In this article we will discuss about:- 1. Manufacture of Cast-Iron 2. Composition of Cast-Iron 3. Types 4. Properties 5. Uses 6. Castings 7. Types of Castings 8. Characteristics of a Good Casting 9. Defects in Casting. Manufacture of Cast-Iron: The cast-iron is manufactured by re-melting pig-iron with coke and limestone. This re-melting is done in a furnace known as [...]
Here is a list of commonly used cast iron: 1. Grey Cast Iron 2. White Cast Iron 3. Mottled Cast Iron 4. Nodular Cast Iron 5. Malleable Cast Iron 6. Alloy Cast Iron. 1. Grey Cast Iron: Composition: It is basically an alloy of carbon and silicon with iron. It contains C = 2.5- 3.8%; Si = 1.1-2.8%; Mn = [...]
In this article we will discuss about:- 1. Introduction to Cast Iron 2. Effects of Elements on Cast Iron 3. Types. Introduction to Cast Iron: Alloys of iron and carbon having carbon content more than 2.11%. Generally all cast irons have carbon content between 3 to 4% when Fe-Fe3C diagram is extended to 100% C. Graphite is a more stable [...]
There are six basic types of cast iron with several varieties of each as given below: Type # 1. White Cast Iron: White cast iron has all its carbon in the combined cementite form (i.e., free of graphite). Cementite is hard, brittle and white compound. As the fractured surface of white iron looks silvery-white and dull as the fracture occurs [...]
In this article we will discuss about:- 1. Introduction to Cast Irons 2. Composition and Cooling Rate of Cast Irons 3. Comparison of Properties 4. Science of Development of Microstructures. Introduction to Cast Irons: Cast irons are iron-carbon (and silicon) alloys having carbon or carbon equivalent value, more than 2% (actually it is 2.1 1%), i.e., more than the maximum [...]
Malleable irons, both pearlitic and ferritic are obtained after malleablizing-annealing of white cast iron of controlled compositions. As this annealing heat treatment takes long time, moreover there are difficulties in cooling thick sections rapidly enough to get the original white cast iron, S.G. iron has replaced the malleable iron in many applications. However, thin-section components that require maximum machinability and [...]
The graphite could be in flake (grey) form, or as nodules (ductile iron). These cast irons are divided in following classes: I. Nickel-alloyed, austenitic graphitic irons (Ni-Resist)- Both grey and nodular forms are used for high corrosion resistance, and for high-temperature service. II. High silicon (14.5% Si) grey irons are used in applications requiring corrosion-resistance. III. High silicon (4-6%) grey [...]
These cast irons have high abrasion-resistance, and can be readily cast in shapes required in machinery used for crushing and grinding, etc. Abrasion-resistance increases with the increase of hardness due to the increase of the volume of the eutectic carbides (alloy eutectic carbides are much harder than iron carbide). The must element chromium prevents the formation of graphite during solidification [...]
S.G. irons have nodules of graphite embedded in the matrix usually of ferrite, or pearlite, or both, depending on the thickness of the casting and/or alloy composition. As the nodule of graphite is not that serious stress-raiser, and that the ends are not that sharp (as flakes) to act as crack, the mechanical properties such as tensile strength, hardness, ductility, [...]
In this article we will discuss about:- 1. Meaning of Cast Iron 2. Melting of Pig Iron to form Cast Iron 3. Production of Different Grades of Cast Iron and their Physical Properties 4. Heat Treatment 5. Important Properties. Meaning of Cast Iron: Pig iron on account of its impurities is very weak and cannot be shaped into different articles [...]