Summary of commonly used metal materials for bellows expansion joints.(HY- technical centre)

Just received a call to consult the corrosive material corrosion problem, take this opportunity, HY-industry also summarizes the common materials of the bellows.

The metal bellows is a kind of corrugated tube, so it is called bellows, also called expansion joint or expansion joint. Mainly used for non-concentric axial transmissions requiring small bending radii, or irregular turning, telescoping, or thermal deformation of the absorbing pipe, or inconvenient to connect pipes to pipes with fixed elbows, or pipes and The connection of the device is used. Today, HY will talk to you about the bellows.

Metal bellows are widely used in automatic control and measuring instruments, vacuum technology, machinery industry, power industry, as sensitive components, shock absorbing components, non-concentric axial transmission components, compensation components, sealing components, valve components and pipeline connectors. Transportation and atomic energy industries.

Metal bellows are made of different metal materials depending on their application. Due to the different materials, the performance and use of the metal bellows processed are also different. Commonly used metal bellows are carbon steel, copper, and stainless steel, as well as steel-lined, aluminum, and the like.

superalloy bellows expansion jointsAccording to different fields of use, HY summary metal bellows commonly used materials are as follows:

Tin bronze

Bellows QSn6.5~0.1 X -60°C~+100°C Excellent elasticity, strength and corrosion resistance, low hysteresis and elastic aftereffect, good brazing property, widely used as measuring components.


Bellows H80 H -60°C~+100°C Low elasticity, large hysteresis and aftereffect, good brazing. It can be used as a measuring component in non-corrosive media and in low precision instrumentation.

Bronze bronze

stainless bellows expansion jointsBellows QBe2 P -60 ° C ~ +150 ° C with small hysteresis and elastic aftereffect, high elasticity stability, corrosion resistance, non-magnetic. It is mostly used in high-precision measuring instruments.

Stainless steel

Bellows 1Cr18Ni9Ti G -194°C~+400°C has high bending fatigue strength and corrosion resistance, and has good welding performance. It can be used as a measuring, sealing, joining and compensating element in corrosive media. Commonly used grades 304, 304L, 316, 316L, 317L, 310S, 321 and so on.

Special ones with high degree of corrosion need to consider 6Mo special stainless steel, also called super stainless steel such as 254SMO, 904L, N08367 or N08926.

Nickel alloy

bellows expansion jointsFor special working conditions, especially corrosion and high temperature, consider the use of chloride ion-resistant, seawater, acid-base corrosion and high temperature resistant alloy materials such as high nickel alloys, nickel-chromium-iron alloys such as INCOLOY800H, INCOLOY825, INCONEL625, Mone400 and Hastelloy. Materials such as C-276.


Generally speaking, it is pure titanium, GR.1 grade, high elongation, pay attention to welding problems.

Duplex steel

The elongation is poor and the strength is high. Generally speaking, small bellows are not recommended. Large bellows can be selected, but it is necessary to properly consider the processing problems according to technical conditions.

HY-industry is qualified  Nickelalloy&cobalt alloy materials supplier.

We have more than twenty years experience in kind of High temperature alloy production.

Monel 400,Stellite 6,Stellite 12,Incoloy 800ht,Nimonic 80A,Kovar,Invar 36,Inconel 625,Hastelloy C276, Incoloy 825 are mature productes of us.

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