Sandvik 19.9.Nb (Welding wire)
Datasheet updated 2012-08-17 14:52:01 (supersedes all previous editions)
Filler metal Sandvik 19.9.Nb is suitable for joining stainless steels of the 18Cr/8Ni/Nb and 18Cr/8Ni/Ti types. Due to the strenghtening effect of niobium, this grade is recommended if the weld metal will be exposed to temperatures above 400°C (750oF). It is used for MIG/MAG-, TIG-, plasma-arc and submerged-arc welding.
Standards
- AWS ER347
- EN number 19 9 Nb
Product standards
- EN ISO 14343
- ASME/AWS SFA5.9
Filler metal
| C | Si | Mn | P | S | Cr | Ni | Mo | Co | Cu | Nb | N |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.03 | 0.4 | 1.3 | <0.025 | <0.015 | 19.5 | 9.5 | <0.3 | <0.05 | <0.10 | >12xC <0.7 |
<0.07 |
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 |
|---|---|---|---|---|---|---|---|---|
| 0.03 | 0.4 | 1.2 | 0.013 | 0.013 | 19.5 | 9.5 | 0.55 | 0.05 |
The following data are typical for weld metal made by SAW using the flux 15W.
| C | Si | Mn | P | S | Cr | Ni | Nb | N |
|---|---|---|---|---|---|---|---|---|
| 0.03 | 0.5 | 0,9 | 0.02 | 0.013 | 19 | 9.5 | 0.5 | 0.05 |
Microstructure- all-weld metal
Austenitic matrix with a ferrite content of about 8FN 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
|
340
|
-
|
|
Tensile strength, RM
|
MPa
|
610
|
560
|
-
|
|
Elongation, A5
|
%
|
42
|
28
|
-
|
|
Reduction in area, Z
|
%
|
73
|
-
|
-
|
|
Impact strength, Charpy V
|
J
|
150
|
-
|
50
|
|
Hardness, Vickers
|
HV
|
160
|
-
|
-
|
|
Temperatures
|
°C
|
.
|
600
|
700
|
|
Creep rupture strength
5 x 104h |
MPa
|
.
|
135
|
50
|
MIG TIG - typical for non heat treated weld metal
| Temperature | ° C | 20 |
|---|---|---|
| Yield strength, RP0.2 | MPa | 400 |
| Tensile strength, Rm | MPa | 600 |
| Elongation, A | % | 35 |
| Impact strength, Charpy V | J | 80 |
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- all-weld metal
Sandvik 19.9.Nb 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 |  |
|
|
|
| 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
Sandvik can provide recommendations for shielding gases.
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 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
|
| 4.0 |
350-500
|
30-35
|
Recommended welding flux is Sandvik 15W.
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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