HUANSHENG PRODUCT

Chemical Composition
• Low Nickel, High Manganese: 200 series stainless steel strip belongs to the chromium-manganese austenitic stainless steel family. Its nickel content is low, generally not exceeding 5.5%. It is partially replaced by elements such as manganese and nitrogen, resulting in a higher manganese content.
• Adequate Chromium: Chromium is one of the key elements that contribute to the corrosion resistance of stainless steel. The chromium content of 200 series stainless steel is typically around 16%-18%.

Performance
• Corrosion Resistance: It exhibits moderate corrosion resistance in atmospheric and freshwater environments, but its corrosion resistance is significantly inferior to that of 300 series stainless steel in environments containing chloride ions or with strong acidity.
• Strength and Hardness: Due to the solid solution strengthening effect of manganese and nitrogen, it exhibits high strength and hardness, making it suitable for components bearing heavy loads.
• Processing: Compared to 300 series stainless steel, processing is more difficult. During welding, heat input must be carefully controlled to avoid problems such as weld cracking. Furthermore, processing operations such as stamping and forming are relatively limited.

Advantages
• Price Advantage: Due to its low nickel content and the relatively low cost of elements like manganese, 200 series stainless steel is significantly cheaper than 300 series stainless steel, offering significant advantages in cost-sensitive applications.
• Applicability in Mildly Corrosive Environments: 200 series stainless steel strip generally meets the requirements for mildly corrosive environments, such as interior decoration and general household items, and can replace 304 stainless steel.

Disadvantages
• Limited Corrosion Resistance: 200 series stainless steel strip is susceptible to corrosion in highly corrosive environments, such as at seaside locations and in chemical production, resulting in a shorter service life.
• Difficulty in Scrap Recycling: Scrap recycling can easily result in excessive manganese content in the resulting castings, leading to unstable feedstock composition in the steel mill.

Applications
• Architectural Decoration: 200 series stainless steel strip is used in door and window frames, stair railings, decorative moldings, and other applications, such as exterior decoration of commercial buildings and interior partitions.
• Household Goods: 200 series stainless steel strip can be used to make tableware, kitchenware, washing machine liners, refrigerator accessories, and other products, including stainless steel cutlery and kitchen sinks. • Transportation field: In automobile manufacturing, it can be used for automobile interior parts, body structural parts, etc., such as automobile door handles, seat frames, etc.

Composition Characteristics
• Chromium-nickel alloy: This is a Cr-Ni austenitic stainless steel. Chromium is a key element in forming the passive film, which imparts corrosion resistance. Nickel expands the austenite phase, giving the steel good toughness and forgeability.
• Other Elements: Some grades contain additions of elements such as molybdenum and titanium. For example, molybdenum in the 316 series improves resistance to pitting and crevice corrosion; titanium in 321 prevents intergranular corrosion.

Performance Characteristics
• Strong Corrosion Resistance: It exhibits strong corrosion resistance in many environments, offering good tolerance to air, water, acids, alkalis, and salts. For example, 316L exhibits outstanding corrosion resistance in chloride-containing seawater.
• Non-magnetic: With its austenitic structure, it is generally non-magnetic, making it suitable for applications requiring magnetic properties.
• Good Processability: It can be produced in various shapes and sizes through cold working methods such as cold rolling and cold drawing. It can also be welded, stamped, and bent.
• Combined Strength and Toughness: It offers high strength combined with good toughness, allowing it to withstand significant forces and deformation without breaking.

Common Grades and Applications
• 301: Compared to 304, it has lower Cr and Ni contents. Its tensile strength and hardness increase after cold working, making it suitable for applications such as trains, aircraft, and conveyor belts.
• 304: Highly versatile, with excellent corrosion resistance, heat resistance, low-temperature strength, and mechanical properties. It is used in medical devices, building materials, chemicals, ship components, automotive parts, the food industry, and household goods.
• 304L: A low-carbon 304 steel with excellent resistance to intergranular corrosion after welding or stress relief. It is used in outdoor machinery in the chemical, coal, and oil industries, where intergranular corrosion resistance is critical.
• 316L: In chloride-containing corrosive media, it offers higher corrosion resistance than 304 and 304L, making it suitable for seawater desalination and the water industry.
• 321: 304 steel is modified with Ti to prevent intergranular corrosion. It is suitable for use in temperatures between 430°C and 900°C, and is used in aircraft, exhaust pipes, boiler drums, and other applications.

Composition and Classification
• Main Composition: An alloy of iron, carbon, and chromium, with little or no nickel, making it a nickel-saving stainless steel, also known as stainless steel.

Performance Characteristics
• Corrosion Resistance: In oxidizing media such as air, fresh water, and nitric acid, with the same chromium content, its corrosion resistance is comparable to that of 300 series stainless steel and superior to that of 200 series stainless steel.
• Physical Properties: High thermal conductivity and low coefficient of expansion, offering excellent high-temperature oxidation resistance and performing well under thermal expansion and contraction conditions and thermal cycling. 400 series stainless steel strip is also magnetic.
• Mechanical Properties: Martensitic stainless steel has high strength and hardness, and its mechanical properties can be adjusted through heat treatment. Ferritic stainless steel has relatively low strength and is generally less tough than austenitic steel.
• Processing Performance: Compared to 300 series stainless steel, it is more difficult to process and has poorer weldability. Ferritic stainless steel is difficult to cold-form, and martensitic stainless steel also presents some challenges in cold-forming.

Common Grades and Applications
• 430: Contains 18% chromium, is inexpensive, has a low thermal expansion coefficient, and offers excellent resistance to chloride stress corrosion. It is used in household appliances, kitchenware, and architectural decoration, such as washing machine drums and kitchen sinks.
• 409L: Offers excellent resistance to high-temperature oxidation and corrosion, primarily used in automotive exhaust systems.

Advantages and Disadvantages
• Advantages: High resistance to high-temperature oxidation, with improved physical and mechanical properties compared to carbon steel. Relatively low price and high cost-effectiveness make it a viable alternative to 300 series stainless steel in applications where corrosion resistance is less critical.
• Disadvantages: Relatively poor formability, weldability, and tensile strength limit its application in certain applications, such as complex-shaped components and those requiring high-strength welding.