24 July 2021 Wear Resistance Steel Sheet
Quard 500 Wear Resistance Steel Sheet
QUARD500 is Belgian wear-resistant steelgrade, which is a product with a tensile strength of 1650 N/mm2 (240 ksi) and a yield point of 1300 N/mm2 (190 ksi). QUARD500 is a water-quenched wear-resistant steel with an average hardness of 500 HBW after delivery. Its mechanical properties are obtained by quenching.
QUARD500 has been successfully applied in high-wear environments, and it also has excellent machinability, especially welding performance. Application examples include: loaders, excavators, dump trucks, conveyor equipment, trucks, knife-edge and breaking tools, waste cleaning and recycling equipment, etc.
QUARD500 is available in thicknesses from 8mm (1/3 inch) to 100mm (4 inches), please refer to the supply outline for details. Other size requirements can be discussed separately. The molten steel is fully sedated and processed for fine graining. Delivery status: temperature controlled water quenching
Mechanical properties:
The room temperature hardness of steel plate below 30mm (including 30mm) is 470-530 HBW, and above 30mm is 450-530 HBW.
Tensile test of transverse specimen at room temperature (typical value of 20MM (0.8 inch) thick steel plate):
Tensile strength: 1650 N/mm2 (240 ksi)
Yield point: 1300 N/mm2 (190 ksi)
Elongation: 8% (1o=5.65√So)
Longitudinal specimen V-notch impact test (typical value of 20MM (0.8 inch) thick steel plate):
Toughness: -20°C (-4°F), 25J (18 ft⋅lbf)
Transverse specimen bending test (typical value of 30MM (1.2 inch) thick steel plate):
Formability:
Bending core radius>=3.0x sample thickness, bending angle 180°
The surface Brinell hardness is tested once per furnace (40t).
Steel plate identification:
The logo includes at least: ·Factory trademark·Steel type (QUARD500) ·Heat number·Plate number
The words QUARD500 are printed on the steel plate.
Processing performance:
Whether you can use this steel plate to process reliable products depends fundamentally on the entire processing technology and the technology used in the processing. During processing, it should be ensured that the calculation, design and processing methods all meet the requirements of the material itself, meet the requirements of the latest processing technology, and meet the requirements of the actual use of the product in the future. Customers should choose the applicable materials by themselves and refer to the recommendations of Stahl-Eisen-Werkstoffblatt 088 or EN 1011 while considering high strength and hardenability.
Cold forming:
Despite its high hardness, QUARD500 can still be cold formed. However, it should be noted that as the yield strength increases, the required deformation and resilience of the steel plate of the same thickness will also increase. It is recommended to polish the flame cut or cut edges of the cold bending area to prevent cracking.
Thermoforming:
This steel grade obtains hardness through accelerated cooling from the austenitizing temperature. After hot forming, the hardness can only be restored by re-quenching. It is foreseeable that the hardness obtained by re-quenching will be different from the hardness measured at the factory. This is because the quenching equipment used in the production of steel plates and the quenching equipment owned by the processing plant are different in capacity. The hardness of the steel plate heated to about 200°C (390°F) will not decrease significantly (it can reach 250°C for a short time).
Flame cutting and welding:
Flame cutting should follow the following minimum preheating temperature: plate thickness below 30mm, 50°C (125°F); plate thickness 30~70mm, 100°C (215°F); above 70mm, 180°C (360°F) .
Manual arc welding should use alkaline coated electrodes with low residual moisture (if necessary, dry treatment should be carried out according to the requirements of the electrode manufacturer).
In addition, the following suggestions should also be considered:
In order to prevent weld cracking when the structural rigidity is high, it is generally recommended to adopt a preheating temperature of 150~200°C (305~395°F) for thick steel plates above 8 mm (0.6 inches). Preheating above 200°C (390°F) must be avoided because it will reduce the hardness.
The weld filler should be as soft as possible within the allowable range of structural load and weld wear.
Machining QUARD500 can use high-speed steel drills, especially cobalt alloy high-speed steel drills. If the appropriate drilling speed and drilling speed are used, the drill bit can obtain a satisfactory service life.