China Iron and Steel Association (CISA) is the leading organization for iron and steel industry in China, representing most of the iron and steel companies and related industries. The association is an important link between the government and the iron and steel industry and plays a key role in the development of the industry.
CISA has developed a steel grade numbering system to clearly identify and differentiate between various types of steel. The steel grade numbering system consists of seven parts: steel type, grade, chemical composition, tensile strength, delivery process, impact value and application. The form of each part is as follows:
Steel Type: The first letter of the code indicates the type of steel, using the English alphabet. For example, L stands for carbon structure steel, S stands for carbon tool steel, and W stands for Low-Alloy Steel.
Grade: The second part of the code provides information about the grade of steel. The grade is usually indicated by a number, most often starting with a 1 or 2. For example, 10 stands for simple carbon steel, 15 stands for low carbon steel, 20 stands for high carbon steel, and 25 stands for low alloy steel.
Chemical Composition: The third part of the code gives information about the chemical composition of the steel. For example, 10L20 would mean a simple carbon steel with a low carbon content, while 25Cr25 could mean a low alloy steel with 25% chromium content.
Tensile Strength: The fourth part of the code provides information about the tensile strength of the steel. The tensile strength is usually indicated by a number from 1 to 4, with 1 indicating the lowest and 4 indicating the highest. For example, 10L20(4) indicates a simple carbon steel with a low carbon content, a tensile strength rating of 4, and a value close to or even exceeding 100MPa.
Delivery Process: The fifth part of the code indicates how the steel should be supplied. For example, TMCP stands for thermomechanical-controlled process, and FKM stands for flux cored wire-matt metallurgy.
Impact Value: The sixth part of the code provides information about the impact value of the steel. The impact value is usually indicated by a number from 1 to 6, with 1 indicating the lowest and 6 indicating the highest. For example, 10L20(4)1 indicates a simple carbon steel with a low carbon content, a tensile strength rating of 4, and an impact strength of 1.
Application: The seventh part of the code indicates where the steel should be used for. For example, PM stands for pressure vessel, FL stands for flange, and TK stands for hot extrusion.
The CISA steel grades are important for the industry and are adopted by many domestic and international companies and organizations. By using the CISA steel grades, you’ll be able to easily identify and differentiate between the various types of steel, allowing you to make an informed decision when it comes to purchasing the right kind of steel for your needs.
