Metallographic structure of low carbon carbon steel of pure iron, 10 steel, 20 steel (annealed state)

Different types of materials have different microstructures. From the point of view of steel, it can be divided into low carbon steel, medium carbon steel and high carbon steel. The microstructure of low carbon steel can be divided into three types: pure iron, 10 steel and 20 steel (annealed state).

Pure iron is an iron containing only impurities, so it has no carbon contact phase. The microstructure of pure iron consists of austenite, ferrite and cementite. Its surface can be magnetically attracted and hard and brittle. Pure iron can be divided into white cast iron, malleable cast iron, vermicular cast iron, spheroidal graphite cast iron and ultra-low carbon steel according to the metallographic structure.

10 steel is a kind of low carbon steel. It is also known as low carbon steel or general structural steel. It is a kind of iron-carbon alloy. The amount of steel is generally 0.1%~0.2%, and its microstructure is pure ferrite. The structure of 10 steel is similar to pure iron. It is soft and tough, and can be magnetically attracted.

20 steel refers to low carbon steel in annealed state. According to the ratio of ferrite and cementite, it can be divided into two types: one is known as pearlite which contains a large amount of ferrite and little cementite. The other is called cementite which contains a large amount of cementite and little ferrite. The yield strength of 20 steel is low, but the impact toughness is good.

In summary, pure iron has no carbon contact phase and its microstructure consists of austenite, ferrite and cementite, while 10 steel and 20 steel are low carbon steels and their microstructures are pure ferrite and ferrite and cementite respectively. Each of these materials has different properties, so it is important to choose the right material for the task at hand.

Low carbon steel is a type of steel that contains a low percentage of carbon. Low carbon steel is made from iron ore, which contains small amounts of carbon. Typically, the amount of carbon in low carbon steels is less than 0.25 percent, which makes it much easier to machine and form than high carbon steels. This makes it ideal for applications where steel must be machined or worked on, such as car or ship bodies, or for any kind of construction.

Pure iron, or ferrite, is a type of low carbon steel that has a low percentage of carbon, usually less than 0.08 %. This relatively low carbon content makes it ductile and softer than ordinary iron. Pure iron is relatively easy to machine, as well as to weld, forge, and fabricate. It can also be used to make thin wires and rods, and magnets.

Low carbon steel can also be classified as wrought iron, which is also known as 10 steel. This type of steel contains a low amount of carbon, generally less than 0.25 %. Because of the lower carbon content, wrought iron is very ductile and malleable, and can be easily worked into different shapes. Further, it has a low coefficient of thermal expansion and is easy to weld and forge. Wrought iron is commonly used in the manufacturing of fences, railings, and other ornamental items.

Another type of low carbon steel is known as 20 steel, or annealed steel. It also has a low percentage of carbon, usually less than 0.25 %. As compared to 10 steel, 20 steel has a greater ductility. It can be used for applications where high strength and toughness are required, such as auto parts or structural components. 20 steel has a lower melting point, which helps in welding, riveting, and other manufacturing processes.