Both S355ML and S460ML are thermomechanically rolled (indicated by "M") fine-grain structural steel plates with specified low-temperature impact properties (indicated by "L"), conforming to EN 10025-4 . They are designed for heavy loaded welded structures requiring high toughness, excellent weldability, and resistance to brittle fracture even at sub-zero temperatures .
S355ML has a minimum yield strength of 355 MPa for thicknesses ≤16mm, tensile strength of 470-630 MPa, and minimum elongation of 22% . Its maximum carbon equivalent (CEV) is 0.36% .
S460ML offers significantly higher strength with minimum yield of 460 MPa (≤16mm), tensile strength of 540-720 MPa, but lower elongation of 17% . Its CEV is higher at 0.43% .
Key Differences:
Strength Level: S460ML provides approximately 30% higher yield strength than S355ML, allowing for substantial weight reduction in structural designs .
Chemical Composition: S460ML contains higher manganese (1.70% vs 1.60%) and permits higher vanadium (0.10% vs 0.05%), contributing to its enhanced strength .
Ductility: S355ML offers superior formability with 22% elongation versus 17% for S460ML .
Low-Temperature Toughness: Both maintain excellent impact properties down to -50°C/-60°C (40J longitudinal), though S460ML may have slightly reduced values for very thick sections.
Mechnical property for S420ML STEEL PLATE:
| Thickness (mm) | ||||||
| S420ML | ≤ 16 | > 16 ≤ 40 | > 40 ≤ 63 | > 63 ≤ 80 | > 80 ≤ 100 | > 100 |
| Yield strength (≥Mpa) | 420 | 400 | 390 | 380 | 370 | 365 |
| ≤ 40 | > 40 ≤ 63 | > 63 ≤ 80 | > 80 ≤ 100 | > 100 | ||
| Tensile strength (Mpa) | 520-680 | 500-660 | 480-640 | 470-630 | 460-620 | |
Mechnical property for S460ML STEEL PLATE:
|
Grade |
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
-50 degree |
|||||
|
S460ML |
≤16 |
460 |
540-720 |
17 |
27 |
|
16> to ≤40 |
440 |
540-720 |
17 |
27 |
|
|
40> to ≤63 |
430 |
530-710 |
17 |
27 |
|
|
63> to ≤80 |
410 |
510-690 |
17 |
27 |
|
|
80> to ≤100 |
400 |
500-680 |
17 |
27 |
|
|
100> to ≤120 |
385 |
490-660 |
17 |
27 |
Chemical composition for S420ML STEEL PLATE
| Main chemical elements composition of S420ML STEEL PLATE | ||||||
| C | Si | Mn | P | S | Nb | V |
| 0.16 | 0.50 | 1.70 | 0.025 | 0.020 | 0.05 | 0.12 |
| Al(total) | Ti | Cr | Ni | Mo | Cu | N |
| ≥0.02 | 0.05 | 0.30 | 0.80 | 0.20 | 0.55 | 0.025 |
Chemical composition for S460ML STEEL PLATE
|
S460ML Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Al |
N |
|
|
S460ML |
0.18 |
0.65 |
1.80 |
0.030 |
0.025 |
0.015 |
0.027 |
|
Nb |
V |
Ti |
Cu |
Cr |
Ni |
Mo |
|
|
0.06 |
0.14 |
0.06 |
0.60 |
0.35 |
0.85 |
0.23 |
|
