Steel is now crafted through multiple steps to balance its cost with other mods such as Mekanism or Immersive Engineering.
The steps are:
This process requires a basic setup (basically just a vanilla blast furnace) however each steel ingot costs 3 iron ingots and almost 4 coal which is quite more expensive than the process from other mods, not counting crafting time which is a bit long. This gives players a choice between a simpler setup but less efficient and a complex setup but way more efficient in terms of ressource consuming.
Note: this is still subject to changes depending on feedbacks.
Steel is now closer to iron in terms of gear efficiency. Durability is still higher than iron but lower than diamond.
Bitumen now comes in smaller pockets, around sea level. Biomes that are hilly or mountainous do not have bitumen pockets anymore. This should reduce bitumen quantity in the world.
To find bitumen the best way is now looking around rivers or coasts however you can still find pockets in caves near the surface.

A simple library mod that includes all common content shared by my other mods