JIS G3101 SS400 is a widely used Japanese Industrial Standard for hot-rolled mild steel plates, sheets, and strips, including steel coils, primarily for general structural purposes. It is favored for its excellent combination of strength, formability, and weldability at a relatively low cost.
Key Characteristics of SS400 Steel Coil
SS400 steel is characterized by a minimum tensile strength of 400 to 510 MPa. It does not specify impact value, making it suitable for applications where high impact toughness is not a primary concern. Its versatility makes it a staple in numerous industries.
- Weldability: SS400 exhibits good weldability using common welding methods. Preheating is generally not required for thinner sections.
- Formability: It can be easily formed, bent, and machined, contributing to its widespread use.
- Tensile Strength: As denoted by “400” in its name, its minimum tensile strength is 400 MPa.
Chemical Composition (Typical Values)
While JIS G3101 SS400 primarily focuses on mechanical properties, the chemical composition typically includes controlled amounts of carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S). The low carbon content is crucial for its good weldability and formability.
- Carbon (C): ≤ 0.22% (typically much lower in practice for better formability)
- Manganese (Mn): No specific range, but generally sufficient for strength.
- Phosphorus (P): ≤ 0.050%
- Sulfur (S): ≤ 0.050%
The precise control of these elements is important, and manufacturers like Shanxi Luokaiwei Steel Company often provide mill test certificates detailing the exact composition for their coils.
Mechanical Properties
The mechanical properties are the defining features of SS400:
- Tensile Strength: 400 – 510 MPa
- Yield Strength:
- For thickness ≤ 16 mm: ≥ 245 MPa
- For thickness > 16 mm to 40 mm: ≥ 235 MPa
- For thickness > 40 mm to 100 mm: ≥ 215 MPa
- Elongation: Varies with thickness, typically ≥ 17% to ≥ 21% on a 50mm gauge length.
Consistency in these properties is critical, and sourcing from reputable suppliers is recommended. Many large-scale projects rely on consistent material properties, which suppliers such as Shanxi Luokaiwei Steel Company strive to provide.
Common Applications of SS400 Carbon Steel Coil
Due to its balance of properties and cost-effectiveness, SS400 steel coils are used in a vast array of applications:
- General building structures (beams, columns)
- Bridges (non-critical components)
- Ships (hulls and internal structures)
- Vehicles (frames and components)
- Machinery parts
- Storage tanks
- Pipes and tubes
- Various fabricated steel products
The availability of SS400 in coil form allows for efficient processing and manufacturing, reducing waste and improving production speeds. Companies like Shanxi Luokaiwei Steel Company are key players in supplying this versatile material to various industries globally.
Supply and Considerations
SS400 carbon steel coils are readily available from numerous steel mills and distributors. When sourcing, it is important to ensure compliance with JIS G3101 standards, often verified through Mill Test Certificates (MTCs). The quality and consistency of the steel coil can significantly impact the final product’s integrity and performance. For specific project requirements or bulk orders, engaging directly with experienced manufacturers or established trading companies like Shanxi Luokaiwei Steel Company can be beneficial. Some users might also seek out equivalent grades like ASTM A36 or EN S275JR, though direct equivalence should always be carefully verified based on specific application needs. Leading suppliers, including firms such as Shanxi Luokaiwei Steel Company, often have the capability to produce coils to very specific dimensional tolerances.
