[China Aluminum Network] Column-wing radiators made from extruded or die-cast aluminum are not suitable for domestic central heating systems that use hot water, as aluminum is vulnerable to alkaline corrosion. In contrast, steel radiators are more resistant to acidic water conditions. Some people have considered painting the interior of pipes as a way to prevent corrosion, aiming to make the radiator material compatible with the water quality. While internal anti-corrosion treatment may seem like a good solution, it is regarded as a high-tech method in the radiator industry. However, this technique has raised concerns among consumers because it's difficult to accurately assess the quality of the internal coating. As a result, stainless steel and aluminum composite radiators with an all-steel water channel have emerged as a more reliable alternative. These composite radiators require stricter technical standards due to the complex welding process between steel risers and headers, as well as the precise high-pressure liquid expansion of the aluminum profiles.
The steel-aluminum composite airfoil radiator (also known as the all-steel channel product) is a well-regulated type of radiator. According to national regulations, the steel riser must be inserted into the aluminum cavity and joined using hydraulic expansion technology. This ensures that the stainless steel tube expands properly, creating a tight bond between the two materials without any gaps, effectively eliminating thermal resistance. Despite the different expansion coefficients between steel and aluminum, long-term use of these radiators has shown no significant issues, even after over a decade in the market. The hydraulic expansion joint technology has proven effective in maintaining performance and preventing heat loss over time.
Since the introduction of steel-aluminum composite radiators, some industry professionals have predicted that their lifespan could be three times longer than traditional steel radiators, and their mechanical strength could be six times greater than copper-aluminum composites. But what about the price of aluminum alloy composite radiators in Ningbo? Considering that both steel and aluminum are relatively low-cost materials, the production cost isn't particularly high.
During the cold season, the heating system maintains a consistent temperature, ensuring continuous warmth without sudden cooling. As a result, radiators today are performing better on the market. With the entire heating system always operating at high temperatures, there’s no fluctuation between hot and cold. In comparison, steel-aluminum composite radiators currently represent one of the best options available for efficient and durable heating solutions.
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