1： What are the physical properties of metals ？

Answer ： Including density 、 Melting point 、 Thermal expansion 、 Conductivity and thermal conductivity 。

2： What is called Melting point ？

Answer ： Is the temperature at which a metal changes from a solid to a liquid 。

3： What is the chemical properties of metals ？

Answer ： It refers to the ability of metal materials to resist the corrosion of surrounding chemical media at room temperature or high temperature 。

4： What are the chemical properties ？

Answer ： Including oxidation resistance and corrosion resistance 。

5： What is antioxidant ？

Answer ： The ability to resist oxidation at room or high temperature 。

6： What is corrosion resistance ？

Answer ： Resistance to corrosion of water vapor and other substances at high temperature 。

7： What is mechanical property ？

Answer ： Refers to the ability of metal materials to resist external forces 。

8： What are the mechanical properties ？

Answer ： Including strength 、 Hardness 、 Plasticity 、 Toughness 、 Fatigue strength, etc 。

9： What is deformation ？

Answer ： Refers to the change of shape and size of metal materials under the action of external force 。

10： What kinds of metal deformation can be divided into ？

Answer ： It can be divided into stretching 、 Compress 、 Bend 、 Twist and cut 。

11： What is elastic limit ？

Answer ： It refers to the maximum force that the material can bear in the elastic stage 。

12： What is yield strength ？

Answer ： It refers to the maximum stress that the material can bear when yielding occurs 。

13： What is tensile strength ？

Answer ： It refers to the maximum stress that the material can bear before breaking 。

14： What is called Plasticity ？

Answer ： It refers to the property that the material is easy to deform without fracture 。

15： What is called Material Hardness ？

Answer ： The ability of a material to resist other objects pressing into its surface 。

16： Hardness How to express ？

Answer ： Brucelli Hardness 、 Rockwell Hardness 、 Vivtorinox Hardness 。

17： What is the technological performance of metal materials ？

Answer ： It refers to whether the performance of metal materials is easy to be processed and formed 。

18： What are the technological properties of metals ？

Answer ： Including castability 、 Weldability 、 Forging property 、 Machinability and heat treatment 。

19： What is alloy steel ？

Answer ： A steel in which some alloying elements are intentionally added to improve the mechanical properties of the steel on the basis of carbon steel 。

20： What kinds of alloy steel can be divided into ？

Answer ： It can be divided into alloy structural steel 、 Alloy tool steel 、 Special purpose steel 。

21： What is cast iron ？

Answer ： Carbon content greater than 2.11％ It's called cast iron 。

22： What kinds of cast iron can be divided into ？

Answer ： White cast iron 、 Gray cast iron 、 Ductile iron 、 Alloy cast iron 、 Malleable iron

23： What are the simple identification methods of iron and steel ？

Answer ： Spark identification 、 Fracture identification 、 Color mark identification 。

24： What is the structure of the alloy ？

Answer ： Solid solution 、 Metal compound 、 Mechanical mixture 。

25： What are the types of aluminum alloy ？

Answer ： It can be divided into deformed aluminum alloy and cast aluminum alloy 。

26： What are the copper alloys ？

Answer ： Can be divided into bronze 、 Red copper 、 Brass 。