The yield point of ASME SA572 Gr.55 low alloy high strength steel structure determines the stress that SA572 Gr.55 structure can bear without permanent deformation. The minimum yield point of typical carbon structural steel is 235MPa. The minimum yield point of the typical low alloy high strength strength steel is 345MPa. Therefore, according to the ratio of yield points, the allowable stress of SA572 Gr.55 low alloy high strength structure steel is 1.4 times higher than that of carbon structure steel. Compared with carbon structural steel, the use of SA572 Gr.55 low alloy and high strength steel can reduce the size of the structural parts and reduce the weight. It must be noted that the allowable stress must be corrected to ensure the strength of SA572 Gr.55 steel structure for a member that may be bent.
Sometimes SA572 Gr.55 low alloy high strength structure steel is used instead of carbon structural steel, but without changing the section size, the sole purpose is to get a more durable structure without increasing the weight. Weight saving is most important for the structure of a vehicle, which can transport heavier weight and reduce energy consumption.
The strength of SA572 Gr.55 low alloy high strength structure steel is often improved by adding a small amount of niobium or vanadium or titanium. These elements are economically enhanced by precipitation and hardening. Other alloy elements that are added for various purposes can also be strengthened.
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