H13 (1.2344) is a tough, versatile, chromium-molybdenum air-hardening, hot-work tool steel. It has good red-hardness, so is used more than any other tool steel for hot-work applications. Tools can be water cooled without a risk of thermal fatigue cracking, which occurs because of cyclic heating and cooling cycles in hot work tooling applications. H13 can also be used in cold work applications. Excellent “polishability”.
H13 is particularly suitable for hot forming tools, where resistance to heat checking is key. Also extrusion tools, forging dies, pressure casting tools, hot shear knives, tools for the plastics industry. Also hot chisels, pressure pads, extrusion stems and rams, blanking and bending tools, hot heading tools, backer blocks.