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Corey has been manufacturing cold finished steel bars for almost six decades. Beginning with a single drawing line, they now have one of the most modern facilities with coil fed continuous drawing lines capable of drawing bars from just over a quarter inch to 2 inches in diameter. They also operate draw benches that can make round bars up to 4 inches, hexagon bars to 3 inches, and squares to 2 inches in diameter.

A cold drawn bar is produced by drawing a hot rolled bar through a die without heating the material, then shearing it to a desired length and straightening it to commercial tolerances. The resulting product meets exacting tolerances for concentricity, diameter, straightness, length, and surface finish. These tolerances vary depending on the size and chemistry of the material ordered. ASTM A108 sets tolerances and guidelines for different sizes and grades of the product.

In-line and Off-line Magnetic Testing of Cold Drawn Steel Bars

Corey can test bars magnetically for surface defects. Commonly called eddy current testing, this test looks for surface defects at a prescribed depth by creating a magnetic field which is broken and measurable by surface defects. Corey can perform this test both during the drawing process and off line if needed.

Turned/Ground/Polished Steel Bars

While cold drawing is the most widely used method of making cold finished steel bars, the same or better attributes can be achieved by turning or grinding the material. The turning process can begin with either a hot rolled or cold drawn bar while a ground bar uses a cold drawn bar as feed stock. Depending upon the application of the finished product, many different combinations of diameter tolerances can be achieved.

Corey has both a turning center and a grinding facility giving the company the complete combination of processes necessary to produce a cold finished steel bar meeting our customers' requirements