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 tubes. These pipes are commonly found in boiler systems, heat exchangers, and condensers. They are also applicable in the chemical and petroleum industries, though they are not recommended for use under low-temperature conditions due to their limited toughness at such temperatures.
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. |
Manufacture Method:
| 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 | ||||
These JIS G3461 pipes are designed for high-strength applications where durability and thermal resistance are essential. Their mechanical properties make them suitable for environments with moderate to high operating temperatures. The chemical composition ensures good weldability and formability, making them ideal for a variety of industrial uses. Proper heat treatment is crucial to achieving the desired mechanical performance, and the manufacturing methods vary depending on the grade and intended application.
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