Hardenability
Hardenability is the ability of a steel to form martensite at greater depth during cooling. The higher the hardenability, the harder and more crack-sensitive the steel becomes.
Physicochemical mechanism of action
Hardenability is a measure of a steel's ability to form martensite at greater depth during cooling. This occurs through rapid cooling and high carbon content distribution in the material.
Metallurgical relevance & risks during welding
Excessive hardenability can lead to crack-sensitive martensitic areas that cause cracks under mechanical loads. This increases the risk of hot cracking and shortens the service life of components.
Workshop practice & instructions for use
To control hardenability, the cooling rate of the steel must be precisely controlled. For hardenable steels (e.g., HSS), ensure a cooling time of at least 10 seconds per cm thickness. Use a controlled cooling stand or a heat exchanger for this.