Sandvik 29.8.2.LR (Covered electrodes)
Datasheet updated 2012-08-03 09:07:35 (supersedes all previous editions)
Sandvik 29.8.2.LR is a covered electrode with rutile-basic coating and about 105% metal recovery for welding of super-duplex (ferritic-austenitic) stainless steels of UNS S32906 type (e.g. Sandvik SAF 2906).
The weld metal has especially good properties under severely corrosive conditions. Examples of properties are:
- Excellent stress corrosion cracking resistance in chloride-containing media
- Good pitting resistance
- High resistance to general corrosion
- High mechanical strength combined with good ductility
- High resistance to erosion corrosion and corrosion fatigue
Standards
- EN number 1600
- EN name Z 29 8 2 L R
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
|
1.5
|
0.030
|
0.025
|
29
|
8.3
|
2.4
|
0.28
|
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
|
|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
740
|
|
Tensile strength, Rm
|
MPa
|
880
|
|
Elongation, A
|
%
|
25
|
|
Reduction in area
|
%
|
40
|
|
Impact strength, Charpy V
|
J
|
30
|
Corrosion properties - all-weld metal
The minimum CPT value (Critical Pitting Temperature) in 6% ferric chloride solution is 35 °C (90 oF).
ASTM A262 Pr B, Corrosion rate <0,25 mm/year.
Recomended 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 29.8.2.LR
|
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 of Sandvik SAF 2906
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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