Targeting the rapidly-growing global electric vehicle market, that South KKorean steel maker Hyundai Steel has developed production of 1.5 GPa Martensite Steel sheets with higher flatness and crack-resistance characteristics than ordinary plates. 3 millimeter-thick cold-rolled steel can be used in the production of EV battery cases, bumpers and other reinforcements.Martensite is a very hard form of steel crystalline structure formed in carbon steels by the rapid cooling of the austenite form of iron. Usually, a 1.5 GPa martensitic steel plate is not flat enough and cracks easily due to hydrogen penetration. But Hyundai Steel used a heat technology that replaces rapid cooling normally used when manufacturing the plate, allowing it to be made flatter. It also minimized hydrogen penetration in the process to reduce cracking.Steel sheets used in the production of electric vehicles need to be lighter and stronger to secure the structural integrity of the hull and battery cases. EVs are much heavier than internal combustion engine vehicles of the same class because the weight of battery packs and electric motors combined is heavier than ordinary cars' engine and transmission systems.
Targeting the rapidly-growing global electric vehicle market, that South KKorean steel maker Hyundai Steel has developed production of 1.5 GPa Martensite Steel sheets with higher flatness and crack-resistance characteristics than ordinary plates. 3 millimeter-thick cold-rolled steel can be used in the production of EV battery cases, bumpers and other reinforcements.Martensite is a very hard form of steel crystalline structure formed in carbon steels by the rapid cooling of the austenite form of iron. Usually, a 1.5 GPa martensitic steel plate is not flat enough and cracks easily due to hydrogen penetration. But Hyundai Steel used a heat technology that replaces rapid cooling normally used when manufacturing the plate, allowing it to be made flatter. It also minimized hydrogen penetration in the process to reduce cracking.Steel sheets used in the production of electric vehicles need to be lighter and stronger to secure the structural integrity of the hull and battery cases. EVs are much heavier than internal combustion engine vehicles of the same class because the weight of battery packs and electric motors combined is heavier than ordinary cars' engine and transmission systems.
