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 EV Group China’s 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 |