ROC 500

Water quenched abrasion resistant plate

Dimensions

Thicknesses (mm) Formats (mm)
6 - 30 2000 × 6000

Chemical composition

Typical values (weight %).

C Si Mn P S Mo Ni Cr B
≤ 0.30 ≤ 0.50 ≤ 1.80 ≤ 0.025 ≤ 0.025 1.00 0.80 0.50 0.005

Mechanical properties in delivery condition

Thickness (mm) Hardness (HB) UTS (MPa) YS (MPa) E (%)
20 500* 1650 1300 8

* Average measured value. Guaranted hardness 450 - 550 HB.

Processing information

Flame cutting

All conventional oxy-gas, plasma and laser methods can be used. Pre-heat plate > 15 mm to 100 - 150 °C.

Shearing and punching

Not recommended, due to the grade's very high strength.

Drilling

Difficult because of the grade's very high hardness. Specials drills with replaceable carbide insert are recommended and drilling will require a very rigid set-up with an abundant flow of cutting fluid.

The following rotations per minute are appropriated:

Ø (mm) rpm
20 720
25 575
30 475
35 410
40 360

Cold bending

Is advisable to use as generous a radius as possible and ensure the plate temperature is above 10 °C. Power requirements are linked to mechanical properties and springback should be allowed for. To avoid crack, the heat affected zone must be clean by grinding. Edges in the bending area must be round top & bottom:

Internal minimum radius V block opening minimum
Transversal 7 × th 14 × th
Longitudinal 9 × th 16 × th

Welding (In accordance with NF: EN 1011)

Weldable using SMAW, GMAW and saw processes. Good joint fit-up and edge preparation are required; edges grind in order to clean heat affected zone, cut defect old trace of paint & moistures.

For SMAW welding use low hydrogen basic coated electrodes. If these have not been correctly stored to prevent moisture absorption, thoroughly re-dry according to manufacturer's recommendations.

Pre-heating is required in all cases.