S420m steel is a fine-grain weldable structural steel that has been
thermomechanically rolled. It conforms fully to the EN 10025-4/DSTU
EN 10025-4 standard.
Classification: Structural steel.
Product: Steel plates and shaped steel.
Chemical composition of S420m steel according to DSTU EN 10025-4,%
| Si | Mn | P | S | N | Cr | Cu | Mo | Nb | Ni | Ti | V | Al |
| ≤0.50 | ≤1.70 | ≤0.030 | ≤0.025 | ≤0.025 | ≤0.30 | ≤0.55 | ≤0.20 | ≤0.05 | ≤0.80 | ≤0.05 | ≤0.12 | ≥0.02 |
Mechanical properties of S420m steel
Nominal gauge, mm | Minimum yield strength, ReH (MPa) | Ultimate tensile strength, Rm (MPa) | Minimum elongation ratio σ, % |
≤16 | 420 | 520-680 | 19 |
> 16 ≤ 40 | 400 | 520-680 | 19 |
> 40 ≤ 63 | 390 | 500-660 | 19 |
> 63 ≤ 80 | 380 | 480-640 | 19 |
> 80 ≤ 100 | 370 | 470-630 | 19 |
> 100 ≤ 120 | 365 | 460-620 | 19 |
Analogues to S420M steel
Germany (DIN) | StE420TM |
US | ASTM A572 Gr.60 |
Italy (UNI) | FeE420KGTM |
Application
Products made from S420m steel are used in welded structures, large
boats and ships, various machinery, bridge supports and metal
structures, as well as supporting structures for wind turbines. The
steel is used in highway construction and other engineering
projects.
Welding
Given its low carbon content and equivalent carbon content, S420m
steel is ideally suited to both manual and automatic welding using
all the main processes. Its low susceptibility to cold cracking
makes preheating unnecessary. Nonetheless, the quality of the weld
seam depends on the welding process, conditions and use of
appropriate welding filler. Oxyfuel gas welding is not recommended.
Filler wire and welding rods must be used as welding filler for
this strength category. Basic-covered electrodes are recommended
for manual welding. These brands are not suitable for
heat-treatment above 580°C. The processor of these brands must
ensure that the calculations, design and processing methodology are
suitable for the material.
