Hardox 450 sits one step up from Hardox 400 in SSAB's abrasion-resistant plate lineup, quenched and tempered to a nominal Brinell hardness of roughly 450 HBW. That extra hardness translates directly into better resistance to gouging and abrasive wear than the 400 grade, while the alloy design still keeps enough ductility for cold forming, bending, and welding in a typical fabrication shop — it's positioned as a step toward higher wear performance without moving into the more specialized, harder-to-form grades further up the range.

Because it splits the difference between Hardox 400's easy fabricability and the higher-hardness grades' wear performance, Hardox 450 shows up widely in bucket liners, crusher and screening components, dump bodies, and other wear parts that see more aggressive abrasive loading than a general 400-grade application can tolerate, but still need to be shaped and welded into a finished part on the shop floor.

Hardox is a trademarked SSAB product brand, not a designation covered by AISI, DIN, JIS, or other national steel standards. There is no direct international standard equivalent — comparable through-hardened wear plates are marketed by other producers under their own trade names, but chemistry and guaranteed properties are not identical across brands.

At roughly 450 HBW, Hardox 450 is noticeably more abrasive to cutting tools than the 400 grade, let alone mild steel. The uniformly hard, through-quenched-and-tempered microstructure resists the cutting edge the same way it resists abrasive wear in service — there's no soft zone to exploit, so tool wear accumulates steadily rather than in localized hot spots.

Machining this grade calls for the same disciplined approach as the rest of the Hardox family, just dialed back a notch further: rigid setups to minimize deflection, wear-resistant coated carbide grades with strong hot hardness, and cutting speeds reduced from what's used on Hardox 400. As with other Hardox grades, most shop work on this material is thermal cutting, drilling, and edge preparation rather than bulk material removal, since the plate is normally used close to its supplied thickness. Where drilling or boring is required, plan for shorter tool life than on lower-hardness stock and set feeds conservatively to avoid edge chipping.