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Hardox 550

At 550 HBW and with a toughness close to Hardox 500

Hardox 550, with a nominal hardness of 550 HBW and toughness close to Hardox 500, increases wear life but not at the expense of crack integrity.

Hardox 550
Mechanical Properties
Hardness 1) (HBW)
8.0 - 65.0 525 - 575

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.

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 is through-hardened. Minimum core hardness is 90 % of the guaranteed minimum surface hardness.

Impact Properties

Grade Longitudinal test, typical impact energy, Charpy V 10x10 mm test specimen.
Hardox 550 30J / -40°C

More details are given in SSAB´s brochure 41-General product information Strenx, Hardox, Armox and Toolox-UK and Hardox Guarantees or on

Tolerances according to Hardox Thickness Guarantees. Hardox® Guarantees meets the requirements of EN 10 029 Class A but offers more narrow tolerances.

Length and Width
According to SSAB´s dimensions program. Tolerances according to SSAB´s mill edge standards or tolerances that conform to EN 10 029.

Tolerance according to EN 10 029.

Tolerances according to Hardox Flatness Guarantee class E, which are more restrictive than EN 10 029 Class N.

Surface Properties
EN 10163-2 Class A Subclass 1.

Chemical Composition

Chemical Composition (heat analysis)

C *)
(max %)
Si *)
(max %)
Mn *)
(max %)
P *)
(max %)
S *)
(max %)
Cr *)
(max %)
Ni *)
(max %)
Mo *)
(max %)
(max %)
0.44 0.50 1.30 0.020 0.010 1.40 1.40 0.60 0.004

The steel is grain refined. *) Intentional alloying elements.

Carbon Equivalent CET(CEV)

Thickness 8 - 31.9 32 - 51 51.1 - 65
Max CET(CEV) 0.49(0.70 0.52(0.75) 0.61(0.82)
Typ CET(CEV) 0.46(0.67) 0.49(0.72) 0.58(0.79)

Carbon Equivalent CET(CEV)

Delivery Conditions

The delivery condition is Q or QT (Quenched or Quenched and Tempered). The plates are delivered with sheared or thermally cut edges. Untrimmed mill edges available by agreement.

Delivery requirements can be found in SSAB´s brochure 41-General product information Strenx, Hardox®, Armox and Toolox-UK or at

Tech Support

Documents to download

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