Handle type fully welded ball valve Q61F DN150

When welding the fully welded ball valve Q61F DN40 with handle, the impurities such as S and P in the weld form low-melting eutectic during the process of product bonding. Among them, sulfur has the greatest influence on the formation of crystalline cracks, but its influence is most related to the content of other elements in the steel. For example, Mn combines with S to form MnS to remove sulfur, thereby suppressing the harmful effects of S. Mn can also improve the performance, morphology and distribution of sulfides.