... ,more strength, hardness, and toughness. 1.Safety 2.Tough 3.Light Alloy steel material introductionAlloy steel is high polymer material that be ... zirconium.The following is a range of improved properties in alloy steels (as compared to carbon steels): strength, hardness, toughness, ... the driver and passenger.Tough. Using new material of alloy plastic steel.Light. 5 mm thickness and max 2.5-3kg,save ...