Metal materials are widely used in modern industry mainly because of their various properties during processing and use. The mechanical properties of metal materials refer to the characteristics of metal materials under the action of external forces. Common mechanical property indicators are: strength, plasticity, hardness, fracture toughness and fatigue strength. Let me lead you to our mechanical property laboratory. Observe the various phenomena of low-carbon steel and cast iron in metal static tensile tests at room temperature, and become familiar with their strength and plasticity indexes under static load. The metal impact test is applied to help students learn about the measurement of impact absorbing energy under impact load.