JIS G3461 specifies the carbon steel tubes used for heat exchange in boilers, heat exchangers, condensers, and similar equipment.
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JIS G3461 is a Japanese Industrial Standard that specifies the carbon steel tubes used for heat exchange in boilers, heat exchangers, condensers, and similar equipment. These tubes are designed to transfer heat both on the inside and outside of the tubes, such as water tubes, smoke tubes, superheater tubes, air preheater tubes, condenser tubes, catalyzer tubes, and more.
JIS G3461 was first issued in 1988 and was last updated in 2019. It is based on international standards ISO 9329-2 and ISO 9330-2 but with modifications to meet the technical requirements of Japan's industries.
This standard specifies the technical requirements for seamless and welded carbon steel tubes with properties suitable for high-temperature service. The tubes must be heat treated, either normalized or quenched and tempered, depending on their manufacturing process.
JIS G3461 is a Japanese Industrial Standard that sets the guidelines for the manufacture of carbon steel tubes used in various types of heat exchangers and boilers.
| Grade | C | Si | Mn | P | S | Cr | Mo |
| STB 340 | ≤0.18 | ≤0.35 | 0.30-0.60 | ≤0.035 | ≤0.035 | / | / |
| STB 410 | ≤0.32 | ≤0.35 | 0.30-0.80 | ≤0.035 | ≤0.035 | / | / |
| STB 510 | ≤0.25 | ≤0.35 | 1.00-1.50 | ≤0.035 | ≤0.035 | / | / |
| STBA22 | ≤0.15 | ≤0.50 | 0.30-0.60 | ≤0.035 | ≤0.035 | 0.80-1.25 | 0.45-0.65 |
| STBA23 | ≤0.15 | 0.50-1.00 | 0.30-0.60 | ≤0.030 | ≤0.030 | 1.00-1.50 | 0.45-0.65 |
JIS G3461 carbon steel tubes are mainly 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.
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) |
Elongation (%) |
| STB 340 | ≥175 | ≥340 | ≥35 |
| STB 410 | ≥255 | ≥410 | ≥25 |
| STB 510 | ≥295 | ≥510 | ≥25 |
| STBA22 | ≥206 | ≥412 | ≥30 |
| STBA23 | ≥206 | ≥412 | ≥30 |
The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.
| JIS G3461 | ASTM | ASME | BS | DIN | ISO | ABS | NK | LRS | DNV |
| STB 340 | A178 | SA178 A | 3059-P1 320 | 17175 st 35.8 | ABS D | KSTB 33 | Sec 6 320 | Sec 4-E-TS360 | |
| STB 410 | A178 C | SA178 C | 3059-P2 440 | 17175 st 45.8 | ABS F | KSTB 42 | Sec 6 410 | Sec 4-E-TS410-1 | |
| STB 510 | 17175 19Mn 5 | Sec 4-E-TS510 |
The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.
| 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 | |
| STB340 | 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 | ||||
We also offer steel fabrication service where steel plates can go through processings like cutting, welding, bending, machining, pre-coating, pre-lined, beveling, or as you require. Our steel mills have fabricating employees that have 5-10 years of working experience. If you are interested in buying JIS G3461 steel tube products, contact us now for the latest price or check the following table for equivalent steel grade of JIS G3461.
Tolerances of Wall Thickness
| Tolerances | Division of wall thickness (mm) |
Division of method of manufacture | Hot finished seamless steel tube | Cold finished seamless steel tube | Electric resistance welded steel tube | |||
| Division of outside diameter (mm) | Under 100 | 100 or over | Under 40 | 40 or over | Under 40 | 40 or over | ||
| Tolerances on wall thickness % | Under 2 | --- | --- | +0.4mm | +22 0 |
+0.3 | +18 0 |
|
| 0 | 0 | |||||||
| 2 or over to and excl. 2.4 | +40 | --- | +20 0 |
+18 0 |
||||
| 0 | ||||||||
| 2.4 or over to or excl. 3.8 | +35 | +35 | ||||||
| 0 | 0 | |||||||
| 3.8 or over to or excl. 4.6 | +33 | +33 | ||||||
| 0 | 0 | |||||||
| 4.6 or over | +28 | +28 | ||||||
| 0 | 0 | |||||||
| Tolerances on thickness disparity% |
--- | Within 22.8 of wall thickness | --- | --- | ||||
Tolerances of Outside Diameter
| Division of outside diameter | Tolerances on outside diamete | |||
| Hot finished seamless steel tube | Cold finished seamless steel tube | Electric resistance welded steel tube other than cold finished | Cold finished electric resistance welded steel tube | |
| Under 25 | +0.4 -0.8 |
【0.10 | 【1.5 | 【0.10 |
| 25 or over to and excl. 40 | 【0.15 | 【0.20 | 【0.15 | |
| 40or over to and excl. 50 | 【0.20 | 【0.25 | 【0.20 | |
| 50 or over to and excl 60 | 【0.25 | 【0.30 | 【0.25 | |
| 60 or over to and excl. 80 | 【0.30 | 【0.40 | 【0.30 | |
| 80 or over to and excl. 100 | 【0.40 | +0.40 | 【0.40 | |
| -0.60 | ||||
| 100 or over to and excl.12 | +0.4 -1.2 |
+0.40 -0.60 |
+0.40 -0.80 |
+0.40 |
| -0.60 | ||||
| 120 or over to and excl.160 | +0.40 -0.80 |
+0.40 -1.00 |
+0.40 | |
| -0.80 | ||||
| 160 or over to and excl.200 | +0.4 | +0.40 | +0.40 | +0.40 |
| -1.8 | -1.20 | -1.20 | -1.20 | |
| 200 or over | +0.4 | +0.40 | +0.40 | +0.40 |
| -2.4 | -1.60 | -1.60 | -1.60 | |
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. | ||
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