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The grade of the alloy cast steel is still indicated by "ZG-" at the beginning, but in addition to the carbon content, it is also necessary to mark the type and content of the alloying elements. The type of alloying elements is indicated by the symbol of the chemical element, and the content is expressed by a percentage (the content of which is less than 1.5% may not be marked, but the type of the element still needs to be marked).
Commonly used medium and low alloy cast steels are: manganese steel (such as ZG40Mn), silicon-manganese steel (such as ZG35SiMn), manganese-molybdenum steel (such as ZG20MnMo), silicon-manganese-molybdenum steel (such as ZG35SiMnMo), manganese-molybdenum-vanadium steel (such as ZG42MnMoV). Lead steel (such as ZG40Cr), lead manganese silicon steel (such as ZG350rMnSi).
In some occasions, some special properties of high-alloy cast steel are required. Commonly used are high-manganese steel (ZGMn13), stainless acid-resistant steel (such as ZGCr17), heat-resistant steel (such as ZG3Cr25Si3Ni) and tool steel (such as ZGW18Cr4V).
Alloy cast steel In order to improve and improve certain properties of cast steel, one or several alloying elements are added to the cast steel to become alloy cast steel. The alloying elements added to the steel are mainly manganese (>0.8%), silicon (>0.4%), tungsten, molybdenum, chromium, titanium, boron, aluminum, cobalt, and the like. According to the content of alloying elements added, alloy cast steel can be divided into three categories: alloying element content of less than 5% for low alloy steel; between 5 and 10% of medium alloy steel; more than 10% of high alloy steel.