OZL – 25B
Permissible spatial positions during welding
OZL – 25B 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).
Surfacing coefficient
14.0 g/ah
Consumption of electrodes
~ 1.4 – 1.45 kg per 1 kg of deposited metal
Application Area. OZL – 25B Welding Electrodes.
Welding of products made of corrosion-resistant, heat-resistant, and high-temperature alloy grade KhN78T; welding of cold-resistant and dissimilar steels and cast iron is possible. Welding in all spatial weld positions with direct current of reverse polarity.
Welding Technique. OZL – 25B Welding Electrodes.
Ensure the production of weld metal with high mechanical and special properties: heat resistance up to 1000°C, long-term strength of 75 MPa at 850°C for 100 hours, corrosion resistance – corrosion rate not exceeding 0.02 mm/year (30% H2SO4 + 10% HNO3 at 80°C for 96 hours).
Regulatory Documents. OZL – 25B Welding Electrodes.
GOST 9466-75, GOST 9467-75.
Corresponding International Standard.
E – 087 – B20 (nickel type)
Main Weldable Materials. OZL – 25B Welding Electrodes.
Welding of products made of heat-resistant and high-temperature alloy KhN78T (EI435) and other nickel alloys. Welding of dissimilar joints (stainless steels, cold-resistant steels, cast iron). For operation under conditions of high temperatures (up to 1000°C) and aggressive environments.
Special Properties. OZL – 25B Welding Electrodes.
The electrodes ensure the production of weld metal with high mechanical and special properties:
• Heat resistance: up to 1000°C
• Long-term strength: 75 MPa at 850°C for 100 hours
• Corrosion resistance: corrosion rate not exceeding 0.02 mm/year (in a solution of 30% H2SO4 + 10% HNO3 at 80°C for 96 hours)
• No intercrystalline corrosion
• Provide high indicators of technological strength of the deposited metal and weld metal.
Chemical Composition of Deposited Metal, %
| Ni | Si | Mn | P | S | Cr | W | Nb | Mo | C | |
| Minimum | Base up to 70% | <1.0 | 1.20 | <0.030 | <0.020 | 18.00 | 1.10 | 1.50 | 1.20 | 0.14 |
| Maximum | Base up to 70% | <1.0 | 2.50 | <0.030 | <0.020 | 22.00 | 0.30 | 3.00 | 2.70 | 0.14 |
Welding Recommendations (Current, A)
| Diameter, mm | Weld Position | ||
| Flat | Vertical | Overhead | |
| 4.0 | 90-120 | 80-100 | 80-100 |
| 5.0 | 130-150 | 90-120 | 90-120 |
We respond quickly to questions on Telegram
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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.
Contacts
Company phone numbers:
+375 (29) 688-27-06
+375 (17) 388-28-02 accountant
+375 (17) 388-28-03 sales department
Email address:
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