Sandvik 19.9.NbSi (Welding wire)
Datasheet updated 2012-08-02 19:26:31 (supersedes all previous editions)
Sandvik 19.9.NbSi is a filler metal particularly suited for MIG welding. It can also be used for TIG and plasma arc welding. It is suitable for joining stainless steels of the 18Cr/8Ni/Nb and 18Cr/8Ni/Ti types. Due to the strengthening effect of niobium, this grade is recommended if the weld metal is exposed to temperatures above 400°C (750oF).
Standards
- AWS ER347Si
- EN number 19 9 Nb Si
Product standards
- EN ISO 14343
- ASME/AWS SFA5.9
Filler metal
| C | Si | Mn | P | S | Cr | Ni | Mo | Co | Cu | Nb |
N
|
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.04 | 0.9 | 1.2 | <0.025 | <0.015 | 19.5 | 10 | <0.5 | <0.2 | <0.2 | >12xC <0.60 |
<0.060
|
Ferrite content
The ferrite number according to DeLong diagram based on aim composition = 10FN.
Chemical composition- all-weld metal
The following data are typical for non heat treated weld metal made by MIG welding with a shielding gas of Ar + 2%O2 and TIG or plasma arc welding with Argon as shielding gas.
| C | Si | Mn | P | S | Cr | Ni | Nb | N |
|---|---|---|---|---|---|---|---|---|
| 0.04 | 0.8 | 1.2 | 0.013 | 0.010 | 19 | 10 | 0.5 | 0.05 |
Microstructure- all-weld metal
Austenitic matrix with a ferrite content of about 9FN according to DeLong.
Mechanical properties- all-weld metal
MIG TIG - typical for non heat treated weld metal
|
Temperature
|
°C
|
20
|
400
|
-196
|
|---|---|---|---|---|
|
Yield strength, RP0.2
|
MPa
|
400
|
320
|
-
|
|
Tensile strength, RM
|
MPa
|
610
|
470
|
-
|
|
Elongation, A5
|
%
|
35
|
23
|
-
|
|
Reduction in area, Z
|
%
|
61
|
50
|
-
|
|
Impact strength, Charpy V
|
J
|
110
|
-
|
60
|
|
Hardness, Vickers
|
HV
|
225
|
-
|
-
|
Physical properties- all-weld metal
|
Temperature °C
|
20
|
100
|
300
|
500
|
|---|---|---|---|---|
|
Thermal conductivity, W/m
|
13
|
14
|
16
|
18
|
Thermal expansion per °C, from 20°C (68 oF) to 400°C (750 oF) 18 x 10-6
Density, g/cm3 8,0
Corrosion properties- weld metal
Sandvik 19.9.NbSi has good resistance to general corrosion and due to its niobium content, good resistance to intercrystalline corrosion.
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 |  |
|
|
|
| 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
|
| Pulsed-arc welding1) | |
|
|
|
| 1.2 |
3-10
|
150-250
|
23-31
|
18
|
Approvals
CE, DB, TÜV
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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