Plate
The last stage on the anvil. Machines are built from it, and four pressed together make a block of hull.
The workhorse part. Generators, heaters, battery docks, cargo modules and most of the later stations are built from plate. How many one ingot gives depends on the ore: inert ores (low Combustion) give 5, volatile ones only 2.
Plate is a part, not a building block. Press four of them into Metal Hull to build with.