Cast iron has a lot of very good mechanical properties. According to my personal knowledge in Dandong Foundry in China, herein I listed some main chemical properties for the reference to purchasers.
1. Tensile strength
Tensile strength is the most crucial physical property for iron castings. Its unit is RmN/mm2. Tensile strength will show the strength of cast iron when it is pulled until broken. For instance, the ductile iron 60-40-18 has tensile strength of 60000 psi therefore, it is equal to 414 Mpa. As a result, if your parts require to use this material, then your supplier must keep their iron castings with min. 414 Mpa tensile strength.
2. Yield strength
Yield strength is an additional definition to define the strength of cast iron I do not speak about its actual which means here. It is not really required to verify this house considering that it just more deeply measure the strength of cast iron. The tensile strength has currently covered the most of needs to the strength. As for the ductile iron 60-40-18, its yield strength is 40000 psi, equal to about 276 Mpa.
Often, elongation is quite crucial. High elongation implies the iron casting can be pulled to longer, which implies they have better ductility or called as malleability. For that reason, they will not be broken simply. The ductile iron has higher elongation than gray iron. As for the ductile iron 60-40-18, it has 18% elongation.
Hardness is also crucial occasionally. As for the machined components, the hardness ought to not be also high to have an effect on the machining method. As usual, the Brinell hardness from 160-220 need to be a great range. Too higher may cause the challenging spots during machining, also low will impact the application. Some purchasers necessary the Rockwell hardness as the normal. As for the comparison among these two requirements, please check our blog.
Some purchasers will demand V Charpy Influence Test to get the influence home of cast iron. This test requirements the professional lab. to perform. As I know, most of iron foundries in China do not have this testing equipment.
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