ROC 400

Abrasion resistant sheet

Wear resistant sheet, hot rolled on strip mill mechanical properties are obtained during the rolling process. Thanks to the rolling process sheets have an excellent surface cleanliness.

Dimensions

Thicknesses (mm) Formats (mm)
5 - 25 1500 × 6000
5 - 60 2000 × 6000

Chemical composition

Typical values (weight %).

C Si Mn S P Cr Ni Mo B Nb
≤ 0.24 ≤ 0.70 ≤ 1.80 ≤ 0.015 ≤ 0.03 ≤ 1.50 ≤ 0.80 ≤ 0.50 ≤ 0.005 ≤ 0.05

Mechanical properties in delivery condition

Thickness (mm) Hardness (HB) UTS (MPa) YS (MPa) E (%)
15 400* 1300 1000 12

* Average measured value. Guaranted hardness 370 - 440 HB.

Dimension tolerance

In accordance with EN 10051 (December 1997).

Processing information

Flame cutting

All conventional oxy‑gas, plasma and laser methods can be used. Preheating temepratures linked to thickness:

  • 30 ‑ 50 mm: 75 °C;
  • 50 mm: 100 °C.

Drilling

8 % cobalt high speed steel drills (grade M42) which have a slow helix, a short flute length, a thick webb and a point thinned angle of 130° are recommended. A very rigid set-up is essential with an abundant flow of cutting fluid. The work-piece should preferably be securely clamped to a mild steel backing plate and positioned close to the drill post. The following rotations per minute / feeds are appropriated:

Ø (mm) feed (mm/rev) rpm
5 0.05 570
10 0.10 290
15 0.16 190
20 0.20 150
30 0.30 90

Cold bending

In order to optimize this operation, a minimum temperature of 10 °C is requested.

Internal minimum radius V block opening minimum
Transversal 4 × th 12 × th
Longitudinal 5 × th 14 × th

Hot forming

This grade is not suitable for hot forming. Heating above 200 °C reduces the mechanical properties.

Welding (In accordance with NF: EN 1011)

Readily weldable under normal conditions using SMAW, GMAW and SAW without pre-heat, up to combined thickness of 60 mm, provided low hydrogen controlled electrodes are used. All welding consumables should be dried. Welding can be successfully carried out using heat inputs in the range of 1.5 - 3 kJ / mm. The interpass temperature should not exceed 150 °C. the following minimum preheat temperature should be observed 75 °C for plate thicknesses from 30 up to 50 - 100 °C.