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Explanation of mechanical properties of steel tubes and plates
Dec 20, 2018

(1) . It represents the maximum resistance of a metal material to damage under tension. Fb-- the maximum force sustained when the sample was pulled apart, N (Newton); So-- the original cross-sectional area of the sample, mm2.

(2) yield point (sigma s) : for a metal material with yield phenomenon, the stress in which the force in the drawing process does not increase (stays constant) but continues to extend is called the yield point. If the force drops, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa). (10) top yield point (sigma su) : the maximum stress before the first drop of yield force in a sample. Sigma sl: the minimum stress in the yield phase when the initial instantaneous effect is not considered. Where: Fs-- yield force (constant) in the tensile process of the sample, N (Newton) So-- original cross-sectional area of the sample, mm2.

In a tensile test, the percentage of the length added to the standard distance of a sample after it has been pulled and the length of the original standard distance is called the elongation. In sigma, the units are %. Where: L1-- the standard distance length after the specimen is broken, mm; L0-- length of the original standard distance of the sample, mm.

In a tensile test, the percentage of the maximum reduction in the cross sectional area at the reduced diameter after a specimen is pulled down relative to the original cross sectional area is called the section shrinkage ratio. It says, 'the units are %.' Where: S0-- the original cross-sectional area of the sample, mm2; S1-- the minimum cross-sectional area (mm2) at the shrinkage diameter after the specimen is pulled apart.

5, hardness index: metal material resistance to hard objects collapse surface ability, known as hardness. Hardness can be divided into brinell hardness, rockwell hardness, vickers hardness, shore hardness, microhardness and high temperature hardness, etc. There are three kinds of brinell, rockwell and vickers hardness commonly used for pipe.