JIS G3461 carbon steel pipes are mainly used for heat exchange inside and outside pipes, such as water pipes, flue gas pipes, superheater pipes, air preheater pipes, etc. Its application areas include: boiler pipes, heat exchanger pipes, and condensers. It can also be used in the chemical and petroleum industries, but cannot be used under low temperature 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. |
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 |
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