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 ducts, superheater tubes, and air preheater tubes. These pipes are commonly found in boiler systems, heat exchangers, and condensers. They are also suitable for use in the chemical and petroleum industries, although they are not recommended for low-temperature environments due to potential brittleness and reduced performance.
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 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 | ||||
JIS G3461 is a standard that ensures high-quality carbon steel pipes suitable for demanding industrial applications. The material's composition and mechanical properties make it ideal for use in high-pressure and high-temperature environments. Proper manufacturing methods, including various heat treatments, ensure the pipes meet strict quality and performance requirements. This standard is particularly important in the design and construction of boilers and heat exchangers where reliability and durability are critical factors.
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