Characteristics of S420m-brand steel

 

S420m steel is a fine-grain weldable structural steel that has been thermomechanically rolled. It conforms fully to the DSTU EN 10025-4 standard.

Classification: Structural steel with improved resistance to atmospheric corrosion.

Product: Fine-grain weldable structural steel.

 

Chemical composition of S420m steel, %

С

Si

 Mn

P

S

N

Cr

Cu

Mo

Nb

Ni

Ti

V

Al

<0.16

<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

 540-720

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.

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