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CHH717
Heat-resisting Steel Welding Rod |
AWS A5.5 E9015-B9
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|
Description:
CHH717
is a sodium
low hydrogen martensite heat resisting low alloy welding rods. It is
suitable for fabricating pipes of supercritical steam turbines and boilers,
which fabricated by martensite heat resisting low alloy steels of
ZG1Cr10MoVNbN or T91/P91. Both preheating temperature and interpass
temperature should be 232℃-288℃
and the weld zone must be tempered at 730℃-760℃
for 6 hours after welding.
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Chemical
Composition of Deposited Metal(%)
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|
C |
Mn |
Si |
S |
P |
Cr |
Ni |
|
Standard |
0.08-0.13 |
≤1.25 |
≤0.30 |
≤0.01 |
≤0.01 |
8.0-10.5 |
≤1.0 |
|
Typical |
0.091 |
0.75 |
0.22 |
0.004 |
0.009 |
9.32 |
0.66 |
|
|
Mo |
Cu |
Al |
N |
Nb |
V |
|
|
Standard |
0.85-1.20 |
≤0.25 |
≤0.04 |
0.02-0.07 |
0.02-0.10 |
0.15-0.30 |
|
|
Typical |
1.03 |
0.020 |
0.005 |
0.03 |
0.053 |
0.21 |
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Mechanical Properties of Deposited Metal (760 C x
6h)
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|
Yield Point
ReL
(MPa) |
Tensile Strength
Rm (MPa) |
Elongation
A (%) |
Impact Value (J) |
|
20℃ |
|
Standard |
≥530 |
≥620 |
≥17 |
≥27 |
|
Typical |
630 |
740 |
21 |
80 |
X-ray defectoscopy:
Ⅰ
Moisture contained in coating flux:
≤0.15%
Sizes, Pieces & Recommended Current Range
(DC+)
|
Size (mm) |
2.5 x 300 |
3.2 x 350 |
4.0 x 400 |
5.0 x 400 |
|
Pieces (5kg) |
≈299 |
≈160 |
≈88 |
≈57 |
|
Current (A) |
70-90 |
80-110 |
140-160 |
160-200 |
