AISI H13

Thermal Toughness

Alloying elements like chromium and molybdenum give this steel group its distinct thermal properties. In aisi h13, these elements form stable carbides that block grain growth at high processing temperatures. This chromium-molybdenum chemistry enables the tool steel to withstand rapid heating and cooling cycles without losing its structural strength.

Hardening Practice

Austenitizing at high temperatures followed by air or pressurized nitrogen quenching hardens the material to its working state. Tool steel of the aisi h13 grade is typically tempered three times to achieve a hardness of forty-six to fifty-two Rockwell C. This tempering step transforms retained austenite into martensite, which prevents sudden fracturing under the high pressures of injection molding. The heat treatment also minimizes dimensional changes, ensuring that tightly toleranced mold components fit together perfectly throughout thousands of production runs.

Surface Damage

Surface degradation occurs when molten resins flow over mold gates and thin walls under high pressures and velocities. Using aisi h13 allows molders to apply nitride or vapor deposition coatings that prevent gate wash and abrasive wear. These treatments create a hard surface shell while the core remains tough and resistant to impact.