SSAB Hardox 450

Identity and supplied form

SSAB's supplement 2067en (2023) guarantees 1390–1560 MPa measured tensile strength Rm for Hardox 450 sheet at 2.0–2.49 mm and 450 CR sheet at 0.8–2.10 mm. The 425–475 HBW entry is typical hardness converted from tensile strength. 1250 MPa yield is also typical. SSAB thin-sheet supplement 2067en

Hardox 450 is SSAB's wear steel with nominal hardness 450 HBW. The product designation belongs with the producer, supplied form and thickness; a generic “AR450” description does not establish Hardox provenance. SSAB Hardox 450 product page

A useful selection starts with the wear system: abrasive material, particle size, sliding or impact motion, support, attachment and replacement criterion. Specify the finished part's structural and dimensional requirements separately. Hardness is a material selection input, not a prediction of life in an unspecified duty, and it does not authorize reducing a liner or bucket panel's thickness without reassessing the design.

Thickness-dependent hardness

SSAB lists the following product ranges and hardness intervals. Its 1250 MPa yield-strength figure is typical and explicitly not guaranteed. SSAB mechanical-property table

*Below 2.5 mm, direct hardness testing is neither performed nor guaranteed; the tabulated hardness is converted from tensile strength. SSAB table footnote

The available SSAB Zero version has its own 4.0–25.4 mm plate availability range. Confirm the ordered production route and applicable documentation rather than treating all catalog dimensions as available in every variant. SSAB dimension range and variant footnote

Thin-sheet acceptance

SSAB's formal thin-sheet supplement lists 1390–1560 MPa tensile strength Rm for Hardox 450 CR sheet at 0.8–2.10 mm and Hardox 450 sheet at 2.0–2.49 mm. The associated 425–475 HBW and 1250 MPa yield strength are typical, nonguaranteed values. Tensile strength is measured and guaranteed; hardness uses a material-specific conversion. SSAB data sheet 2067en, 2023-09-27

Illustrative acceptance check: assume a correctly identified 2.0 mm Hardox 450 sheet test report gives Rm = 1480 MPa. It falls within the stated 1390–1560 MPa interval. That arithmetic does not certify the complete delivery, establish a yield load, or supply a hardness result for each finished component. The actual test report, sampling and order requirements still govern acceptance.

Resolve any extra direct-hardness requirement with the supplier before purchasing thin material. Do not substitute a generic hardness conversion table or transfer the method to an unidentified wear steel.

Impact and thermal scope

SSAB reports a typical longitudinal Charpy-V value of 50 J at −40°C for 20 mm material, referenced to a 10 × 10 mm specimen. Testing is by agreement; 3–11.9 mm material uses subsize specimens, with the stated energy proportional to specimen cross-sectional area. SSAB impact table and footnotes

The product is not intended for further heat treatment. SSAB states that delivery-condition properties cannot be retained after exposure above 250°C. This is not a guarantee of acceptable loaded service at every temperature below that value. SSAB fabrication recommendations

Account for cutting, welding, straightening, coating cure and service excursions. Assess the fabricated region separately from the unaffected incoming material when local heating changes the condition on which the original properties depend.

Dimensions and forming

Hardox Guarantees V5 (2026) distinguishes sheet, CR sheet and plate tolerances. For plate thicker than 80 mm, its thickness-tolerance range follows EN 10029 Class A rather than the narrower range described for thinner plate. Inspect against the applicable product and thickness row, not a general promise of tight tolerances. SSAB guarantees, p. 4

For Hardox 450 plate, bending class E specifies minimum punch-radius/thickness ratios transverse/along rolling direction of 3.0/3.5 below 8 mm, 3.5/4.5 at 8–<20 mm, and 4.5/5.0 at ≥20 mm; corresponding minimum die-opening/thickness ratios are 12, 14 and 16. These guarantees use roll dies, normal friction without lubrication, and a one-step bend to 90° after unloading. Sheet and CR sheet use separate classes. SSAB guarantees, p. 8

Check bend orientation, edge condition and tooling before transferring a listed ratio.

Welding and release

SSAB's Welding of Hardox wear plate V5 (2024) addresses preparation, consumables, preheat/interpass temperature, heat input and weld sequence. It calls for ≤5 ml hydrogen per 100 g weld metal with unalloyed or low-alloyed consumables. Excessive heat input broadens the heat-affected zone and impairs its mechanical and wear properties. SSAB welding guide, pp. 4–6, 18

Use the guide's actual grade, joint and thickness conditions when developing the procedure. Do not select a universal preheat from the trade name, or treat the incoming plate's hardness as a guaranteed weld-metal property. Specify inspection and acceptance for the completed joint as well as for the base material.

For ordering and release, retain producer identity, form, thickness, material documentation and traceability through cutting. Record approved fabrication requirements, relevant thermal history and final inspection results. For a substitution, compare the complete duty and evidence: matching a nominal hardness number does not establish matching formability, toughness or performance in service.

Source versions

The thin-sheet supplement prints 2023-09-27. The welding guide prints 103-en, V5-2024; the guarantees guide prints 155-EN, V5-2026. The live product page has no technical revision date used here. Sources reviewed 2026-11-01, America/Los_Angeles; URL timestamps are not treated as document editions.

See Grades, conditions and material selection.