TST – 15
Permissible spatial positions during welding
TST – 15 Welding Electrodes
Electrodes for welding high-alloy steels
Prices for welding electrodes
Type of coverage
Basic. (Low-hydrogen B).
Current and polarity
Direct current of reverse polarity (DC +, “plus” on the electrode). Welding is performed in all spatial positions except vertical “top-down”.
Surfacing coefficient
10.5 g/ah
Consumption of electrodes
~ 1.7 kg per 1 kg of deposited metal
Weld Structure. TST – 15 Welding Electrodes.
Austenitic with 2-5.5% ferrite phase.
Application Area. TST – 15 Welding Electrodes.
For welding of critical structural assemblies made of austenitic steel grades Kh20N12TL, Kh16N13B, 12Kh18N9T, 12Kh18N12T and similar, operating at temperatures of 570-650°C and high pressure, as well as for welding steels of the same grades when strict requirements for resistance to intercrystalline corrosion are imposed on the weld metal.
Welding in all spatial positions except vertical “top-to-bottom”, with direct current of reverse polarity.
Welding Technique. TST – 15 Welding Electrodes.
If the permissible moisture content in the coating (0.3%) is exceeded, the electrodes must be additionally baked before use at a temperature of 280-330°C for 40-60 minutes.
Regulatory Documents. TST – 15 Welding Electrodes.
GOST 9466-75, E – 10Kh5MF
Corresponding International Standard.
E – 2453 – B20
Main Weldable Materials. TST – 15 Welding Electrodes.
Welding of heat-resistant and corrosion-resistant austenitic steels Kh20N12TL, Kh16N13B, 12Kh18N9T, 12Kh18N12T and similar. For assemblies operating at temperatures of 570-650°C and high pressure, where resistance to intercrystalline corrosion is mandatory.
Special Properties. TST – 15 Welding Electrodes.
Weld metal is resistant to intercrystalline corrosion according to the AM or AMU method, has high long-term strength at operating temperatures. Ferrite phase content in the deposited metal is 2-5.5%.
Chemical Composition of Deposited Metal, %
| Ni | Si | Mn | P | S | Cr | C | Nb | |
| Minimum | 8.50 | <1.3 | 1.00 | <0.030 | <0.020 | 18.00 | 0.05 | 0.70 |
| Maximum | 10.50 | <1.3 | 2.50 | <0.030 | <0.020 | 20.50 | 0.12 | 1.30 |
Welding Recommendations (Current, A)
| Diameter, mm | Weld Position | ||
| Flat | Vertical | Overhead | |
| 3.0 | 90-130 | 80-100 | 80-100 |
| 4.0 | 130-160 | 120-150 | 120-150 |
| 5.0 | 180-220 | 170-200 | not recommended |
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Bottom horizontal or in a boat
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Bottom to the corner
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Horizontal seam on a vertical plane
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Vertical seam for lifting
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Vertical seam for descent
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Ceiling seam
All covered electrodes are sensitive to moisture absorption. Excessive moisture content in the coating can lead to porosity or hydrogen cracking.
However, if the climatic storage conditions meet the following requirements, moisture absorption by the electrodes is minimal:
• 5–15°C at a maximum relative humidity of 60%
• 15–25°C at a maximum relative humidity of 50%
• >25°C at a maximum relative humidity of 40%
At lower temperatures, maintaining the storage temperature 10°C above the ambient temperature is sufficient to achieve the required moisture content level. Cold packages must be allowed to warm up to ambient temperature before opening.
At higher temperatures, the required moisture content in the air can be achieved by dehumidification. The shelf life of electrodes under the above conditions shall not exceed three years.
• Covered electrodes with a basic coating and low hydrogen content must be baked prior to each use whenever requirements regarding the content of diffusible hydrogen and/or the soundness of the deposited metal are specified.
• Stainless steel electrodes with a basic coating may produce porosity during welding if the humidity levels during their storage did not meet the requirements. To restore their original properties, they also need to be baked.
• Electrodes for welding carbon steels with a cellulosic or rutile coating typically do not require baking.
• Electrodes that have suffered serious damage due to exposure to moisture cannot be restored by rebaking and must be rejected.
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