Channel steel can be used in high - temperature environments to a certain extent, but its performance will be affected. When the temperature rises, the strength and hardness of channel steel will decrease. However, if it is made of heat - resistant steel or undergoes special heat - resistant treatment, it can be used in relatively high - temperature conditions. For example, in some industrial furnaces or power plants, heat - resistant channel steel can be used for constructing support structures. But continuous exposure to extremely high temperatures without proper protection will eventually lead to failure of the channel steel.