The tensile test of the square rectangular tube material must first prepare the tensile sample according to the standard, install it in the chuck of the tensile testing machine, and then slowly apply uniaxial tensile stress to the sample until the sample is broken. Through this test, we can judge the following six performances of the rectangular tube:

(1) Scale limit

When tension is applied to the rectangular tube material, there is a stage in which the force and deformation of the metal are linearly proportional, and the maximum ultimate load at this stage divided by the original cross-sectional area of the sample is the proportional limit.

(2) Tensile strength

When the sample is stretched, the stress obtained by dividing the maximum load before breaking by the original cross-sectional area is called the tensile strength. Fracture occurs when a material is subjected to an external stress greater than its tensile strength. Therefore, the higher value, means that it can withstand greater external stress without breaking.

(3) Plasticity

The property that metal materials can undergo permanent deformation before being damaged by force is called plasticity. The plastic index is usually expressed by elongation and reduction of area. The higher the elongation and the reduction of area, the better the plasticity.

(4) Strength

The ability of square rectangular tube material to resist deformation and fracture under the action of external force is called strength. Strength indicators include proportional limit, elastic limit, yield strength, tensile strength, etc.

(5) Elastic limit

When a metal is deformed by an external force, it can completely recover its original shape after the external force is removed. This deformation is called elastic deformation. The maximum stress at which a metal can remain elastically deformed is called the elastic limit.

(6) Yield-to-strength ratio

The yield ratio is the ratio of yield strength to tensile strength. The higher the yield ratio, the higher the strength of the square tube material. The lower the yield ratio, the better the plasticity and the better the stamping formability.