Dennen Steel Corp - Serving America's Prime Manufacturers for 70 Years

OUR History

Seventy Years as a Steel Service Center and Stamped Parts Manufacturer
After 70 years of organic growth, the foundation of our success is experience and expertise - not merely acquisitions of failed businesses. Our deep steel and manufacturing knowledge, sophisticated and mature processes, and efficient and modern production equipment deliver a unique value to high-volume customers.

In 1947, WW II veteran Cyron Dennen invested his life’s savings to found Dennen Steel Supply Company. Originally a steel brokerage and trading company, it specialized in buying and reselling rail carloads of government war surplus steel and aluminum.

When younger brother Philmore Dennen completed his college studies in 1950, he joined the firm that was then operated from a Quonset hut on Third Street in Grand Rapids, Michigan. The family business began to focus on galvanized sheets, selling mainly to local sheet metal fabricators.

In 1952 the company built a 25,000 square foot facility, which was immediately enlarged to 40,000 square foot to accommodate six shears and 80 employees.

Business was booming and the Dennen brothers saw the growth in slit, coil-fed stamping. To meet new customers’ needs they built a new 57,000 square foot facility in 1968. The new plant housed state-of-the-art slitters, leveling lines, overhead cranes and the industry’s first X-ray gauge measuring system, 50,000 tons of master coil steel inventory, metallurgists, and a larger purchasing and sales staff.

The new facility opened in 1968. In 1973, the company name was changed to Dennen Steel Corp. and plans began to build a new 175,000 facility with immediate interstate highway access.

The Second Generation Takes Over
In 1980, Andrew Dennen joined the company, followed by his brother Peter in1984 and a new business model emerged. All under one roof, Dennen Steel added new slitting equipment and new coil-fed stamping presslines to their steel purchasing and master coil processing work. The result is a continuous, integrated production stream that begins with steel procurement and ends with stamped and assembled parts.

In 2004, the company opened its 35,000 square foot facility in Burns Harbor, IN to support greater Chicago-area and midwest customers.