Sandvik 22.12.HT (Welding wire)
Datasheet updated 2012-08-02 19:24:02 (supersedes all previous editions)
Sandvik 22.12.HT is an austenitic filler material for welding the high temperature steel grade Sandvik 253 MA*, UNS S30815. It is characterized by high creep strength, good resistance to oxidation and good weldability.
Chemical composition - filler metal
| C | Si | Mn | P | S | Cr | Ni | Mo | N | Ce |
|---|---|---|---|---|---|---|---|---|---|
| max | max | max | |||||||
| 0.08 | 1.6 | 0.5 | 0.025 | 0.015 | 21 | 10 | 0.3 | 0.17 | 0.06 |
Microstructure - all-weld metal
Austenitic matrix with a ferrite content of 6FN according to the DeLong diagram.
Mechanical properties - all-weld metal
|
Temperature
|
oC
|
20
|
600
|
800 |
1000
|
|---|---|---|---|---|---|
|
Yield strength, Rp0,2
|
MPa
|
360
|
-
|
- |
-
|
|
Tensile strength, Rm
|
MPa
|
580
|
-
|
- |
-
|
|
Elongation, A
|
%
|
40
|
-
|
- |
-
|
|
Impact strength, Charpy V
|
J
|
120
|
-
|
- |
-
|
|
Hardness, Vickers
|
HV
|
180
|
-
|
- |
-
|
|
Creep rupture strength,
5 x 105h |
.
|
.
|
100
|
15 |
5
|
Physical properties - all-weld metal
|
Temperature oC
|
20
|
100
|
300
|
500
|
|---|---|---|---|---|
|
Thermal conductivity, W/m
|
14.5
|
16
|
17.5
|
21
|
Thermal expansion per °C, from 20 °C (68 oF) to 400 °C (750 oF) 17.6 x 10-6
Density, g/cm3, at 20 oC (68 oF) 7.8
Corrosion resistance - all-weld metal
Sandvik 22.12.HT has good resistance to oxidation and can be used in air up to 1150°C (2100 oF).
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 | 5-9 | 50-140 | 16-25 | 15 |
| 1.0 | 5-9 | 70-160 | 16-25 | 15 |
| Spray-arc welding | ||||
| 1.0 | 6-12 | 150-230 | 26-31 | 22 |
| 1.2 | 5-9 | 170-280 | 27-32 | 22 |
| 1.6 | 3-5 | 250-370 | 29-33 | 22 |
| 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 thin 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.
Pulsed-arc welding with pure argon as a shielding gas is recommended as the first alternative.
TIG welding
The parameters for TIG welding dependant 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 | 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 |
Recommended flux is Sandvik 15W.
* 253 MA 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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