JIS G3461 Standard Boilers and Heat Exchangers
JIS G3461 Standard Boilers and Heat Exchangers
JIS G3461 carbon steel pipes are widely used in heat exchange systems, including water pipes, flue gas pipes, superheater tubes, and air preheater tubes. These pipes are commonly applied in boiler systems, heat exchangers, and condensers. Additionally, they are suitable for use in the chemical and petroleum industries, although they are not recommended for low-temperature environments due to their limited toughness at such conditions.
Chemical Composition:
| Grade | Manufacturing Process | Chemical Composition (%) | ||||||||
| C | Si | Mn | P | S | Ni | Cr | Mo | Others | ||
| STB35 | S, E | 0.18 Max | 0.35 Max | 0.30–0.60 | 0.035 Max | 0.035 Max | - | - | - | - |
| STB42 | S, E | 0.32 Max | 0.35 Max | 0.30–0.60 | 0.035 Max | 0.035 Max | - | - | - | - |
| STB52 | S, E | 0.25 Max | 0.35 Max | 1.00–1.50 | 0.035 Max | 0.035 Max | - | - | - | - |
Mechanical Properties:
| Symbol of Class | Tensile Strength N/mm² {kgf/mm²} |
Yield Point or Proof Stress N/mm² {kgf/mm²} |
Elongation (%) | ||
| Outside Diameter 20mm or Over | Outside Diameter 10mm or Over to Excl. 10mm | Outside Diameter Under 10mm | |||
| No. 11 Test Piece No. 12 Test Piece | No. 11 Test Piece | No. 11 Test Piece | |||
| STB340 STB410 STB510 |
340{35} min. 410{42} min. 510{52} min. |
175{18} min. 255{26} min. 295{30} min. |
35 min. 25 min. 25 min. |
30 min. 20 min. 20 min. |
27 min. 17 min. 17 min. |
Manufacturing Methods:
| Symbol of Class | Heat Treatment | ||||
| Hot Finished Seamless Steel Tube | Cold Finished Seamless Steel Tube | Electric Resistance Welded Steel Tube (Other than Hot or Cold Finished) | Finished Electric Resistance Welded Steel Tube | Fold Finished Electric Resistance Welded Steel Tube | |
| STB 340 | 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 | ||||
JIS G3461 is a standard that ensures high-quality carbon steel pipes suitable for high-temperature applications. The material’s mechanical properties, such as tensile strength and elongation, make it ideal for demanding industrial environments. Proper heat treatment methods, like normalizing and annealing, help enhance the material’s performance and durability. Whether used in power plants, chemical processing units, or oil refineries, JIS G3461 provides reliable and consistent performance under various operational conditions.
Water Misting Fan,Water Spray Fan,Folding Humidifying Fan,Desktop Humidifier Fan,Handheld Humidifier Fan
Shenzhen Baidi Technology Co.,Ltd , https://www.szpaddy.com