Guide to EN ISO 18275-A: MMA electrodes for high strength steels
Symbol
55
62
69
79
89
Yield Strength
min. N/mm2
Tensile Strength
N/mm2
Elongation
min. %
550
620
690
790
890
610-780
690-890
760-960
880-1080
980-1180
18
18
17
16
15
E 62
7
Symbol
Welding position
1
2
3
4
5
All positions
All positions, except vertical down
Flat butt weld, flat fillet weld, horizontal-vertical fillet weld
Flat butt weld, flat fillet weld
Vertical down and positions according to symbol 3
Symbol
Metal recovery, %
Type of current
1
2
3
4
5
6
7
8
<105
<105
>105 <125
>105 <125
>125 <160
>125 <160
>160
>160
AC +DC
DC
AC +DC
DC
AC +DC
DC
AC +DC
DC
MnNi B
3
Symbol
Z
A
0
2
3
4
5
6
7
8
No requirements
+20
0
–20
–30
–40
–50
–60
–70
–80
H5
T
Symbol
Hydrogen content,
ml/100 g deposited
weld metal, max.
H5
H10
H15
5
10
15
Chemical composition of all-weld metal , % *
Mn
Impact Energy
Charpy-V
Temp °C for 47J min.
4
Only basic electrode
covering.
Covered electrode/
manual metal arc
welding.
Symbol
Indicates mechanical
properties after stress
relief treatment.
MnMo
Mn1Ni
1NiMo
1.5NiMo
2NiMo
Mn1NiMo
Mn2NiMo
Mn2NiCrMo
Mn2Ni1CrMo
Z
1.4 - 2.0
1.4 - 2.0
1.4
1.4
1.4
1.4 - 2.0
1.4 - 2.0
1.4 - 2.0
1.4 - 2.0
Ni
Cr
–
–
0.6 - 1.2
–
0.6 - 1.2
–
1.2 - 1.8
–
1.8 - 2.6
–
0.6 - 1.2
–
1.8 - 2.6
–
1.8 - 2.6
0.3 - 0.6
1.8 - 2.6
0.6 - 1.0
Any other agreed composition
Mo
0.3 - 0.6
–
0.3 - 0.6
0.3 - 0.6
0.3 - 0.6
0.3 - 0.6
0.3 - 0.6
0.3 - 0.6
0.3 - 0.6
* If not specified C 0.03-0.10, Ni <0.3, Cr <0.2, Mo <0.2, V <0.05, Nb <0.05, Cu <0.3,
P <0.025, S <0.020, Si <0.80.
Single values shown in the table are maximum values.
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