Established in 1975, O’Brien Steel Service is stocked and equipped to service customers of all sizes, ranging from small job shops to the largest OEMs in the USA. Our legacy is rooted in hard work, exceptional service, and long-lasting partnerships with both our customers and suppliers. With the dedication of our 400+ motivated employees, we’re ready to meet your most demanding requirements!

O’Brien Steel operates four service center locations:

• Peoria, IL
• Milwaukee, WI
• Wausau, WI
• St. Louis, MO

In addition, we operate four steel processing locations:

• Lacon, IL – heavy machining, welding, fabrication, and painting
• Minonk, IL – heavy welding, fabrication, and painting
• Congerville, IL – light gauge welding, fabrication, and painting
• Certified Heat Treating – Peoria, IL – commercial thermal processing

Significant dates in our history:

• 1975: Founded in East Peoria, IL by Joe E. O’Brien
• 1978: Moved into the former Hyster plant in Peoria, IL
• 1988: Founded Certified Heat Treating in Peoria, IL
• 2001: Built new oxy-fuel plate burning facility in Peoria, IL
• 2008: Acquired Rohn Products, LLC in Peoria, IL
• 2012: Acquired Wausau Steel in Wausau and Milwaukee, WI
• 2012: Built new long products distribution center in Peoria, IL
• 2016: Acquired Meta Tec in Lacon, IL
• 2020: Acquired Durre Brothers Welding & Machining
• 2020: Acquired Premier Fabrication
• 2023: Acquired Sligo Steel in Madison, IL