Applications
Welding of 2.25% Cr-1% Mo steel used for super-heater tubes and steam pipes of boilers for electric power plant and marine use, equipments for oil refining industries and high temperature synthetic chemical industries.
Characteristics
N-9018-B3 is an iron powder low hydrogen type electrode for 2.25% Cr-1%Mo steel used for main steam pipes etc.Suitable for highly efficient welding of thick steam pipes and repairing of cast steel.
Notes on usage
(1) Dry the electrodes at 325-375ºC for about one hour before use.
(2) Preheat at 200-350ºC and postheat at 680-730ºC.
(3) Adopt back step method or strike the arc on a small steel plate prepared for this particular purpose to prevent blowholes at the arc starting.
(4) Keep the arc as short as possible.
Typical Chemical Composition of Weld Metal (%):
C |
Si |
Mn |
Cr |
Mo |
0.08 |
0.50 |
0.77 |
2.25 |
1.02 |
Typical Mechanical Properties of Weld Metal:
Yield Point
N/mm2 (Kgf/mm2) |
Tensile Strength
N/mm2 (Ksi) |
Elongation
(%) |
PWHT |
680 (99) |
750 (109) |
21 |
690 degrees C x 2 hr |
Size and Recommended Current Range (AC/DC+):
Diameter (mm) |
2.5 |
3.2 |
4.0 |
5.0 |
Length (mm) |
350 |
350 |
400 |
400 |
Ampere |
Flat |
50-75 |
70-110 |
110-155 |
155-200 |
V & OH |
30-70 |
55-105 |
90-140 |
|
Welding Positions:
ALL POSITIONS
Packing:
20 Kg corrugated box, with 4 units of 5 Kg shrinked plastic wrapped paper boxes inside.
Special requests on packing are accepted. |
