JIS G3464 Low-Temperature Seamless Carbon Steel Pipes
JIS G3464 Steel Tubes for Low Temperature Service are steel tubes used for exchanging heat at exceptionally low temperatures, such as in heat exchangers and condensers. These tubes are specified by the Japanese industrial standard and are designed to withstand freezing temperatures. The tubes undergo different heat treatments based on their class, including normalizing, tempering, quenching, and tempering. They have specific chemical compositions and mechanical properties, including tensile strength, yield point, and elongation.
Heat Treatment
Symbol of class | Heat treatment |
STBL 380 | Normalizing or normalizing and successive tempering |
STBL 450 |
STBL 690 | Double normalizing and successive tempering or quenching and tempering |
Chemical composition
Symbol of class | chemical composition % |
C | Si | Mn | P | S | Nil |
STBL 380 | 0.25 max | 0.35 max | 1.35 max | 0.035 max | 0.035 max | - |
STBL 450 | 0.18 max | 0.10-0.35 | 0.30-0.60 | 0.030 max | 0.030 max | 3.20-3.80 |
STBL 690 | 0.13 max | 0.10-0.35 | 0.90 max | 0.030 max | 0.030 max | 8.50-9.50 |
Mechanical properties
Symbol of class | Tensile strength(N/mm²) | Yield point or proof stress (N/mm²) | Elongation % |
Outside diameter 20mm or over | outside diameter10mm or over to and excl 20mm | outside diameter under 10mm |
No.11 test piece No.12 test piece | No.11 test piece | No.11 test piece |
STBL 380 | 382 min | 206 min | 35 min | 30 min | 27 min |
STBL 450 | 451 min | 245 min | 30 min | 25 min | 22 min |
STBL 690 | 686 min | 520 min | 21 min | 16 min | 13 min |
Advantages:
- Low-Temperature Performance: JIS G3464 low-temperature seamless carbon steel pipes exhibit excellent performance at low temperatures, ensuring reliable operation and structural integrity in cold environments.
- High Strength: These pipes have high tensile strength and good impact resistance, allowing them to withstand the stresses and pressures associated with low-temperature conditions.
- Corrosion Resistance: The carbon steel material used in JIS G3464 pipes is often alloyed with other elements to enhance its corrosion resistance, making it suitable for various low-temperature applications.
- Seamless Construction: The seamless manufacturing process ensures uniformity, consistency, and enhanced mechanical properties of the pipes. Seamless pipes also have a smooth interior surface, reducing flow resistance and minimizing the risk of corrosion.
Applications:
- Heat Exchangers: JIS G3464 low-temperature seamless carbon steel pipes are commonly used in heat exchangers, which are devices used for transferring heat between two fluids at different temperatures. These pipes provide reliable and efficient heat transfer in low-temperature environments.
- Condensers: These pipes are also used in condensers, which are devices that convert vapor into liquid by removing heat. JIS G3464 pipes are suitable for condenser applications that operate at low temperatures.
- Low-Temperature Pipelines: These pipes are used in low-temperature pipelines for transporting fluids in industries such as petrochemical, chemical, and power generation. They ensure the safe and efficient flow of fluids in cold environments.
- Refrigeration Systems: JIS G3464 low-temperature seamless carbon steel pipes find application in refrigeration systems, such as in refrigeration units, cold storage facilities, and air conditioning systems.


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