corrugation

metal bellows

DN50-DN500
Metal bellows are flexible tubular components made of stainless steel, carbon steel, alloy steel and other metallic materials, formed by hydraulic or mechanical corrugation.With excellent elastic deformation performance, they can absorb axial, lateral and angular displacement generated by thermal expansion, equipment vibration and installation errors of pipelines.They also function as sealing, vibration isolation and noise reduction parts, widely applied in petrochemical, power, metallurgy, shipbuilding, HVAC and aerospace industries.Common types include seamless metal bellows and welded metal bellows, featuring high pressure resistance, corrosion resistance and long service life.
Delivery
EXW
minimum order
10 pieces
Supply Ability
50pieces / Week
Country of Origin
CHINA
Stock Time
14Day
Quantity:
US $10.00 - US $1000.00 / pieces
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Product Description

Metal bellows are flexible, corrugated tubular components made from thin-walled metal alloys, engineered to absorb displacement, vibration, and thermal expansion in industrial pipeline systems and mechanical equipment. Their unique accordion-like structure enables axial, lateral, and angular flexibility while maintaining high pressure resistance and durability, making them a core component in sectors such as petrochemicals, power generation, aerospace, and HVAC.

Core Structure & Material Selection

  1. Corrugated Tubular BodyThe main structure is formed by precision hydroforming, mechanical forming, or welding of metal sheets. The corrugated design provides the flexibility needed for displacement compensation. Common materials include:
    • Stainless Steel: SS304 (general corrosion resistance), SS316L (enhanced corrosion resistance for acids/alkalis), SS321 (high-temperature stability).
    • High-Performance Alloys: Hastelloy, Inconel, Monel (for extreme corrosive, high-temperature, or cryogenic environments).
  2. Reinforcement & End Fittings
    • External Braid Layer: Optional stainless steel wire braid, which restricts radial expansion under internal pressure, improves pressure-bearing capacity, and protects the bellows from external impact.
    • End Connectors: Customizable flanges, threaded joints, or welded ends, matched to the bellows material to ensure structural integrity and sealing performance.

Key Technical Features

  1. Multi-Dimensional Displacement CompensationMetal bellows can accommodate axial elongation/compression (±10% of length), lateral offset (±5-30mm), and angular deflection (±5°-20°), effectively relieving pipeline stress caused by thermal expansion, installation misalignment, and equipment vibration.
  2. Wide Temperature & Pressure Adaptability
    • Temperature Range: From -270ºC (liquid helium cryogenic conditions) to 1200ºC (high-temperature steam environments), depending on the alloy material.
    • Pressure Rating: PN0.1-PN420 (Class 150-Class 2500), suitable for low-vacuum systems to high-pressure hydraulic/pneumatic pipelines.
  3. Excellent Corrosion & Fatigue ResistanceAlloy materials resist corrosion from most industrial media (except for strong oxidants or specific corrosive agents). The optimized corrugated structure ensures fatigue resistance, withstanding millions of expansion-contraction cycles without failure.
  4. High Sealing PerformanceSeamless forming or laser welding processes eliminate leakage points. For high-purity or hazardous media, metal bellows can be designed with hermetic seals to meet strict leakage standards.
Detailed Photos

FAQ
a) How can I get more details about your products?
You can send an email to our email address. We will provide catalogue and pictures of our products for your reference.We can also supply pipe fittings, bolt and nut, gaskets etc. We aim to be your piping system solution provider. 
b) How can I get some samples?   
If you need, we will offer you samples for free, but new customers are expected to pay express charge. 
c) Do you provide customized parts? 
Yes, you can give us drawings and we will manufacture accordingly. 
d) To which country have you supplied your products?
We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru , Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.). 
e) I can't see the goods or touch the goods, how can I deal with the risk involved?  
Our quality management system conforms to the requirement of ISO 9001:2015 verified by DNV. We are absolutely worth your trust. We can accept trial order to enhance mutual trust.