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CHH408
Heat-resisting Steel Welding
Electrode |
AWS A5.5 E9018-B3
DIN ECrMo 2 B 20+
GB E6018-B3 |
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Description:
CHH408 is a potassium
low hydrogen iron powder type, low alloy welding rods. With a trait of
resistance of high temperature and oxidation, it is suitable for fabricating
equipments of chemical and petroleum industries as well as high temperature,
high press pipes, which is fabricated by Cr2.5Mo low alloy steel that work
temperature lower than 550℃.
All position welding is obtained and short arc is recommended. It is should
be backed at a temperature between 350℃-380℃ for 1 hour before welding. The welded piece should be preheated to 300℃ before welding and it is must be tempered at 660℃-690℃ for 1 hour after welding.
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| Chemical
Composition of Deposited Metal(%) |
|
C |
Mn |
Si |
S |
P |
Cr |
Mo |
Standard |
0.05-0.12 |
≤0.90 |
≤0.80 |
≤0.03 |
≤0.03 |
2.00-2.50 |
0.90-1.20 |
Typical |
0.08 |
0.75 |
0.24 |
0.010 |
0.012 |
2.34 |
1.14 |
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| Mechanical Properties of Deposited Metal (690 C x
1) |
|
Yield Point
ReL (MPa) |
Tensile Strength
Rm (MPa) |
Elongation
A (%) |
Impact Value (J) |
20℃ |
Standard |
≥530 |
≥620 |
≥17 |
≥27 |
Typical |
580 |
680 |
20 |
180 |
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X-ray defectoscopy: Ⅰ
Moisture contained in coating flux: ≤0.15% |
| Sizes, Pieces & Recommended Current Range
(AC or 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) |
60-90 |
90-120 |
140-180 |
170-210 |
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