Basic knowledge of stainless steel
A high-alloy steel that can resist corrosion in the air or in chemical corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatments such as plating, but uses the inherent surface properties of stainless steel. It is used in many A kind of steel, usually called stainless steel. High-alloy steels such as 13 chrome steel and 18-chrome nickel steel are representative of performance.
From the perspective of metallography, because stainless steel contains chromium, a very thin chromium film is formed on the surface. This film isolates the oxygen from the intrusion of the steel and acts as a corrosion resistance.
In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% chromium.
Stainless steel type:
Stainless steel can be roughly classified according to use, chemical composition and metallographic structure.
The austenitic steel is basically composed of 18% chromium-8% nickel, and the amount of addition of each element varies, and steel grades for various purposes are developed.
Classified by chemical composition:
①. CR series: ferrite series, martensite series
②. CR-NI series: austenite series, abnormal series, precipitation hardening series.
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①. Austenitic stainless steel
②. Ferritic stainless steel
③. Martensitic stainless steel
④. Duplex stainless steel
⑤. Precipitation hardening stainless steel
The definition of stainless steel is a high-alloy steel that can resist corrosion in the air or in chemical corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatment such as plating, but takes advantage of the inherent surface of stainless steel. Performance, a kind of steel used in many aspects, usually called stainless steel. High-alloy steels such as 13 chrome steel and 18-chrome nickel steel are representative of performance.
From the perspective of metallography, because stainless steel contains chromium, a very thin chromium film is formed on the surface. This film isolates the oxygen from the intrusion of the steel and acts as a corrosion resistance.
In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% chromium.
Features and uses:
General characteristics
◆ Beautiful surface and diversified use possibilities
◆ Good corrosion resistance, longer durability than ordinary steel
◆ High strength, so the possibility of using thin plates
◆ High temperature oxidation resistance and high strength, so it can resist fire
◆ Normal temperature processing, that is, easy plastic processing
◆ Because there is no need for surface treatment, it is simple and easy to maintain
◆ Clean, high finish
◆ Good welding performance