Cleaning is very important for the flange itself, because if there is rust or dirt on the surface of the flange, it will damage the flange itself, and may even affect the overall pipeline transportation, so that the pipeline leakage. Today, Hebei Flange factory will take you to master some cleaning problems about carbon steel flanges.
Carbon steel flange cleaning problem
In the processing of metal properties, in order to facilitate the cold heading and tapping, phosphoric acid coating is applied, and the heat treatment process is directly carried out without dipping. It is then cooled in quenching oil, cleaned with alkali detergent, and tempered at 400 ° C.
In this state, the screws appear red, which is also caused by caustic soda. Here it can be tested that the alkali detergent is rich in calcium compounds and fluoride. The carbon steel flange is burned during the heat treatment process, and the surface of the carbon steel flange has imprint.
Black lines are common in carbon steel flanges. Carbon steel flanges cleaned with inorganic detergent and organic detergent before heat treatment process can also see black lines after quenching.
Even if the heat treatment process is carefully cleaned before the heat treatment process, there will be lines after the heat treatment process. Infrared spectrometers were used to analyze the remnants of the surface, and the conclusion was that the concentration of calcium and sulfur was relatively high.
Hebei Flange factory uses acetone with less acetic acid, hard to fold small experimental filter paper, leaving black spots on the filter paper. The filter paper was analyzed by infrared spectrometer to check its main elements.
There are calcium and sulfur in the rust, indicating that these substances are sintered quenching oil, and there is the progress of gas phase in the quenching process. In view of excessive aging of quenching oil, it is proposed to introduce old oil, add new oil, and carry out process supervision and maintenance of quenching oil during the whole process cycle.
Performance of flange
They also have good sealing properties and flexibility. They do not affect each other in the process of working. All you need to do is open a steel pipe.
This special function allows carbon steel flanges to reduce certain losses caused by sudden disasters to a lower degree during use, which is more suitable for pipeline maintenance work.
When the tooling is clamped on the workbench, the flange plane to be processed should be concentric and parallel to the table of the vertical lathe, and the tooling should be able to change the clamping position to ensure that the flange of the 2 ends of the elbow can be processed on a tooling, which is to reduce the number of tooling.
At the same time, the tooling needs to have enough rigidity, otherwise it will seriously affect the processing quality of the flange sealing ring groove.
