Arntzen Corporation manufactures large diameter rolled and welded steel casing pipe with mills in Rockford and Woodstock, Illinois used by underground contractors for road boring, pipe ramming, auger boring, caissons, and drilled shafts. Other uses related to trenchless construction are directional drilling, micro-tunneling, and airshafts. Arntzen Corporation operates pipe mills in Rockford, IL and Woodstock, IL with 200,000 square ft under roof and 35 acres of additional outdoor storage. Our range of products are used by underground contractors for road boring, pipe ramming, auger boring, caissons and drilled shafts. We manufacture steel pipe from various steel grades to the exact diameters, thickness and lengths that your project requires.