The phrase "more steel-plated" indicates something that is heavily fortified or protected. Some synonyms for this phrase include "reinforced", "armoured", "fortified", "strengthened" and "hardened". These words all imply a sense of extra strength and resilience, often used in describing physical objects like buildings or vehicles. However, they can also be used to describe a person, indicating someone who is tough or resilient in character. Whether it's a structure, a machine or a person, the phrase "more steel-plated" conveys a sense of toughness and durability, making it a useful expression in conveying strength and resilience.