1.2343 is a popular tool steel grade known by various names such as AISI H11, DIN 1.2343, or X37CrMoV5-1. It is a versatile and widely used steel that offers excellent properties for a variety of tooling applications. 1.2343 is a chromium-molybdenum-vanadium alloyed steel, which contributes to its exceptional toughness, heat resistance, and wear resistance. These properties make it well-suited for applications that involve high-temperature environments, such as hot-work tools, die-casting dies, forging dies, and extrusion tools.