COATING TYPE - Basic
| ГОСТ 9466 — 75 | Э 50А –ТМУ-21У-Ø-УД Е 51 3 — Б20 |
ТУ У 25.9-34142624-014:2017
ISO 2560-A- E 42 А B 2 2
AWS A5.1: Е7015
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PURPOSE AND FIELD OF APPLICATION
Electrodes HR-21U are designed for welding of critical structures and pipelines of carbon and low-alloyed steels, equipment of thermal and nuclear power plants.
APPLICATION CONDITIONS
Welding with electrodes HR-21U is made on DC of reverse polarity in all the spatial positions, except the vertical down. Deposition rate factor – 9,5 g/A hour. Electrode consumption per 1 kg of deposited metal: 1,5 kg. Welding should be done with a short arc on the clean edges.
REDRYING BEFORE WELDING
At the normal storage conditions, the redrying is not required. In case of moisture redrying: 380-400 ºС 60-90 min. Moisture content in the coating should not exceed 0,4%.
CHEMICAL COMPOSITION OF DEPOSITED METAL, %
| Mn | Si | C | P | S |
| 0.70-1.00 | 0.20-0.43 | ≤0.12 | ≤ 0.035 | ≤ 0.030 |
MECHANICAL PROPERTIES OF WELD METAL
| Tensile strength, MPa | Yield strength, MPa |
Elongation, % |
Impact strength, J / сm² +20 ˚С |
| ≥ 510 | ≥ 420 | ≥20 | ≥130 |
Welding is made on DC of reverse polarity (“+” on the electrode).
PACKAGING DATA
| Diameter, mm | Length, mm | Welding current, A | Units per package, pcs | Weight of packing, kg |
| 3 | 350 | 80-110 | 92-93 | 2.5 |
| 4 | 450 | 110-150 | 81-85 | 5 |
WELDING POSITIONS
PA PB PC PF
PE PD
ДСТУ EN ISO 6947
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