The tensile strength (Rm) of small-diameter seamless steel pipe refers to the maximum stress value the material withstands before breaking. When the small-diameter seamless steel pipe yields to a certain extent, its ability to resist deformation increases again due to the rearrangement of the internal grains. Although the deformation develops rapidly at this time, it can only increase with the increase in stress until the stress reaches maximum value. After that, the ability of the small-diameter seamless steel pipe to resist deformation was significantly reduced, and large plastic deformation occurred at the weakest point. The cross-section of the specimen here rapidly shrank, and necking occurred until fracture and failure. The maximum stress value before the small-diameter seamless steel pipe breaks under tension is called the strength limit or tensile strength.
During the tensile process of the sample, the material enters the strengthening stage after the yield stage and then the transverse cross-sectional size is significantly reduced. The maximum force (Fb) it endures at breakage is divided by the sample’s original cross-sectional area (So). Stress (σ) is called tensile strength or strength limit (σb), and its unit is N/(MPa). It represents the maximum ability of a metal material to resist damage under tension.
Post time: May-11-2024