Some misunderstandings of stainless steel material identification
1, the magnet on the sucker must not be stainless steel.
This is the biggest misunderstanding in the hearts of the Chinese people! It can be said that if you go to any hardware vendor, the boss will tell you so. If you believe, then you are actually wrong. Magnets do not necessarily absorb stainless steel. (Note that there are three nonsense words in this sentence.) Stainless steel can be divided into many types. Among them, the commonly used methods include austenite, ferrite, two-phase, martensite, precipitation hardening, etc. (Do not ask me these terms.) What do you mean, remember on the list, these are metallurgical terms.) Of these, only austenitic stainless steels are non-magnetic, but these stainless steels account for most of the stainless steel market (previously more than 70%, and now only an estimated 60%, to the next 50%), the most widely used. The other iron and steel materials are magnetic, which is the reason that the Chinese domestic market uses magnetic discrimination stainless steel. However, other types of stainless steel are magnetic. For example, many times you try high-end restaurants using magnets to try shiny stainless steel knives and forks. They are often magnetic. In fact, it is likely to be martensitic stainless steel. There are also auto exhaust pipes. Stainless steel is also magnetic. It is ferritic.
Austenitic stainless steels are often added with Ni. At present, the price of Ni is high in the world. Therefore, the main trend of stainless steel is how to save nickel. One of the best ways is to develop excellent ferritic stainless steel and two phases. Therefore, in the future, there will inevitably be more stainless steel that can absorb magnets.
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A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by José Antonio de Alzate y RamÃrez, a Mexican priest and scientist, who described the device in 1790 in the Gaceta de Literatura Méxicana.[1] It consists of a valve connected to a hollow sealed float by means of a lever, mounted near the top of the tank. The float is often ball-shaped, hence the name ballcock. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control.
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