Press hardening heats steel blanks and forms them in cooled dies, creating ultra‑strong martensitic parts. Using alloyed steels and cooled tooling, the process enables lightweight, crash‑resistant automotive components like pillars, bumpers, and door rings.
Press hardening, also known as hot forming, is a thermo‑mechanical process used to manufacture ultra‑high‑strength steel components with complex geometries. Steel blanks or cold formed shapes—typically made of manganese–boron alloys such as 22MnB5—are heated to around 900–950°C, transforming the microstructure into austenite. The hot blank is transferred into a water‑cooled die set, where forming and quenching occur in a single step(direct process). The indirect process uses a cold formed preform which is adequately heated. Rapid cooling inside the closed tooling converts the austenite into martensite, achieving strengths above 1500 MPa and keeps the shape to close tolerances. Typical tooling is made of a wide range of Hot Work and Cold Work Tool Steels or even HSS, depending on the actual load conditions and process details. Tooling is designed with integrated cooling channels, high‑temperature inserts, and durable coatings to withstand thermal cycling and maintain dimensional precision. Process control includes furnace heating, transfer time, forming speed, and die temperature. Press‑hardened components are widely used in automotive safety structures such as A‑ and B‑pillars, bumper beams, door rings, and roof rails, enabling lightweight designs with superior crash performance and high energy absorption.