Quality Certificates Erie Campus, Michigan Certifications IATF 16949 – Heidtman Steel Products & Heidtman Tubular ISO 14001 – Heidtman Steel Products ISO 9001 – Heidtman Tubular Butler, Indiana Certifications IATF 16949 ISO 14001 ISO 9001 Granite City, Illinois Certifications IATF 16949 ISO 14001 East Chicago, Indiana Certifications IATF 16949
