JIS G 3461

JIS G 3461  Meaning

JIS G 3461 is a standard number of the Japanese Industrial Standard (JIS). It is used to specify the requirements for seamless steel pipes for carbon steel boilers and heat exchangers. These steel pipes are generally used in high temperature equipment, such as boilers, heat exchangers, heating equipment, etc. to transfer hot fluids (such as water, steam, etc.).

These tubes are engineered to facilitate efficient heat transfer both inside and outside. It makes them an excellent choice for a variety of applications, including water tubes, smoke tubes, superheater tubes, and air preheater tubes. They also find utility in the chemical and petroleum sectors. However, they are not suitable for low-temperature services.
Our JIS G 3461 tubes are crafted through seamless, electric resistance welding. They undergo normalization before cold finishing to ensure superior quality and longevity.


Outside diameters: from 15.9 mm to 139.8 mm.
They are produced through a seamless process and electric resistance welding. The steel grades we offer include STB340 (STB35), STB410(STB42), and STB510 (STB52).
We provide surface coatings, different end types, joint methods, and machining services. This ensures the tubes integrate seamlessly into your operations.

The specific content of the standard

The JIS G 3461 standard usually includes the following aspects:

  • Material composition
    The standard stipulates the chemical composition requirements used in carbon steel pipes, mainly focusing on the content of carbon, silicon, manganese, and other elements. These requirements help ensure the quality and suitability of piping materials.
  • Dimensions and Dimensional Tolerances
    The standard specifies the size range of carbon steel pipes and the allowable dimensional tolerances. This helps ensure pipe consistency during manufacture and reliability during assembly and use.
  • Mechanical properties
    JIS G 3461 specifies the mechanical properties of carbon steel pipes. This includes tensile strength, yield strength, elongation, etc. These performance requirements ensure the durability of the pipeline under high temperature and high pressure working conditions.
  • Heat treatment
    In some cases, standards may include heat treatment requirements for carbon steel pipes. This adjusts their microstructure and properties to suit different engineering needs.
  • Tests and Inspections
    Standards also usually specify the tests and inspection methods that carbon steel pipes need. This undergoes to verify compliance with the standard requirements. These tests may involve chemical analysis, mechanical performance testing, impact testing, etc.

The application of carbon steel pipes in high temperature and high pressure environments. This requires a high degree of durability and reliability. 

JIS G 3461 standard ensures quality and performance of seamless steel tubes for boilers and heat exchangers. And providing engineers, manufacturers, and users with a unified standard benchmark.