How to improve the tensile strength iron castings?

      Improve the tensile strength of gray cast iron, should adopt a low carbon equivalent, gray cast iron mostly carbon content of 2.6% to 3.6% silicon content of 1.2% ~ 33.0%, according to the casting wall thickness limit as much as possible to take the case, appropriate to improve the content of manganese, iron and manganese content of the ash is generally from 0.4% to 1.2%, in the case of white cast does not appear to take the upper limit as much as possible. Another approach can also be taken to improve the tensile strength alloy castings, adding the appropriate micro alloy such as: chromium, molybdenum, tin and other elements can also be significantly improved tensile strength of gray cast iron, while pregnant with good handling hot metal on can.