Applications
Welding of 9% Cr-1% Mo steel used for super-heater tubes of high temperature and high pressure boiler, heater tube for all refining industries.
Characteristics
N-505 is a low hydrogen type electrode for all-position welding, which provides the weld metal of 9% Cr-Mo.
Notes on usage
(1) Dry the electrodes at 325-375°C for about one hour before use.
(2) Preheat at 250-350°C and post heat at 720-780°C.
(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 |
0.07 |
0.33 |
0.48 |
9.51 |
1.14 |
Typical Mechanical Properties of Weld Metal:
Yield Point
N/mm2 (Kgf/mm2) |
Tensile Strength
N/mm2 (Ksi) |
Elongation
(%) |
PWHT |
500 |
670 |
26 |
740 deg C x 1 hr |
Size and Recommended Current Range (AC or DC +):
Diameter (mm) |
2.5 |
3.2 |
4.0 |
5.0 |
Length (mm) |
350 |
350 |
400 |
400 |
Ampere |
Flat |
55-85 |
75-115 |
450-160 |
160-220 |
V & OH |
50-80 |
70-110 |
90-150 |
- |
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. |
