©
COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
IV
4.6.6
Atom
Arc 9018CM
(AWS E9018-B3)
- These 2-1/4% chrome - 1% moly electrodes
are used to weld and match the composition
of the 2-1/4% chrome - 1% moly steels in pressure
piping and power boilers. The chromium-molybdenum content of the weld metal
helps retain appreciable strength at
temperatures up to 800°F. Typical
Mechanical Properties
of Weld
Metal Stress-Relieved
Stress-Relieved
1
hr.
@1275°F.
2
hrs.
@1350°F.
Yield Point, psi
87,000 75,000
Tensile Strength, psi
102,000 91,000
% Elongation (2")
23 27
% Reduction of Area
67 70
Typical
Chemical Composition
of Weld
Metal C
Mn Si
Ni Mo
0.05% 0.75%
0.60% 2.20%
1.05% 4.6.7
Atom
Arc 9018-B3L
(AWS E9018-B3L)
- The low carbon content of this 2-1/4%
chrome - 1% moly electrode makes the
weld metal more crack resistant in heavy sections and allows
lower preheat and interpass temperatures to be used. Typical applications
include: high
temperature power piping, boilers, heat-exchanger and condenser tubes, pressure
vessel plates
and steel castings for high temperature pressure service.
Typical
Mechanical Properties
of Weld
Metal Stress-Relieved
Stress-Relieved
8
hrs.
@1150°F.
8
hrs.
@1350°F.
Yield Point, psi
86,900 69,800
Tensile Strength, psi
103,800 86,400
% Elongation (2")
21 24
% Reduction of Area
67.6 73
Charpy V-Notch Impact @30°F.
60 ft.-lbs. 79
ft.-lbs. Typical
Chemical Composition
of Weld
Metal C
Mn Si
Ni Mo
0.02% 0.74%
0.61% 2.47%
1.10%
