What are the applications of the flexible joints of the threaded rubber couplings

The inherent corrosion resistance of the rubber joint makes it easy to distinguish from most other metals or alloys. However, the high carbon type 420 and 440 fillet rubber couplings are slightly corroded when nitric acid spot test is conducted. Non-ferrous metals are immediately corroded when they encounter concentrated nitric acid, while dilute nitric acid is intensely corrosive to carbon fillet rubber couplings. Before the point type, the experimental area should be thoroughly cleared of grease or other impurities and polished with a polishing machine or soft cloth to polish a small area, and then the test liquid drops to the polished place, the general silk buckle rubber joint soft joint in a few seconds will constitute a layer of exterior metal copper, while the point test stainless silk buckle rubber joint soft joint appearance is not copper deposits or copper color.
The cut edge of the specimen should be finely ground, and then cleaned and passivated in sulfuric acid with a volume concentration of 20% to 30% and a temperature of 60 to 66 ℃ for half an hour. The sample of 316 and 317 rubber joint is not corroded or corroded very slowly (no bubbles), and the experiment does not change color within 10~15 minutes. If you choose to test together with a known composition of the test to make a close comparison, the experiment can be more accurate. It is easy to manipulate the S content in the rubber joint to less than 0.005%, and the rubber joint can be refined for the second time to reach the purification intention. The product quality is relatively high, the ductile function is good, and the products that do deep punching are generally chosen to exercise in the quenching furnace. Under the effect of induction electric potential, the heated metal induction occurs, through the period, for overcoming the resistance of the metal work occurs heat. Medium frequency furnace use this heat to make the metal heated and melted, so as to reach the intention of melting. Medium frequency furnace can only be carried out once to refine the silk buckle rubber joint soft joint, especially in terms of raw materials can not be sensitive to control. Therefore, the exercise is usually carried out by using stainless steel buckle rubber joint soft joints, waste steel buckle rubber joint soft joints and iron sand.