Japan is widely known for its top-notch steel pipes, and the composition of this material can vary widely depending on its intended use. In order to ensure the highest quality and most reliable steel, there is an organized system of steel grades and numbers that must be followed. Let’s take a look at the graded steel pipe numbers and what they mean.
Most Japanese steel pipes are divided into two major groups: General Purpose Steel (GP) and Structural Steel (SS). GP pipes can come in a variety of grades, but the most common are 708M20 (JIS G 4051) and S45C (JIS G 4051). These steel pipes have a tensile strength of 215 N/mm2 and are made to meet a wide range of industrial needs.
Structural steel pipes are typically used in the construction industry as they are able to bear heavy loads with repeated stress. The grade numbering is slightly different for these pipes, and includes two parts separated by a slash. The first part of the number stands for the tensile strength of the material, while the second part (after the slash) stands for the yield point. Common structural steel grades in Japan include SS41/SS400 (JIS G 3101), SS400M/SM400A (JIS G 3106), SS400B/SM400B (JIS G 3106).
Lastly, alloy steel pipes are another type of popular steel used in Japan. They come in a variety of grades, but the most common is SCM440 (JIS G 4105). This steel pipe is composed of Chromium, Molybdenum, and a bit of Manganese and is used in a broad range of structures and components. It is known for its good balance of strength and toughness, and is often found in parts of cars and other transportation vehicles.
By understanding the different steel grades and numbers, buyers can make informed decisions when purchasing steel products from Japan. The higher the number, the stronger the steel, and the more suitable it is for different types of applications. For example, SS41/SS400 is better than SS400M/SM400A for constructing buildings, while SCM440 is better for creating mechanical parts where strength and wear resistance are highly valued.
No matter what grade steel is chosen, it is important to keep in mind that each grade of pipe has its own specific characteristics and use. It is thus important to ensure that the correct steel type is being purchased, even if it is more costly. Japanese steel pipes are known for their high strength and reliability, so it’s best to invest in a steel product that is right for the job.
