Below is a list of Nickel Bar manufacturers from Northbrook, Illinois. Nickel bars are straight, solid products of nickel or nickel alloys that have the capability of being extruded. Nickel bars can come in a variety of shapes: circular, triangular, square, and more. Nickel bars are among the wide range of products that can be formed from nickel, whose alloys can withstand extreme temperatures and be welded, machined, and hot and cold worked.