First, when making cast iron castings, a small amount of carbon can be added to the raw materials. The carbon content is greatly related to its strength. For general cast iron castings, its carbon content is 2%. Between six and 3.6 percent, in addition to some silicon, the silicon content is between 1.2 and 33 percent, of course, in the case of determining the wall thickness of the cast iron casting , manganese should also be added in moderation.
The second is to use alloying method to improve the tensile strength of gray iron castings. We know that the strength of alloys is generally high, but the use of molten iron should be done during the use.