Instruction and Application: Low hydrogen type coating of low alloy heat-resistant steel electrode for sodium, has good resistance to fatigue property of welded joints, less than 600 degrees have good resistance to oxidation when hot strength and corrosion properties of hydrogen, sulphur, the mechanical properties of welded joint of high operating characteristics of an electrode, and suitable for field installation and construction, and compared to ordinary steel welding material, has the following characteristics:
1. Deposited metal purity, impurities such as S and P is extremely low, S≤0.10%, P≤0.10%.
2. Excellent low temperature toughness of deposited metal, KV2 ( -20℃) ≥54J.
3. Excellent resistance to temper embrittlement of weld metal, X factor is very low.
4. Has excellent welding performance, all-position welding
Applied to petrochemical, chemical, nuclear, steam turbine cylinder, thermal using conditions harsh, corrosive medium large, complex equipment ASME SA387 Gr. 11 Class 2, (14Cr1MoR), (14Cr1MoR (H)) steel plate welding.
Typical Chemical Composition of the all-welded metal(％)
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
As |
Sn |
Sb |
X-factor |
|
0.07 |
0.20 |
0.75 |
0.007 |
0.003 |
1.23 |
0.55 |
0.003 |
0.001 |
0.001 |
8.2 |
X-factor = (10P+5Sb+4Sn+As) *10-2
Element type to ppm content into, such as 0.01% should be 100ppm into
Mechanical properties of all-weld metal
|
Temperature |
Tensile strength Rm(MPa) |
Yield strength Rp(MPa) |
Elongation A(%) |
Impact Strength KV2(J,-20℃) |
Heat treatment |
|
Room temperature |
590 |
490 |
25 |
169,178,169 |
690℃×6h |
|
475℃ |
- |
410 |
- |
||
|
Room temperature |
550 |
440 |
27 |
155,173,154 |
690℃×20h |
|
475℃ |
- |
390 |
- |
*In practice, the heat treatment system shall be formulated separately by the supply and demand parties or by the conditions of the working conditions (such as the thickness of the specimen).
HD (Mercury method): ≤5.0ml/100g
Deposited metal radio-graphic testing:
According to NB / T 47013.2, the radio-graphic detecting technique should not be less than class AB and the quality grade of deposited metal should not be less than Class I.
Reference current (DC+):
|
Electrodes size（mm) |
φ3.2 |
φ4.0 |
φ5.0 |
|
Welding current(A) |
90-120 |
140-180 |
180-220 |
Notice：
1. Redry the electrode at 350~400°C for 1~2hour.
2.Cleaning the oil stain, rust and moisture of the weldment surface before welding.
3.Operate with short arc and narrow bead welding method, preheating temperature about 150°C, the temperature between different welding bead should be controlled to 150~300°C.
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