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RAEX™ 400/500 - Wear Resistant Steel

Technical Data: - Data Sheet (58kb)

Scope
RAEX™ is a high strength and wear resistant steel with favourable hardness and impact toughness. With RAEX you can extend the lifespan of machinery, decrease wear in structural components and save costs. It also enables innovative design and lightweight products improving energy efficiency.

Application
Buckets and containers, cutting edges for earth moving machines, wearing parts for mining machines, wearing parts for concrete mixing plants and wood processing machines, platform structures, feeders and funnels.

Tolerances
Tolerances on dimensions and shapes:

Heavy Plates:

• Thickness EN 10029 Class A.
• Width and length EN 10029.
• Flatness EN 10029, Class N normal tolerances on flatness, steel type H

Cut Lengths:

• Thickness, width, and length EN 10051.
• Flatness EN 10029 Class N, steel type H.

Delivery Condition: The delivery condition of RAEX steel is hardened.

Hardness Values

Materials Testing:
Hardness is measured in Brinell units (HBW) in compliance with EN ISO 6506-1 on a milled surface 0.3-2mm below plate surface. The measurement depth is determined on the basis of product form and plate thickness.

Typical Mechanical Properties

Chemical Composition Content %, maximum (cast analysis)

Typical Carbon Equivalent Values (CEV)

Processing - Wear Resistant Steel.

Despite their high strength RAEX 400 can still be formed by free bending or flanging. However, the bending force, springback effect and the bending radius are greater than those for softer structural steels. When bending or flanging, workshop practices, condition of the tools and exact design must be taken in to consideration. Flangeability can be improved by raising the working temperature to 100°C - 200°C.

Welding & Thermal Cutting
The weldability of RAEX steels has been developed to the top class among wear resistant steels on the market. Practical welding instructions for the RAEX 400 and RAEX 500 grades are presented on the separate technical brochure. Moreover, the brochure specifies the special features regarding thermal cutting of RAEX steels.

Cold Forming
RAEX 400 steels can be cold formed up to the thickness of 20mm. Forming temperature must be a minimum of +20°C and a maximum of +200°C.

Heat-Treatment
Hardened steels are not intended to be heat treated. Tempering in the maximum temperature of 200°C is the only heat treatment which will maintain the abrasion resistant properties of the plate at a good level. Heat treatment in higher temperatures decreases the strength, hardness and abrasion resistance properties of steels.

Drilling
RAEX 400 can be drilled with HSS drills. For drilling of RAEX 500, hard metal drills are recommended. General instructions for drilling of wear resistant steels are:

• The drilling machine has to be rigid and stable in order to minimise vibrations.
• Clamp the work piece securely and close to the area to be machined.
• Short-hole drills (DIN 1897) are recommended.
• The service life of the drilling tool can be prolonged by decreasing the feed.
• Provide an abundant supply of cutting fluid.

Mechanical Cutting
Hardened steels can be cut mechanically. This is, however, challenging because the plate is almost as hard as the cutting blade. High shear force is needed due to the high tensile strength of the steel. High surface pressures during cutting are directed at the blade, which increases wear. The most recommended cutting tool is a straight cutting tool. The most important cutting parameters are blade clearance and blade angle. The hardness of the blade is of great importance. RAEX 400 steels can be cut with heavy duty cutting machines, but the hardness of the cutting blade must exceed 53 HRC. The mechanical cutting of RAEX 500 steel can be recommended only with certain reservations, and then only at thicknesses of less than 10mm and blade hardness over 57 HRC.

Mechanical Cutting of RAEX 400 Steels, guideline values

Occupational Safety
Special care must be taken in all stages of handling hardened steels. Flanging is challenging due to the high strength and high flexural stresses of the plate. If the bending radius, for example, is too small and a crack is created in the bending point, the plate may fly from the bending tool in the direction of the bend.

Those bending the plate must take appropriate precautions to protect themselves and no unauthorised persons must be allowed in the area. The safest location is usually by the bending machine. The handling instructions of the steel supplier and safety instructions of the workshop must be adhered to in detail. New employees must receive appropriate training before they are allowed to process hardened steels.

Inspection Document
An inspection certificate 3.1 in compliance with EN 10204 is granted to RAEX steels. The inspection document states the chemical composition of steel based on cast analysis and hardness in delivery condition.

RAEX™ 400/500 - Wear Resistant Steel

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