Japanese Standard Steel Numbering Method
In Japan, steel is standardized by the Japanese Industrial Standards (JIS). The JIS G number is the standard number used to designate steel products, covering steel plates, sheets, strips, sections, bars and pipes.
JIS G numbers are homogeneous over a large range of steel products to ensure that they can be easily identified and tracked. The numeric series is also used to differentiate between different kinds of steel products and their characteristics.
Steel is designated with an alphanumeric combination, of which the first two digits represent the main steel category. For example, the main category for plates is 30, for strips it is 17, for sections it is 14 and for pipes it is 31. The third letter of the code represents the primary manufacturing process used in the product, such as R for rolling.
Now, the standard numbers that follow are unique for each type of steel product. Standard numbers consist of four digits, and the first two represent the steel grade name. For example, 3105 represents a grade of aluminum alloy and 0605 represents an alloy of chromium, molybdenum, and manganese. In most cases, the last two digits give the particular alloys specific characteristics.
In some cases, the first two digits of the standard number can be 00, which indicates that the steel is a general purpose material with no specific application. For example, steel 720000 is a general purpose tool steel which is slightly harder than mild steel but has no other specific properties.
When ordering Japanese steel, it is important to know the right standard number to ensure that the right kind of steel is delivered. The steel manufacturer also needs to know the correct standard number in order to identify the best type of steel to fulfill the specific needs of the buyer.
To make it easier for both the buyer and the manufacturer to track the grade and quality of each product, JIS has developed an international steel grade numbering system. This system consists of a five-digit number - the first two digits represent the steels basic properties, the third and fourth indicate the specific alloy characteristics and the fifth letter denotes the country of origin.
The international steel grade numbering system enables buyers and manufacturers from around the world to communicate and trade in steel products more easily. By having a standardized system for numbering steel, buyers and manufacturers can quickly understand the properties of each product being offered by the other.
In conclusion, the Japanese steel numbering system is a powerful and efficient way to identify, track and trade in steel products. This system ensures that buyers can differentiate between different kinds of steel and their specific characteristics, while also providing a way to communicate steel grades and properties amongst buyers and manufacturers from all around the world.
