Sandvik 25.22.2.LMn is a manganese alloyed chromium-nickel-molybdenum filler material used for welding Sandvik 2RE69 (UNS S31050, 1.4466), Sandvik 3R60 U.G. (UNS S31603, 1.4435). The weld deposit has excellent low temperature toughness that makes it suitable for joining stainless steels for cryogenic service.
- ISO 14343: 25 22 2 N L
- AWS A5.9/ASME SFA-5.9: ER"310LMo"
- W.Nr.: (1.4466)*
Contact your nearest sales office for details.
* nearest equivalent
Please note that the Werkstoff Nr. corresponds to the base material of the grade.
Chemical composition (nominal) %
Sandvik 25.22.2.LMn has extensively been used successfully in all critical high-pressure units of modern urea processes, such as:
|Stripper tubes||Stamicarbon, Montedison IDR|
|Outer layer of bimetallic ( stripper tubes)||Saipem|
|Carbamate condensers||All processes|
Sandvik 25.22.2.LMn has also found extensive use in other corrosive environments in fertilizer plants, such as:
- Nitric acid cooler/condensers cooled with polluted cooling water
- Heating coils and pipe in NPK plants – Norsk Hydro process
Weld metal characteristics
MIG TIG – typical for non-heat treated weld metal
|Temperature||°C||20 (68)||400 (752)||-196 (-321)|
|Yield strength, Rp0.2||MPa||335 (49)||225 (33)||-|
|Tensile strength, Rm||MPa||580 (84)||410 (59)||-|
|Reduction in area, Z||%||58||-|
|Impact strength, Charpy V||J||120 (89)||100 (74)|
Sandvik 25.22.2.LMn has been developed primarily 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 126.96.36.199LMn also exhibits excellent resistance to intergranular 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/GTAW welding
Electrode positive is used to give good penetration in all types of welding joint. The following table shows common conditions for MIG welding.
|Wire diameter,mm (in.)||Wire feed, m/mm||Current, A||Voltage, V||Gas, l/min. (CFH)|
|0.8 (0.||5-9||50-140||16-25||15 (31)|
|Pulsed arc welding 1)|
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.
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.
Electrode positive is suggested for joint welding to give good penetration.
|Wire diameter, mm (in.)||Current, A||Voltage, V|
Recommended welding flux is Sandvik 31S.