt alloy HSS drill, which have a satisfactory service life if the cutting speed and the drill advance are properly accomodated. Hard metal drills are not required. For grinding and cutting
In spite of its high degree of hardness the steel can be cold formed. Attention should be paid to the fact that with increasing yield strength the required forces for the forming operation also grow, even if the plate thickness remains unchanged. The spring back will also increase. Grinding of the flame cut or sheared edges in the bending area is recomended to avoid crack initiation.
The steel obtains its hardness by accelerated cooling from the austenitizing temperature: After hot forming the same hardness is only obtained if the steel is quenched again after forming. It has to be expeeted, that the hardness achieved through such a treatment differs from that measured in the delivery condition, because the cooling capacity avaible during production of the plate differs from that avaible in the fabricator’s works.
Hot forming and heat treatment
This steel can be heated up to a temperature of 200 °C without appreciable loss of its hardness and without the need for a new heat treatment. Upon request we can provide the variation of the mechanical characteristics in relation to varying temperatures. Special attention must be paid at temperatures between 300 °C and 450 °C as these temperature could reduce very much the toughness at room temperature.
Flame cutting & welding
The instructions given in the technical sheet SEW 088 and in the CECA information bulletin n° 2 can be applied, considering the similarity, however taking into consideration the high values of resistance and temperability. For flame cutting, the following minimum preheating temperatures should be observed: 75 °C for plate thicknesses from 25 up to 70 mm. and 125 °C for thicker plates. For manual are welding basic coated rods, having a very low residual moisture should be used. If necessary, drying according to the instruction of manufacturer should be carried out.
Additionally the following recomendations are to be considered:
- Generally up to a thickness of 15 mm (0.6 in) the steel can welded without preheating. In order to eliminate the risk of cracking in the welded joint, in cases of high rigidity of structure a preheating temperature of 140 - 190 °C is generally recommended for thicknesses > 15 mm. (0.6 in). A preheating over 200 °C must be avoided, because it would bring a decrease of the hardness (see diagram).
- Weld fillers should be as soft as loading conditions of the construction, and wear and tear of the weld will allow.