Hospital radiation-proof lead doors are made of lead plate and stainless steel. The thickness of the lead plate determines the radiation protection effect of the lead door. Stainless steel determines the appearance of the lead door, so both are important. We have introduced a lot of lead plates, so let’s introduce it.

 Hospital radiation-proof lead doors are made of lead plate and stainless steel. The thickness of lead plate determines the radiation-proof effect of the lead door, while stainless steel determines the lead door Appearance, so both are important. We have introduced a lot of lead plates, and here is the relevant knowledge of stainless steel.

Stainless steel is made by adding a certain content (usually 10.5%~30%) of chromium on the basis of carbon steel. It has better corrosion resistance and heat resistance than ordinary steel. The surface of ordinary carbon steel will rust quickly. It cannot prevent the isolation of the metal from the medium. The oxygen atoms from the outside will continue to diffuse inward, causing the steel to continue to rust and corrode, leading to complete destruction. The chromium will form a strong and dense oxide film on the surface of the steel, called the "passivation film". This film is extremely thin and transparent, almost invisible to the naked eye, but it can isolate the metal from the external media and prevent the metal from being further corroded; and it also has the ability to self-repair. Once damaged, the chromium in the steel will interact with the media. The oxygen in the gas regenerates the passivation film, which continues to play a protective role. In order to achieve the anti-rust function of steel, the chromium content is generally required to be above 12%. At the same time, in order to enhance the performance, in addition to the higher content of chromium, other alloying elements such as nickel, molybdenum, and manganese are also added to the stainless steel.  

Different alloy ratios constitute different types of stainless steel. The standard composition of 304 series stainless steel is 18%-20% chromium plus 8%-10% rare metal nickel, so it is also called 18/8 stainless steel or 18/10 stainless steel. It is a steel with stable properties and high safety, which is widely used in high-end cookware. Compared with traditional pots such as aluminum pots and iron pots, it has significant advantages in the following aspects: 
1. Durable, has good corrosion resistance, high temperature resistance and fire resistance, and has a longer service life than aluminum pots and iron pots. Therefore, although stainless steel pots are several times or even dozens of times more expensive than ordinary aluminum pots and iron pots, they are worth the money based on the average cost of the service life.  
2. Stable in nature. 18/8 stainless steel will not ooze out when it is heated. It can be used to cook food and can be eaten more assuredly.  
3. Stainless steel cookware has a natural silver luster, no surface treatment such as color plating, no need to worry about color fading, and can show a crystal clear and bright appearance for a long time.  
4. Easy to clean and not easy to adhere to dirt, simple and convenient to clean. Some exquisite stainless steel pots and pans can be cleaned and shiny with just one swipe after use, and it is very easy to take care of. Some friends find that the stainless steel at home is not very clean, especially the oil stains. In fact, this is also a question of whether the material and polishing are good.