Cold rolled stainless steel coil & sheet is a metal sheet product, which is processed by cold-rolling stainless steel hot-rolled coils. Cold rolling is a metalworking method by which hot-rolled sheets are further processed and adjusted at room temperature to change their dimensions, surface quality, and mechanical properties.
200 series stainless steel coils exhibit a combination of features that make them a versatile choice in numerous industries. Here are some of the key features of these coils:
Affordability: 200 series stainless steel coils are cost-effective mainly because of their lower nickel content, substituted by manganese. This makes them a popular choice in a variety of applications where cost is a significant factor.
Strength and Hardness: Compared to other stainless steel series like 300 series, the 200 series stainless steel tends to have a higher strength and hardness. This means it can withstand more wear and tear, making it ideal for certain industrial applications.
Formability: 200 series stainless steel is known for its formability. This means it can be easily manipulated into various forms without losing its strength or integrity, making it useful in applications that require a lot of shaping and forming.
Magnetic Properties: Unlike 300 series stainless steels, 200 series stainless steels are generally magnetic due to their higher ferrite content.
Weldability: 200 series stainless steels generally have good weldability.
Corrosion Resistance: While they have a good resistance to corrosion, they are less resistant than 300 series stainless steels. The specific level of corrosion resistance can vary greatly depending on the exact alloy and the environment in which the steel is used.
Applications of these coils include appliances, kitchen utensils, architectural features, automotive parts, and more. However, it’s important to note that the exact properties can vary depending on the specific alloy within the 200 series and the processing techniques used. For certain applications that require extreme corrosion resistance, higher series like 300 or 400 may be more suitable.
Manufacturing stainless steel, including the 200 series, involves several stages that turn raw materials into the final product, a stainless steel coil in this case. Here is a simplified version of the process:
Melting and Casting: The raw materials, which are primarily iron ore, chromium, silicon, nickel, carbon, nitrogen, and manganese, are melted together in an electric furnace. This process takes about 8 to 12 hours. Once everything is melted and combined, the molten steel is cast into semi-finished forms, such as slabs, blooms, or billets.
Forming: For the production of coils, slabs are the most commonly used semi-finished product. The slab is heated and then sent through a series of rollers to reduce its thickness and form it into a long, thin strip.
Cold Rolling: The strip is then further reduced at room temperature to the required thickness. This is a more precise method for getting the strip to the exact thickness and also enhances the strength and formability of the steel.
Annealing: After cold rolling, the steel is annealed. This involves heating the steel in a solution of acid, and then rinsing it, which removes any scale that might have formed during the heating process. Annealing also helps to restore the mechanical properties of the steel that have been altered during cold rolling.
Cutting to size: Once the steel has been annealed and passed through a final skin pass mill, it’s cut into large coils according to the desired width and weight of the coil.
Descaling: Throughout the processing, scales (a form of rust or iron oxide) can form on the surface of the steel. These scales are removed using various descaling techniques like pickling or shot blasting.
Finishing: Finally, the steel is given its final finish. This can involve further reducing its thickness, applying protective coatings, or treating it to alter its physical properties. The finish will depend on what the final product will be used for.
It’s worth noting that the specific processes, temperatures, and times used can all vary depending on the exact composition of the steel and what the manufacturer’s goals are for its properties.
The 200 series stainless steel coils are widely used across different industries due to their balance of performance and cost. They offer good mechanical properties and corrosion resistance, which makes them suitable for a variety of applications, especially where cost-effectiveness is an important factor.
Here are some of the main applications of 200 series stainless steel coils:
Kitchen Utensils: One of the most common uses of 200 series stainless steel is in the manufacturing of kitchen utensils. This is because they are resistant to corrosion and can be easily cleaned. It’s also commonly used in cookware and cutlery.
Appliances: 200 series stainless steel is also commonly used in home appliances, such as refrigerators, washing machines, dryers, and dishwashers due to its corrosion resistance, durability, and aesthetic appeal.
Automotive Components: The high strength-to-weight ratio of 200 series stainless steel makes it ideal for certain automotive components. It can also be formed into various shapes, making it versatile for a variety of parts.
Building and Construction: In the building and construction industry, 200 series stainless steel is often used for cladding, handrails, door and window fittings, street furniture, structural sections, reinforcement bar, lighting columns, lintels, and stone supports.
Industrial Machinery: Various types of industrial machinery and equipment also utilize 200 series stainless steel due to its corrosion resistance and high strength.
Food and Beverage Industry: The food and beverage industry uses 200 series stainless steel in food processing equipment, brewery equipment, and kitchen benches.
Remember that while the 200 series offers good corrosion resistance, it is less resistant than the 300 series, so it may not be suitable for environments with high corrosivity. The specific alloy and processing techniques can also affect the properties of the steel, so it’s important to choose the right type for the specific application.
Standards for cold rolled stainless steel coil & sheet vary from country to country. The following are some common Chinese, British, American and Japanese national standards:
Chinese standard:
GB/T 24511-2017 " Stainless steel and heat resisting steel plate,sheet and strip forpressure equipments"
British Standard:
BS EN 10088-2:2014 "Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes"
American standard:
ASTM A240/A240M "Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications"
Japanese standard:
JIS G 4305:2012《Cold pressure extended steel plate and steel band》
These national standards stipulate the chemical composition, mechanical properties, dimensions and surface quality requirements of cold rolled stainless steel coil & sheet to ensure that the product quality and performance meet the corresponding standards. In international trade, these national standards are usually referred to to formulate product specifications and inspection requirements.
Chemical composition
| GRADE | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N |
| J1 | ≤0.150 | ≤0.800 | ≥9.00 | ≤0.005 | ≤0.030 | ≥13.00 | ≥1.00 | ≤0.60 | ≥0.70 | ≤0.200 |
| J3 | ≤0.150 | ≤0.800 | ≥9.00 | ≤0.060 | ≤0.030 | ≥12.00 | ≥1.00 | ≤0.60 | ≥0.40 | ≤0.200 |
| J4 | ≤0.150 | ≤0.800 | ≥8.50 | ≤0.060 | ≤0.030 | ≥13.50 | ≥1.00 | ≤0.60 | ≥1.30 | ≤0.200 |
201 is belong to high manganese and low nickel stainless steel, nickel content is low, corrosion resistance is poor, It’s more easy to get rusty if the deactivation film were destroyed, for example the surface is scratched. In China Series 201 is composed by J1 J3 J4 etc.
Mechanical Characteristics
| Grade | Tensile Strength(N/mm2) | Hardness
(HRB) | Yield Strength(N/mm2) | Elongation
(%) |
| J1 | ≤820 | ≤98 | ≥205 | ≥50% |
| J3 | ≤850 | ≤98 | ≥205 | ≥50% |
| J4 | ≤750 | ≤96 | ≥205 | ≥50%
|
Cold-rolled stainless steel coil: 0.25mm-6.0mm Common widths: 1000mm, 1219mm, 1140mm, 1250mm, 1500mm can be divided into strips.
Cold-rolled stainless steel strip: thickness range: 0.2mm-2.0mm width range: 5mm-680mm.
