Mechanical Properties of Seamless Steel Pipe

Mechanical properties of steel is to ensure that the steel end-use properties, they are an important indicator, it depends on the chemical composition and heat treatment of steel system. In the steel pipes standards, depending on the usage requirements, provisions the tensile properties (tensile strength, yield strength or yield point elongation) and hardness, toughness index, as well as user requirements of high and low temperature properties.

① tensile strength (σb), it represents resist damage maximum capacity of metal material under tension.

② yield point (σs), metallic material having a yield phenomenon, force does not increase stress could continue to spread, during the tensile, called yield point.

③ the Elongation (σ), in the tensile test, the specimen fractured its gauge of the percentage increase in the length of the original gauge length, called elongation.

④ section shrinkage (ψ), in the tensile test, the specimen fractured its biggest percentage reduction in the amount of the original cross-sectional diameter of the cross-sectional area reduction, known as section shrinkage.

⑤ hardness index, metal material to resist indentation capacity hard surface objects, called hardness.