1.Intensity
The ability of square tube materials to resist permanent deformation or fracture under static load. At the same time, it can also be defined as proportional limit, yield strength, fracture strength or ultimate strength.
2.Hardness
The ability of a material surface to resist the intrusion of objects harder than itself.
3. Flexibility
Elasticity refers to a characteristic that allows the material to return to its original size when the external force disappears. Steel is elastic before reaching its elastic limit.
4. Rigidity
The ability to withstand high stress without significant strain. The stiffness is evaluated by measuring the elastic modulus of the material.
5. Brittleness
Refers to a characteristic of square and rectangular tube materials that does not undergo plastic deformation before damage. It is the opposite of toughness and plasticity. Brittle materials have no yield point, but have fracture strength and ultimate strength, and they are almost the same.
6.Plasticity
The ability of square and rectangular tubes to produce permanent deformation without destruction under load. Plastic deformation occurs when a metallic material is stressed beyond its elastic limit and the load is removed, at which point the material retains some or all of the load.
7. Resilience
Toughness refers to the characteristic of square and rectangular tube materials that have certain plastic deformation before fracture under the action of tensile stress.

1. Analysis of characteristic index values of square and rectangular tubes - plastic deformation
Plastic deformation refers to the ability of a metal composite to produce plastic deformation (permanent deformation) without damage under load.
2. Analysis of characteristic index values of square and rectangular tubes-strength
Strength is a gauge that measures the hardness and softness of a metal composite. The most common method of measuring strength in current manufacturing is the indentation strength method, which uses a certain geometric shape of tensile force to press into the surface of the metal composite material being tested under a certain load, and its strength value is measured based on the degree of intrusion.
Common methods include tensile strength (HB), Rockwell hardness (HRA, HRB, HRC) and Brinell hardness (HV).
3. Analysis of characteristic index values of square and rectangular tubes-fatigue
The strength, plastic deformation, and strength discussed above are all indicators of the physical properties of metal materials under static load. In fact, many equipment parts work under cyclic loads. Under such conditions, the parts will cause fatigue.
4. Analysis of characteristic index values of square and rectangular tubes - fracture toughness
The load that acts on a part at a very large speed is called an impact load, and the ability of a metal material to withstand damage under an impact load is called fracture toughness.
5. Analysis of characteristic index values of square and rectangular tubes - compressive strength
Compressive strength refers to the ability of metal composite materials to resist damage (excessive plastic deformation or rupture) under static load. Because the load functions include stretching, shrinking, bending, cutting, etc., the compressive strength is also divided into compressive strength, tensile strength, etc. There is often a certain relationship between various strengths. In use, strength is generally used as the basis of the strength indicator.

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