Sandvik 25.10.4.LR (Covered electrodes)
Datasheet updated 2012-08-03 09:04:36 (supersedes all previous editions)
Sandvik 25.10.4.LR is a covered electrode with rutile-basic coating and about 105% metal recovery used for welding of super-duplex (ferritic-austenitic) stainless steels of UNS S32750/S32760 type (e.g. Sandvik SAF 2507).
The weld metal has especially good properties under severely corrosive conditions. Examples of properties are:
- Excellent stress corrosion cracking resistance in chloride-containing media
- Excellent pitting resistance
- High resistance to general corrosion
- High resistance to erosion corrosion and corrosion fatigue
Spray transfer gives a bead with a finely rippled surface. There is little spatter and very good slag removal.
Standards
- AWS E2594-16
- EN number E 25 9 4 N L
Product standards
- EN ISO 1600
- ASME/AWS SFA5.4
Approvals
DNV, 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 | |||||||
|
0.03
|
0.5
|
0.7
|
0.030
|
0.025
|
25
|
9.5
|
4.0
|
0.25
|
Microstructure - all-weld metal
Austenitic-ferritic (Duplex) microstructure with approximately 40 FN calculated from the WRC 92 diagram.
Mechanical properties - all-weld metal
|
Temperature
|
oC
|
20
|
-40
|
|---|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
640
|
-
|
|
Tensile strength, Rm
|
MPa
|
840
|
-
|
|
Elongation, A
|
%
|
25
|
-
|
|
Reduction in area
|
%
|
50
|
-
|
|
Impact strength, Charpy V
|
J
|
50
|
35
|
Corrosion resistance - all-weld metal
The minimum CPT value (Critical Pitting Temperature) in 6% ferric chloride solution is 40 °C (105oF).
Recommended welding data
|
Diameter, mm
|
2.5
|
3.25
|
4.0
|
|---|---|---|---|
|
Current, A
|
55-85
|
70-110
|
110-150
|
Redrying electrodes when necessary: 300 °C (570 oF)/2h
Marking
| Marking at grip end |
Sandvik 25.10.4.LR
|
|---|---|
| Tip colour |
blue
|
Deposition data
|
Electrode diameter, mm
|
2.5
|
3.25
|
4.0
|
|---|---|---|---|
|
Length, mm
|
300
|
350
|
350
|
|
Weights:
kg/100 pcs |
1.8 |
3.5 |
.
5.3 |
|
kg/box
|
1.8
|
4.5
|
4.4
|
|
Electrodes/box
|
98
|
121
|
83
|
|
Welding positions
|
diameter <2.5 mm
|
all except vertical down
|
|---|---|---|
|
diameter >3.25 mm
|
all except vertical down and overhead
|
|
|
Current/polarity
|
direct current/electrode positive or alternating current at an open circuit voltage of at least 60V
|
|
Applications
For welding:
- High alloy austenitic-ferritic stainless steels such as Sandvik SAF 2507 and other super duplex steels.
- 25% chromium duplex stainless steels with PRE values between 37 and 40.
- Sandvik SAF 2205 and corresponding duplex steels where the highest corrosion resistance is required.
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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