Just keep in mind that it’s not a hard and fast rule that “rolled armor” was better than “cast armor.”
Each technique has specific advantages and disadvantages. For example, while rolled steel may be “tougher” than a cast steel plate of similar thickness and manufacturing quality, it would be harder to work it into more complex shapes. And armor shape has a great deal of influence on effectiveness of said armor.
Balancing between protection, weight, ease and scale of manufacture, ease of quality control, etc. was always a challenge, and each tank represents a specific selection among all those factors.
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