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What classification of cast iron?

Carbon content of more than 2% of the iron-carbon alloys. Industrial carbon content of cast iron is generally 2% to 4%. More carbon in cast iron exists in the form of graphite, sometimes also exists in the form of cementite. In addition to carbon, the iron also contains 1% to 3% silicon, and manganese, phosphorus, sulfur and other elements. Alloy cast iron also contains nickel, chromium, molybdenum, aluminum, copper, boron, vanadium and other elements. Carbon, silicon is the main element affecting the microstructure and properties of cast iron. Cast iron can be divided into:

① gray cast iron. Higher carbon content (2.7% to 4.0%), carbon exists mainly in the form of flake graphite, gray fracture, referred to as gray iron. Low melting point (1145 ~ 1250 ℃), a small amount of shrinkage during solidification, compressive strength and hardness close to the carbon steel, good shock absorption. Due to the presence of flake graphite, so good wear resistance. Casting and machining better performance. For the manufacture of machine bed, cylinder, box and other structural parts. The grade to back "HT" attached two sets of figures. For example: HT20-40 (first number represents the minimum tensile strength, and the second set of numbers is the lowest flexural strength).


② white cast iron. Carbon, silicon content is low, carbon exists mainly in the form of cementite, the fracture was silver. Solidification shrinkage is large, easy to produce shrinkage cracks. High hardness, brittleness, can not withstand the impact load. More as blanks and production of wear-resistant parts malleable iron.