SS400 Carbon Steel Plate Sheet: Overview and Applications SS400 is a general-purpose carbon steel plate and sheet material widely used in construction, machinery, and structural applications. It belongs to the JIS G 3101 standard (Japanese Industrial Standards) and is known for its moderate strength, good weldability, and cost-effectiveness. Chemical Composition and Mechanical Properties SS400 is a low-carbon steel with a typical composition of: - Carbon (C): ≤0.30% - Manganese (Mn): ≤1.40% - Phosphorus (P): ≤0.050% - Sulfur (S): ≤0.050% The mechanical properties of SS400 include: - Tensile Strength: 400–510 MPa - Yield Strength: ≥245 MPa - Elongation: ≥17% (depending on thickness) - Hardness: Approximately 120–160 HB These properties make SS400 suitable for applications requiring moderate strength and formability without the need for high alloy content. Advantages of SS400 Carbon Steel 1. Good Weldability: Due to its low carbon content, SS400 can be easily welded using common methods such as arc welding, MIG, and TIG without significant risk of cracking. 2. Machinability: The steel can be cut, drilled, and shaped with standard machining tools, making it ideal for fabrication. 3. Ductility and Formability: SS400 can be bent and formed into various shapes, which is beneficial for structural components. 4. Cost-Effective: Compared to high-alloy steels, SS400 is more affordable while still providing sufficient strength for many industrial uses. Common Applications SS400 carbon steel plates and sheets are widely used in: - Construction: Beams, columns, and framework for buildings and bridges. - Machinery: Base plates, brackets, and machine components. - Automotive: Chassis parts and structural reinforcements. - General Fabrication: Storage tanks, agricultural equipment, and support structures. Surface Treatment and Corrosion Resistance While SS400 offers decent mechanical properties, it has limited corrosion resistance. To enhance durability, surface treatments such as painting, galvanizing, or coating are often applied. Conclusion SS400 carbon steel plate and sheet is a versatile, economical material suitable for various structural and industrial applications. Its balance of strength, weldability, and affordability makes it a popular choice in construction and manufacturing. However, proper surface protection is necessary in corrosive environments to extend its service life. For projects requiring moderate strength and ease of fabrication, SS400 remains a reliable and widely used carbon steel grade.