Lead pipes give a cool industrial feel to any build. They are contiguous blocks, meaning that the pipes will rearrange themselves to connect with each other when you place them adjacently.
How to Obtain
Craft them or trade for them.
If you craft lead pipes while standing near a working forge, you'll get twice as much back as normal.
How to Use
Decorative only. They do not actually function as pipes (meaning, you can't use them to run steam), and are not used as an ingredient in any other crafting recipe. Use brass pipe for running steam.