Why Should The Seamless Steel Pipe Pickling Process
Why should the seamless steel pipe pickling process
In the rolling of seamless steel pipe, especially in the production of precision seamless steel pipe which, then the acid pickling process is how to do it, do not panic, today immediately opened the mysterious veil for you!
Overview of Seamless Seamless Steel Tube
The use of acid solution to remove iron oxide and rust on the surface of steel is called pickling. (Fe3O4, Fe2O3, FeO, etc.) reacts with the acid solution to form a salt, which is dissolved in the acid solution and is removed. Pickling acid with sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and mixed acid.
Precision seamless steel pipe pickling commonly used medium:
Sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid. In the pickling must be added to pickling corrosion inhibitor, to prevent the corrosion of the metal on the metal.
Precision Seamless Steel Tube Pickling Process
Mainly dipping pickling method, spray pickling method and acid cream derusting method. General multi-purpose dipping pickling method, mass production can be used spray method. Steel parts are generally pickled in 10% to 20% by volume sulfuric acid solution at a temperature of 40 ° C. When the solution iron content of more than 80g / L, ferrous sulfate more than 215g / L, you should replace the pickling solution. At room temperature, with 20% to 80% (volume) of hydrochloric acid solution for acid pickling, less prone to corrosion and hydrogen embrittlement phenomenon. Since the corrosion of the metal on the metal is very large, the need to add corrosion inhibitor. After cleaning the metal surface into a silver white, while passivation of the surface, improve the corrosion resistance of stainless steel. In order to eliminate the adsorption of diatomite carrier surface, to reduce the peak of the chromatographic peak, the carrier before the need for pickling or alkaline washing. Pickling is the carrier with 6mol / L hydrochloric acid for 2h or concentrated hydrochloric acid heating for 30min, filter, washed with water to neutral, drying. Pickling can remove impurities such as iron, aluminum, calcium, magnesium and the like on the surface, but can not remove the silanol group. The pickling carrier is suitable for the analysis of acidic samples.
Precision seamless steel pipe pickling effect
The surface of precision seamless steel pipe degreasing, rust, in order to carry out the next process to prepare. In the production process, the pickling process is to remove the surface oxide, after the lubrication treatment (carbon steel - phosphorus saponification, stainless steel - tallow lime, copper and aluminum - oil), with the old process - copper), then Deep drawing. If the steel pipe is not pickled, the surface may have oxides and oil, phosphating fluid nuclear energy can not be removed, the quality of phosphating will be reduced.