High protection HBW 550 steel - Quardian 550
Quardian 550 is a protection plate steel, which combines excellent properties in ballistic resistance with high strength and an average hardness of 550 HBW.
Quardian 550 is mainly recommended for the following applications:
• armoured limousines
• patrol vehicles
• valuable transporters
• protected buildings
• secured containers
• armoured personnel carriers
The selection of the material is up to the purchaser.
NLMK Clabecq supplies this product in the following range:
Quardian 550 is delivered as quenched and tempered.
HBW = 530 - 580
Note: Brinell hardness test, HBW according to EN ISO 6506-1, is performed 1 - 2 mm below the plate surface once per heat treatment individual.
Other mechanical properties (minimum values)
- Charpy V Impact toughness according to EN 10045-1 o 14J (longitudinal at -40 °C)
- Yield Strength (MPa) 1200
- Tensile properties (MPa) 1660-2200
Note: Average of 3 tests. Single value min 70% of specified average. Thickness <12 mm sub
sized Charpy V specimen have been used.