S460N (EN 10025-3): Normalized or normalized rolled, with 460 MPa yield strength and -20°C toughness, ideal for bridges and cranes in moderate climates.
S460M (EN 10025-4): Thermomechanically rolled (TMCP), with 460 MPa yield strength and -50°C toughness, suited for cold climates and complex forming.
S460N is processed for consistent microstructure, while S460M's TMCP enhances formability and toughness, making it closer to en 10025 3 s460nl normalized structural steel plate in cold performance.
Chemical Composition Comparison
|
Element |
S460N (EN 10025-3, Ladle, max %) |
S460M (EN 10025-4, Ladle, max %) |
Role in Properties |
|---|---|---|---|
|
Carbon (C) |
0.20 |
0.16 |
S460M's lower carbon enhances toughness and weldability. |
|
Silicon (Si) |
0.60 |
0.60 |
Similar deoxidation and strength contribution. |
|
Manganese (Mn) |
1.00-1.70 |
1.00-1.70 |
Boosts strength and toughness in both. |
|
Phosphorus (P) |
0.030 |
0.025 |
S460M's lower phosphorus improves toughness. |
|
Sulfur (S) |
0.025 |
0.020 |
S460M's lower sulfur enhances weld quality. |
|
Niobium (Nb) |
0.05 |
0.05 |
Refines grains for toughness in both. |
|
Vanadium (V) |
0.20 |
0.12 |
S460N's higher vanadium boosts strength. |
Mechanical Properties Comparison
|
Property |
S460N (EN 10025-3, ≤16 mm) |
S460M (EN 10025-4, ≤16 mm) |
|---|---|---|
|
Yield Strength (min, MPa) |
460 |
460 |
|
Tensile Strength (MPa) |
540-720 |
530-720 |
|
Elongation (min, %) |
17 |
17 |
|
Impact Toughness (min, J) |
27 -20°C |
27 -50°C |
|
Hardness (Brinell) |
170-210 (typical) |
160-200 (typical) |
Processing and Fabrication
S460N: Normalized for consistent microstructure; suited for standard welding and machining. Preheating (100-150°C) for >20 mm; PWHT optional (550-650°C).
S460M: TMCP enhances formability for complex shapes; lower CEV (≤0.45%) improves weldability. Similar preheating and PWHT.
Consumables: Both use ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).
Applications
S460N: Bridges, cranes, building frameworks in moderate climates (e.g., temperate Europe).
S460M: Offshore platforms, wind towers, and structures in cold climates (e.g., northern Europe) due to superior toughness and formability.
For extreme cold, S460M aligns with en 10025 3 s460nl normalized structural steel plate.
