Performance index of steel pipe

Release Time :

2021-11-15 13:33

The mechanical property of steel is an important index to guarantee the final serviceability (mechanical property) of steel, which depends on the chemical composition and heat treatment system of steel. In the steel pipe standard, according to different use requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness indicators, as well as user requirements of high, low temperature performance.

① Tensile strength (σb)

The stress (σ) obtained by dividing the maximum force (Fb) of the specimen at tensile break by the original cross-sectional area (So) of the specimen in the tensile process is called the tensile strength (σb), and the unit is N/mm2 (MPa). It represents the maximum capacity of a metal material to resist damage under tensile force.

② Yield point (σs)

For metal materials with yield phenomenon, the stress at which the specimen can continue to extend without increasing the force (keeping constant) during the tensile process is called yield point. If the force drops, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa).

Upper yield point (σsu) : the maximum stress of the specimen before the first drop in force due to yield; Lower yield point (σsl) : the minimum stress in the yield stage, excluding the initial instantaneous effect.

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