Sandvik 27.31.4.LCuR (Covered electrodes)
Datasheet updated 2012-08-03 09:06:07 (supersedes all previous editions)
Sandvik 27.31.4.LCuR is a covered electrode of AWS 383-16 type with rutile-basic coating and normal metal recovery for welding of high-alloy austenitic stainless steels of UNS S08028 (e.g. Sanicro 28) and Alloy 825 type (e.g. Sanicro 41).
Standards
- AWS (383-16)
- EN number E 27 31 4 Cu L
Product standard
- EN ISO 1600
- ASME/AWS SFA5.4
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
|
Cu
|
|---|---|---|---|---|---|---|---|---|
| max | max | max | ||||||
|
0.025
|
0.8
|
1.0
|
0.025
|
0.020
|
27
|
31
|
3.5
|
1.0
|
Microstructure - all-weld metal
Fully austenitic.
Mechanical properties - all-weld metal
|
Temperature
|
oC
|
20
|
|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
350
|
|
Tensile strength, Rm
|
MPa
|
550
|
|
Elongation, A
|
%
|
35
|
|
Impact strength, Charpy V
|
J
|
90
|
Corrosion resistance - all-weld metal
General corrosion
Typical corrosion rate in a solution of 70% H3PO4 + 4% H2SO4 + 0.45% Fe3+ + 60 ppm Cl- + 0.4% F- at 100 oC (210oF) is 0.3 mm/year.
Intergranular corrosion
Resistant to intergranular corrosion in tests according to ASTM A262 Pr C, ASTM A262 practice E.
Recommended welding data
|
Diameter, mm
|
2.5
|
3.25
|
4.0
|
|---|---|---|---|
|
Current, A
|
60-70
|
90-110
|
130-140
|
Redrying electrodes when necessary: 300 oC (570 oF)/2h
Marking
| Marking at grip end: | Sandvik 27.31.4.LCuR |
| Tip colour: | green |
Deposition data
|
Electrode diameter, mm
|
2.5
|
3.25
|
4.0
|
|---|---|---|---|
|
Length, mm
|
350
|
350
|
350
|
|
Weights:
kg/100 pcs |
2.1
|
3.1
|
4.7
|
|
kg/box
|
2.9
|
5.7
|
5.9
|
|
Electrodes/box
|
145
|
185
|
125
|
|
Max deposition rate,
kg weld metal/h, approx |
0.9
|
1.2
|
1.5
|
|
Effective value
kg weld metal/kg electrodes |
0.57
|
0.58
|
0.63
|
|
Change value
Electrodes/kg weld metal |
82
|
50
|
33
|
|
Burn off time per electrode
at max current, s |
55
|
63
|
72
|
|
Welding positions
|
diameter <3.25 mm
|
all except vertical down
|
|---|---|---|
|
diameter >4.0 mm
|
preferably flat position
|
|
|
Current/polarity
|
direct current/electrode positive or alternating current at an open circuit voltage of at least 70V
|
|
Applications
- For joining highly alloyed fully austenitic stainless steels, such as EN 1.4563 (Sanicro 28) and Alloy 825 (Sanicro 41), which have high corrosion resistance in sulphuric and phosphoric acids and excellent pitting resistance in acid solutions containing chlorides and fluorides, such as sea water.
- For surfacing mild and low alloy steels to give protection against pitting corrosion in chloride-containing solutions.
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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