In the passenger car sector, to meet increasingly stringent fuel consumption regulations, engine downsizing and turbocharging have become trends. The rise in in-cylinder combustion pressure poses new challenges to piston materials. Although aluminum alloy pistons dominate, the share of steel pistons is gradually increasing.

　　Compared to aluminum alloy, steel has a higher density but exhibits a lower thermal expansion coefficient and higher high-temperature strength. This means that when designing steel pistons, the clearance between the piston head and cylinder can be reduced, thereby minimizing piston knock noise and oil consumption. The latest research indicates that steel pistons can withstand burst pressures exceeding 20MPa, a performance unattainable by traditional aluminum pistons. In hybrid vehicles, where engines frequently start and stop with significant temperature fluctuations, steel pistons are increasingly favored due to their superior dimensional stability.

　　Jiaozuo Max Power Technology Co., Ltd