The definition, classification, role and advantages of stainless steel are as follows:

Definition: Stainless steel is a kind of weak corrosive medium such as air, steam, water or stainless, acid-resistant alloy steel 
Classification: There are many types of stainless steel, such as austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, austenitic ferritic (duplex) stainless steel, precipitation hardening stainless steel, etc. 
Functions:
Construction and decoration: often used to make doors and Windows, railings, stair railings, elevator doors, etc. 
Kitchen utensils: POTS, bowls, knives, stoves, etc. 
Medical instruments: surgical instruments, operating tables, operating lights, medical instruments, etc. 
Chemical industry: production of storage tanks, pipelines, pumps and other chemical equipment 
Food processing: food processing equipment such as food mixers, storage tanks, conveyor belts, etc. 
Automotive industry: for the production of automobile shell, exhaust system, body parts, etc. 
Advantages:
Corrosion resistance: It can resist the erosion of most chemical media, including acid, alkali, salt, etc. 
High strength: has a high strength, to meet the needs of different applications 
High temperature resistance: Some stainless steel alloys can maintain structural stability and strength at high temperatures 
Hygiene: Smooth surface, not easy to attach bacteria and dirt, easy to clean and disinfect 
Aesthetics: can be used in architectural decoration, furniture manufacturing and art production fields 
Environmental protection: Waste stainless steel can be recycled and reused to reduce resource waste and environmental pollution.
Wear resistance: Maintains its surface integrity and durability under conditions of friction and wear