Docol® 355HE high edge ductility

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    General Product Description

    The Docol HR355Y430T HE steel is the next generation of hot-rolled high-strength low-alloy steels with improved local formability for higher edge ductility and cut-edge quality.

    Docol HR355Y430T HE have a new and closely controlled production method resulting in a very fine microstructure in combination with a very clean steel, resulting in greatly improved local formability while still retaining a good global formability making it suitable for stamping most geometries and will excel in demanding forming where the cut edges may limit the forming operation.

    The improved cut edge quality achieved with this new way of producing Docol HR355Y430T HE with a steel less sensitive to tool-settings and –wear compared to conventional HSLA grades, make it especially suitable for fine blanking.

    Combining the improved local formability with the excellent cut-edge quality Docol HR355Y430T HE will have a typical hole expansion of approx. 30 percentage points above the corresponding conventional HSLA grade.

    Also the bending performance is improved and a bend radius of 0xt can be guaranteed.

    Docol HR355Y430T HE will excel when optimizing any fine blanking, stamping or forming operation and will push the limit on how to utilize the benefits of steel.

    Docol HR355Y430T HE can after agreement be adapted and delivered as dual certified with S355MC according to EN 10149-2.

    Dimension Range

    Docol HR355Y430T HE is available as Hot-rolled pickled and oiled coil, slit coils and cut to length sheets in thickness of 2.00*) - 7.00 mm and widths up to 1600 mm. Length up to 16 meters.

    *Some restrictioins may occur, and will be handled on request.

    Mechanical Properties

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      Coating Yield strength Rp0.2
      (min MPa)
      Tensile strength Rm
      (MPa)
      Elongation A80 1)
      (min %)
      Elongation A5 2)
      (min %)
      Hole expansion ratio
      (% typical)
      Min. inner bending radius for a 90° bend
      Docol HR355Y430T HE UC 355 430 - 540 19 23 110 0.0 x t
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      Comparison

        The mechanical properties are valid in the longitudinal direction.

        Bending properties for both longitudinal and transversal direction.

        1) A80 value applies for thicknesses < 3.00 mm.

        2) A5 value applies for thicknesses ≥ 3.00 mm.

        Chemical Composition (ladle analysis)

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          C
          (max %)
          Si
          (max %)
          Mn
          (max %)
          P
          (max %)
          S
          (max %)
          Altot
          (min %)
          Nb
          (max %)
          V
          (max %)
          Ti
          (max %)
          Docol HR355Y430T HE 0.10 0.03 1) 1.50 0.025 0.010 0.015 0.09 2) 0.20 2) 0.15 2)
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          Comparison

            The steel is grain refined.

            1) Meets the requirements of category A (thin coatings) for hot-dip zinc-coating in EN 10149-2.

            2) The sum of Nb, V and Ti is max 0.22%.

            Tolerances

            Hot-rolled (UC): Tolerances in accordance to EN 10051.

            Customized dimensional and shape tolerances are available on request.

            Fabrication and Other Recommendations

            For information concerning fabrication, see SSAB´s brochures on www.ssab.com or consult Tech Support.

            Appropriate health and safety precautions must be taken when bending, welding, cutting, grinding or otherwise working on the products.

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