Processing requirements and application of steel radiator pipe
American Garage Door,Electric Garage Doors,Black Garage Door,Bifold Garage Door Lemon Building Material Co., Ltd. , https://www.lemonbuilding.com
July 05 09:34:23, 2025
In recent years, the development of steel radiators has accelerated rapidly, with significant improvements in aesthetics, design, and functionality to meet modern user demands. However, the market is flooded with low-quality steel pipes that often fail to meet required standards. Some manufacturers use substandard materials, such as cold-worked hard strip steel, to cut costs. These materials may not fully satisfy specifications, leading to surface oxidation, poor coating adhesion, reduced corrosion resistance, and a shorter service life.
Uneven cooling during production can create residual stresses, which affect the pipe’s deformation resistance, stability, and fatigue performance, resulting in unstable pressure levels. Most users are unable to detect these issues at first glance. However, after removing the oxide layer through gas protection annealing, the bright strip shows no surface oxidation, a smooth finish, uniform temperature distribution, and a stable microstructure, significantly enhancing the durability of the steel tube.
To ensure product quality and regulate the market effectively, it is essential to follow standardized manufacturing processes. High-quality Q195 material is used as the raw material, known for its stability and compliance with quality standards. Each step of the production process is strictly controlled to meet industry requirements.
The hot-rolled strip typically has a three-layer oxide scale: Fe₂O₃ on the outer layer, Fe₃O₄ in the middle, and FeO on the inner layer. To improve quality, the surface oxides are removed through peeling and continuous pickling using a high-speed machine. The hydrochloric acid concentration ranges from 15% to 20%, and the temperature is maintained between room temperature and 40°C. After pickling, the strip undergoes alkali neutralization and sodium nitrite preservation treatment.
The strip then goes through cold rolling, including rough rolling, intermediate rolling, and finishing. The reduction rate is adjusted based on the strip thickness and plasticity, ensuring high-speed rolling for consistent shape and thickness control—typically within 0.01–0.03 mm. The cold-rolled strip exhibits superior surface quality, free from defects like pitting or scaling, and offers excellent mechanical properties, such as higher strength, lower yield point, and good deep-drawing capabilities.
Finish rolling is the final stage, where mechanical properties and surface quality are optimized. Before this, the strip undergoes re-annealing in a nitrogen-protected furnace to reduce hardness, eliminate cold work hardening, and stabilize internal structure. This ensures uniform softness and structural consistency across the entire strip.
In the welding process, precise adjustments are made to meet size specifications, and computer-controlled cutting ensures accurate lengths. Our company uses advanced third-generation solid-state frequency welding technology, which provides more stable waveforms and power output compared to traditional high-frequency welding. This reduces the risk of over-melting or under-melting, minimizes weld defects, and ensures a consistent composition between the weld and base metal.
Throughout all production stages, strict precision and quality control measures are implemented. Standardized processes, tooling, and critical control points ensure reliable steel pipe products, improving corrosion resistance, pressure capacity, and preventing weld leakage. This ultimately extends the lifespan of the radiators and enhances their overall performance.