I heat treat knives and pull them out at around 1900F to cool the knives.

The kiln should be allowed to cool to room temperature before removing the glass, pottery, or low-fire ceramics. Some materials such as copper enameling and high carbon tool steels, however, are normally removed at high temperatures. The sudden change in temperature should not adversely affect the copper enameling or the steel. The kiln's firebricks and elements can also withstand the rapid temperature change.