The Need

Modern diesel and high‑performance internal combustion engines demand pistons that withstand extreme thermal and mechanical loads while becoming lighter, more fuel‑efficient, and lower cost to manufacture. Steel pistons offer durability advantages over aluminum but are traditionally heavy and expensive due to extensive machining, especially when forming internal cooling galleries. Current manufacturing routes waste large amounts of material, increase cycle time, and limit design flexibility, creating a strong need for more efficient, scalable, and cost‑effective steel piston manufacturing approaches.

The Technology

OSU engineers have developed technology that enables near‑net‑shape manufacturing of one‑piece steel pistons with integrated cooling galleries formed primarily through controlled hot forming rather than extensive machining. The approach leverages tailored thermal‑mechanical processing to relocate material internally, creating complex piston features while preserving mass. By emphasizing metal movement instead of removal, the process significantly improves material utilization and manufacturing efficiency, while remaining compatible with existing forging and finishing workflows used in the piston and automotive supply chain.

Commercial Applications

• Heavy‑duty and medium‑duty diesel engine pistons
• High‑performance automotive and commercial vehicle engines
• Off‑highway, marine, and stationary power generation engines
• Next‑generation steel pistons for downsized or boosted engines

Benefits/Advantages

• Improved material yield: Dramatically reduces steel waste compared to machining‑intensive processes
• Lower manufacturing cost: Fewer processing steps and reduced machining time
• Lightweight yet durable: Maintains steel’s high‑temperature strength at lower mass
• Design flexibility: Enables advanced piston geometries to support higher engine efficiency and performance