Metal Expansion Joint
 
 
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Metal Bellows Engineering
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Engineering Assistance & Services

INNOVATIVE WORLD WIDE KNOW-HOW, call today for images/design assistance, welding, cleaning, packaging, custom marking, and testing expertise. We offer complete assemblies with end pieces made with precision welding, shielded arc-welding and other process.

Our tests include life cycle, helium leak, hydraulic, pressure, radiography, fluorescent dye penetration, and other metallurgical tests. We are familiar with ASME, ANSI, SVTI-CH, TUV, and other design codes.

Materials
For Temperatures Up To
482°F,250°C
Bronze Cu Sn 6
material standard DIN 2.1020.10

For Temperatures Up To
662°F,350°C
Stainless Steel AISI 316 Ti/316L
material standard DIN 1.4571

For Temperatures Up To
1112°F,600°C
Stainless Steel AISI 321
material standard DIN 1.4541

Other materials include:
Many three hundred series 304, 316, Alloy 600, Alloy 625, C-276, C-22, phosphor, 718, phosphor bronze, and monel.

BOA Instrument Bellows are fabricated from other special materials on request.

Corrosion
It is important that during soldering and cleaning the bellows are not exposed to soldering flux containing chlorides. Steel components, tin plated or treated with soldering flux, must be thoroughly rinsed with hot water and neutralized prior to joining to the bellows. Mere traces of chlorides are likely to attack the normally corrosion resistant austenitic Nickel-Chromium steel, as well as non-ferrous metals.

The same applies to service media for any environment containing chlorides.

In addition, the thin-walled bellows are susceptible to transcrystalline stress corrosion and localized pitting. To deal with potential corrosion, it is recommended to use titanium stabilized AISI 321 stainless steel for higher temperature and AISI 316 Ti for chemical applications. Our metallurgical laboratory has gained extensive experience with corrosion problems and is available for consultation.

   




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