CREUSABRO ® 4800

Easier to transform, harder in service

CREUSABRO ® 4800 ℗ is a high performance wear resistant steel exhibiting on average a wear resistance 40 - 45 % higher than conventional 400 HB water quenched steel in optimised conditions (sufficient impact or pressure).

CREUSABRO ® 4800 ℗ offers the best possible balance between exceptional wear resistance and improved workability. Application markets of CREUSABRO ® 4800 ℗ are: mining, quarrying, cement industry, steel production, public works…

Dimensions

Thicknesses (mm) Formats (mm)
3 - 5 1500 × 3000
6 - 25 2500 × 6000

Chemical composition

Typical values (weight %).

C Mn Ni Cr Mo S P
≤ 0.20 ≤ 1.60 ∼ 0.20 ≤ 1.90 ≤ 0.40 ≤ 0.005 ≤ 0.018

Mechanical properties in delivery conditions

Hardness (HB) UTS (MPa) YS (MPa) A (%) KCVL -20°C (J) Elasticity modulus (GPa)
370* 1200 900 12 ≥ 40 205

* Hardness: 340 - 400 HB (at delivery condition).

Metallurgical concept

Abrasion resistance is not exclusively connected to the hardness of the steel in its as delivered condition. Its composition and structure strongly influence the actual performance in service. The Chemical composition and manufacturing processes applied to CREUSABRO ® 4800 ℗ develop a metallurgical structure, which contributes strongly to the improvement of its wear resistance through the following effects.

CREUSABRO ® 4800 ℗ originality is to be delivered at an intentionnal limited hardness in order to bring to subcontracter and manufacturer an easier way to work with. Bending in easier conditions (limited power requested), rolling in easier way (once again limited power requested), machining easier due to homogeneous micro-structure.

Processing information

Drilling

Can be done with high speed tools, HSSCO type. (ex. AR.2.9.1.8 according to AFNOR, M42 according to AWS). Lubrification with soluble oil diluted to 20 %.

Cold bending

Can be done without any problem when the following conditions are met:

  • no mark or scratches in shaped zones, mainly on extrados face;
  • bevelling by grinding of edge angle specially on extended skin;
  • eventually grinding to remove cutting slight defects;
  • minimum internal bending radius (table below);
  • plate temperature > 10 °C.
Internal minimum radius V block opening minimum
Transversal 3 × th 12 × th
Longitudinal 4 × th 12 × th

The strength necessary to bend depends on UTS and plate thickness as well as length bend and die opening V.

Thickness (mm / in) Bending strength (t/m)
5 (0.20) 70
10 (0.39) 130
20 (0.78) 250

Flame cutting

All the classical flame cutting processes can be used: oxygas, plasma, laser. whatever the flame cutting process used, the following conditions are good enough to avoid any risk of cold cracking.

Products temperature Thickness ≤ 60 mm Thickness > 60 mm
≥ 10 °C Without preheating Preheating: 150 °C
< 10 °C Preheating: 150 °C Preheating: 150 °C

Rolling

Has to be done using the following conditions: Ø ≥ 30 x th (temperature of the piece ≥ 10 °C.) Power necessary to roll a plate will be about double than a S355 type steel.

Milling

Shall be done with HSSCO tools (AR.6.5.2.5. according to AFNOR, M35 according to AISI or AFNOR AR.12.0.5.5 / AISI T15).

Welding

CREUSABRO ® 4800 ℗ can be welded by all traditional welding processes: manual, semiautomatic under gas, automatic under fluxes. For welds non exposed to wear, the following welding rods can be used.

Allow for a tight bending angle to compensate spring back effect.

For weld bead exposed to wear, please ask for advice on the choice of welding products and processes and parameters. Welded area must be free of grease, water, oxides… Electrodes and flux shall be dried according to supplier recommendations. The following preheating conditions shall be met (weld without excessive stresses).