What Is 321 Stainless Steel Coil？
321 stainless steel coil is a coiled product made of 321 stainless steel plate or strip through cold rolling or hot rolling. It has good oxidation resistance in high-temperature environments and can withstand oxidation, corrosion, and stress corrosion cracking at high temperatures. At the same time, it contains titanium element, which has good high-temperature resistance and corrosion resistance. Therefore, it is often used in the manufacture of high-temperature equipment and corrosion-resistant equipment, such as manufacturing furnaces, burners, heat exchangers, chemical containers, etc.
|Type||321 stainless steel coil|
|Chemical composition (max)||C ≤ 0.08, Si ≤ 1.00, Mn ≤ 2.00, P ≤ 0.045, S ≤ 0.030, Cr 17.00-19.00, Ni 9.00-12.00, Mo 0.00.|
|Surface Treatment||NO.1/2B/2D/BA/HL/brushed/6K/8K mirror, etc.|
|Yield Strength Rp0.2 (N/mm2)||≥205|
|Tensile Strength Rm (N/mm2)||≥520|
|Hardness||≤200 Vickers hardness (HV) in the annealed state|
The specifications and dimensions in the above table are only common options, and the specifications and dimensions of the actual product can be customized according to your needs.
Two Rolling Processes for 321 Stainless Steel Coils
Hot rolling and cold rolling are two different rolling processes for stainless steel coils, which have different advantages and applicable scenarios in the production of stainless steel coils.
321 Hot Cold Stainless Steel Coil
Cold rolling refers to the process of rolling stainless steel billets at room temperature. The stainless steel billet is first cooled to room temperature after hot rolling or heat treatment. Then, the billet is gradually pressed to the required thickness and width by a cold rolling mill. Because cold rolling provides better dimensional control and surface quality, it is commonly used to produce thinner stainless steel coils or plates.
321 Hot Rolled Stainless Steel Coil
Hot rolling refers to the process of heating and rolling stainless steel billets at high temperatures. First, the stainless steel billet is heated to a higher temperature, usually between 1100°C and 1250°C. Then, the blank is pressed to the desired thickness and width by rolling mills. Processing at high temperatures better alters the structure and properties of stainless steel and is typically used to produce thicker stainless steel coils or sheets.
Advantages of 321 Stainless Steel Coil
As a special stainless steel material, 321 stainless steel coil has many advantages and is favored in many application fields. The main advantages of 321 stainless steel coil are as follows:
Good corrosion resistance: 321 stainless steel coil contains a high concentration of chromium and nickel elements, which makes it have excellent corrosion resistance, can resist the intergranular corrosion and oxidative corrosion that general stainless steel is prone to suffer at high temperatures, and is especially suitable for corrosion resistance demanding environment.
High-temperature resistance: The molybdenum content of 321 stainless steel coil helps to improve the high-temperature resistance strength. Compared with other stainless steel materials, it has stronger stability under high-temperature conditions, can withstand stress and deformation under high-temperature environments, and is not easy to produce brittle fractures.
Good weldability: 321 stainless steel coil has good weldability due to its low carbon content, making it easier to be processed and welded during the manufacturing process, suitable for various welding methods, such as manual arc welding, TIG welding, MIG welding, etc.
Excellent processing performance: Due to the optimization of its chemical composition, 321 stainless steel coils perform well in hot and cold processing, and can be applied to rolling, forging cold drawing, and other processing methods, and can be made into products of various shapes and sizes.
Difference between 304 316 and 321 Stainless Steel
321 stainless steel is a special stainless steel alloy that contains elements such as iron, chromium (Cr), nickel (Ni), and titanium (Ti). There are some notable differences between 304 and 316 stainless steels, and 321 stainless steel coils may have slightly less corrosion resistance in some strong acids and chloride environments than the other two stainless steels. However, it has excellent high-temperature resistance. By adding titanium elements for stabilization treatment, the problems of intergranular corrosion and carbide precipitation at high temperatures can be prevented. Suitable for applications in high-temperature environments such as furnaces, heat exchangers, and high-temperature piping systems. In addition, it also has good antioxidant properties. When choosing a stainless steel coil, it is necessary to fully consider the characteristics of stainless steel according to the specific use conditions and requirements, and choose the most suitable stainless steel product. If you have any needs or doubts in this regard, please feel free to consult us!
What Is 321 Stainless Steel Coil Used for?
Due to its unique performance characteristics, 321 stainless steel coils are widely used in many fields. Here are some application scenarios we recommend:
Heat Exchangers And Heaters In Petrochemical And Chemical Industries:
In the petrochemical and chemical industries, equipment such as heat exchangers and heaters need to run for a long time when dealing with corrosive media and high-temperature fluids, so the manufacturing materials need to have excellent corrosion resistance and high-temperature resistance. The superior performance of just 321 stainless steel coils enables it to resist the erosion of corrosive chemicals and oxides and withstand pressure and deformation at high temperatures. This makes it ideal for manufacturing chemical equipment such as distillation columns, reactors, storage tanks, and piping.
Food Processing Equipment:
321 stainless steel coils are also widely used in the food processing industry. Due to its non-toxic, odorless, corrosion-resistant, and easy-to-clean properties, it is ideal for use in the manufacture of equipment that comes into contact with food. It is often used in the manufacture of food processing lines, food storage tanks, food transportation containers, etc. Its anti-corrosion performance can prevent the chemical reaction of food and metal contact, and ensure the quality and safety of food.
Automobile Exhaust System:
321 stainless steel coil plays an important role in automobile exhaust systems. Since the automobile exhaust system is exposed to high temperature, high pressure, and corrosive gas environment for a long time, it requires materials with good high-temperature resistance and corrosion resistance. The 321 stainless steel coil has excellent high-temperature resistance and corrosion resistance, can withstand expansion and contraction at high temperatures, and resist corrosive substances generated in the exhaust gas, thereby prolonging the service life of the exhaust system.
Component Manufacturing In the Aerospace Field:
In the field of aerospace, the material requirements are very strict, and materials that are resistant to high temperature, high pressure, and corrosion are required. 321 stainless steel coil has excellent high-temperature resistance and oxidation resistance and can withstand extreme working conditions, so it is widely used in the manufacture of parts of aerospace equipment, such as jet engine parts, turbine blades, combustion chamber walls, and other high-temperature parts.
The superior corrosion resistance, high-temperature strength, and durability of 321 stainless steel coils make it an ideal choice in many fields. The above are just some of the application scenarios we have listed. If you have such needs, please feel free to contact us. We will provide you with the most professional advice, the most suitable products, and the best service!
Reasons to Choose GNEE
The Gnee Steel Group is a professional supply chain enterprise, mainly engaged in steel plate, coil, profile, and outdoor landscape design and processing. After 15 years of development, it has become a leading international steel supply chain company in the Central Plains. Relying on many iron and steel enterprises such as Angang Steel, we have a wide variety of products, including shipbuilding plates, pressure vessel plates, bridge decks, etc. We also provide pipes, bars, engineering design and manufacturing, and comprehensive stainless steel solution services. Cooperating with more than 600 companies around the world, the annual export capacity exceeds 80,000 metric tons. Choose Gnee Steel Group, you choose a professional and reliable steel supply chain partner!