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High Strength Steel for Automotive Applications

ULTRALUME® Press Hardenable Steel (PHS) is an aluminized Type 1, heat-treatable, boron steel intended for automotive steel applications where high strength (approaching 1500 MPa), design flexibility and collision protection are paramount. The hot stamping technology is used for A- and B-pillar reinforcements, roof rails, side-wall members, bumpers, beams and other crash management components. The hot stamping process addresses the forming and springback issues experienced in conventional cold forming in higher strength steels.

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Product Applications

Market

Automotive Body and Structure

ULTRALUME® PHS is ideal for structural automotive steel applications.

Explore Automotive Body and Structure
automotive
Explore Automotive Body and Structure

Available Grades

Uncoated Full Hard PHS

Uncoated Annealed PHS

Product Details

Benefits and Advantages

Blanks produced from ULTRALUME PHS are heated in a furnace at 900 – 950 °C to bring the steel into the austenitic temperature range. The blank is then transferred to a hot forming press where the hot steel is formed into complex shapes. The steel cools rapidly inside the water-cooled dies and undergoes a phase transformation from austenite to a high strength phase – martensite. This rapid cooling, or quenching, increases the tensile strength of the steel from approximately 600 up to 1500 MPa. Since the steel is held in the dies during cooling, thermo-distortion and springback are avoided.

  • Cost-effective
  • Higher strength
  • Flexible, complex designs
  • Weight reductions

Coating

ULTRALUME PHS is continuously hot dip coated on both sides of the steel. The aluminum coating bath contains approximately 91% aluminum and 9% silicon. The metallic coating is metallurgically bonded to the steel substrate and protects the steel surface against decarburization and oxidation during hot stamping. As a result, the shot blasting operation required for hot-stamped, uncoated steel parts is eliminated.

Weldability

Typical automotive welding processes such as resistance spot welding and gas metal arc (MIG) welding can be used for joining of hot-stamped ULTRALUME PHS. The composition, combined with the high strength and martensitic microstructure of the steel after hot stamping, requires weld process development and joint evaluation.

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