Summary of the invention
Technical problem to be solved by this invention provides a kind of phase stainless steel use sintered flux; Mainly be through rational composition design and preparation technology; Make it have basicity, oxidisability, fusing point, viscosity, surface tension and the interfacial tension that is complementary with the two phase stainless steel welding wire for submerged-arc welding; With weld defect problems such as thorough solution gas load mould, middle crystallization strain line, horizontal dry slag, edge dry slags, and welding conditions are steady, and deslag performance is good; Welding bead width is even, high moderate, the transitions smooth of heap; Coupling ER2209 welding wire is suitable for containing the structure welding and the surface overlaying of Cr 22% type two phase stainless steel, can be met the mechanical property and the ferrite content of requirement.
For the purpose that realizes solving the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of phase stainless steel use sintered flux of the present invention, dry powder component and percentage by weight thereof are: MgO:24~32%, CaF
2: 12~23%, ZrO
2: 12~18%, Al
2O
3: 10~15%, SiO
2: 9~14%, CaO:2~10%, rare earth fluoride: 1~3%, prodan: 0.5~2%, chrome oxide green: 0.5~2%, deoxidier: 0.5~2%, alloying constituent: 2~8%.
In order to strengthen arc stability, the two phase stainless steel sintered flux that the present invention relates to adopts potassium sodium 3:1 waterglass to make binding agent, and the about 1000MPaS of waterglass viscosity, consumption account for 18~26% of solder flux dry powder weight.Further, waterglass viscosity is 700 ~ 1500MPaS.
The specification of described rare earth fluoride is REO>=83%, CeO
2/ REO>=45%, F>=26%.
Described deoxidier is not less than 70% Si-Fe for Si content.
Described alloying constituent contains molybdenum content and is not less than 50% molybdenum-iron 1.5 ~ 2.5%, and surplus is a crome metal.
Further, in the dry powder component of this phase stainless steel use sintered flux, mineral dry powder raw material is all through 100 mesh sieves, and the metal powder raw material is crossed 40 mesh sieves.
Further the optimized technical scheme weldering can also be: a kind of phase stainless steel use sintered flux of the present invention, dry powder component and percentage by weight thereof are: MgO:26~32%, CaF
2: 16~23%, ZrO
2: 12~15%, Al
2O
3: 10~13%, SiO
2: 12~14%, CaO:2~6%, rare earth fluoride: 2~3%, prodan: 0.5~1%, chrome oxide green: 1~2%, deoxidier: 1~2%, alloying constituent: 2~4.5%.
Two phase stainless steel sintered flux of the present invention, its preparation method can for: with solder flux mineral dry powder raw material cross 100 mesh sieves, the metal powder raw material is weighed by formulation ratio after crossing 40 mesh sieves, all powders are put into mixer and are fully done and mix; Add the abundant wet mixing of quantitative sodium silicate binder again, then wet feed is put into the comminutor granulation, the flux particle of making is sent into 200 ~ 250 ℃ of rotation drying ovens and is carried out 40~60min low temperature drying; After the oven dry it is sent into the rotation sintering furnace and carry out high temperature sintering; Sintering temperature is 650~750 ℃, and sintering time is 30~50min, the back cooling of coming out of the stove; Sieve out 12~60 purpose flux particles; Packing is put in storage after the assay was approved, and the solder flux preparation is accomplished.
Details are as follows in the effect of each the dry powder component of two phase stainless steel sintered flux that the present invention relates to:
MgO: having high melt point and stability at elevated temperature, is slag making and the active ingredient that improves flux basicity, can reduce sulphur, the oxygen content of weld metal, improves the weld metal degree of purity.Content is crossed when hanging down, and skull is loose, and it is bad to take off slag, and flux basicity is not enough; Viscosity coefficient of dross is increased, suppress slag and flow, and cause the welding bead surface not only, pit can occur.Mainly add through magnesia.
CaF
2: the salt of meta-alkalescence, fusing point is lower, can reduce the slag surface tension and improve slag fluidity; It is at high temperature relatively more active, decomposes the fluorine gas that produces and can reduce the dividing potential drop of hydrogen in the electric arc, thereby effectively reduce the weld metal diffusible hydrogen content.Content is crossed when hanging down, and can make the not enough and dehydrogenation poor effect of flux basicity; During too high levels, can cause electric arc shakiness and ripple thick.Mainly add through fluorite.
[0015ZrO
2: reduce the active ingredient of slag interfacial tension, under the high temperature can with CaF
2Reaction generates low-melting compound ZrF4, improves the removability of slag significantly, thoroughly solves horizontal dry slag and edge dry slag problem, makes appearance of weld attractive in appearance.Content is crossed when hanging down, and the dry slag problem is separated never thorough; During too high levels,, viscosity coefficient of dross is increased, cause the high temperature removability of slag very good and make face of weld oxidation tint occur simultaneously because its fusing point is high.Mainly add through zircon sand.
