Stainless steel coils are divided into austenitic, ferritic, martensitic, duplex stainless steel cold-rolled coils and stainless steel hot-rolled coils. The implementation standards include GB/T4238, ASTM/ASME, JIS G4305, EN10088, BSEN10028, GB/T3280 , GB/T4237, etc.

In order to ensure that the mechanical properties such as yield strength, tensile strength, elongation and hardness of various stainless steel coils meet the requirements, stainless steel coils must undergo heat treatments such as annealing, solution treatment, and aging treatment before delivery. The corrosion resistance of stainless steel coils mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, etc.) and the internal structure of stainless steel coils, and the main role is chromium. Chromium has high chemical stability and can form a passivation film on the steel surface to isolate the metal from the outside world, protect the steel coil from oxidation, and increase the corrosion resistance of the steel coil. After the passivation film is destroyed, the corrosion resistance decreases.

Stainless steel coils are widely used in chemical industry, food, medicine, papermaking, petroleum, atomic energy and other industries, as well as various parts of construction, kitchen utensils, tableware, vehicles, household appliances, etc.

Stainless steel coil surface marks and corresponding features 

Application industries of stainless steel:

Stainless steel is widely used, from construction to automobiles, from transportation to storage, from industrial production to household appliances, basically covering all walks of life.

1. Automobile industry

The automotive industry is a relatively developed application field for stainless steel sheets. Using high-strength stainless steel plate as the raw material for the car body structure can greatly reduce the weight of the vehicle and enhance the strength of the overall structure of the vehicle. If the vehicle panel is made of stainless steel plate, it can effectively save maintenance costs. In addition, stainless steel sheets are used in the production of automotive exhaust systems due to their good resistance to chloride ion corrosion and heat resistance. European and American countries are using a large number of stainless steel plates as raw materials for automobile production. 

2. Construction industry

The application of stainless steel coils in the field of construction has a long history and is widely used. In terms of construction and home decoration, stainless steel coils are often used in the exterior walls of high-rise buildings, indoor and outdoor columns. In addition, there are internal and external components such as handrails, elevator panels, doors and windows. In addition, the surface treatment of stainless steel plates is also very advantageous in the construction and home decoration industries, such as the coloring and coating of stainless steel plates, which can solve the problem of easy fingerprints after touching and improve the decorative aesthetics. 

3. Home appliance business

In the household appliance industry, the consumption of stainless steel is also very large. For example, the inner cylinder of automatic washing machines, the inner tank of water heaters, the inner shell of microwave ovens, the lining of refrigerators, etc., which are common in our lives, are all made of stainless steel. Household appliances usually use ferritic stainless steel coils as raw materials.

4. Water industry

There is now increasing concern about the possible contamination of water during storage and transportation. Practice has shown that stainless steel coils are very suitable as raw materials for water industry equipment such as water production, storage, transportation, purification, regeneration, and seawater desalination. Its advantages are: corrosion resistance, shock resistance, water saving, sanitation (no rust and patina), light weight (1/3 reduction), less maintenance, long service life (can be used for 40 years), low life cycle cost (LCC), It is a recyclable green environmental protection material. 

5. Industrial facilities

The proportion of stainless steel coils used in industrial facilities in developed countries can usually reach 15%-20%. Stainless steel coils are used in chemical, petrochemical, chemical fiber, papermaking, food, medicine, energy (nuclear power, thermal power, fuel cells) and other fields. 

6. Environmental protection industry

Stainless steel coils are not only used in industrial production, but can also be used as raw materials for industrial waste gas treatment equipment, garbage treatment equipment, and sewage treatment equipment. In the flue gas desulfurization process, in order to resist the corrosion of sulfur dioxide, chloride ions and iron ions, it is necessary to use duplex stainless steel coils and high-grade austenitic stainless steel in the absorption tower, cooler, pump, valve, flue and other waste incinerators Coils, wastewater treatment and other facilities require high performance stainless steel coils.