JIS Carbon Steel Boiler and Heat Exchanger Tubes
JIS G3461 is a JIS standard refers to boiler tubes,heat exchanger tubes, condenser tubes etc. This steel pipe is used in carbon steel pipes for tube heat-exchange inside and outside, such as boiler water steel pipe, superheater tube, condenser tube and more.
However, it is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service.
The size range of JIS G3461 boiler tube(mm):
- Outer Dimensions: 19.05mm-168.3mm
- Wall Thickness:2.0mm- 14 mm
- Length: max 19000mm
Application of JIS G3461 seamless tubes:
- used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superherater tubes, air preheater tubes, etc. of boilers, and heat exchanger industries.
- it is not applicable to the steel tubes for heating furnace and those for heat exchangers for low temperature service.
The main products of steel / steel grade:
- JIS G3461 STB340
- JIS G3461 STB410
- JIS G3461 STB510
JIS G3461 tube Chemical Compositions(%)
| Grade | C | Si | Mn | P | S | Cr | Mo |
| G3461 STB340 | ≤0.18 | ≤0.35 | 0.30-0.60 | ≤0.035 | ≤0.035 | / | / |
| G3461 STB410 | ≤0.32 | ≤0.35 | 0.30-0.80 | ≤0.035 | ≤0.035 | / | / |
| G3461 STB510 | ≤0.25 | ≤0.35 | 1.00-1.50 | ≤0.035 | ≤0.035 | / | / |
JIS G3461 tube Mechanical Properties
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| G3461 STB340 | ≥175 | ≥340 | ≥35 |
| G3461 STB410 | ≥255 | ≥410 | ≥25 |
| G3461 STB510 | ≥295 | ≥510 | ≥25 |
Corresponding to international standards
- ISO 9329-2:1997 Seamless steel tubes for pressure purposes−Technical delivery conditions−Part 2: Unalloyed and alloyed steels with specified elevated temperature properties.
- ISO 9330-2:1997 Welded steel tubes for pressure purposes−Technical delivery conditions−Part 2: Electric resistance and induction welded unalloyed and alloyed steel tubes with specified elevated temperature properties.
Delivery Condition:
- Heat treatment,Annealed, Normalized, Normalized and Tempered
Surface treatment:
- Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting
- Painting as requested.
