Round steel bars with code EN43AE01100028 are high-quality alloy steel materials used in the manufacture and refurbishment of critical MAN L21/31 engine components. Thanks to their excellent strength, toughness, and machinability, these bars are ideal for producing precision parts such as shafts, pins, studs, and structural elements. Their stable metallurgical properties ensure consistent performance under high mechanical loads and thermal stress, making them an essential base material for reliable marine and power-generation engine applications.