Generally, we use the following materials.
Type | Material | Type | Material | Type | Material |
---|---|---|---|---|---|
Welded bellows | SUS316L | Formed bellows | SUS316L | Flexible tubes | SUS304 |
AM350 equivalent | HC-22 | SUS316L | |||
HC-22 | A3004 | ||||
A5052 |
*HC-22: Hastelloy®C-22
We also have a record of production performance for the following materials according to customer designation.
Type | Material | Type | Material | Type | Material |
---|---|---|---|---|---|
Welded bellows | SUS304 | Formed bellows | SUS304 | Flexible tubes | HC-22 |
SUS316 | SUS304L | A3004 | |||
INCONEL®600 | SUS316 | ||||
INCONEL®625 | INCOLOY®825 | ||||
Titanium, etc. | Titanium, etc. |
Basically...
Welded bellows can be manufactured as long as welding is possible.
Formed bellows can be manufactured as long as welding is possible and materials have elongation.
Classification | Materials | Features |
---|---|---|
Austenitic stainless steel | SUS304 SUS304L |
These materials demonstrate machinability and weldability, and heat-resisting and corrosion resistance property to some extent. SUS304L has been improved in corrosion resistance by reducing carbon to 0.03% or less. |
SUS316 SUS316L |
These materials are commonly used as bellows materials. Among austenitic stainless steel materials,they are particularly excellent in corrosion resistance. Corrosion resistance has been improved by adding molybdenum to SUS304. SUS316L has been improved in corrosion resistance by reducingcarbon to 0.03% or less. |
|
Semiaustenitic precipitation harding stainless steel |
AM350 equivalent | This material offers excellent formability in the solution treatment state, and can be combined with high hardness by heat treatment. Since the yield strength is high, it has spring characteristics with little hysteresis, and also since the tensile strength is high, bellows with high life performance can be manufactured. |
High nickel alloy | Hastelloy®C-22 | This Ni-Cr-Mo alloy demonstrates excellent corrosion resistance and heat-resisting in an oxidizing atmosphere. Hastelloy®C-22 is a registered trademark of Haynes International, Inc., and is equivalent to UNS 06022. It can undergo plastic working or forming in a manner similar to stainless steel. |
Aluminum alloy | A3004 | The composition of this Al-Mn based aluminum alloy is Al-1.2Mn-1.0Mg. Because it is excellent in formability and corrosion resistance, this material is best for formed bellows. |
A5052 | The composition of this Al-Mg based aluminum alloy is Al-2.5Mg-0.25Cr. This is the most representative alloy demonstrating moderate strength, and excellent in corrosion resistance, weldability, and formability. |
The features of three types of bellows materials commonly used by us are summarized in the following table.
Corrosion resistance |
Heat resistance |
Lifetime characteristics |
Magnetism | Price | |
---|---|---|---|---|---|
SUS316L | ○ | ○ (500°C or less) |
○ | Non-magnetic | Low |
AM350 equivalent (welded bellows only) |
× | ○ (450°C or less) |
◎ | Magnetic | Higher than SUS |
Hastelloy®C-22 | ◎ | ◎ (800°C or less) |
○ | Non-magnetic | High |