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Hardox® 450

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    General Product Description

    The most popular abrasion-resistant steel with excellent structural properties.

    Hardox® 450 is an abrasion-resistant steel with a nominal hardness of 450 HBW. Hardox® 450 combines good bendability and weldability. The products can be used in many different components and structures that are subject to wear. Hardox® 450, with an extra 50 Brinell hardness over our 400 grade, provides better dent and abrasion resistance as well as longer wear life, so you can achieve even greater savings.

    Dimension Range

    Hardox® 450 is available in thicknesses of 3.2 - 130 mm (1/8 - 5.12") as plate, as sheet in thicknesses 2.0 - 8.0 mm (0.079 - 0.315") and as CR sheet in thicknesses 0.8 - 2.1 mm (0.031 - 0.083"). For thicknesses over 80 mm (3.15") the preferred width is 1650 mm (64.96"). More detailed information on dimensions is provided in the dimension program.

    Mechanical Properties

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      Product Thickness
      (mmin)      		 Hardness 1)
      (HBW)      		 Tensile strength Rm
      (MPaksi), guaranteed      		 Typical yield strength
      (MPaksi), not guaranteed
      Hardox® 450 CR sheet 0.8 - 2.100.031 - 0.083 425 - 475 2) 1370 - 1600199 - 232 1250181
      Hardox® 450 sheet 2.0 - 8.00.079 - 0.315 425 - 475 — 1250181
      Hardox® 450 plate 3.2 - 80.00.126 - 3.150 425 - 475 — 1250181
      Hardox® 450 plate 80.1 - 103.03.154 - 4.055 410 - 475 — 1250181
      Hardox® 450 plate 103.1 - 130.04.059 - 5.118 390 - 475 — 1250181
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        1) Brinell hardness, HBW, according to EN ISO 6506-1, on a milled surface 0.5 – 3 mm below surface. At least one test specimen per heat and 40 tons.

        2) Hardness test is not performed or guaranteed for Hardox® 450 cold rolled material. The hardness interval is a conversion from the tensile strength.

        The nominal thickness of supplied plates will not deviate more than +/- 15 mm from the thickness of the test specimen used for hardness testing.

        Hardox® wear plate is through-hardened. Minimum core hardness is 90 % of the guaranteed minimum surface hardness.

        Impact Properties

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          Product Longitudinal test, typical impact energy,
          Charpy V 10x10 mm test specimen          		 Min impact energy for transversal testing,
          Charpy V 10x10 mm test specimen 1)
          Hardox® 450 sheet & plate 50 J / -40 °C37 ft-lbs / -40 °F —
          Hardox® 450 Tuf — 27 J / -20 °C 2)20 ft-lbs / -4 °F 2)
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            1) Impact testing is performed on thicknesses ≥ 6 mm for plate and ≥ 3 mm for sheet. For thicknesses between 3 and 11.9 mm, sub-size Charpy V-specimens are used. The specified minimum value is proportional to the cross-sectional area of the test specimen, compared to a full-size specimen (10 x 10 mm). Impact testing according to ISO EN 148 per heat and thickness group. Average of three tests

            2) Single value minimum 70% of specified average.

            Chemical Composition (heat analysis)

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              Product type C *)
              (max %)              		 Si *)
              (max %)              		 Mn*)
              (max %)              		 P
              (max %)              		 S
              (max %)              		 Cr*)
              (max %)              		 Ni*)
              (max %)              		 Mo*)
              (max %)              		 B*)
              (max %)
              CR sheet 0.19 0.30 1.50 0.020 0.005 0.10 0.10 0.05 0.004
              Sheet & plate 0.26 0.70 1.60 0.025 0.010 1.40 1.50 0.60 0.005
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                The steel is grain refined. *) Intentional alloying elements.

                Carbon Equivalent CET(CEV)

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                  Product type CR sheet Sheet Plate Plate Plate Plate Plate Plate
                  Thickness (mmin) 0.8 - 2.100.031 - 0.083 2.0 - 8.00.79 - 0.315 3.2 - 4.90.126 - 0.193 5.0 - 9.90.197 - 0.390 10.0 - 19.90.394 - 0.783 20.0 - 39.90.787 - 1.571 40.0 - 80.01.575 - 3.150 80.1 - 130.03.154 - 5.118
                  Max CET(CEV) 0.36 (0.49) 0.35 (0.48) 0.37 (0.48) 0.38 (0.49) 0.39 (0.52) 0.41 (0.60) 0.43 (0.74) 0.41 (0.67)
                  Typ CET(CEV) 0.32 (0.41) 0.26 (0.39) 0.29 (0.39) 0.33 (0.45) 0.36 (0.48) 0.38 (0.56) 0.38 (0.61) 0.39 (0.64)
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                    CET and CEV formula

                    Tolerances

                    More details are given in SSAB’s brochure Hardox® Guarantees.

                    Thickness

                    Tolerances according to Hardox® Thickness Guarantees. Hardox® Guarantees meet the requirements of EN 10029 Class A for plate. For sheet, the guarantees meet the requirements of 1/2 EN 10051 and EN 10131 for cold rolled sheet products.

                    Length and Width

                    According to SSAB’s dimension program. For plate, the tolerances are according to SSAB´s mill edge standard or tolerances that conform to EN 10029 and EN 10131 for cold rolled sheet. Tolerances conform to EN 10051 for sheet, tighter tolerances available on request.

                    Shape

                    Tolerances according to EN 10029 for plate, EN 10051 for sheet and EN 10131 for cold rolled sheet

                    Flatness

                    Tolerances are according to Hardox Flatness® Guarantees Class D for plate, which are more restrictive than EN 10029. For sheet, the tolerances are according to Hardox® Flatness Guarantees Class A, that offer narrower tolerances compared to EN 10051. Cold rolled sheet tolerances are according to Hardox® Flatness Guarantees Class B.

                    Surface Properties

                    According to EN 10163-2 Class A, Subclass 1.

                    Delivery Conditions

                    The delivery condition is Q or QT (Quenched or Quenched and Tempered). Hardox® 450 plates are delivered with sheared or thermally cut edges, and thicknesses over 80 mm are delivered with mill edge as standard. Hardox® 450 sheets are delivered with an as-rolled surface and mill edge as standard. Hardox® 450 cold rolled sheets (0.80 - 2.10 mm (0.031 - 0.083")) are supplied as cold rolled surface. 

                    Delivery requirements can be found in SSAB’s brochure Hardox® Guarantees or www.ssab.com.

                    Fabrication and Other Recommendations

                    Welding, bending and machining

                    Recommendations can be found in SSABs brochures at www.hardox.com or consult Tech Support.

                    Bendability for plate are according to Hardox® Bending Guarantees Class F. For sheet, the bendability are according to Hardox® Bending Guarantees Class C for cold rolled sheets, and Class B for sheet.

                    Hardox® 450 and Hardox® 450 Tuf are not intended for further heat treatment. Mechanical properties are achieved by quenching and when necessary, by means of subsequent tempering. The properties of the delivery condition cannot be retained after exposure to temperatures in excess of 250 oC (482 oF).

                    Appropriate health and safety precautions must be taken when welding, cutting, grinding or otherwise working on this product. Grinding, especially of primer coated plates, may produce dust with a high particle concentration.