Sandvik 24.13.LNb (Welding strip)
Datasheet updated 2011-10-13 13:24:18 (supersedes all previous editions)
Sandvik 24.13.LNb is a strip electrode used to obtain a E309LNb corrosion resistant overlay weld deposit on C-, CMn- and low-alloyed steels using submerged-arc welding (SAW) with the flux Sandvik 10SW or electroslag welding (ESW) with the high speed flux Sandvik 49S. It gives a 347/E347 chemical composition when used in single layer technique. Sandvik 24.13.LNb can also be combined with Sandvik 19.9.LNb for the second layer to obtain a 347/E347 weld deposit. There are also other possible combinations and conditions.
Standards
- AWS "EQ309LNb"
- EN number B 23 12 Nb
Product standards
- EN ISO 14343
- ASME/AWS SFA5.9
Chemical composition - strip electrode
|
C
max |
Si | Mn | P max |
S
max |
Cr | Ni | Mo max |
Cu max |
Nb |
|---|---|---|---|---|---|---|---|---|---|
|
0.02
|
0.3 | 2 | 0.020 |
0.020
|
24 | 12.5 | 0.3 | 0.3 | 0.75 |
Ferrite content
The ferrite content is nominally 22 FN WRC.
Chemical composition of overlay
Typical chemical composition of single layer obtained on C-Mn steel and low-alloyed steel.
 |
Type of overlay
|
C
|
Cr
|
Ni
|
FN, WRC
|
|---|---|---|---|---|---|
| SAW 24.13.LNb/10SW |
E347
|
max 0,06
|
18,5-20
|
9-10,5
|
3-8
|
| ESW 24.13.LNb/49S |
347, E347
|
max 0,06
|
17,5-19,5
|
9-10,5
|
3-8
|
Consider the figures as examples. Parameters selected and conditions influence on the result. Please contact Sandvik for details and guidelines.
Mechanical properties of overlay
Passes side bend testing according to ASME Section IX.
Corrosion properties of overlay
The resistance to general corrosion is good. It is a general purpose overlay for midly corrosive media, also at elevated temperatures for example in the petrochemical industry.
The resistance to intergranular corrosion in Strauss testing (ASTM A262 Practice E) is good also after post-weld-heat-treatment.
In pitting corrosion applications Mo-alloyed strip electrodes shall be selected. Contact Sandvik for more information
Welding data
| Process/Flux | Size |
Current, A
|
Voltage, V
|
Travel speed, mm/min
|
|---|---|---|---|---|
| SAW/10SW | 30 x 0.5 mm |
300 - 425
|
28-30
|
80 - 160
|
| SAW/10SW | 60 x 0.5 mm |
650 - 850
|
28-30
|
80 - 160
|
| SAW/10SW | 90 x 0.5 mm |
975 - 1275
|
28-30
|
80 - 160
|
| ESW/49S | 60 x 0.5 mm |
1600 - 2200
|
23-26
|
250 - 450
|
| ESW/49S | 90 x 0.5 mm |
2400 - 2800
|
23-26
|
250 - 350
|
Direct current, with electrode positive is normally used.
The welding data in the table represent the operation capability of the flux. The desired properties of the overlay are obtained by proper selection of the settings within the ranges.
Applications
Sandvik 24.13.LNb is used for corrosion resistant weld surfacing of components in the chemical, petrochemical, nuclear industry. Typical components are pressure vessels, heat exchangers, shafts, industrial piping etc.
It is very common in petrochemical applications.
It is often used as transition layer on which a second layer is welded, using 19.9.LNb for better corrosion resistance.
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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