Introduction
Steel is a commonly used materia in China and is a vital component in many industries. Steel is an essential component of various building materials, automobiles and manufacturing processes, making it the most popular metal on the planet. By understanding different types of steel and the different classifications of steel, Chinese customers will have a better grasp of what steel is best for their specific needs and applications. This paper will explain the classification and manufacturing standards of steel in China, as well as the differences between common steel grades.
Types of Steel
The most common types of steel used in China include carbon steel, alloy steel, stainless steel, spring steel, tool steel, high-speed steel, etc. Carbon steel is an alloy of iron and contains a small percentage of other elements such as carbon, manganese and silicon. Alloy steel is an alloy of iron, carbon and other elements such as nickel, chromium, molybdenum, etc. Stainless steel is an alloy of iron, chromium and other elements. Spring steel is a special type of alloy steel that has high tensile strength and is extremely resistant to deformation. Tool steel is an alloy of iron and carbon, with other elements such as nickel, chromium, tungsten, molybdenum, etc. High-speed steel is a special type of tool steel that is capable of maintaining its hardness at high temperatures and extremely high pressures.
Classification of Steel
Steel in China is classified into different grades and shapes according to national standards. These steel grades can be divided into hot-rolled, cold-drawn, cold-worked and annealed. On the other hand, different shapes of steel include round, square, hexagonal, wire, bar and plate.
Hot-rolled steel is produced by further processing hot rolled coils. The process involves heating the hot rolled coils to a certain temperature, rolling it through a series of rollers to achieve the desired shapes and thickness, and then cooling it to room temperature.
Cold drawn steel is produced through a similar process but at a much lower temperature than hot rolled steel. The steel is pulled through a series of rollers at a predetermined speed to achieve the desired shape and thickness.
Cold-worked steel is produced by subjecting cold-drawn steel to additional rolling and cold rolling. This process increases the strength, ductility and hardness of the steel.
Annealed steel is produced by allowing the hot-rolled steel to cool slowly and naturally. This process allows the steel to become harder and more resistant to wear and tear.
Standardization of Steel
China has established a set of standards defining the performance and properties of various steel grades. These standards are published by the China Iron and Steel Association (CISA). The standards provide detailed information about the chemical composition, mechanical properties and other performance characteristics of various grades of steel. For example, the standard for carbon steel includes information on the carbon content, yield strength, elongation and hot strength of the material.
Conclusion
Steel is a major component of various products and processes throughout China. By understanding the different types, classifications and standardization of steel, Chinese customers will have a better grasp of what steel is best for their specific needs and applications. This paper has provided an overview of the types, classifications and standards associated with steel in China, as well as the differences between common steel grades.
