JIS G3461 Standard Boilers and Heat Exchangers
JIS G3461 Standard Boilers and Heat Exchangers
JIS G3461 carbon steel pipes are widely used in heat exchange applications, both inside and outside of piping systems. Common uses include water pipes, flue gas pipes, superheater tubes, and air preheater pipes. These pipes are extensively applied in boiler systems, heat exchangers, and condensers. Additionally, they are suitable for use in the chemical and petroleum industries, although they are not recommended for low-temperature environments due to their limited toughness at such conditions.
Chemical Composition:
| Grade | Mfg. Process | Chemical Composition (%) | ||||||||
| C | Si | Mn | P | S | Ni | Cr | Mo | Others | ||
| STB35 | S, E | 0.18Max | 0.35Max | 0.30~0.60 | 0.035Max | 0.035Max | - | - | - | - |
| STB42 | S, E | 0.32Max | 0.35Max | 0.30~0.60 | 0.035Max | 0.035Max | - | - | - | - |
| STB52 | S, E | 0.25Max | 0.35Max | 1.00~1.50 | 0.035Max | 0.035Max | - | - | - | - |
Mechanical Properties:
| Symbol of class | Tensile strength N/mm² {kgf/mm²} |
Yield point or proof stress N/mm² {kgf/mm²} |
Elongation % | ||
| Outside diameter 20mm or over | Outside diameter 10mm or over to and excl. 10mm | Outside diameter under 10mm | |||
| No. 11 test piece No. 12 test piece | No. 11 test piece | No. 11 test piece | |||
| STB340 STB410 STB510 |
340{35} min. 410{42} min. 510{52} min. |
175{18} min. 255{26} min. 295{30} min. |
35 min. 25 min. 25 min. |
30 min. 20 min. 20 min. |
27 min. 17 min. 17 min. |
Manufacturing Methods:
| Symbol of class | Heat Treatment | ||||
| Hot finished seamless steel tube | Cold finished seamless steel tube | Electric resistance welded steel tube other than hot finished or cold finished steel tube | Finished electric resistance welded steel tube | Fold finished electric resistance welded steel tube | |
| STB 340 | As manufactured, as required, low temperature annealing or normalizing may be performed. | Low temperature annealing, normalizing or full annealing. | Normalizing | As manufactured. However, as required, low temperature annealing or normalizing may be performed. | Normalizing |
| STB 410 | As manufactured. However, as required, low temperature annealing or normalizing may be performed. | Low temperature annealing, normalizing or full annealing. | Normalizing | Low temperature annealing | |
| STB 510 | Normalizing | ||||
JIS G3461 is a standard that ensures the quality and performance of carbon steel pipes used in high-temperature and high-pressure environments. The grades STB35, STB42, and STB52 each have distinct mechanical properties and chemical compositions tailored for specific applications. Proper heat treatment methods are essential to achieve the desired strength, ductility, and structural integrity. Whether used in power plants, industrial boilers, or chemical processing units, these pipes play a critical role in ensuring safe and efficient heat transfer operations. Always follow the manufacturer's guidelines for installation and maintenance to maximize the service life of the piping system.
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