NEWS

Physical performance differences

1. Strength: Cold rolled steel plates usually have higher strength. This is because during the cold rolling process, the internal structure and structure of the cold-rolled steel plate become more compact, resulting in higher strength and hardness of the cold-rolled steel plate. During the hot rolling process, the steel undergoes high temperature and plastic deformation, and its internal structure and structure are relatively loose, with relatively low strength and hardness.

2. Plasticity: Hot rolled steel plates have good plasticity, that is, they have good ductility. This makes hot-rolled steel plates more suitable for applications that require bending or deformation.

3. Resilience: Hot rolled steel plates have good toughness and can resist impact and vibration. In contrast, cold-rolled steel plates have slightly lower toughness, but due to their high strength, they can still meet the needs of many applications.

4. Formability: Hot rolled steel plates have good formability and are easy to process into various shapes. This is because during the hot rolling process, the plasticity of the hot-rolled steel plate is enhanced, making it easier to form the desired shape. Cold rolled steel plates have relatively poor formability due to their high strength and hardness, but they still have advantages in some situations that require high precision and high surface quality.

Chemical composition differences

1. Carbon content: The carbon content of hot-rolled steel plates is generally high, reaching around 0.2% to 0.5%, and some even up to 0.8% or more. The carbon content of cold-rolled steel plates is relatively low, generally not exceeding 0.1%. This is because the plasticity of the hot-rolled steel plate needs to be improved during the process, so the carbon content needs to be increased.

2. Sulfur and phosphorus content: Hot rolled steel plates have higher sulfur and phosphorus content, while cold-rolled steel plates have lower sulfur and phosphorus content. This is because during the chemical cleaning process of cold-rolled steel plate processing, the surface of the steel plate is subjected to acid and alkali washing treatment, which greatly reduces non-metallic impurities on the surface of the steel plate.

3. Manganese content: The manganese content in hot-rolled steel plates is usually low, generally not exceeding 2%; The manganese content in cold-rolled steel plates is relatively high, generally above 3%. This is because in the processing of cold-rolled steel plates, in order to ensure the balance of strength and toughness, more alloying elements are added to the steel plates, among which manganese is the most commonly used one in cold-rolled steel plates.

In addition to the above components, hot-rolled steel plates and cold-rolled steel plates also have certain differences in other chemical compositions, such as the oxide scale and silicon content on the surface of the steel plate. These differences give hot-rolled steel plates and cold-rolled steel plates their respective advantages in different application scenarios.