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火灾现场中的金属材料在高温的作用下，能发生一系列的物理或化学变化，残留下不同特征的痕迹物证，这些痕迹物证的特征能表示出该金属的受热温度的高低和受热时间的长短，还能证明开关状态和起火点的位置等。由于一般金属材料在火灾现场中形成的痕迹物证不能被火彻底烧毁，所
Metallic materials in the fire scene can undergo a series of physical or chemical changes under the action of high temperature, leaving traces of different signs of evidence. The characteristics of these signs can show the temperature of the metal being heated and the length of the heating time , But also to prove the switch status and the location of fire and so on. As a result of the general metal materials in the scene of the fire signs can not be completely destroyed by the fire