S620Q Steel Grade, Mechanical Properties, Chemical Composition, Grade Equivalent

Standard: EN 10025-6:2004, European standard for hot-rolled structural steel. Part 6 - Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition

Steel grade: S620Q ;

Number : 1.8914 .

Weldability : The steels specified in this document do not have unlimited suitability for the various welding processes, since the behaviour of a steel during and after welding depends not only on the material but also on the dimensions and shape and on the manufacturing and service conditions of the components. General requirements for arc welding of the steels specified in this document shall be as given in EN 1011-2.

With increasing product thickness and strength level cold cracking can occur. Cold cracking is caused by the following factors in combination:

- the amount of diffusible hydrogen in the weld metal;

- a brittle structure of the heat affected zone;

- significant tensile stress concentrations in the welded joint.

The tables below show the mechanical properties of grade S620Q

 
Minimum yield strength - ReH
MPa
Tensile strength Rm
MPa
Minimum elongation - A
Lo = 5,65*√ So (%)
Steel grade
Nominal thickness
mm
Nominal thickness
mm

 
>3
≤50
>50
≤100
>100
≤150
>3
≤50
>50
≤100
>100
≤150

S620Q
620
580
560
700-890
700-890
650-830
15

Notch impact test.

Notch impact test - longitudinal. Minimum values of impact energy for impact tests on longitudinal V-notch test pieces for quenched and tempered steel


Temperature
°C
-20
0
Min. absorbed energy
J
30
40

Notch impact test - transverse. Minimum values of impact energy for impact tests on transverse V-notch test pieces for quenched and tempered steel, when the impact test on transverse test pieces is agreed at the time of the order.

Temperature
°C
-20
0
Min. absorbed energy
J
27
30

The tables below show the chemical composition of grade S620Q

 
Ladle analysis.
Depending on the thickness of the product and the manufacturing conditions, the manufacturer may add to the steel one or several alloying elements up to the maximum values given in order to obtain the specified properties.
Nb, Ti, V, Zr shall be at least 0,015 % of a grain-refining element present. Aluminium is also one of these elements. The minimum content of 0,015 % applies to soluble aluminium, this value is regarded as attained if the total aluminium content is at least 0,018 %; in case of dispute the soluble aluminium content shall be determined.
Steel grade
C
max.
%
Mn
max.
%
Si
max.
%
P
max.
%
S
max.
%
B
max.
%
Nb
max.
%
V
max.
%
Ti
max.
%
Cr
max.
%
Mo
max.
%
Ni
max.
%
Cu
max.
%
Mo
max.
%
N
max.
%
Zr
max.
%
CEV
max. %

                                ≤50 >50
≤100		 >100
≤150
S620Q
0,20
1,70
0,80
0,025
0,015
0,005
0,06
0,12
0,05
1,50
0,70
2,0
0,50
0,70
0,015
0,15
0,65
0,77
0,83

S620Q Steel Grade Equivalent Table

European old
EU 137 (1983)
Germany
DIN,WNr
FeE 620 V
StE620V

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