Stainless Steel Knowledge (Series 1)

Stainless steel is defined as a high-alloy steel that resists corrosion in the air or in chemically corrosive media. Stainless steel has an aesthetically pleasing surface and good corrosion resistance. It does not require surface treatment such as plating, and it exerts the inherent surface properties of stainless steel. A type of steel in many aspects, usually called stainless steel. Representative performance of 13 chrome steel, 18-chrome nickel steel and other high alloy steel.

From the metallographic point of view, since the stainless steel contains chromium and forms a thin chromium film on the surface, this film separates and invades oxygen from 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 its purpose, chemical composition, and metallographic structure.

The austenite-based steels consist of 18% chromium-8% nickel, and the amount of each element varies, and various steel grades are developed.

Classification by chemical composition:

1CR Series: Ferritic Series, Martensitic Series 2CR-NI Series: Austenitic Series, Abnormal Series, Precipitation Hardening Series.

Metallographic classification:

1 Austenitic stainless steel 2 Ferritic stainless steel 3 Martensitic stainless steel 4 Duplex stainless steel 5 Precipitation hardened stainless steel