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The specifications and performance requirements of JIS G3461 STB 340 boiler tubes are mainly based on the JIS G3461 standard, which specifies the technical conditions for carbon steel tubes for boilers and heat exchangers.
GNEE's JIS G3461 STB340 boiler seamless tubes can be delivered in hot-rolled state, or low-temperature annealed or normalized as required to meet different usage requirements. Finished product analysis, tensile test, flattening test, flaring performance test, etc. will be carried out to ensure the quality and reliability of JIS G3461 STB340 carbon steel boiler tubes.
JIS G3461 STB340 Carbon steel boiler tubes specifications
Chemical Composition
| Standard | Grade | Chemical Composition Limits (%) | ||||
| C | Si | Mn | P | S | ||
| JIS G3461 | STB340 | ≤ 0.18 | ≤ 0.3 | 0.30-0.60 | ≤ 0.035 | ≤ 0.035 |
Mechanical Properties
| Grade | Tensile Property (N/mm2) | Yield Point or Yield Strength (N/mm2) | Elongation (%) | ||
| OD ≥20 mm | 10 mm ≤OD ＜20 mm | OD ＜10 mm | |||
| NO. 11 Sample; NO. 12 Sample | NO. 11 Sample | NO. 11 Sample | |||
| Longitudinal | Transverse | Transverse | |||
| STB340 | ≥ 340 | ≥ 175 | ≥ 35 | ≥ 30 | ≥ 27 |
Tolerances of Length
| Division | Tolerance on length | ||
| 50 mm or under in outside diameter |
7 m or under in length | +0.7 mm | |
| 0 | |||
| Over 7 m in length | Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15 mm. | ||
| Over 50 mm in outside diameter |
7 m or under in length | +10mm | |
| 0 | |||
| Over 7 m in length | Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15mm. | ||
JIS G3461 Carbon Steel Heat Exchanger Tube
Reasons to choose GNEE
Gnee Steel Group Co., Ltd. is a professional manufacturer integrating research, development, production, sales and service. Our main products include galvanized steel pipes, steel pipes, and stainless steel pipes. Our main markets are located in North America, South America, Africa, Southeast Asia, and Oceania.
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