one、definition

two、classification

（one）Classified by carbon content

1. mild steel（carbon content≤0.25%）
• characteristic：Low carbon steel has relatively low strength and hardness，But it has good plasticity and toughness，Easy to process and weld。for example，Low carbon steel cold-rolled sheet is commonly used in manufacturing automotive bodies、Home appliance shells, etc。
• application：Widely used in architecture、car、household electrical appliances、Fields such as mechanical manufacturing，Especially suitable for parts that require a large amount of stamping and forming。
2. medium carbon steel（carbon content0.25%～0.60%）
• characteristic：Medium carbon steel has high strength and hardness，Has good comprehensive mechanical properties。After heat treatment，Its performance can be further improved。for example，After quenching and tempering treatment, medium carbon steel，Can be used to manufacture gears、Mechanical components such as shafts。
• application：Mainly used for manufacturing various mechanical structural components、Transmission components, etc，Like the transmission shaft of a car、gear，And the spindle of the machine tool, etc。
3. high-carbon steel（carbon content≥0.60%）
• characteristic：High carbon steel has high hardness and wear resistance，But poor plasticity and toughness。It is usually used to manufacture tools and components that require high wear resistance。for example，High carbon steel can be used to manufacture files after heat treatment、Tools such as saw blades。
• application：Mainly used for manufacturing tools、mold、Springs, etc，Like spring steel、Cutting tool steel, etc。

（two）Classified by processing technology

1. Hot rolled carbon steel plate
• characteristic：Hot rolled carbon steel plate is produced through high-temperature rolling，Has high production efficiency and low cost。Its dimensional accuracy is relatively low compared to cold-rolled steel plates，But the thickness and width range are relatively wide。for example，Hot rolled carbon steel plates are commonly used in building structures、Large scale projects such as bridges。
• application：Suitable for those with low requirements for dimensional accuracy，But in situations where larger thickness and width are required，Like steel beams used in construction、Steel columns, etc。
2. Cold rolled carbon steel plate
• characteristic：Cold rolled carbon steel plate is processed by cold rolling on the basis of hot rolling，High dimensional accuracy、Good surface quality、Advantages of high strength。for example，Cold rolled carbon steel plates are commonly used in the manufacturing of automotive bodies、Products such as household appliance casings that require high surface quality and dimensional accuracy。
• application：Widely used in automobile manufacturing、Home appliance production、Fields such as mechanical manufacturing，Especially suitable for stamping、Welding and other processing techniques。

three、Performance characteristics

1. Good Processability
• Carbon steel plate has good machinability，It can be done through stamping、cut、Various processing methods such as welding are used to produce various shapes of components。for example，Low carbon steel cold-rolled sheet can be easily stamped into complex shaped components of automotive bodies。
2. Moderate mechanical performance
• The strength and hardness of carbon steel plates can be adjusted according to the carbon content and heat treatment process。Low carbon steel has good plasticity and toughness，Suitable for processing that requires significant deformation；Medium carbon steel and high carbon steel have higher strength and hardness，Suitable for manufacturing mechanical structural components and tools。
3. Low cost
• The main components of carbon steel plate are iron and carbon，Rich resources，Mature production process，Relatively low cost。This has made carbon steel plates widely used in industrial manufacturing，Especially in cost sensitive areas，Such as architecture and automobile manufacturing。

four、application area

1. construction industry
• Carbon steel plate is one of the main materials for building structures。Hot rolled carbon steel plates are commonly used to manufacture steel beams、steel column、Steel trusses and other building components，Structure used to support buildings。for example，In the construction of large bridges，Hot rolled carbon steel plates can be used to manufacture the main beams and piers of bridges。
2. automobile making
• Most of the components of a car body，Like a car door、car roof、Engine hood, etc，They are all stamped from cold-rolled carbon steel plates。Low carbon steel cold-rolled sheet has good stamping and welding properties，Can meet the requirements of automobile body manufacturing。
3. Machinery manufacturing
• Carbon steel plate can be used to manufacture various mechanical components，Like gears、axle、Springs, etc。After heat treatment, medium carbon steel and high carbon steel，Can meet the strength and wear resistance requirements of mechanical components。