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Bellows Material
Materials used for bellows
Generally, we use the following materials.
※ AM350® is a registered trademark of Allegheny Ladium, Inc.
※ Hastelloy® C-22 is a registered trademark of Haynes International, Inc.
※ INCONEL®・INCOLOY® is a registered trademark ofSpecial Metals Corporation.
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.
| Type | Material | Type | Material | Type | Material |
|---|---|---|---|---|---|
| Welded Bellows | SUS316L | Formed Bellows | SUS316L | Flexible Tube | SUS304 |
| AM350® Equivalent material |
Hastelloy®C22 Equivalent material |
SUS316L | |||
| Hastelloy®C-22 Equivalent material | A3004 | ||||
| A5052 |
※ Hastelloy® C-22 is a registered trademark of Haynes International, Inc.
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 Tube | A3004 |
| SUS316 | SUS304L | ||||
| 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.
Features of materials
We generally use the following materials.
※ AM350® is a registered trademark of Allegheny Ladium, Inc.
※ Hastelloy® is a registered trademark of Haynes International, Inc.
| 分類 | 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 material | 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 Equivalent material | Ni-Cr-Mo alloy equivalent to UNS06022, exhibiting excellent corrosion resistance and heat resistance in strongly oxidizing environments. Capable of plastic deformation and forming processes 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. |
※ Hastelloy® is a registered trademark of Haynes International, Inc.
Precautions for material selection
The features of three types of bellows materials commonly used by us are summarized in the following table.
| Material | Corrosion resistance |
Heat resistance |
Lifetime characteristics |
Magnetism |
|---|---|---|---|---|
| SUS316L | ◯ | ◯ 500℃ or less |
◯ | Non-magnetic |
| AM350® Equivalent material |
✕ | ◯ 450℃ or less |
◎ | Magnetic |
| Hastelloy®C-22 Equivalent material |
◎ | ◎ 800℃ or less |
◯ | Non-magnetic |
※ Hastelloy® is a registered trademark of Haynes International,
*Features may vary depending on usage environment.
*Regarding corrosion resistance, materials should be selected according to the fluid used.
*With increasing temperature, the bellows performance deteriorates. Also, since the usable temperature cannot be exceeded, select materials in consideration of maximum operating temperature.
*We also deal with welded bellows materials having magnetism; therefore, caution should be exercised if magnetism can affect the functions of your equipment.
*When considering bellows required to achieve the same axial displacement, there are cases where a more expensive material may prove advantageous.
Glossary of bellows terms
Product Information List
Metal bellows
Vacuum valves
Vacuum equipment
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