Hardox 450

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 with an option for guaranteed impact toughness (Hardox 450 Tuf).

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.

5 reasons to upgrade

1. Longer wear life — and longer uptime
The additional 50 Brinell hardness gained by upgrading to Hardox 450 will increase the wear life. Case studies show that it is possible to achieve up to 50% greater wear life, and even more for some applications.

2. Lower lifetime cost
In these cost-conscious times, you’ll appreciate how longer wear life can lower your maintenance and equipment replacement costs, adding up to total savings.

3. Lower weight
Hardox 450 enables you to use thinner plates in your equipment and components. And thinner plates mean lower weight, more payload and increased profitability. Some of our customers have achieved weight reductions up to 15% after consideration of buckling, deflection and fatigue strength in their designs.

4. Improved dent resistance
Upgrading from Hardox 400 to Hardox 450 improves dent resistance as shown below. In this test, a weight of 300 kg (661 lbs) is dropped from a height of 2.8 m (9.2 ft) onto a test plate 600 x 600 mm (23.6 x 23.6 in).

5. Same tools and machines can be used
In the workshop, you can use the same tools and machines for Hardox 450 as for Hardox 400.

Hardox in the workshop

Hardox 450 is as fabrication friendly as Hardox 400. For example, it can be welded with all conventional arc welding methods intended for welding ordinary and high-strength steels. And all cutting methods — oxy-fuel, plasma, laser and abrasive water jet (AWJ) — can be used. When you upgrade, you can reduce plate thickness by at least 6% if you use the Hardox 400 bending force.

Mechanical Properties

Grade	Thickness (mm)	Hardness ¹⁾ (HBW)	Tesnile strength R_m (MPa), guaranteed	Typical yield strength (MPa), not guaranteed
Hardox 450 CR sheet	0.7 - 2.10	425 - 475²⁾	1370 - 1600	1250
Hardox 450 sheet	2.0 - 8.0	425 - 475	-	1250
Hardox 450 plate	3.2 - 80.0	425 - 475	-	1250
Hardox 450 plate	80.1 - 103.0	410 . 475	-	1250
Hardox 450 plate	103.1 - 130.0	390 . 475	-	1250

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 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. ¹⁾	Transverse test, guaranteed impact energy, Charpy V 10x10 mm test specimen.
Hardox 450 sheet & plate	50 J/-40°C	-
Hardox 450 Tuf ¹⁾	-Min. 27 J/-20°C ²⁾

¹⁾ Impact testing is performed on thicknesses ≥ 6 mm. For thicknesses between 6 - 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.

Tolerances

Tolerances
More details are given in SSAB’s brochure 41-General Product Information Strenx, Hardox®, Armox and Toolox-UK and Hardox® Guarantees or at www.ssab.com.

Thickness
Tolerances according to Hardox Thickness Guarantees. Hardox Guarantees meet the requirements of EN 10 029 Class A for plate. For sheet, the guarantees meet the requirements of 1/2 EN 10 051 and EN 10 131 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 10 029 and EN 10 131 for cold rolled sheet. Tolerances conform to EN 10 051 for sheet, tighter tolerances available on request.

Shape
Tolerances according to EN 10 029 for plate, EN 10 051 for sheet and EN 10 131 for cold rolled sheet.

Flatness
Tolerances are according to Hardox Flatness Guarantees Class D for plate, which are more restrictive than EN 10 029. For sheet, the tolerances are according to Hardox Flatness Guarantees Class A, that offer narrower tolerances compared to EN 10 051. Cold rolled sheet tolerances are according to Hardox® Flatness Guarantees Class B.

Surface Properties
According to EN 10 163-2, Class A Subclass 1.

Bending
Bendability for plate is according to Hardox Bending Guarantees Class E. For sheet, the bendability is according to Hardox Bending Guarantees Class C for cold rolled sheet and Class B for sheet.

Chemical Composition

Chemical Composition (heat analysis)

Grade	C^*) (max %)	Si^*) (max %)	Mn^*) (max %)	P^*) (max %)	S ^*) (max %)	Cr^*) (max %)	Ni^*) (max %)	Mo^*) (max %)	B^*) (max %)
CR sheet	0.18	0.25	1.30	0.015	0.004	0.10	0.10	0.04	0.003
Sheet & plate	0.26	0.70	1.60	0.025	0.010	1.40	1.50	0.60	0.005

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

Carbon Equivalent CET(CEV)

Thickness	CR sheet 0.7 - 2.10	sheet 2.0 - 8.0	plate 3.2 - 4.9	plate 5.0 - 9.9	plate 10.0 - 19.9	plate 20.0 - 39.9	plate 40.0 - 80.0	plate 80.1 - 130.0
Max CET(CEV)	0.33 (0.44)	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)	0.31 (0.39)	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)

Carbon Equivalent CET(CEV)

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 (0.70 - 2.10 mm (0.028 - 0.083")) are supplied as cold rolled surface.

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