Instruction and Application: The combination of wire H09MnNiG and solder SJ18G, SJ18G is ultra low hydrogen sintering flux, alkalinity B > 2.0, for circular granular shape, the particle size is 2.0 ~ 0.28mm (10 ~ 60 mesh).The welding process is excellent, the weld metal is pure, the content of S and P is low, and the comprehensive performance is good.It is suitable for the welding of low temperature steel for liquid container and pipeline, natural gas liquefaction device, such as ASME SA 516Gr.70 (16MnDR) or 15MnNiDR steel.
Typical Chemical Composition of the wire(％)
|
C |
Si |
Mn |
S |
P |
Ni |
|
0.08 |
0.09 |
1.16 |
0.004 |
0.005 |
0.94 |
Typical Chemical Composition of the all-weld metal(％)
|
C |
Si |
Mn |
S |
P |
Ni |
|
0.06 |
0.20 |
1.03 |
0.005 |
0.009 |
0.89 |
Mechanical properties of All-weld metal
|
Temperature |
Tensile strength Rm(MPa) |
Yield strength Rp(MPa) |
Elongation A(%) |
Impact Strength KV2(J,-45℃) |
Heat treatment |
|
Room temperature |
535 |
440 |
29.5 |
174,155,162 |
620℃×2h |
*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).
Physical and chemical analysis of the flux(％)
|
|
Mechanical inclusion |
Moisture content |
S |
P |
|
SJ18G |
0.20 |
0.06 |
0.014 |
0.027 |
HD (Mercury method): ≤ 4.0ml/100g
All-weld 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 all-weld metal should not be less than Class I.
Reference Current (DC﹢)
|
Sizeφ(mm) |
Current (A) |
Volt (V) |
Speed (mm/min) |
|
φ3.2 |
450-500 |
28-32 |
480-520 |
|
φ4.0 |
500-550 |
28-32 |
480-520 |
Notice：
1.Redry the flux at 300-350℃ for 2 hours.
2.Cleaning the oil stain, rust and moisture of the weldment surface before welding.
3.Multi-pass welding must clean the welding slag. Each layer is controlled below 150℃.
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