carry a guaranteed hardness range of 370\u2013430 HBW, with tensile strength reaching 1,250 MPa and yield strength above 1,000 MPa in standard plate thicknesses from 4mm to 130mm.<\/span><\/p>\nThe Hardox 400 plate chemical composition limits carbon to 0.32% maximum (at 6\u201320mm thickness), which keeps the carbon equivalent low enough for welding without mandatory preheat in most thicknesses below 25mm a practical advantage that most generic wear plate grades at 400 HBW do not provide. Charpy V-notch impact values reach 45 J at \u221240\u00b0C, which matters in mining and quarrying applications running through cold-weather seasons. Hardox material at the 400 grade occupies the middle position in the Hardox family more abrasion-resistant than Hardox 350 and easier to fabricate than Hardox 450 or 500.<\/span><\/p>\n