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JIS G3461 steel pipe is a special type of carbon steel pipe that requires low-temperature annealing or normalizing. This kind of steel pipe can be used in the petroleum and chemical industries, but is not suitable for low temperature conditions.
Compared with other grades of carbon steel pipes, JIS G3461 STB 410 boiler steel pipes have higher mechanical strength and better corrosion resistance, so they have better application prospects in some specific fields.
STB340 heat exchanger steel pipe has a minimum tensile strength of 340 MPa and a minimum yield strength of 175 MPa, which means it has high mechanical strength and good fatigue resistance. This type of steel pipe is also easy to manufacture and can be joined by a variety of welding methods, giving it advantages in installation and maintenance as well.
Heat treatment of JIS G3461 STB410 seamless boiler pipe
| Grade | 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 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 | |
Hot finished seamless steel tube STB 410
Chemical Composition of JIS G3461 STB410 heat exchanger tubes
| Standard:JIS G3461 | Grade | Chemical Composition Limits (%) | ||||
| C | Si | Mn | P | S | ||
| STB 410 | ≤ 0.32 | ≤ 0.35 | 0.30-0.80 | ≤ 0.035 | ≤ 0.035 | |
Mechanical Properties of JIS G3461 STB410 boiler pipe
| Grade | Tensile Property (N/mm2) | Yield Point or Yield Strength (N/mm2) | Rockwell hardness HRB | Elongation (%) | ||
| OD ≥20 mm | 10 mm ≤OD ＜20 mm | OD ＜10 mm | ||||
| Longitudinal | Transverse | Transverse | ||||
| STB 410 | ≥ 410 | ≥ 255 | 79 max. | ≥ 25 | ≥ 20 | ≥ 17 |
JIS G3461 STB 410 specifies carbon steel pipes used for heat exchange inside and outside the pipe, hereinafter referred to as "pipes", such as water pipes, smoke pipes, superheater pipes, air preheater pipes, etc. Boilers, heat exchanger tubes, condenser tubes, catalyst tubes, etc. used in the chemical and petroleum industries.
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