Sandvik 25.22.2.LMn (Welding wire)
Datasheet updated 2012-08-17 14:54:47 (supersedes all previous editions)
Sandvik 25.22.2.LMn is a fully austenitic filler material for welding Sandvik 2RE69 (310MoLN), Sandvik 3R60 U.G. (ASTM 316L) and corresponding grades used in the production of urea, nitric acid, sulphuric acid, acetic acid and in gas treatment plants. The weld deposit has excellent low temperature toughness that makes it suitable for joining stainless steels for cryogenic service.
Sandvik 25.22.2.LMn is a modified version of the 310 type which is the closest AWS grade in AWS A5.9. A constructed designation would be "310LMo".
Standards
- AWS ER "310LMo"
- EN number 25 22 2 N L
Product standards
EN ISO 14343
Approvals
CE, TÜV.
Chemical composition - filler metal
| C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|
| max | max | max | max | |||||
| 0.020 | 0.2 | 4.5 | 0.015 | 0.015 | 25 | 22 | 2.1 | 0.13 |
Chemical composition - all-weld metal
The following data is typical for non heat treated all-weld metal made by MIG welding with argon shielding gas.
| C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|
| max | max | max | ||||||
| 0.020 | 0.1 | 4 | 0.015 | 0.015 | 24.5 | 21.5 | 2.1 | 0.11 |
Microstructure - all-weld metal
Fully austenitic.
Mechanical properties - all-weld metal
|
Temperature
|
°C
|
20
|
400
|
-196
|
|---|---|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
335
|
225
|
-
|
|
Tensile strength, Rm
|
MPa
|
575
|
410
|
-
|
|
Elongation, A
|
%
|
42
|
29
|
-
|
|
Reduction in area, Z
|
%
|
58
|
-
|
-
|
|
Impact strength, Charpy V
|
J
|
120
|
-
|
100
|
|
Hardness, Vickers
|
HV
|
170
|
-
|
-
|
Physical properties- all-weld metal
|
Temperature, °C
|
20 | 100 | 300 | 500 |
|---|---|---|---|---|
|
Thermal conductivity,
W/m °C |
14 | 15 | 17 | 19 |
Thermal expansion per °C, from 20°C (68 oF) to 400°C (750 oF) 18x10-6
Density, g/cm3, at 20 oC (68 oF) 7.9
Corrosion resistance- all-weld metal
Sandvik 25.22.2.LMn has been developed primarly to cope with the severe corrosion conditions existing in the urea industry. Therefore, this filler has excellent resistance to corrosion in ammonium carbamate and nitric acid. Sandvik 25.22.2.2LMn also exhibits excellent resistance to intregranular corrosion. As an example, the corrosion rate in a Huey test for TIG weld metal, (5 x 48 hours in boiling 65% HNO3), is below 0.12 mm/year.
Recommended welding data
MIG welding
Electrode positive is used to give good penetration in all types of welded joint. The following table shows common conditions for MIG welding.
| Wire diameter, mm | Wire feed, m/min | Current, A | Voltage, V | Gas, l/min |
|---|---|---|---|---|
| Short-arc welding | ||||
| 0.8 | 5-9 | 50-140 | 16-25 | 15 |
| 1.0 | 5-9 | 70-160 | 16-25 | 15 |
| Spray-arc welding | ||||
| 1.0 | 6-12 | 150-230 | 26-31 | 22 |
| 1.2 | 5-9 | 170-280 | 27-32 | 22 |
| Pulsed-arc welding1) | ||||
| 1.2 | 3-10 | 150-250 | 23-31 | 18 |
1) Pulse parameters: Peak current 300 - 400 A
Background current 50 - 150 A
Frequency 80 - 120 Hz
Sandvik can provide recommendations for shielding gases.
Short-arc welding is used with thin gauge material of less than about 3 mm, in depositing root runs, and in welding out-of-flat positions.
The higher the inductance in short-arc welding, the higher the fluidity of the molten pool.
Spray-arc welding is normally used for heavier gauge material.
TIG welding
The parameters for TIG welding depend largely upon the base metal thickness and the welding application.
Electrode negative and a shielding gas of argon or helium should be used to prevent oxidation of the weld metal.
Submerged-arc welding
Electrode positive is suggested for joint welding to give good penetration.
| Wire diameter, mm | Current, A | Voltage, V |
|---|---|---|
| 2.0 | 200-300 | 28-32 |
| 2.4 | 250-400 | 28-32 |
| 3.2 | 300-450 | 29-34 |
Recommended welding flux is Sandvik 15W or Sandvik 31S.
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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