What is yield strength of ASTM A572 Grade 50 low alloy high strength steel plates

ASTM A572 Grade 50 low alloy high strength steel plates yield strength, also known as ASTM A572 Gr. 50 steel plates yield limit, is the yield point when ASTM A572 Grade 50 steel metal material occurs yielding, which is the resistance to micro-plastic deformation of the stress.It refers to ASTM A572 Grade 50 material yield critical stress value.

Usually when the yield strength is evident in the material, the yield value is the yield point stress. When the yield strength is not evident in the material, the limit deviation of stress-strain linear relationship reaches the specified stress at 0.2% permanent set. In the evaluation of mechanical properties of solid materials, the actual use limit of ASTM A572 Grade 50 steel material is because the material generates necking after yielding, the strain increases, and make ASTM A572 Grade 50 material loses its original function.

When the stress exceeds the elastic limit, the deformation increases rapidly, then in addition to the production elastic deformation, it also generates some plastic deformation. When the stress reaches point B, the plastic strain increases sharply, and the curve shows a small plateau. This phenomenon is called ASTM A572 Grade 50 low alloy high strength steel plates yielding. The maximum and minimum stresses at this stage are called the upper yield point and the lower yield point. The value of the lower yield point is stable, so we usually use ASTM A572 Grade 50 lower yield point as an indicator of A572 Grade 50 material resistance, and is called the yield point or yield strength.

Unlike ASTM A572 Grade 50 low alloy high strength steel plates, some steel has no obvious yield phenomenon, so when it occurs slight plastic deformation, the stress is regard as the yield strength of the steel material, known as the conditional yield strength.