Stainless steel knowledge
河南快赢481现场视频 www.hncact.com.cn Edit：handler Date：2019-05-24 18:41 / Popularity：72
What steel is stainless steel?
Stainless steel is a type of steel, and steel refers to steel containing less than 2% carbon (C), more than 2%.
It is iron. The addition of chromium (Cr), nickel (Ni), manganese (Mn), silicon (Si), titanium (Ti), molybdenum (Mo) and other alloying elements in the smelting process improves the properties of the steel and makes the steel resistant to corrosion. (that is, not rust) is the stainless steel we often say.
Second, why do stainless steel have different steel numbers?
In the process of smelting stainless steel, the amount of different alloys is different due to the different types of alloying elements.
The characteristics are also different. In order to distinguish them, different steel grades are crowned. Below are the common decorative stainless steels. The steel alloy "alloy elements" content table is for reference only:
Third, what kind of stainless steel is not easy to rust?
There are three main factors affecting the corrosion of stainless steel:
First, the content of alloying elements, in general, the content of chromium in 10.5% steel is not easy to rust. Chrome nickel
The higher the content, the better the corrosion resistance. For example, the content of nickel in 304 is 8-10%, and the content of chromium is 18-20%. Such stainless steel will not rust under normal conditions.
Second: the smelting process of the production enterprise will also affect the corrosion resistance of stainless steel. The large stainless steel plant with good smelting technology, advanced equipment and advanced technology can guarantee the control of alloy elements, the removal of impurities and the control of the cooling temperature of the billet. The CNC WeChat public company cncdar is therefore stable and reliable in quality and good in internal quality. It is not easy to rust. On the contrary, some small steel mills are backward and the process is backward. During the smelting process, impurities cannot be removed, and the products produced will inevitably rust.
Third: the external environment, the climate is dry and ventilated environment is not easy to rust. The environment with high humidity, continuous rainy weather, or high pH in the air is prone to rust. 304 stainless steel, if the surrounding environment is too bad, it will rust.
Fourth, stainless steel is not magnetic, without magnetic is good stainless steel? If the microstrip is magnetic, isn't it 304?
Many customers go to the market to buy stainless steel, and they bring a small magnet. When they look at the goods, they suck it and think that they can’t suck it.
It is good stainless steel. Without rust, it will not rust. In fact, this is a wrong understanding. The stainless steel belt is not determined by the structure of the magnetic structure. During the solidification process, the molten steel will form "ferrite" due to the different solidification temperature.
Stainless steel of different organizational structures such as "austenite" and "martensitic", in which "ferritic" and "martensitic" stainless steel are magnetic. The "austenitic" stainless steel has better mechanical properties and processability, but only the "ferritic" stainless steel with magnetic properties is stronger than the "austenitic" stainless steel. At present, the so-called 200 series and 300 series stainless steels with high manganese content and low nickel content in the market are not magnetic. CNC WeChat publicly known as cncdar, but its performance is very different from that of high nickel containing 304. On the contrary, 304 is stretched and annealed. Processes such as polishing and casting are also micro-magnetic. Therefore, it is unreasonable to judge the advantages and disadvantages of stainless steel with stainless steel without magnetism. It is also unscientific.