Hardox 400, 450, 500, 550, 600 Wear Resistant Steel

Hardox Wear Resistant Steel

Hardox wear plate has been manufactured by the Swedish steel group SSAB since 1970. Hardox is designed for a long service life with high performance at the same time.

Hardox steel is the unique combination of uniform and high hardness, high strength and very good toughness and is ideally suited for the production of buckets, blades and grippers. 

Different material grades and dimensions allow you to fine-tune to your specific application and requirements.

The numeric digits on Hardox grade represents in hardness. E.g., Hardox 400 has a hardness of 400HBW, Hardox 450 has hardness of 450 HBW and so on.

Hardox 400

Hardox 400 is a wear-resistant sheet with a hardness of approximately 400HBW. Hardox 400 is intended for all applications where high demands on wear resistance are required with good cold bending properties at the same time. Hardox 400 is having excellent weldable.

Read more: Hardox Welding Guide.

Chemical compositions of Hardox 400 are given in the below table:

C%Si%Mn%P%S%Cr%Ni%Mo%B
0.18- 0.260.25- 1.601.30- 1.600.015- 0.0250.004-0.0100.10- 1.400.10- 1.500.04- 0.600.003 -0.004

Hardox 450

Hardox 450 is a wear-resistant steel with a hardness of 450HBW. Hardox 450 is easy to bend and weld. Hardox 450has better buckling and abrasion resistance and a longer service life than Hardox 400.

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The chemical compositions of Hardox 450 steel are given below.

C%Si%Mn%P%S%Cr%Ni%Mo%B
0.18- 0.260.25- 0.701.30- 1.600.015- 0.0250.004-0.0100.10- 1.400.10- 1.500.04- 0.600.003 -0.004

Hardox 500

Hardox 500 is a wear-resistant sheet with a nominal hardness of 500HBW, for applications with high demands on wear resistance. Hardox 500 can be bent and welded. From Hardox 500 we manufacture screens, conveyor buckets, cutting edges, conveyor systems.

C%Si%Mn%P%S%Cr%Ni%Mo%B
0.27- 0.300.50- 0.701.30- 1.600.015- 0.0250.004-0.0101.20- 1.500.25- 1.500.25- 0.600.003 -0.005

Hardox 500 can be bend and is weldable, abrasion-resistant steel with a nominal hardness of 500 HBW. It is suitable for applications where high wear resistance is required.

Hardox 550

Hardox 550 is a wear-resistant sheet with a hardness of approx. 550 HBW and the toughness of Hardox 500. Hardox 550 was developed to ensure an extended service life without compromising crack resistance.

C%Si%Mn%P%S %Cr %Ni%Mo%B %
0.440.501.300.0200.0101.401.400.600.004
Note: Values are maximum permitted.

Hardox 600

Hardox 600 is a wear-resistant sheet with a hardness of approx. 600HBW and a uniquely high notched impact strength.

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This makes Hardox 600 particularly suitable for extreme wear conditions and can still be cut and welded.

Chemical composition of Hardox 600 are given in the below table.

C%Si%Mn%P%S %Cr %Ni%Mo%B %
0.470.701.500.0150.0101.202.500.700.0045
Note: Values are maximum permitted.
Hardox 600 is an extra-hard and tough wear steel for extreme Wear conditions.

Welding of Hardox 400, 450, 500, 550 and 600

Low alloy or carbon steel base welding consumables having a maximum yield strength of MPa (72 ksi) are generally recommended for Hardox 400, 450, 500, 550 and 600.

Higher strength welding filler materials (having a maximum yield strength of 900 MPa (130 ksi) can be used for Hardox 400 and 450 in the thickness range of 0.7 – 6.0 mm (0.028″ – 0.236″).

Low-alloy welding rods lead to higher hardness of the weld metal, which can reduce the wear of the weld metal. If the wear properties of the weld metal are significant, the top edge of the weld could be welded with hard facing welding consumables.

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Hardox 400, 450, 500, 550 and 600 can be welded with stick welding (SMAW) TIG, MIG and other conventional arc welding processes.

welding hardox 500 steel

The carbon equivalent of Hardox 400, 450, 500, 550 and 600 steel is within the range of 0.35- 0.85.

Welding electrodes for Hardox 400, 450, 500, 550 and 600 steel are listed in the below table:

Welding ProcessDIN EN ISO classification
MIG WeldingER70S-6/ ER70S-2
FCAWE71T-1C,
Metal Cored weldingE70C-Ni2
Stick Welding (SMAW)E7018, E8018-G
TIGER70S-6/ ER70S-2

Minimize the risk of hydrogen cracking by following these recommendations

  • Preheat the welding surface to the recommended minimum temperature.
  • Measurement of the preheating temperature according to SSAB recommendations.
  • Use processes and filler materials that deliver a maximum of 5ml/100g weld metal.
  • Keep the weld free of impurities such as rust, grease. Oil or frost.
  • Use only recommended classifications welding consumables.
  • Apply a proper welding sequence to minimize residual stress.
  • Avoid root opening size greater than 3 mm (1/8″);

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