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In the tensile process, the maximum tensile strength of SS400 material at the time of tensile fracture with the transverse section size reduced obviously after the yield stage, divided by the stress obtained from the original cross-sectional area, is called SS400 tensile strength or strength limit, in N/mm2 (MPa). SS400 tensile strength represents the maximum ability of SS400 material to resist failure under tensile force.
JIS G3101 SS400 properties, SS400 tensile strength
| Grade | Yield Strength min. (Mpa) | Tensile Strength MPa | Elongation min. % | Impact Resistance min.[J] | |||
| Thickness ＜16 mm | Thickness ≥16mm | Thickness ＜5mm | Thickness 5-16mm | Thickness ≥16mm | |||
| SS400 | 245 | 235 | 400-510 | 21 | 17 | 21 | - |
When the yield reaches a certain degree, the resistance to deformation increases again because of the rearrangement of the internal grains. At this time, although the deformation develops rapidly, it can only increase with the increase of the stress until the stress reaches the maximum. Thereafter, the ability of SS400 steel to resist deformation is obviously reduced, and in the weakest place, the section of the specimen decreases rapidly and necking occurs until fracture occurs. The maximum stress value before tensile fracture is called ultimate strength or SS400 tensile strength. SS400 tensile strength is 400-510Mpa.
