Straight joint steel tube structural design features

　　Straight joint steel tube structural design features

　　1. Tensile strength (σb): The maximum force (Fb) received by the sample during the stretching process, divided by the original cross-sectional area (So) of the sample (σ), is called Tensile strength (σb) in N/mm2 (MPa). It shows the maximum ability of metal data to resist damage under tensile effects. Where: Fb - the maximum force accepted when the sample is broken, N (Newton); So - the original cross-sectional area of the sample, mm2.

　　2. The yield point (σs): metal data with the phenomenon of yielding, the force of the sample during the stretching process is not added (maintained stable), the stress can continue to stretch, called the yield point. If the force attack declines, the upper and lower yield points should be distinguished. The unit of the yield point is N/mm2 (MPa). Upper yield point (σsu): the maximum stress before the sample is bent and the force is first lowered; the lower yield point (σsl): the minimum stress in the yielding stage when the initial transient effect is not counted. Where: Fs--the yield force (stable) during the tensile process of the specimen, N (Newton) So--the original cross-sectional area of the specimen, mm2.

　　3. Elongation after break: (σ) In the tensile test, the percentage of the length added by the gauge length after the sample is broken and the length of the original gauge length is called the elongation. Indicated by σ, the unit is %. Where: L1--the length of the gauge length after the sample is broken, mm; L0--the original gauge length of the sample, mm.

　　4. Section shortening rate: (ψ) In the tensile test, the percentage of the maximum reduction of the cross-sectional area of the reduced diameter after the sample is broken and the original cross-sectional area is called the section shortening rate. Indicated by ψ, the unit is %. Where: S0--the original cross-sectional area of the sample, mm2; S1--the minimum cross-sectional area at the reduced diameter after the sample is broken, mm2.

　　5. Hardness target: metal data against the ability of hard objects to collapse the appearance of the appearance, called hardness. According to the experimental method and the scope of application, the hardness can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness. There are three types of commonly used pipes, such as Brinell, Rockwell and Vickers hardness.

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