Al
2O
3: regulate the active ingredient of slag fusing point and viscosity, can make slag have good flowability, weld metal and mother metal transitions smooth, appearance of weld is attractive in appearance.Content is crossed above-mentioned DeGrain when hanging down, and causes the slag fluidity variation during too high levels, and weld seam is easy to generate defectives such as undercut, gas load mould and slag inclusion.Main through α-Al
2O
3Add.
SiO
2: improve the active ingredient of welding procedure and stable arc, can improve deslag performance and appearance of weld.Content is crossed when hanging down, and electric arc is unstable; During too high levels, can make deposited metal increase silicon, viscosity coefficient of dross is increased.Mainly add through zircon sand and wollastonite.
CaO: the active ingredient that improves flux basicity and deposited metal toughness.During too high levels, electric arc is unstable, and appearance of weld is bad, takes off the slag difficulty, is prone to produce slag inclusion and fuses defectives such as not good.Mainly add through wollastonite.
Rare earth fluoride: deoxidation, desulfurization, the form of field trash in the control weld seam.Content is crossed DeGrain when hanging down, and is prone to cause electric arc unstable during too high levels.
Prodan: make appearance of weld active ingredient attractive in appearance.Add when an amount of, ripple is tiny, and the edge is more straight, and width is even, and heap is high moderate, with the mother metal transitions smooth; Content is crossed when hanging down, above DeGrain; During too high levels, then the deposited metal siliconising is serious.
Chrome oxide green: improve the active ingredient of taking off slag and appearance of weld, the Cr that can reduce the generation of liquid metal and slag interface is by SiO
2Be oxidized to Cr
2O
3Possibility, and then the scaling loss that reduces alloying component Cr with occur in the middle of the possibility of crystallization strain line.
Deoxidier: reduce in the weld seam oxygen content with improve the removability of slag, it is bad that content is crossed when low deoxidation effect, then causes the deposited metal siliconising serious during too high levels.Mainly being not less than 70% Si-Fe through Si content adds.
Alloying constituent: alloying in weld metal, with the scaling loss of alloying element in the compensation welding process with regulate the weld metal composition, finally make weld metal be met the chemical composition of requirement and ratio mutually, its content is high can increase solder flux cost.Alloying constituent comprises that mainly purity is not less than 98% crome metal, molybdenum content and is not less than 50% molybdenum-iron, purity and is not less than 98% metallic nickel, purity and is not less than 98% manganese metal and purity and is not less than in 98% the metallic copper one or more.
These technical schemes comprise that improved technical scheme and further improved technical scheme also can mutual combination perhaps combine, thereby reach better technique effect.
Through adopting technique scheme, the present invention has following beneficial effect:
The two phase stainless steel sintered flux that the present invention relates to; Coupling ER2209 welding wire is suitable for the used welding and the built-up welding that contain Cr 22% type two phase stainless steel of industrial circle and bridge bearing structure field such as petrochemical equipment, seawater and sewage treatment equipment, oil and gas pipelines, papermaking equipment; Two phase stainless steel sintered flux coupling ER2209 welding wire of the present invention; Welding conditions are steady; Deslag performance is good, and welding bead width is even, high moderate, the transitions smooth of heap, has thoroughly solved weld defect problems such as the gas load mould that occurs easily in the stainless steel submerged arc welding, middle crystallization strain line, horizontal dry slag, edge dry slag; The deposited metal ferrite content can reach more than 35%, therefore has good mechanical performance and corrosion resisting property.
The specific embodiment
Below in conjunction with embodiment this patent is done further explanation, but the protection domain of this patent includes, but are not limited to embodiment.
[0027(1) solder flux preparation
With solder flux mineral dry powder raw material cross 100 mesh sieves, the metal powder raw material is weighed by formulation ratio after crossing 40 mesh sieves, all powders are put into mixer and are fully done and mix, and add the abundant wet mixing of suitable quantity of water glass binder again; Then wet feed is put into the comminutor granulation, the flux particle of making is sent into 200 ~ 250 ℃ of rotation drying ovens and is carried out 40~60min low temperature drying, after the oven dry it is sent into the rotation sintering furnace and carries out high temperature sintering; Sintering temperature is 650~750 ℃, and sintering time is 30~50min, the back cooling of coming out of the stove; Sieve out 10~60 purpose flux particles; Packing is put in storage after the assay was approved, and the solder flux preparation is accomplished.
