Tailor-welded blanks

  • 10-Feb-2009 10:27 EST

With its first application in a production car, ThyssenKrupp Steel’s hot-stamped tailor-welded blanks are used in the Audi A5 coupe and the new A4’s B-pillars’ rear-side members and tunnel reinforcements. This technology is used mainly in the production of crash-relevant components. In addition to rear and front members, typical applications are bumpers or roof rail reinforcements. With the hot stamping process, a manganese-boron-alloy steel designed specially for the process is first heated to 880 to 950°C (1616 to 1742°F) in a furnace, then stamped into a component, and cooled very quickly in the die at a rate of more than 30 K/s (54 R/s). The high blank temperature during stamping ensures forming behavior, and the subsequent rapid cooling results in an extremely hard microstructure in the material. This produces a tensile strength of around 1500 MPa (217,560 lb/in2).

For more information, visit booth 1155 at the SAE 2009 World Congress.
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