Steel Designation in Japan
Steel is one of the most important elements used in many industries today. It is not only used in structural applications such as building construction, engineering and shipbuilding but also in medical applications, automotive manufacturing, and other products and applications. In Japan, there are numerous classifications of steel according to their chemical makeup and usage.
The Japanese Industrial Standards (JIS) system is used to grade steel designations in Japan. The most common JIS standard system is the G number system. The numbers, written as G-x-a-b, refer to the various types of steel and their characteristics, such as yield strength and tensile strength. Carbon steels, alloy steels and stainless steels are the main types that are listed under the G classification. Each type of steel has different grades and strengths.
The G-1-a-b system is used for carbon steel designations. In this system, the number following the G stands for the carbon content of the steel, whereas the letter following the number refers to the characteristics of the steel such as stability, weldability or corrosion resistance. The last two characters refer to the yield strength in kilograms per square millimeter of the steel.
The G-2-b-x system is used for alloy steel designations. In this system, the first character refers to the alloying element, which is usually a metal such as chromium, manganese or nickel. The second character represents the strength of the alloy, and the last two characters refer to the ultimate tensile strength.
The G-3-a-b system is used for stainless steel designations. In this system, the first character refers to the alloying elements such as chromium, molybdenum or nickel. The second character represents the corrosion resistance and the last two characters refer to the yield strength.
In Japan, each type of steel has its own specific designation that is made up of the G-x-a-b system. While this system might be confusing at first, it is easy to understand once you learn the basics and know what each designation means. With the right information and understanding of the steel designation system in Japan, you will be able to determine the best kind of steel for your project or product.
