Sandvik 25.22.2.LMnB (Covered electrodes)
Datasheet updated 2012-08-03 09:05:20 (supersedes all previous editions)
Sandvik 25.22.2.LMnB is a covered electrode of AWS 310LMo-15 type with basic coating and normal metal recovery for welding of austenitic stainless steels used in the production of urea and nitric, sulphuric and acetic acid, for example, Sandvik 2RE69 and 3R60 U.G.
Sandvik 25.22.2.LMnB gives a fully austenitic chromium/nickel/molybdenum weld metal with an extremely low carbon content. There is little spatter and good slag removal.
Standards
- EN number E 25 22 2 N L B
Product standards
EN 1600
Approvals
TÜV
Chemical composition - all-weld metal
The following data is valid for non heat treated all-weld metal.
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Ni
|
Mo
|
N
|
|---|---|---|---|---|---|---|---|---|
| max | max | max | ||||||
|
0.040
|
0.4
|
4.5
|
0.020
|
0.020
|
25
|
22
|
2.1
|
0.15
|
Microstructure - all-weld metal
Fully austenitic.
Mechanical properties - all-weld metal
|
Temperature
|
oC
|
20
|
|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
420
|
|
Tensile strength, Rm
|
MPa
|
600
|
|
Elongation, A
|
%
|
30
|
|
Impact strength, Charpy V
|
J
|
70
|
Corrosion resistance - all-weld metal
General corrosion, typical rates
0.73 mm/year in 40% H2SO4 at 25 oC (75 oF)
0.13 mm/year in 60% boiling H3PO4
0.30 mm/year in 99% HNO3 at 60 oC (140 oF)
Intergranular corrosion
Resistant to intergranular corrosion in Huey testing according to ASTM A262 practice C, as well as ASTM A262 practice E.
Recommended welding data
|
Diameter, mm
|
2.5
|
3.25
|
4.0
|
5.0
|
|---|---|---|---|---|
|
Current, A
|
50-75
|
80-110
|
110-140
|
160-190
|
Redrying electrodes when necessary: 200 oC/2h
Marking
| Marking at grip end |
Sandvik 25.22.2.LMnB
|
|---|---|
| Tip colour |
green
|
Deposition data
|
Electrode diameter, mm
|
2.5
|
3.25
|
4.0
|
5.0
|
|---|---|---|---|---|
|
Length, mm
|
350
|
350
|
350
|
350
|
|
Weights:
kg/100 pcs |
2.2
|
3.2
|
4.9
|
7.8
|
|
kg/box
|
2.8
|
4.8
|
4.9
|
5.1
|
|
Electrodes/box
|
135
|
150
|
113
|
65
|
|
Max deposition rate,
kg weld metal/h, approx |
0.8
|
1.3
|
1.7
|
2.3
|
|
Effective value
kg weld metal/kg electrodes |
0.53
|
0.59
|
0.64
|
0.53
|
|
Change value
Electrodes/kg weld metal |
88
|
53
|
32
|
23
|
|
Burn off time per electrode
at max current, s |
50
|
52
|
66
|
70
|
|
Welding positions
|
diameter <4.0 mm
|
all except vertical down
|
|---|---|---|
|
diameter >5.0 mm
|
preferably flat position
|
|
|
Current/polarity
|
direct current/electrode positive
|
|
Applications
For joining:
- Highly alloyed, fully austenitic stainless steels, e.g. EN 1.4466 (Sandvik 2RE69), in the urea and nitric acid industries.
- EN 1.4577, 1.4578 and 1.4585
- Austenitic steels with high demands on toughness and strength at low temperatures.
For surfacing:
- Mild and low alloy steels for applications in the urea and nitric acid industries.
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Sandvik materials.
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