Mechanical properties analysis of steel tube
Do you know what the mechanical properties of spiral steel pipe are? Let me introduce it to you.
First, the tensile strength (σb): the maximum force (Fb) of the sample during the stretching process, divided by the original cross-sectional area (So) of the sample (σ), called Tensile strength (σb) in N/mm2 (MPa). It shows the maximum ability of metal materials to resist damage under tensile forces. Where: Fb--the maximum force to be taken when the sample is broken, N (Newton), So--the original cross-sectional area of the sample, mm2.
Second, the spiral steel pipe yield point (σs): metal material with a yielding phenomenon, the force of the sample does not increase (maintained constant) during the stretching process, 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 initial drop of the sample. Lower yield point (σsl): The minimum stress in the yield phase when the initial transient effect is not counted. Where: Fs--the yield force (constant) during the tensile process of the specimen, N (Newton) So--the original cross-sectional area of the specimen, mm2.
Third, the elongation of the spiral steel pipe after breaking: (σ) In the tensile test, the percentage of the increase of the gauge length and the length of the original gauge length after the sample is broken 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.
Fourth, the section shortening rate: (ψ) In the tensile test, the maximum reduction of the cross-sectional area of the reduced diameter after the sample is broken and the percentage of the original cross-sectional area, 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.
Fifth, hardness target: The ability of metal materials to resist the impact of hard objects on the surface, called hardness. According to the experimental method and the scope of application, the hardness can be further divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness. Commonly used for pipes are Brinell, Rockwell and Vickers hardness.
Sixth, Brinell hardness (HB): with a certain diameter of the steel ball or carbide ball, with a regular experimental force (F) pressed into the appearance of the style, after the regular time to remove the experimental force, measuring the external pressure of the sample Trace diameter (L). The Brinell hardness value is the quotient obtained by dividing the experimental force by the indented spherical outer surface product. It is indicated by HBS (steel ball) and the unit is N/mm2 (MPa).
First, the tensile strength (σb): the maximum force (Fb) of the sample during the stretching process, divided by the original cross-sectional area (So) of the sample (σ), called Tensile strength (σb) in N/mm2 (MPa). It shows the maximum ability of metal materials to resist damage under tensile forces. Where: Fb--the maximum force to be taken when the sample is broken, N (Newton), So--the original cross-sectional area of the sample, mm2.
Second, the spiral steel pipe yield point (σs): metal material with a yielding phenomenon, the force of the sample does not increase (maintained constant) during the stretching process, 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 initial drop of the sample. Lower yield point (σsl): The minimum stress in the yield phase when the initial transient effect is not counted. Where: Fs--the yield force (constant) during the tensile process of the specimen, N (Newton) So--the original cross-sectional area of the specimen, mm2.
Third, the elongation of the spiral steel pipe after breaking: (σ) In the tensile test, the percentage of the increase of the gauge length and the length of the original gauge length after the sample is broken 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.
Fourth, the section shortening rate: (ψ) In the tensile test, the maximum reduction of the cross-sectional area of the reduced diameter after the sample is broken and the percentage of the original cross-sectional area, 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.
Fifth, hardness target: The ability of metal materials to resist the impact of hard objects on the surface, called hardness. According to the experimental method and the scope of application, the hardness can be further divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness. Commonly used for pipes are Brinell, Rockwell and Vickers hardness.
Sixth, Brinell hardness (HB): with a certain diameter of the steel ball or carbide ball, with a regular experimental force (F) pressed into the appearance of the style, after the regular time to remove the experimental force, measuring the external pressure of the sample Trace diameter (L). The Brinell hardness value is the quotient obtained by dividing the experimental force by the indented spherical outer surface product. It is indicated by HBS (steel ball) and the unit is N/mm2 (MPa).
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