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The influence of high temperature on SPA-C weathering steel plate

The influence of high temperature on SPA-C weathering steel plate

1. Crystal growth and thickening of SPA-C weathering steel plate. Depending on the composition of the metal material, the degree of roughening is also different. SPA-C weathering steel plate containing carbon, manganese, and phosphorus is easy to roughen, while aluminum, titanium, niobium, zirconium and other elements can inhibit the roughening. Therefore, steel deaminated by manganese and silicon is used as a substantially coarse-grained steel. Copper and aluminum alloy profiles also show a coarse-grained structure after overtemperature.

2. SPA-C weathering steel plate is prone to Webster's mechanism. The metallographic structure in the steel is thicker, and the fiber bundle becomes wider for a long time. Widmanstatten structure also exists in over-temperature copper and aluminum bronze, and the degree of malignant transformation of Widmanstatten structure to plastic deformation and ductility is higher than that of over-temperature coarse-grained structure.

3. When the SPA-C weathering steel plate is over-temperature, the increase of the metallographic structure will lead to the decrease of the strength during the heat treatment and the decrease of the fracture toughness after quenching.

In the heat treatment process, due to the different plastic deformation of several mechanisms, it is easy to cause cracks in SPA-C weathering steel plate. In addition, the metallographic structure is easily transformed into phases, which makes SPA-C weathering steel plate tough. By controlling the heating temperature and residence time at high temperatures, the over-temperature mechanism can be avoided.

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