CREUSABRO 4800
The wear resistant steel for heavy and exceptional performance, the highest wear resistance in solid plates : 50% of improvement compared to standard wear resistant steel (hardness 500HB) combined with easy processing.

CHEMICAL ANALYSIS (%) 

DESCRIPTION

Wear resistance:
The CREUSABRO concept - excellent ability to work harden and the supplementary contribution of microcarbides. The steel workhardens by the TRIP effect (Transformation Induced by Plasticity).  The combination of these properties give the CREUSABRO 4800 exceptional wear resistance (the highest wear resistance in heavy plates with uniform properties throughout the thickness) around 8 times that of the standard mild steel (A572 G65 grade).  The properties in extreme conditions are 50% superior to standard water quenched steel (hardness 500HB).

Controlled as delivered hardness range:
Minimum 430HB, Typical 470HB.

High toughness and impact resistance:
CHARPY V long at -20^oC  > 40 J/cm²  (23.6 ft-Lbs)
Typical value at -20^oC : 55 J/cm2  (32 ft-Lbs)

Tensile strength - typical values at 20^oC-:
Ultimate tensile     =     1 630 MPa (235KSI)
Yield strength        =     1 250 MPa (180KSI)
Elongation (5d)    =     12%  

APPLICATIONS

CREUSABRO 4800 is intended for applications requiring extreme wear and impact resistance.
-    Quarries, Construction & Earth Moving:
    Blades, outside stiffeners, underteeth pads of loaders and shovels, crushers and mill liner etc.
-   Mines, Coal mines:
    Extracting and loading equipment, hopper liners. Helical gravity conveyors.  Parts of chain-conveyors etc.
-   Cements Plants:  armouring of drier-tubes, buckets, hoppers, clinker cooler outlet shields etc.
-   Iron and steel industry, scrap, recovery, brickworks, agricultural equipment
 

PROCESSING
In spite of its high mechanical properties, CREUSABRO 4800 remains easy to fabricate with standard procedures and equipment.

Cutting
Standard thermal cutting techniques -flame, plasma, laser cutting - can be used without special preheating for thickness up to 40 mm  (plate temperature > 10^oC).  Plates over 40 mm in thick should be preheated to 150^oC to avoid edge cracking.
The newer techniques - plasma and laser - offer important advantages concerning cutting speed, precision, cleanliness, and vastly reduced heat affected zone, as well as reduction in cut width enabling the possibility of direct welding on the cut edges.  All these processes are appropriate for CREUSABRO 4800.

Mechanical shearing and punching are not recommended even for the thinner plates.

Machining
In accordance with standard procedures, with well maintained equipment with sufficient power.

Drilling  with overcarburized cobalt alloyed high speed tools of HSSCO type (examples : type AISI M42) with taper shank, long helical and as short as possible bits.
Lubrication by soluble oils diluted to 20%.
In case of deep or numerous drilling, we recommend the use of drills with tip in tungsten carbide or solid carbide bits (example : type ISO carbide quality K10 or K20), carbide tipped drills with TiN layer is especially suitable.

Milling with carburized, cobalt alloyed high speed tools of HSSCO type (examples AISI type M35).  In order to improve the efficiency and the finishing operations, the choice of tools with carbide tip (example : ISO type P25 for grooving or K10 or K20 for facing) is recommended.  

Forming
CREUSABRO 4800,despite its high mechanical properties, is reasonably formable.  The steel can be hot formed up to 15 mm thick.

Cold forming:
-    Bending :    bending radius Ri > 6T      (T  :  plate thickness)
                          width of the V-bock >  16T
-    Rolling:        inside diameter Di > 40T

General recommendations for cold forming:
Use press or rolls with sufficient power.
Warming of cold plates - less than + 10^oC - to  workshop temperature, removal of stress raisers on the surfaces to be formed, grinding and deburring of edges, forming in several steps with a stop between each operation to facilitate the flow in the metal are recommended.

Hot forming for thickness < 15 mm
in the range of 450/500^oC or better 880/950^oC, without affecting abrasion resistant properties.
 

WELDING
CREUSABRO 4800 is weldable by any standard processes.  For connecting joints weld metal is similar to those used for standard abrasion resistant grades.
   

  Welds subjected to heavy wear are finished by overlaying:
    -    electrodes type SWA A5-5 : E13018 
    -    wire type AWS A 5-28 : ER 120S1 

General recommendations:
Careful drying of electrodes and flux in accordance with producers recommendations.
Combined thickness (determinated by DIN) :
    -    Tc     <    50 mm : no preheating
    -    Tc     >    50 mm pre and post-heating in accordance with the table below:
   

  Stud welding is possible.  It is recommended to use mild steel for the studs.