Instruction and Application: Austenitic-ferritic duplex stainless steel welds the belt. ARC surfacing with SJ225 solders used electro-slag surfacing when used with SJ25B flux. Metal cladding with austenite-ferrite dual phase structure, excellent performance and corrosion resistance. Flux process performance, stable welding process, slag off easy, smooth weld bead surface, fuse good. Apply to petrochemicals, coal chemical industry, nuclear power equipment, such as corrosion resistance of austenite-ferrite dual phase stainless steel (first, second and second-tier or above) for surfacing.
Typical Chemical Composition(%):
|
C |
Si |
Mn |
S |
P |
Cr |
Ni |
Mo |
N |
δFe |
Strip H2307 |
0.021 |
0.29 |
1.58 |
0.006 |
0.019 |
22.65 |
7.27 |
3.04 |
0.16 |
- |
All-welded Metal(SAW) |
0.026 |
0.59 |
0.89 |
0.008 |
0.022 |
21.77 |
6.86 |
2.70 |
0.17 |
50.5 |
All-welded Metal(ESW) |
0.024 |
0.49 |
1.08 |
0.009 |
0.021 |
21.97 |
7.12 |
2.93 |
0.16 |
57.1 |
Physical and chemical analysis of the flux(%)
|
Mechanical inclusion |
S |
P |
SJ225 |
0.13 |
0.025 |
0.020 |
SJ25B |
0.11 |
0.020 |
0.014 |
Surfacing layer bending performance: After lateral bending test,the sample surface of the surfacing layer shall not be any greater than 1.5mm gap,above the fusion line shall not be any greater than 3mm gap.
Surfacing layer of non-destructive testing: Ultrasonic testing and penetration testing, According to the provisions of NB/T 470130 test results should not be any cracks and lack of fusion.
Reference range:(DC+)
Welding Method |
Size (mm) |
Amperage (A) |
Volt (V) |
Speed (mm/min) |
SAW |
0.4×50 |
600-800 |
28-30 |
150-200 |
0.5×60 |
800-1000 |
28-30 |
150-200 |
|
ESW |
0.4×50 |
700-900 |
25-27 |
150-220 |
0.5×60 |
1000-1200 |
25-27 |
150-220 |
Notice:
1.Redry the flux at 300℃-350℃ for 1hours.
2.The welding consumables surface rust, oil and other impurities must be cleaned up.
3.The base metal should be preheated to 150 ° C before welding. The interpass temperature should be below 250℃.
4.To ensure the quality of welding, the thickness of the transition layer should be guaranteed between 3.0 and 3.5mm, the corrosion layer thickness must be maintained between 3.5-4.0mm.
5.Appropriate the surfacing position to the level to about 2 º uphill welding.
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