- Tanks had armour plating made from rolled homogeneous armour (RHA).
- RHA was a steel consisting of 0.25-0.35% carbon, <1% manganese, <0.5% silicon and <0.025% phosphorus and sulphur.
Main Armament
- The guns were made from steel forged around a steel tube.
- The barrels themselves were made from a hardened steel liner pressed into a softer carbon steel tube.
Engine and Transmission
- Blocks and heads were cast iron
- Crankshafts were forged steel.
- Gearbox housings were cast steel or cast iron.
Road wheels and suspension
- The road wheels were made from cast steel.
- Track pins and bushes were made from alloy steel.
- Leaf spring suspension used carbon or alloy steels.
Tracks
- The base plates of the track links were pressed steel.
- The track pins and bushes were made of alloy steel.
