NV D500 Steel Plate

 

 

The specific reasons why the yield strength of NV D500 steel plates fluctuates as the thickness increases are mainly as follows:

Influence of Rolling Process

 

Change in Reduction Ratio: During the rolling process, thinner steel plates undergo a relatively larger reduction ratio, which refines the grains inside the steel and increases the dislocation density, thereby increasing the yield strength. As the thickness increases, the reduction ratio during rolling decreases, the degree of internal grain refinement is reduced, and the dislocation density is also relatively small, which may lead to a decrease in yield strength.

 

Uneven Rolling Temperature: When rolling thicker steel plates, due to the large thickness of the steel plates, heat transfer is relatively slow, which may lead to an uneven temperature distribution inside the steel plates during the rolling process. The surface temperature is lower, while the internal temperature is higher. This temperature difference will result in an inhomogeneous structure of the steel plates after rolling, which in turn affects the yield strength and causes it to fluctuate.

 

Difference in Micro - structure

 

Grain Size: Generally speaking, thinner steel plates are more conducive to the formation of a fine and uniform grain structure during the rolling process. The effect of fine - grain strengthening is obvious and can significantly improve the yield strength. On the contrary, the grain size of thicker steel plates is relatively large, the effect of fine - grain strengthening is weakened, and the yield strength will also be affected.

 

 

 

 

 

 

 

Grade	Mechanical Property
	Tensile Strength(MPa)	Yield Strength(MPa)	% Elongation in 2 in.(50mm) min	Impacting Test Temperature(°C)
NV D500	400-520	235	22	20

 

 

 

Influence of Residual Stress

 

Uneven Stress Distribution in the Thickness Direction: After rolling, the residual stress distribution in the thickness direction of thicker steel plates is more complex and uneven. There may be a relatively large compressive stress on the surface layer, while a tensile stress may exist in the core. This uneven residual stress distribution will change the internal stress state of the steel plates when they are under force, thus affecting the measured value of the yield strength and causing it to fluctuate.

 

Coupling between Residual Stress and Applied Stress: When a tensile test is carried out on a steel plate to measure the yield strength, the residual stress will couple with the applied stress. For thicker steel plates, this coupling effect is more significant and may cause the steel plates to reach the yield state under a lower applied stress, or make the yielding process discontinuous, thereby causing fluctuations in the yield strength.

 

 

 

 

 

 

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