Usually also called gray iron casting pig iron.
Due to graphite soft, with lubrication, thus casting pig iron has good cutting, wear-resisting and casting performance.
But its tensile strength is not enough, so can not be forged, can only be used in the manufacture of all kinds of castings, such as casting a variety of machine tool bed, iron pipe, etc.
So, how to change the strength of the cast iron castings?
1, can choose fine-grain strengthening way to increase the tensile strength of the castings, we know the strength of the aluminum alloy generally all is relatively high, but in the case of the application or shall do a good job in the creation of the molten steel.
2, in pig iron casting, can add a small amount of carbon in the raw materials, due to the carbon content and its strength has very big correlation, in view of the general of pig iron castings, the carbon content of 2, 6%
Between 3 and 6%.
3, be able to add some silicon raw materials, the content of silicon is 1, 2%
32%, if the thickness of castings already, you can also add right amount of manganese.
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