logo  

EXPANSION JOINTS
MATERIALS




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

tubi metallici flessibili tubi metallici flessibili ondulati aggraffati
tubi flessibili in P.T.F.E. in gomma
attacchi rapidi a leva attacchi rapidi a leva

compensatori di dilatazione compensatori di dilatazione

Types of compensators 
Tables of compensators 
Planning  
Materials  
   Pipes expansions  
Factor of correction  
Thermal expansion  
Tests  
Fittings

componenti per tubazioni componenti per tubazioni