The specific temperature at which 1095 steel will harden, also known as the austenitizing temperature, can vary depending on the desired properties and the specific heat treatment process used. However, a common range for austenitizing 1095 steel is typically between 790°C (1450°F) and 815°C (1500°F).

When heating 1095 steel for hardening, it's crucial to reach and maintain the austenitizing temperature to ensure that the steel fully transforms into the austenite phase. The exact temperature within the recommended range may depend on factors such as desired hardness, the specific heat treatment recipe, and the equipment used.

It's important to note that the austenitizing temperature is just one part of the heat treatment process for 1095 steel. After austenitizing, the steel is typically quenched rapidly in a suitable quenching medium, such as oil, water, or brine, to transform the austenite into martensite, which is a hard and brittle phase. The hardened steel is then usually tempered to improve its toughness and reduce brittleness.

To ensure proper heat treatment and achieve the desired hardness and properties with 1095 steel, it's recommended to consult with an experienced metallurgist, heat treatment specialist, or follow established heat treatment guidelines for this specific steel type.