Sandvik 18.8.Mn (Welding wire)
Datasheet updated 2013-04-10 09:15:41 (supersedes all previous editions)
Sandvik 18.8.Mn is a filler material of ER 307 type suitable for joining work-hardenable steels, armour plates, austenitic stainless manganese steels and free-machining steels (such as ASTM 303) and stainless Cr steels with max. 18% Cr.
The grade is used in, for example, the automotive industry for joining dissimilar steels. It is also suitable for overlay welding on carbon and low-alloy steels. Sandvik 18.8.Mn is available as wire and rods for MIG/MAG, TIG and plasma-arc welding.
Standards
- AWS ER (307)
- EN number 18 8 Mn
Product standards
EN ISO 14343
Sandvik 18.8.Mn is a modified version of ER 307 which is the closest AWS grade in AWS A5.9.
Chemical composition - filler metal
| C | Si | Mn | P | S | Cr | Ni | Mo | Co | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.08 | 0.9 | 7.0 | <0.025 | <0.015 | 18 | 8 | <0.3 | <0.5 | <0.10 | <0.060 |
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.
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Ni
|
N
|
|---|---|---|---|---|---|---|---|
|
0.07
|
0.8
|
6
|
0.010
|
0.009
|
18
|
8
|
0.05
|
Microstructure - all-weld metal
Fully austenitic
Mechanical properties weld- metal
| Temperature | oC | 20 |
|---|---|---|
| Yield strength, RP0.2 | MPa | 460 |
| Tensile strength, RM | MPa | 650 |
| Elongation, A5 | % | 41 |
| Reduction in area, Z | % | 61 |
| Impact strength, Charpy V | J | 140 |
| Hardness, Vickers | HV | 200 |
Physical properties - weld metal
|
Temperature, oC
|
20
|
100
|
300
|
500
|
|---|---|---|---|---|
|
Thermal conductivity, W/m
|
15
|
16
|
18
|
20
|
Corrosion properties- weld metal
Sandvik 18.8.Mn has corrosion resistance similar to that of the of the corresponding parent metal. For joints between non alloyed or low alloyed steels and stainless steels resistance to corrosion is of secondary importance.
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
|
| 1)Pulse parameters: | Peak current Background current Frequency |
300 - 400 A 50 - 150 A 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.
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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