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Glass Door Lock
Oct 31, 2018

Glass Door Lock

Metal material trait

1. Plasticity

Plasticity refers to the ability of a metal material to produce permanent deformation (plastic 

deformation) without being damaged by the external force of the load. When the metal material is 

stretched, the length and the cross-sectional area are changed. Therefore, the plasticity of the 

metal can be measured by the elongation of the length (elongation) and the shrinkage of the 

section (sectional shrinkage).


The greater the elongation and the reduction of the section of the metal material, the better the 

plasticity of the material, that is, the material can withstand large plastic deformation without 

damage. Generally, a metal material having an elongation of more than 5 percent is called a plastic 

material (such as low carbon steel), and a metal material having an elongation of less than 5 

percent is called a brittle material (such as gray cast iron). The plastic material has good plastic 

deformation in a large macroscopic range, and the plastic material is strengthened by plastic 

deformation while plastic deformation, thereby improving the strength of the material and 

ensuring the safe use of the parts. In addition, plastically good materials can be smoothly 

processed in certain molding processes, such as stamping, cold bending, cold drawing, and 

straightening. Therefore, when selecting a metal material as a mechanical part, it is necessary to 

satisfy a certain plasticity index.


2. Durability

The main form of building metal erosion:

(1) Average erosion. The erosion of the metal surface makes the section thinner on average. 

Therefore, the annual average thickness impairment value is commonly used as an indicator of 

erosion function (erosion rate). Steel generally has an average erosion in the atmosphere.


(2) Pitting corrosion. Metal erosion is spotted and forms deep pits. The generation of pitting 

corrosion is related to the nature of the metal and the medium in which it is located. Pitting 

corrosion is prone to occur in media containing chloride salts. The maximum hole depth of pitting 

corrosion is often used as an indicator. Pipe erosion is often considered for pitting problems.


(3) Galvanic erosion. The contact of different metals, due to the different potentials of the erosion.


(4) Crevice erosion. Metallic surfaces often occur in cracks or other concealed areas due to 

localized erosion caused by differences in the composition and concentration of the medium 

between different parts.


(5) Stress erosion. Under the combined action of the erosive medium and the high tensile stress, 

the metal surface is eroded and spreads inward into microcracks, often causing sudden breakage. 

This damage may occur in high-strength steel bars (steel wires) in concrete.


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    Tel: +86-757-85619957
    Fax: +86-757-85619955

    Email: hyh5@china-hyh.com


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