The Production Process of Galvanized Black Steel Pipe?

The time of issue:2013-12-23 8:45:34       Author:

The production process of galvanized black steel pipe generally is: Check the black steel pipes→Hanging material→Degreasing→Rinsing→Pickling→Cleaning→Dipping fluxing agent→Drying hot air→Hot-dip galvanizing→Blowing inside and outside→Cooling→Passivating and Rinsing→Unloading→Inspecting and repairing→Typing logos→Packaging and storage→Transport.

There are several aspects we need to pay attention to make galvanized black steel pipe. 1. Optimization to galvanized sulfates. The most popular advantage of Galvanized sulfates is its current efficiency which can up to 100% and this is what the other galvanizing process unmatched. As the crystalline coating is not detailed enough, the dispersion ability and covering power are poor; therefore it is only suitable for simple geometries such as black steel pipe and wire plating. Sulfates electro galvanized iron alloy process optimize to traditional sulfate galvanizing process, leaving the only main zinc sulfates, the remaining components are discarded. In the new forming process recipe, add a right amount of iron, so that the original single metal plating formed zinc alloy plating. The reorganization of process, not only carry forward the original process's advantages of high current efficiency and quick deposition rate, but also greatly improved he dispersion capability and throwing power. In the past, complex parts can not be plated, now both the simple and complex parts can be plated, and the protective performance have been improved 3-5times of single metal. The production practice shows that continuous plating for wire and black steel pipe, its plated grains is more refined and more bright than original, and the fast deposition rate is bagger. In 2-3mins, the coating thickness can achieve the requirements.

2. Galvanized sulfates conversion. The Galvanized sulfates may be added some sodium hydroxide so as to form insoluble hydroxide precipitates and remove in the plating solution treatment. For organic additives, adds powdered activated carbon adsorption to remove. Tests showed that aluminum sulfate and aluminum potassium sulfate are difficult to completely remove disposable, it has impact on the coating brightness, but not serious, the consume can be brought out. Now the deposit brightness can be restored, according to the new process's component content to add, then the transformation can be completed.

3. Excellent deposition rate and protection performance. Sulfates electro galvanized iron alloy process current efficiency can up to 100%, the fine narrow black steel pipeline's running speed is 8 ~ 12m/min, the average thickness of the coating are 2m/min, this is difficult to achieve in continuous galvanizing. The plating is bright, meticulous and pleasing. According to national standards GB/T10125 "artificial atmospheres test- Salt spray test" method of testing, the plating is intact and unchanged in 72h; the plating surface forms a small amount of white rust in 96h.

4. The unique clean production. Galvanized black steel pipe uses sulfates electro galvanized iron alloy process, it's because between the production line groove and groove are perforated straight, and the solution without any overflow. Each step of the production process is composed by the circulatory system, the solution in the groove such as alkali solution, plating solution, light and passivation solution, etc. only recycled back to reuse, do not leak or discharge to the outside of the system, the production line only set five cleaning tanks, using recycled back reuse and emission regularly.

The welded steel pipe and API steel pipe are also available.

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