S460N and S420N are normalized, high-strength, low-alloy structural steel plates conforming to EN 10025-3 standard, differing primarily in yield strength (460 MPa for S460N vs. 420 MPa for S420N) and toughness, making them suitable for heavy welded structures like bridges, cranes, and vessels, with S460N offering greater strength for demanding loads and S420N a slightly lower-strength, good weldability option for moderate climates.
Chemical Composition of S420N Steel plate
|
Element |
Ladle Analysis (max %) |
Product Analysis (max %) |
|---|---|---|
|
Carbon (C) |
0.20 |
0.23 |
|
Silicon (Si) |
0.60 |
0.70 |
|
Manganese (Mn) |
1.00-1.70 |
1.10-1.80 |
|
Phosphorus (P) |
0.025 |
0.035 |
|
Sulfur (S) |
0.015 |
0.025 |
|
Nitrogen (N) |
0.025 |
0.030 |
|
Aluminum (Al) |
0.020 (min, total) |
0.020 (min, total) |
|
Niobium (Nb) |
0.05 |
0.06 |
|
Vanadium (V) |
0.10 |
0.12 |
|
Titanium (Ti) |
0.05 |
0.07 |
|
Chromium (Cr) |
0.30 |
0.35 |
|
Nickel (Ni) |
0.80 |
0.85 |
|
Molybdenum (Mo) |
0.10 |
0.12 |
Chemical Composition of S460N Steel plate
|
Element |
Ladle Analysis (max %) |
Product Analysis (max %) |
|---|---|---|
|
Carbon (C) |
0.20 |
0.23 |
|
Silicon (Si) |
0.60 |
0.70 |
|
Manganese (Mn) |
1.70 |
1.80 |
|
Phosphorus (P) |
0.025 |
0.035 |
|
Sulfur (S) |
0.015 |
0.025 |
|
Nitrogen (N) |
0.025 |
0.030 |
|
Aluminum (Al) |
0.020 (min, total) |
0.020 (min, total) |
|
Niobium (Nb) |
0.05 |
0.06 |
|
Vanadium (V) |
0.12 |
0.15 |
|
Titanium (Ti) |
0.05 |
0.07 |
Mechanical Propertie of S420N Steel plate
|
Thickness (mm) |
Yield Strength (min, MPa) |
Tensile Strength (MPa) |
Elongation (min, %) |
Impact Energy (min, J @ -20°C) |
|---|---|---|---|---|
|
≤16 |
420 |
520-680 |
19 |
27 |
|
16<t≤40 |
400 |
520-680 |
19 |
27 |
|
40<t≤63 |
390 |
520-680 |
19 |
27 |
|
63<t≤80 |
340 |
520-680 |
19 |
27 |
|
80<t≤100 |
290 |
520-680 |
19 |
27 |
|
100<t≤150 |
260 |
520-680 |
20 |
27 |
|
150<t≤200 |
220 |
500-650 |
20 |
27 |
Mechanical Propertie of S460N Steel plate
|
Thickness (mm) |
Yield Strength (min, MPa) |
Tensile Strength (MPa) |
Elongation (min, %) |
Impact Energy (min, J @ -20°C) |
|---|---|---|---|---|
|
≤16 |
460 |
540-720 |
17 |
27 |
|
16<t≤40 |
460 |
540-720 |
17 |
27 |
|
40<t≤63 |
440 |
570-720 |
17 |
27 |
|
63<t≤80 |
400 |
570-720 |
17 |
27 |
|
80<t≤100 |
380 |
570-720 |
17 |
27 |
|
100<t≤150 |
340 |
540-720 |
18 |
27 |
Key Characteristics
Standard: Both fall under EN 10025-3 for normalized fine-grain structural steels, ensuring good weldability and impact toughness.
Strength: S460N has a minimum yield strength of 460 MPa, while S420N has 420 MPa, making S460N stronger for heavy-duty applications.
Applications: Used in large welded structures, including bridges, cranes, power plant equipment, boilers, and mining machinery.
Weldability: Both offer good weldability, often requiring preheating and suitable consumables (like ER70S-6), with lower carbon equivalents (CEV) aiding fabrication.
Low-Temp Toughness: The 'N' denotes normalized delivery, providing good toughness, with 'NL' grades offering even better performance at lower temperatures (e.g., -50°C vs. S460N's -20°C) for colder climates.
