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Cromotherme-12 is a lime-fluoride type electrode yielding a deposit containing 11Cr - 0.5Ni - 1.0Mo - 0.3V - 0.5W. The weld metal has excellent creep and oxidation resistant properties up to 700°C. The electrode is used for welding creep resistant 12Cr steels in turbines, steam boilers and chemical plant, where operating temperatures of the order of 600°C are encountered. Following are some of the creep-resistant steels that can be welded.
DIN: X 20 Cr Mo 12 1, X 22 Cr Mo V 12 1 , X 20 Cr Mo W V 12 1, G X 22 Cr Mo MV 12 1
1. Ensure the electrodes are dry. Re-dry the electrodes at 300°C for 2 hours.
2. Use short arc and stringer bead.
Element | C | Mn | Si | S | P | Cr | Mo | Ni | V | W |
Percent | 0.18 | 0.90 | 0.40 | 0.020 | 0.020 | 11.0 | 1.00 | 0.50 | 0.30 | 0.50 |
(PWHT : 740°C-780°C FOR 2 HRS)
UTS | YS | Elongation | CVN Impact Strength |
(MPa) | (MPa) | (L= 5d)% | At +20°C (Joules) |
730 | 660 | 18 | 50 |
Size (mm) | 5x350 | 4x350 | 3.15x350 | 2.5x350 |
Current Range (Amps) | 180-220 | 140-180 | 100-140 | 70-90 |
Qty. (Pcs./Carton) | 35 | 55 | 75 | 125 |