What is SS400 carbon steel plate?
SS400 steel plate is a low-carbon structural steel that complies with the Japanese Industrial Standard (JIS G3101). It features a tensile strength of at least 400 MPa. It is a cost-effective general-purpose structural material. Due to its high strength, durability, and excellent overall mechanical properties, it is widely used in construction, bridges, ships, and general engineering applications.
What is S235JR carbon steel plate?
S235JR is a structural steel grade specified in the European standard EN 10025-2. "S" stands for structural steel, "235" refers to the minimum yield strength of 235 MPa, and "JR" indicates that a Charpy impact test at 20°C is required. This low-carbon, non-alloy steel offers excellent weldability, workability, and impact resistance, making it suitable for load-bearing applications such as building frames, railway vehicles, and general structural components.
What is the difference between SS400 carbon steel plate and S235JR?
SS400 is a Japanese (JIS G3101) general structural steel with a minimum yield strength of 245 MPa and a tensile strength around 400 MPa, while S235JR is a European (EN 10025-2) non-alloy structural steel with a minimum yield strength of 235 MPa and a tensile strength of 360–510 MPa. Both are widely used for construction and engineering due to their good formability, weldability, and toughness, though S235JR is often considered to have better weldability due to its lower carbon content.
1. Standards and Origin
| Grade | Standard | Region / Country | Specification Type |
|---|---|---|---|
| SS400 | JIS G3101 | Japan | Hot Rolled Carbon Steel Plate for General Structure |
| S235JR | EN 10025-2 | Europe | Non-Alloy Structural Steel Plate, Hot Rolled |
2. Chemical Composition Comparison
| Element | SS400 (JIS G3101) | S235JR (EN 10025-2) |
|---|---|---|
| Carbon (C) | ≤ 0.23% | ≤ 0.17–0.20% |
| Manganese (Mn) | ≤ 1.60% | 0.30–1.40% |
| Silicon (Si) | ≤ 0.50% | ≤ 0.035–0.040% |
| Phosphorus (P) | ≤ 0.050% | ≤ 0.035% |
| Sulfur (S) | ≤ 0.050% | ≤ 0.035% |
| Iron (Fe) | Balance | Balance |
3. Mechanical Properties Comparison
| Property | SS400 | S235JR |
|---|---|---|
| Tensile Strength (MPa) | 400 – 510 | 360 – 510 |
| Yield Strength (MPa) | ≥ 245 | ≥ 235 |
| Elongation (%) | ≥ 23 | ≥ 26 |
| Hardness (HBW) | ≤ 160 | ≤ 140 |
| Density (g/cm³) | 7.85 | 7.85 |
| Parameter | SS400 | S235JR |
|---|---|---|
| Standard | JIS G3101 | EN 10025-2 |
| Type | Hot Rolled Carbon Steel Plate | Hot Rolled Non-Alloy Structural Steel Plate |
| Thickness Range | 2 – 200 mm | 3 – 200 mm |
| Width | 1000 – 3000 mm | 1000 – 3000 mm |
| Length | 2000 – 12000 mm | 2000 – 12000 mm |
| Surface Finish | Hot rolled, pickled, oiled | Hot rolled, pickled, oiled |
| Delivery Condition | As rolled, normalized | As rolled, normalized |
| Weldability | Excellent | Excellent |
| Machinability | Good | Good |
| Formability | Good | Excellent |
| Applications | Construction, machinery, shipbuilding | Construction, bridges, frames, pipelines |
5. Applications
Both SS400 and S235JR are widely used in structural and industrial projects, including:
Construction and building frameworks
Machinery bases and structural components
Shipbuilding and marine structures
Automotive frames and trailers
Pressure vessels (low-medium stress)
S235JR is preferred in European projects or where impact-tested material is required.
SS400 is widely used in Asian markets for cost-effective structural solutions.