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| 브랜드 이름: | YUHONG |
| 모델 번호: | JIS G3461 STB 340 탄소강 열교환기 튜브 |
| MOQ: | 1000KGS |
| 포장에 대한 세부 사항: | 플라스틱 캡과 함께 나무로 되는 케이스 /Iron Case/ 뭉치 |
| 지불 조건: | 신용장, 티/티 |
JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube Low-Temperature Boiler Tube
A seamless carbon steel tube made to JIS G3461 grade STB 340, with minimum 340 MPa tensile strength, for heat transfer service in boilers and heat exchangers. The main advantage of STB 340 is that it delivers lowest life-cycle cost for applications where temperature is ≤400°C and fluids are not highly corrosive. This material used in economizers, firetubes, feedwater heaters, and LP evaporators. It combines strength, ductility, weldability, and availability at a price point that is hard to beat.
Equivalent Grades (Cross-reference)
| Standard | Grade | Notes |
| ASTM A179 (USA) | Low-carbon seamless cold-drawn for heat exchangers | Almost identical; A179 requires 180 MPa min yield (slightly higher than STB 340) |
| ASTM A214 (USA) | Low-carbon welded for heat exchangers | Welded version, not seamless |
| EN 10216-1 (Europe) | P235TR1 or P235TR2 | P235TR2 is closest (TS 360–480 MPa, YS ≥ 235 MPa) |
| GB 3087 (China) | 10# or 20# seamless boiler tube | 20# is stronger (TS ≥ 410 MPa) |
| DIN 17175 (Germany, obsolete) | St35.8 | Replaced by EN 10216-1 P235TR2 |
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Most direct equivalent: ASTM A179 (same low carbon, same ductility, similar strength). STB 340 is often interchangeable with A179 for shell-and-tube heat exchangers. |
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| Standard | Grade | Chemical Composition Limits (%) | ||||
| C | Si | Mn | P | S | ||
| JIS G3461 | STB 340 | ≤ 0.18 | ≤ 0.3 | 0.30-0.60 | ≤ 0.035 | ≤ 0.035 |
Mechanical Properties of JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube Seamless Steel Boiler Tube
| 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 340 | ≥ 340 | ≥ 175 | 77 max. | ≥ 35 | ≥ 30 | ≥ 27 |
Comparison with STB 340 Carbon Steel Heat Exchanger Tube vs. STB 410 Carbon Steel Heat Exchanger Tube
| Grade | Tensile strength | Typical use | Cost |
| STB 340 | ≥ 340 (MPa) | Low/medium pressure, lower temperature (≤ 400°C): economizers, LP heat exchangers, firetubes | Lower |
| STB 410 | ≥ 410 (MPa) | Higher pressure/temperature (≤ 450°C): superheaters, high-pressure heat exchangers | Higher |
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Rule of thumb: Use STB 340 for economizers, feedwater heaters, and general low-temperature boiler tubes. Use STB 410 for superheaters and high-temperature waterwall tubes where creep strength is needed. |
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