Cast iron carbon content in more than 2% of the iron carbon alloy. Industrial iron carbon content is 2.5% ~ 3.5% in general. Many of carbon in cast iron graphite morphology exist, sometimes also with cementite. In addition to carbon, also contains 1% ~ 3% of silicon in cast iron, and manganese, phosphorus, sulfur and other elements. Also contain nickel, chromium, molybdenum alloy cast iron, aluminum, copper, boron, vanadium and other elements. Carbon, silicon, are main elements affect the microstructure and properties of cast iron. Cast iron can be divided into: (1) of grey cast iron. High carbon content (2.7% ~ 4.0%), carbon mainly exist in flake graphite morphology, fracture brown or grey. Low melting point (1145 ~ 1250 ℃), solidification shrinkage small, compressive strength and hardness is close to carbon steel, good shock absorption. Because flake graphite, good abrasion resistance. Casting and machining performance is better. Used in the manufacture of machine tool bed, cylinder, enclosure structure, etc. Behind the brand with "HT" attached to the two sets of figures. For example: HT20-40 (first figures show that the minimum tensile strength, a second set of Numbers
Cast iron is iron or a ferrous alloy which has been heated until it liquifies, and is then poured into a mould to solidify. It is usually made from pig iron. The alloy constituents affect its colour when fractured: white cast iron has carbide impurities which allow cracks to pass straight through.
By the time it arrives in your home, cast iron is one of the most durable materials you’re likely to lay your hands on. Getting it to that point, though, turns it to be an incredibly finicky process.
io9’s comment of the day comes from commenter amp0730, an engineer at an auto parts foundry. They explained just what goes in to making the cast iron so strong — plus the unlikely role that K-Y Jelly sometimes plays in the whole process:
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