- 商品名称: Corrugated Metal Bellows
Metal corrugated expansion joints (also known as corrugated compensators for short expansion joints) are designed and manufactured according to the EJMA standard of the American Expansion Joint Manufacturers Association and the GB/T12777-99 standard. It is a device with compensation function composed of metal bellows and structural parts. It can compensate the thermal deformation and mechanical deformation of the pipeline and absorb various mechanical vibrations, so as to reduce the deformation stress of the pipeline and improve the service life of the pipeline. Compared with tension expansion joints, sleeve expansion joints and spherical expansion joints with the same compensation ability, it has the advantages of small footprint, simple installation, low engineering cost, no structural leakage, and no maintenance. Widespread adoption and rapid development.

Displacement direction: axial (a small amount of lateral, angular)
Working pressure: (MPa) 0.6, 1.0, 1.6, 2.5
Nominal diameter: DN15 ~ DN12000
The expansion joint is composed of a bellows and structural parts, and is mainly used to absorb axial displacement and a small amount of lateral and angular displacement. It has a simple structure and low cost. It is also called a universal compensator.

Compensator selection guide
Before selecting the compensator, first divide the piping system into simple and independent expansion pipe sections with fixed brackets (or intermediate fixed brackets), such as straight pipe sections, "L"-shaped elbow sections, and "Z"-shaped elbow sections etc., and then select one of the types of compensators according to the following block diagram.

Field installation case of metal corrugated compensator
- Corrugated Metal Bellows

Select bellows material according to media conditions

介质	波纹管材料	备注（相当国内材料牌号）
空气	SUS304，316	SUS304 相当于 0Cr18Ni9 SUS316 相当于 00Cr17Ni12Mo2 SUS316L 相当于 00Cr17Ni14Mo2
热空气	SUS316，316L
二氧化硫	SUS316，316L
蒸汽	SUS316，316L
水	SUS304
石油	SUS316，316L
海水	SUS316，316L( 内衬聚四氟乙稀 )
煤气、液化石油气	SUS304，304L，316，316L
热交换器	SUS304，304L，316，316L，321 INCONEL600，625，INCOLOY800，800，825
催化、裂化高温装置	INCONEL600，625，INCOLOY800，800H，SUS321

Select bellows, connecting pipe, flange material according to working temperature

零件	温度	-45~-5	-5~350	350~450	450~600	＞ 600
	波纹管	304，316	304,316	304,316,321	321,INCONEL	INCOLOY
	接管、法	16Mn,20	Q235-A,20	16MnR,20g	304,316	304,321

Chemical composition and mechanical properties of bellows materials

材料	化学成分
材料	C	Si	Mn	Ni	Cr	Mo	P	S	其他
SUS304	≤ 0.08	≤ 1.00	≤ 2.00	8.00-20.00	18.00-20.00	—	≤ 0.045	≤ 0.03
SUS304L	≤ 0.03	≤ 1.00	≤ 2.00	9.00-13.00	18.00-20.00	—	≤ 0.045	≤ 0.03
SUS316	≤ 0.08	≤ 1.00	≤ 2.00	10.00-14.00	16.00-18.00	2.00~3.00	≤ 0.045	≤ 0.03
SUS316L	≤ 0.03	≤ 1.00	≤ 2.00	12.00-15.00	16.00-18.00	2.00~3.00	≤ 0.045	≤ 0.03
SUS321	≤ 0.08	≤ 1.00	≤ 2.00	9.00-13.00	17.00-20.00	—	≤ 0.045	≤ 0.03	Ti ≥ 5×C%

材料	固溶热处理温度℃	常温机械性能
		拉伸			硬度
		δ 0.2Mpa	δ bMpa	δ5%	H	RB	HV
SUS304	1010~1150 淬火	≥ 206	≥ 520	≥ 40	≤ 187	≤ 90	≤ 200
		≥ 177	≥ 481
SUS316		≥ 206	≥ 520
SUS316L		≥ 177	≥ 481
SUS32	920~1150 淬火	≥ 206	≥ 520