What is S355J0?
S355J0 is a non-alloy, high-strength structural steel defined in EN 10025-2.
The "S" stands for structural steel, "355" indicates a minimum yield strength of 355 MPa, and "J0" means the steel achieves 27 J Charpy impact energy at 0°C.
It is widely used in building structures, bridges, engineering components, and welded frameworks requiring higher strength than S275 series steels.
1. Mechanical Properties of S355J0
| Property | Value / Requirement | Notes / Standard |
|---|---|---|
| Yield Strength (ReH) | ≥ 355 MPa (≤16 mm) | EN 10025-2 |
| Tensile Strength (Rm) | 470–630 MPa | - |
| Elongation (A5) | ≥ 20% | Typical structural steel |
| Impact Energy (Charpy V-notch) | ≥ 27 J at 0°C | "J0" rating |
| Density | 7.85 g/cm³ | General carbon steel |
| Hardness (HB) | Approx. 140–180 HB | Brinell hardness |
2. Chemical Composition (Typical %)
| Element | Percentage (%) |
|---|---|
| C | ≤ 0.20 |
| Si | ≤ 0.55 |
| Mn | ≤ 1.60 |
| P | ≤ 0.035 |
| S | ≤ 0.035 |
| N | ≤ 0.012 |
What is S355JR?
S355JR is a non-alloy structural steel grade specified in EN 10025-2.
"S355" indicates a minimum yield strength of 355 MPa, and "JR" means the material must achieve 27 J impact energy at +20°C.
It is widely used in construction, bridges, steel structures, machinery, and general fabrication due to its strength, weldability, and versatility.
1. Mechanical Properties of S355JR
| Property | Value / Requirement | Notes / Standard |
|---|---|---|
| Yield Strength (ReH) | ≥ 355 MPa | EN 10025-2 |
| Tensile Strength (Rm) | 470–630 MPa | EN 10025-2 |
| Elongation (A5) | ≥ 20% | Typical for structural steel |
| Impact Energy (Charpy V) | ≥ 27 J at +20°C | "JR" rating |
| Density | 7.85 g/cm³ | General steel value |
| Brinell Hardness (HB) | ~150–200 HB | Typical range |
2. Chemical Composition of S355JR (Typical %)
| Element | % (Max / Typical) |
|---|---|
| C | 0.20–0.24 |
| Si | ≤ 0.55 |
| Mn | 1.40–1.60 |
| P | ≤ 0.035 |
| S | ≤ 0.035 |
| N | ≤ 0.012 |
What's the difference of them?
Mechanical Properties Comparison
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Impact Energy (Charpy V) | Impact Temperature |
|---|---|---|---|---|
| S355JR | ≥ 355 | 470–630 | ≥ 27 J | +20°C |
| S355J0 | ≥ 355 | 470–630 | ≥ 27 J | 0°C |
| S355J2 | ≥ 355 | 470–630 | ≥ 27 J | –20°C |
Chemical Composition (Typical %)
(Values vary slightly by product form; general range shown)
| Element | S355JR | S355J0 | S355J2 |
|---|---|---|---|
| C | ≤ 0.24 | ≤ 0.20–0.24 | ≤ 0.20–0.22 |
| Mn | 1.40–1.60 | 1.40–1.60 | 1.40–1.60 |
| P | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 |
| S | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 |
| N | - | Controlled | Controlled |
Key Differences (Simple Summary)
| Feature | S355JR | S355J0 | S355J2 |
|---|---|---|---|
| Toughness level | Low | Medium | High |
| Temperature resistance | Room temp | Mild cold | Cold climate |
| Best use cases | General structures | Outdoor structures | Low-temperature environments |
| Cost | Lowest | Medium | Highest |
GNEE Steel also supplies a variety of high-strength steel plates, such as A514 Grade F, A572 Grade 50, A588 Grade A, S355JR, S690Q, SS400, S690QL, Q345B, Q345E, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to info@gneesteels.com. You are welcome to consult us, and we are very willing to answer your questions.
