Datasheet updated 2013­11­27 10:22:34 (supersedes all previous editions)
Sandvik 25.22.2.LMn
(Welding strip)
Sandvik 25.22.2.LMn is a strip electrode commonly used in urea plants to obtain a
25Cr­22Ni­2Mo type of corrosion resistant overlay weld deposit on C­, CMn­ and
low­alloyed steels using submerged­arc welding (SAW) with the flux Sandvik 31S or
electroslag welding (ESW) with the flux Sandvik 47S.
Since there are many possible combinations and conditions it is recommended to
consult Sandvik for details and advice.
STANDARDS
•
•
AWS 25.22.2.LMn is a modified version of 310 which is the closest AWS grade in AWS
A5.9. Best described as 310LMo
EN number B 25 22 2 N L
Product standards
•
•
EN ISO 14343
ASME/AWS SFA5.9
CHEMICAL COMPOSITION - STRIP ELECTRODE
CHEMICAL COMPOSITION, WT%
C
S i Mn
P
S
Cr
Ni
Mo
N
≤0.020
≤0.2
4,5
≤0.015
≤0.015
25
22
2,1
0.13
Ferrite content
Fully austenitic micro structure.
CHEMICAL COMPOSITION OF OVERLAY
Typical chemical composition of overlay obtained on C­Mn steel.
Two layer welding procedures are also possible. Contact Sandvik for details and
guidelines.
CHEMICAL COMPOSITION, WT%
Type of
overlay
C
Cr
Ni
Mo
SAW 3 layer
25.22.2.LMn/31S
25Cr­22Ni­
2Mo
0,03
24,0­
24,5
21­
22
2,0­
2,1
ESW 3 layer
25.22.2.LMn/47S
25Cr­22Ni­
2Mo
0,02
24,0­
25,0
21,5­
22
2,0­
2,1
The ferrite content of the overlay is max 0,5 %.
Consider the figures as examples. Many parameters influence on the result. Please
consult Sandvik for details guidelines.
The flux data sheet gives detailes about the flux.
MECHANICAL PROPERTIES OF OVERLAY
Passes side bend testing according to ASME Section IX
CORROSION PROPERTIES OF OVERLAY
Meet the commonly specified corrosion rates in Huey testing (ASTM A262 Practice B).
Typical corrosion rate 0,10 mm/year.
WELDING DATA
Process/Flux
Size
Current,
A
Voltage,
V
Travel speed,
mm/min
SAW/31S
30 x 0.5
mm
400 ­ 500
26­30
100 ­ 180
SAW/31S
60 x 0.5
mm
700 ­ 900
26­30
100 ­ 160
SAW/31S
90 x 0.5
mm
1100 ­
1500
26­30
100 ­ 160
ESW/47S
60 x 0.5
mm
1100 ­
1400
23­26
130 ­ 220
ESW/47S
90 x 0.5
mm
1650 ­
2100
23­26
130 ­ 220
APPLICATIONS
Sandvik 25.22.2.LMn is used for corrosion resistant weld surfacing of components in
urea plants. Typical components are pressure vessels, heat exchangers.
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.
www.smt.sandvik.com/contact-us
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