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DENT-RESISTANT STEEL
U. S. Steel's dent-resistant products are specially designed to deliver the benefits of lightweighting with increased resilience against dents resulting from daily wear and tear.
Ongoing weight reduction efforts have driven a steady decrease in the thickness and mass of automotive components in recent years. That’s why U. S. Steel has developed new grades of steel to resist the tendency of thin-gauge exposed panels to permanently dent, the result of anything from a hail storm to stones thrown off a construction vehicle, an errant baseball throw to an out-of-control shopping cart.
Dent-resistant steels from U. S. Steel offer a combination of formability and high yield strength that is not attainable with low-carbon, mild steels or conventional high-strength steels—these are advanced, bake-hardenable steels designed to have the formability requirements needed in most exterior applications.
DENT-RESISTANT STEEL PRODUCT
FEATURES
A bake-hardenable steel is any steel with the capacity for a significant increase in strength through the combination of work hardening during part formation and strain aging during a subsequent thermal cycle such as a paint-baking operation.
A combination of relatively low yield strength prior to manufacturing and high in-part strength after forming and paint baking makes bake-hardenable steels ideal for applications where dent and palm printing resistance is important. This material can be used in relatively complex deep draw or stretching operations. High in-part strength also makes bake-hardenable parts good candidates for downgauging to reduce weight.
In bake-hardenable steel, the amount of strain introduced during the forming process will largely dictate the final strength of the part. Since automotive parts—specifically exposed body panels—have a wide array of designs, there will be a corresponding disparity in the amount of strain introduced in these varying geometries. As a result, when using bake-hardenable steel, it’s important to design an adequate amount of strain into a part in order to fully utilize this material’s dent-resistant characteristics.
APPLICATIONS
- Doors
- Deck Lids
- Quarter Panels
- Fenders
- Hoods
- Roofs
TYPICAL PROPERTIES FOR BH 180 MPa
PRODUCT | YIELD STRENGTH | TENSILE STRENGTH | TOTAL ELONGATION (%) | N-VALUE |
---|---|---|---|---|
Cold Rolled | 195 | 325 | 39 | 0.21 |
EG | 195 | 325 | 39 | 0.21 |
HDGI | 185 | 305 | 39 | 0.21 |
HDGA | 185 | 305 | 39 | 0.21 |
TYPICAL PROPERTIES FOR BH 210 MPa
PRODUCT | YIELD STRENGTH | TENSILE STRENGTH | TOTAL ELONGATION (%) | N-VALUE |
---|---|---|---|---|
Cold Rolled | 225 | 345 | 39 | 0.20 |
EG | 225 | 345 | 38 | 0.20 |
HDGI | 230 | 355 | 34 | 0.19 |
HDGA | 230 | 355 | 34 | 0.19 |
TYPICAL PROPERTIES FOR BH 240 MPa
PRODUCT | YIELD STRENGTH | TENSILE STRENGTH | TOTAL ELONGATION (%) | N-VALUE |
---|---|---|---|---|
Cold Rolled | 256 | 378 | 35 | 0.19 |
EG | 256 | 378 | 35 | 0.19 |
HDGI | 250 | 370 | 36 | 0.20 |
INCREASE IN YIELD STRENGTH DURING FORMING AND BAKING
DENT-RESISTANT STEEL APPLICATIONS
SUPPORTING AUTOMOTIVE
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