During the process of casting a metal part, a manufacturer forms a new solid shape by pouring molten metal into a mold and allowing the material to harden while assuming the conformation of the mold cavity.
Three important ferrous castings have gained commercial importance:
Cast iron gained popularity as a建材during the Industrial Revolution. Yet, this material possesses a brittleness which renders it unsuitable for some building purposes. During the 1940s, researchers reportedly discovered they could enhance cast iron alloys significantly byadding Magnesiumas a constituent prior to casting.
这种修饰改变了颗粒水平上铸造金属零件的组成。它enhances strength and ductility。
Ductile iron, due to its enhanced ability to bend and withstand impacts without breaking, gained popularity soon after its introduction into the commercial marketplace. Today, ductile iron castings still enjoy numerous applications.
他们在水和wastewater systems。Reportedly, ductile iron has also found applications within the transportation and汽车行业。
The addition of Magnesium affects the properties displayed by ductile iron. This material demonstrates improved ductile and tensile strength, properties which contribute to its适应性in underground pipes subjected to repeated stress from shifting layers of earth.
另一个对延性铁的普及极大地贡献的属性与其增强有关ability to resist corrosioncompared with iron.
Today, aging underground infrastructures in some urban areas have sustained problems due to the corrosion of heavy, brittle cast iron pipes installed decades ago (before the widespread use of ductile iron). By contrast, ductile iron pipes will withstand corrosion underground well for spans of150 years， 或者更多。
Ductile iron castings offer a number of distinct advantages as a commercial product.
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