Steel grades

S355 Structural steel grades

Structural steels are mainly used in building and civil engineering applications.

Technical information

S355 Structural steel grades are carbon-manganese steels with guaranteed minimum mechanical properties (yield strength and tensile strength) and with satisfactory ductility.

Structural steels offer good weldability with all conventional welding processes. In addition to their excellent mechanical properties, structural steels have satisfactory toughness values, especially with +N or +M.

Delivery conditions:

Since 1 July 2013, the Construction Products Regulation (Regulation (EU) No. 305/2011 – CPR) has required that CE marking be affixed to all products delivered in accordance with a harmonised standard. This CE marking guarantees, for the uses defined in the standard, the properties described in the declaration of performance submitted by the manufacturer. All of the steels in this data description comply with this regulation.

Mechanical properties:

EN Standard
Designation Direction Thickness Re Rm A 5.65√So KV 20°C KV 0°C KV -10°C KV -20°C KV -30°C KV -40°C
KV -50°C
  EN 10027-1 EN 10027-2   (mm) (MPa) (MPa) (%) (J) (J) (J) (J) (J)  (J) (J)
EN 10025-2 S355                     L 5-120         JR J0    J2                                                    
≥27 27 ≥27
                  K2
≥40
T 5-16 ≥355 470-630 ≥20                            
16-40 ≥345
40-63 ≥335 ≥19
63-80 ≥325 ≥18
80-100 ≥315
100-120 ≥295 450-600
EN 10025-3 S355N 1.0545 L 5-120 - - - ≥55 ≥47 ≥43 ≥40
T 5-16 ≥355 470-630 ≥22 ≥31 ≥27 ≥24 ≥20
16-40 ≥345
40-63 ≥335
63-80 ≥325 ≥21
80-100 ≥315
100-120 ≥295 450-600
S355NL 1.0546 L 5-100 - - - ≥63 ≥55 ≥51 ≥47 ≥40 ≥31 ≥27
T 5-16 470-630 ≥22 ≥40 ≥40 ≥34 ≥30 ≥27 ≥23 ≥20 ≥16
16-40
40-63
63-80 ≥21
80-100
EN 10025-4 S355M 1.8823 L 5-60  - - -  ≥55 ≥47 ≥43 ≥40       
T 5-16 ≥355 470-630  ≥22  ≥31 ≥27 ≥24 ≥20
16-40 ≥345
40-60 ≥335 450-610
S355M 1.8834 L 5-50 - - - ≥63 ≥55 ≥51 ≥47 ≥40 ≥31 ≥27
T 5-16 ≥355 470-630 ≥22 ≥40 ≥34 ≥30 ≥27 ≥23 ≥20 ≥16
16-40 ≥345
40-50 ≥335 450-610

 

Chemical properties:

EN Standard Designation  Thickness  C (%) Mn (%) P (%)  S (%) Si (%) Al (%) Cu (%) Cr (%) Ni (%) Nb (%) V (%) Ti (%) N (%) Ceq (%) Mo (%)
   EN 10027-1 EN 10027-2  (mm)                
EN 10025-2  S355JR 1.0045 5-30 ≤0.24 ≤0.16 ≤0.035 ≤0.035 ≤0.55   ≤0.55           ≤0.012 ≤0.45  
30-120                           ≤0.47  
S355J0 1.0553 5-30 ≤0.20 ≤0.16 ≤0.030 ≤0.030 ≤0.55   ≤0.55           ≤0.012 ≤0.45  
30-120 ≤0.22                         ≤0.47  
S355J2+N 1.0577 5-30 ≤0.20 ≤0.16 ≤0.025 ≤0.025 ≤0.55   ≤0.55           - ≤0.45  
30-120 ≤0.22                         ≤0.47  
S355J2 1.0577 5-30 ≤0.20 ≤0.16 ≤0.025 ≤0.025 ≤0.55   ≤0.55           - ≤0.45  
30-120 ≤0.22                         ≤0.47  
S355K2+N 1.0596 5-30 ≤0.20 ≤0.16 ≤0.025 ≤0.025 ≤0.55   ≤0.55           - ≤0.45  
30-120 ≤0.22                         ≤0.47  
S255K2 1.0596 5-30 ≤0.20 ≤0.16 ≤0.025 ≤0.025 ≤0.55   ≤0.55           - ≤0.45  
30-120 ≤0.22                         ≤0.47  
EN 10025-2 S355N 1.0545 5-63 ≤0.20 0.90-1.65 ≤0.030 ≤0.025 ≤0.50 ≥0.020 ≤0.55 ≤0.30 ≤0.50 ≤0.050 ≤0.12 ≤0.050 ≤0.015 ≤0.43 ≤0.10
63-120                           ≤0.43  
S355NL 1.0546 5-63 ≤0.18 0.90-1.65 ≤0.025 ≤0.020 ≤0.50 ≥0.020 ≤0.55 ≤0.30 ≤0.50 ≤0.050 ≤0.12 ≤0.050 ≤0.015 ≤0.43 ≤0.10
63-120                           ≤0.43  
EN 10025-2 S355M 1.8823 5-40 ≤0.14 ≤1.60 ≤0.030 ≤0.025 ≤0.50 ≥0.020 ≤0.55 ≤0.30 ≤0.50 ≤0.050 ≤0.10 ≤0.050 ≤0.015 ≤0.39 ≤0.10
40-60                           ≤0.40  
S355ML 1.8834 5-40 ≤0.14 ≤1.60 ≤0.025 ≤0.020 ≤0.50 ≥0.020 ≤0.55 ≤0.30 ≤0.50 ≤0.050 ≤0.10 ≤0.050 ≤0.015 ≤0.39 ≤0.10
40-50                           ≤0.40