In recent years, the development of steel radiators has been rapid, and the aesthetics, decoration and functionality have greatly enriched the use requirements of radiators. At present, there are many steel pipes with low prices on the market, and many fish are incompatible with each Other. In order to reduce costs, many of the market are produced using materials that do not meet the material requirements. Some use cold-worked hard strip steel to directly produce steel pipes, or some meet the requirements of a single specification. Protection, still producing a black oxide layer on the surface, reducing the adhesion of the coating, greatly reducing the corrosion resistance and reducing the service life. Residual stress caused by uneven cooling of the material makes it resistant to deformation, stability and fatigue, and the pressure is unstable. After the radiator is produced, the user generally cannot identify it. After removing the oxidation, after the gas protection annealing, the bright strip has no oxidation on the surface, good finish, uniform annealing temperature, stable intergranular structure and strong anti-deformation ability, which greatly improves the service life of the steel tube.
To improve product quality and strictly regulate market behavior, it is necessary to ensure the quality requirements of products with standardized manufacturing processes. The material used for the raw materials was Q195 high-quality material, which is stable and reliable and meets the requirements of quality standards. Strict implementation of production standards, each production process is strictly in accordance with standard production. The iron oxide scale on the surface of the hot rolled strip is usually a three-layer structure, the outer layer is Fe203 (ferric oxide), the middle layer is Fe304 (triiron tetroxide), and the inner layer is Fe0 (iron oxide). In order to ensure that the pipe material meets the product requirements, the strip steel is first peeled off to remove the surface iron oxide, the middle layer of iron oxide such as ferroferric oxide, and then subjected to continuous pickling treatment, and pickled by a high-speed continuous pickling machine. The hydrochloric acid concentration is 15-20%, and the pickling temperature is controlled from room temperature to 40 °C. The strip was continuously pickled through several pickling tanks. The residual of the surface layer and the ferrous oxide of the inner layer are sufficiently removed, and then subjected to alkali neutralization and sodium nitrite preservation treatment. The strip is subjected to cold rolling and rolling, and the strip is subjected to rough rolling, medium tying and fine boring. According to the strip thickness and plasticity, it is suitable for the distribution pass reduction rate, and the continuous high speed rolling is adopted to ensure the good plate of the strip. Shape, control the thickness deviation of the strip, generally not more than 0.01-0.03mm or even smaller. The surface quality of the cold-rolled strip is superior, and there are no defects such as pitting, indentation, and intrusion into the scale. And has good mechanical properties and process properties (such as higher strength, lower yield limit, good deep drawability, etc.). Finish rolling is the final step of cold rolling, mainly to control the mechanical properties and process properties of the finished product, to control the precise thickness of the finished product and the good shape of the plate to obtain high quality performance and surface state of the product. Before the finish rolling, the strip steel reduces the hardness of the strip, eliminates the cold work hardening, eliminates the residual internal stress in the steel, restores the plastic deformation ability of the strip, uniformly and stabilizes the structure and chemical composition of the strip, and re-anneals the strip steel. The equipment is nitrogen-protected ammonia decomposition electric annealing furnace, the annealing process is placed in a protective atmosphere, the furnace is vacuumed, and 99.95% nitrogen-hydrogen mixed high-purity gas provides annealing-protected hot carbon. Due to the convection circulation of the protective gas in the furnace, the furnace temperature is uniform, which can effectively ensure that the annealing materials at any position are soft and hard. After the bright-annealed strip is subjected to finish rolling, a bright strip with a smooth surface, uniform thickness and good shape is produced. In the welded pipe link, according to the specification requirements, the error limit is adjusted to form and sizing, and the computer cuts the fixed length. In order to ensure the welding quality of the weld, our company adopts the more advanced third-generation all solid-state frequency welding technology. In the past, the high-frequency welding of the tube was used, the waveform was unstable, and the output heat was unstable, which caused the weld to be over-melted and under-melted, resulting in false welding and karst, and the quality of the weld was significantly reduced. The solid-state high-frequency power supply is multi-stage filtering, the waveform is stable, the power is stable, and the weld seam is more stable. According to the operation instructions, the welding temperature should be changed without any sudden change, no spark splash, so that the heating temperature of the weld joint is uniform, which ensures that the oxide inclusions at the weld are completely removed, and the over-melting and under-melting of the weld are prevented. To ensure the consistency of the weld and the base metal composition. Adjust the current according to the operation instructions, and master the welding speed and temperature. The production of advanced specifications guarantees quality requirements such as drawing, flattening, flare, water pressure, etc., and energy saving and water saving benefits are remarkable.
In all production steps, strict and precise processing precision requirements, in accordance with standardized production organization implementation, strict tooling, process requirements, strict control of key links, to ensure the quality of steel pipe products, to avoid the use of coatings off, corrosion resistance, The pressure bearing capacity is strengthened, and the weld seam leakage is prevented, thereby improving the service life.
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