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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