Stainless steel pipe definition

A kind of high-alloy steel that can resist corrosion in the air or chemically corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatment such as color plating but can utilize the inherent surface properties of stainless steel and is used in many applications. A type of steel is often called stainless steel. Representative performance includes 13-chromium steel, 18-chromium-nickel steel, and other high alloy steels.

From a metallographic perspective, because the stainless steel pipe contains chromium, a very thin chromium film is formed on the surface. This film isolates the oxygen that intrudes into the steel and plays a role in corrosion resistance. To maintain the inherent corrosion resistance of stainless steel pipes, the steel must contain more than 12% chromium. Types of stainless steel pipes: Stainless steel can be roughly classified according to its use, chemical composition, and metallographic structure. Austenitic steel is composed of 18% chromium-8% nickel. The additional amount of each element changes, and steel types for various purposes are developed. Classified by chemical composition:
①CR series: ferrite series, martensite series
②CR-NI series: austenitic series, abnormal series, precipitation hardening series.
Classification based on metallographic structure:
①Austenitic stainless steel pipe
②Ferritic stainless steel pipe
③Martensitic stainless steel pipe
④Duplex stainless steel pipe
⑤Precipitation hardened stainless steel pipe