JIS G3461 Standard Boilers and Heat Exchangers
JIS G3461 carbon steel pipes are widely used in heat exchange systems, including water pipes, flue gas ducts, superheater tubes, and air preheater pipes. These pipes are commonly found in boiler systems, heat exchangers, and condensers. Additionally, they are suitable for use in the chemical and petroleum industries, though they are not recommended for applications involving low temperatures due to their limited performance under such conditions.
Chemical Composition:
| Grade | Manufacturing Process | Chemical Composition (%) | ||||||||
| C | Si | Mn | P | S | Ni | Cr | Mo | Others | ||
| STB35 | S, E | 0.18 Max | 0.35 Max | 0.30–0.60 | 0.035 Max | 0.035 Max | - | - | - | - |
| STB42 | S, E | 0.32 Max | 0.35 Max | 0.30–0.60 | 0.035 Max | 0.035 Max | - | - | - | - |
| STB52 | S, E | 0.25 Max | 0.35 Max | 1.00–1.50 | 0.035 Max | 0.035 Max | - | - | - | - |
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 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 or Cold Finished) | 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 standard is specifically designed for high-temperature environments, making it ideal for boiler and heat exchanger applications where durability and strength are essential. The material’s mechanical properties ensure reliable performance under demanding conditions, while its chemical composition provides a balance between strength and weldability. Proper heat treatment methods, such as normalizing and annealing, further enhance the material's structural integrity and service life. This makes JIS G3461 an excellent choice for industrial piping systems that require both efficiency and long-term reliability.
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