Sandvik 25.20.L (Welding wire)
Datasheet updated 2013-03-13 17:30:55 (supersedes all previous editions)
Sandvik 25.20.L is a filler wire for joining Sandvik 2RE10 (UNS S31002) and similar grades used in heavily oxidizing media such as pipes in preheaters, coolers and condensers in the chemical industry. Sandvik 25.20.L can used for gas-shielded arc and submerged-arc welding.
Standards
- AWS ER"310L"
- EN number Z 25 20 L
Product standards
- ASME/AWS SFA5.9
Chemical composition - filler metal
| C | Si | Mn | P | S | Cr | Ni | Mo | Co | Cu |
|---|---|---|---|---|---|---|---|---|---|
| max | max | max | max | max | max | ||||
| 0.020 | 0.2 | 1.8 | 0.015 | 0.015 | 24.5 | 20.5 | 0.30 | 0.20 | 0.10 |
Chemical composition - all-weld metal
The following data is typical for non heat treated all-weld metal made by TIG welding with argon shielding gas.
| C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| max | max | max | ||||
| 0.020 | 0.2 | 1.6 | 0.015 | 0.015 | 24 | 20 |
Microstructure - all-weld metal
Fully austenitic matrix.
Mechanical properties - all-weld metal
|
Temperature
|
°C
|
20
|
-196
|
|---|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
380
|
-
|
|
Tensile strength, Rm
|
MPa
|
590
|
-
|
|
Elongation, A
|
%
|
37
|
-
|
|
Reduction in area, Z
|
%
|
57
|
-
|
|
Impact strength, Charpy V
|
J
|
-
|
150
|
|
Hardness, Vickers
|
HV
|
170
|
-
|
Physical properties - all-weld metal
|
Temperature, °C
|
20 | 100 | 300 | 400 |
|---|---|---|---|---|
|
Thermal conductivity, W/m
|
14 | 15 | 17 | 19 |
Thermal expansion per °C, from 20°C (68 oF) to 400°C (750 oF) 16.7x10-6
Density, g/cm3, at 20 oC (68 oF) 8.0
Corrosion resistance - all-weld metal
Sandvik 25.20.L has very good resistance to intergranular corrosion, pitting and stress corrosion cracking due to its high chromium and nickel contents. As an example, the mean value corrosion rate in a Huey test for MIG weld metal (5 x 48 hours in boiling 65% HNO3) after 1 h sensitization at 675°C (1245 oF), is 0.35 mm/year.
Recommended welding data
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.
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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