Sandvik 23.7.L (Welding wire)
Datasheet updated 2012-08-02 19:20:56 (supersedes all previous editions)
Sandvik 23.7.L is a duplex stainless filler metal for welding lean duplex stainless steels such as Sandvik SAF 2304, LDX 2101* and similar. Corrosion resistance is equal to 316L in most applications.
Standards
- EN number 23 7 L N
Product standards
EN ISO 14343
Chemical composition- filler metal
| C max |
Si | Mn | P max |
S max |
Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|
| 0.020 | 0.7 | 1.7 | 0.025 | 0.005 | 23 | 7 | 0.3 | 0.14 |
Chemical composition - all-weld metal
The data above is typical for non heat treated all-weld metal made by the TIG (GTAW) method
Microstructure - all-weld metal
Austenitic-ferritic microstructure with approximately 50 FN, calculated from the WRC-92 diagram
Mechanical properties - all-weld metal
|
Temperature
|
° C
|
20
|
-20
|
|
|---|---|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
525
|
-
|
|
|
Tensile strength, Rm
|
MPa
|
710
|
-
|
|
|
Elongation, A
|
%
|
25
|
-
|
|
|
Impact strength, Charpy V
|
J
|
170
|
150
|
|
|
Hardness, Vickers
|
HV
|
230
|
-
|
|
Temperature
|
° C
|
20
|
-20
|
|
|---|---|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
500
|
-
|
|
|
Tensile strength, Rm
|
MPa
|
600
|
-
|
|
|
Elongation, A
|
%
|
30
|
-
|
|
|
Impact strength, Charpy V
|
J
|
100
|
90
|
Physical properties - all-weld metal
| Thermal conductivity, W/m °C, at 20 oC | 16 |
|---|---|
| Thermal expansion per °C, from 20° to 400°C | 14.5x10-6 |
| Density, g/cm3, at 20 oC | 7.9 |
Corrosion resistance - all-weld metal
Sandvik 23.7.L is resistant to intergranular and pitting corrosion at the same level as 316L. Resistance to stress corrosion cracking is better than 316L
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 | Wire feed | Current | Voltage | Gas |
|---|---|---|---|---|
| mm | m/min | A | V | l/min |
| Short-arc welding | ||||
| 0.8 | 4-8 | 40-120 | 15-19 | 12 |
| 1.0 | 4-8 | 60-140 | 15-21 | 12 |
| Spray-arc welding | ||||
| 1.0 | 6-12 | 140-220 | 23-28 | 18 |
| 1.2 | 5-9 | 180-260 | 24-29 | 18 |
| 1.6 | 3-5 | 230-350 | 25-30 | 18 |
| 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
Short-arc welding is used with light 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 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 | Current | Voltage |
|---|---|---|
| mm | A | V |
| 2.0 | 200-300 | 28-32 |
| 2.4 | 250-400 | 28-32 |
| 3.2 | 300-450 | 29-34 |
| 4.0 | 350-500 | 30-35 |
* LDX 2101 is a trademark owned by Outokumpu OY.
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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