Weldable structural steel plate S355G7+N is under steel standard EN 10225.For the steel plate thickness equal or below 25mm,the minimum yield strength for steel plate S355G7+N shall be above 355Mpa,for the thickness between 25mm and 40mm,the minimum yield strength shall be 345 Mpa,and for the thickness above 40mm,the minimum yield point of oil and offshore platform steel S355G7+N shall be 335 Mpa.
S355G7+N Steel plate Chemical Composition
S355G7+N Chemical Composition | |||||||
Grade | The Element Max (%) | ||||||
C | Si | Mn | P | S | Al | N | |
S355G7+N | 0.14 | 0.15-0.55 | 1.0-0.01 | 0.02 | 0.01 | 0.0055 | 0.01 |
Nb | V | Ti | Cu | Cr | Ni | Mo | |
0.04 | 0.06 | 0.025 | 0.3 | 0.25 | 0.5 | 0.08 | |
Crack Sensitivity: Pcm = (C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B)%
Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
S355G7+N Steel plate strength property
S355G7+N high strength property | |||||||
Grade |
| Mechanical Property | Charpy V Impact Test | ||||
Thickness | Yield | Tensile | Elongation | Degree | Energy 1 | Energy 2 | |
S355G7+N | mm | Min Mpa | Mpa | Min % | -40 | J | J |
t≤50 | 355 | 470-630 | 22% | 50 | 50 | ||
50＜t≤63 | 355 | 470-630 | 22% | 50 | 50 | ||
63＜t≤100 | 325 | 490-630 | 22% | 50 | 50 | ||
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal | |||||||
Properties & Performance
Strength: Good tensile and yield strength, maintaining properties across different thicknesses.
Toughness: Excellent impact toughness, especially at low temperatures (e.g., -40°C).
Weldability: High weldability, crucial for complex offshore structures.
Durability: High resistance to marine corrosion and harsh weather conditions.
Common Applications
Offshore platforms and rigs.
Marine vessels and shipbuilding.
Storage tanks and pressure vessels.
