Cutting and Machining of HARDOX 400 Steel Plate

HARDOX 400 steel plate is known for its excellent wear resistance and high hardness, but these same properties also make cutting and machining more technically demanding. To achieve high-quality results while preserving material performance, manufacturers must apply proper methods and closely control process parameters. Understanding the right cutting and machining techniques ensures stable production and maximizes the steel’s service life.
Thermal cutting, such as oxy-fuel, plasma, and laser cutting, is widely used for HARDOX 400 steel plate. However, the high hardness makes the material more sensitive to excessive heat input. If the heat-affected zone (HAZ) becomes too soft or develops microcracks, wear resistance and mechanical strength may decline. To minimize these risks, operators should use optimized cutting speeds, maintain steady torch height, and avoid overheating the material. Preheating may be recommended for thicker plates to reduce thermal stress and prevent edge cracking.
Cold cutting, including waterjet cutting and mechanical shearing, offers an advantage by avoiding thermal softening. Waterjet cutting delivers extremely clean edges and preserves the plate’s original hardness, making it ideal for precision work. Mechanical shearing is possible for thinner plates, but tool wear must be considered due to the plate’s hardness.
Machining HARDOX 400 steel plate requires robust tooling and careful parameter control. High-quality carbide-tipped tools, lower cutting speeds, and consistent lubrication are essential for maintaining tool life and achieving acceptable surface finish. Rigid machine setups and stable clamping conditions help prevent vibration and edge chipping. Drilling and milling should be performed with reduced feed rates to prevent overheating and tool breakage.
Overall, successful cutting and machining of HARDOX 400 steel plate depend on selecting appropriate methods, controlling heat input, and using high-strength tools. With proper techniques, manufacturers can process HARDOX 400 steel plate efficiently while retaining its superior wear resistance and mechanical performance.