Knowledge of stainless steel

Knowledge of stainless steel
Definition of stainless steel
In air or chemical corrosion resistant to corrosion in the medium of a kind of high alloy steel, stainless steel is a beautiful surface and corrosion resistant performance is good, don't have to color after plating surface treatment, such as performance and exert inherent in the stainless steel surface, used in a various iron and steel, often referred to as stainless steel. On behalf of the performance of 13 chrome steel, 18 - chromium-nickel steel high alloy steel.
From the perspective of metallography analysis, for stainless steel contain chromic and make the surface very thin Chromium membrane, the membrane is isolated from intrusion in the steel corrosion of oxygen.
In order to keep the inherent corrosion resistance of stainless steel, steel must contain more than 12% of chromium.
Stainless steel type:
Stainless steel can be use, chemical composition and microstructure to general classification.
With austenite system class chrome steel by 18% - 18% of nickel as the basic form, change the dosage of each element, steel grade and develop all sorts of purposes.
(1). CR series: series of ferrite, markov system
(2). CR - NI series: austenite system, abnormal series, series of precipitation hardening.
In the classification of the microstructure:
1. Austenitic stainless steel
(2). Ferritic stainless steel
(3). Martensitic stainless steel
(4). The duplex stainless steel
5. The precipitation hardening stainless steel.