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MATERIALS
The basic material to be used for the moulding of the bellows, have to meet the following characteristics:
- efforts resistant
- corrosion resistant
- weldability
For these reasons, the material more used is the AISI 321 stainless steel (max. temp. 800°C).For superior values of temperature or corrosion it is used AISI 316/316L stainless steel, or alloy steels as Inconel, Incoloy, Hastelloy, Nichel and Monel.
| Expansion joint type |
Connection material |
Tie-rods material |
Max temperature |
| Axial with flanges |
Fe 410 B UNI 7746
Fe 42 B UNI 7070
Fe 44 B UNI 7070 |
|
343 °C |
Fe 410.1 KW
UNI 5869
ASTM A 105 |
|
454°C |
| Axial with welding ends |
ASTM A 106 Gr.B |
|
454°C |
| Hinged and Gimbal |
ASTM A 106 Gr.B |
Fe 37 B UNI 7070
Fe 42 B UNI 7070
Fe 44 B UNI 7070 |
343°C |
| |
Fe 410.1 KW
UNI 5869 |
454°C |
|
