JIS · JIS G3462
JIS G3462 Standard: Alloy Tubes for Boilers and Heat Exchangers
Technical requirements of the JIS G3462 standard for heat exchanger tubes
This Japanese Industrial Standard (JIS G3462) regulates the parameters of cold-finished and hot-finished seamless alloy steel tubes intended for use in boiler installations and high-load heat exchangers. Products supplied by EV Group China comply with strict industry standards regarding chemical composition and mechanical properties necessary for efficient heat transfer in superheaters, fire-tube, and water-tube systems.
The standard does not cover specialized tubes for heating furnaces, nor does it apply to products intended for low-temperature cryogenic equipment.
Additional testing and quality control methods
In accordance with requirements for ensuring supply reliability, the following additional quality control options are provided for JIS G3462 tubes:
| Designation | Test Type / Characteristic |
|---|---|
| Appendix 1 Z1 | Material hardness testing |
| Appendix 1 Z2 | Determination of yield strength at elevated operating temperatures |
| Appendix 1 Z3 | Non-destructive testing using ultrasonic flaw detection |
| Appendix 1 Z4 | Structural integrity control using the eddy current method |
| Appendix 2 | Specification for the manufacturing of U-bent tubes for heat exchangers |