Carbon Steel Bar

 is a refined material used in crafting.

Obtaining
can be smelted by the following crafting stations:

s can be uncommonly dropped by some mechanical monsters like Sentidog T-45s, Sentinels, Shield Sentries, and Patrolcraft T-21s.

can be obtained as a product of recycling any items it is used to craft or any of the following items:

Usage
s are widely used in crafting by themselves as well as for making other important refined materials like Steel Frames.

Mission
can be used during the course of the following missions:
 * Six are needed to repair the Bassanio Lift
 * Ten are needed to complete A Regrettable Deal mission

Commission
is occasionally requested on the Commissions Board in a Rank B commission.

Worktable
is a required ingredient when crafting the following items:

Assembly Station
is a required ingredient when crafting the following items:

Grinder
is a required ingredient when crafting the following items:

Cutter
is a required ingredient when crafting the following items: