1. Plasticity: plasticity refers to the metal material under the action of the load, resulting in plastic deformation (permanent deformation) without breaking the ability.
2. Hardness: hardness is a measure of the degree of hardness of metal materials. The most commonly used in the production of hardness measurement method is the pressure hardness method, it is a certain geometric shape of the indenter under a certain load into the test of stainless steel pipe surface of the metal, according to the degree of penetration to determine the hardness value (commonly used methods are brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and vickers hardness (HV) and other methods.
3. Fatigue: The strength, plasticity, and hardness discussed above are the mechanical properties of the metal under static load. In fact, many machine parts are working under cyclic loading, under which the parts will produce fatigue.
4. Impact toughness: the load acting on the machine at very large speed is called the impact load, and the ability of the metal to resist the damage under the impact load is called the impact toughness.
5. Strength: strength refers to the metal material under static load resistance to damage (excessive plastic deformation or fracture) performance. As the load of the role of stretching, compression, bending, cutting and other forms, so the strength is also pided into tensile strength, compressive strength, bending strength, shear strength. A variety of strength often have a certain connection, the use of more general to the tensile strength as the most basic strength indicators.
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