(2) embodiment
The constituent content of design has been prepared 3 kinds of solder flux powders according to the present invention, and formula number is F1~F3.Three prescriptions of F1~F3 solder flux all cooperates with the ER2209 welding wire of Φ 3.2mm, and adopting thick 2205 two phase stainless steels of 20mm is that mother metal melts deposited test plate (panel) welding.Flux composition dry powder quality proportioning is listed in table 1, and solder flux preparation technology lists in table 2, and welding conditions see table 3 for details; The solder flux welding technological properties is listed in table 4; ER2209 welding wire chemical composition is listed in table 5, and the deposited metal performance test is carried out with reference to AWS A5.4-2006, and the result lists in table 6.
Table 1 flux composition dry powder quality proportioning
Numbering |
MgO |
CaF
2 |
ZrO
2 |
Al
2O
3 |
SiO
2 |
CaO |
Rare earth fluoride |
Prodan |
Chrome oxide green |
Deoxidier |
Alloying constituent |
F1 |
24 |
12 |
18 |
15 |
9 |
10 |
1 |
2 |
0.5 |
0.5 |
8 |
F2 |
32 |
23 |
12 |
10 |
14 |
2 |
2 |
1 |
1 |
1 |
2 |
F3 |
26 |
16 |
15 |
13 |
12 |
6 |
3 |
0.5 |
2 |
2 |
4.5 |
In the table 1, the specification of rare earth fluoride is REO>=83%, CeO
2/ REO>=45%, F>=26%.
Each prescription waterglass is that potassium sodium 3:1 waterglass is made binding agent, the about 800MPaS of waterglass viscosity of F1, and consumption accounts for 19% of solder flux dry powder weight, and deoxidier is the Si-Fe of Si content 70%, and the molybdenum-iron of crome metal 5.6%, molybdenum content 50% accounts for 2.4% in the alloying constituent; The about 1250MPaS of waterglass viscosity of F3 and F2, consumption accounts for 26% of solder flux dry powder weight, and deoxidier is the Si-Fe of Si content 75%, and alloying constituent is that molybdenum-iron 1.6%, the surplus of molybdenum content 55% is crome metal.
Table 2 solder flux preparation technology
Numbering |
Dried doing time/min |
Waterglass accounts for dry powder proportion/% |
Wet mixing time/min |
The low temperature drying temperature/℃ |
Low temperature drying time/min |
The hyperthermia drying temperature/℃ |
Hyperthermia drying time/min |
Pre-welding treatment |
F1 |
5 |
18 |
5 |
230±10 |
50 |
700±10 |
40 |
350 ℃ * 2h oven dry |
F2 |
5 |
26 |
5 |
230±10 |
50 |
700±10 |
40 |
350 ℃ * 2h oven dry |
F3 |
5 |
22 |
5 |
230±10 |
50 |
700±10 |
40 |
350 ℃ * 2h oven dry |
Table 3 welding conditions
Welding electricity/A |
Welding electricity/V |
Temperature between preheating and road/℃ |
Speed of welding/cm/min |
Polarity |
380~400 |
30±2 |
Below 150 |
50~80 |
Dc reverse connection |
Table 4 welding technological properties
Numbering |
Arc stability |
Deslag performance |
Middle crystallization strain line |
Welding bead width |
The welding bead heap is high |
With the mother metal transition |
Welding bead comprehensively is shaped |
F1 |
Well |
High temperature does not take off, and it is easy that low temperature takes off slag, does not have horizontal dry slag, slightly the edge dry slag |
Do not have |
Moderate |
Moderate |
Smoothly |
Very |
F2 |
Well |
High temperature does not take off, and it is easy that low temperature takes off slag, does not have horizontal dry slag, the non-flanged dry slag |
Slightly |
Moderate |
Moderate |
Smoothly |
Very |
F3 |
Well |
High temperature does not take off, and it is easy that low temperature takes off slag, does not have horizontal dry slag, the non-flanged dry slag |
Do not have |
Moderate |
Moderate |
Smoothly |
Excellent |
Table 5 ER2209 welding wire chemical composition
Numbering |
C |
Cr |
Ni |
Mo |
Mn |
Si |
P |
S |
N |
Cu |
ER2209 |
0.022 |
23.08 |
8.92 |
3.06 |
1.54 |
0.49 |
0.022 |
0.0015 |
0.154 |
0.134 |
AWS A5.9-2006 |
≤0.03 |
21.5~23.5 |
7.5~9.5 |
2.5~3.5 |
0.5~2.0 |
≤0.90 |
≤0.03 |
≤0.03 |
0.08~2.0 |
≤0.75 |
Table 6 deposited metal The performance test results
Numbering |
Main alloy element content/% |
?
|
?
|
?
|
?
|
?
|
?
|
Mechanical property |
?
|
?
|
?
|
Ferrite content/% |
?
|
C |
Cr |
Ni |
Mo |
Mn |
Si |
N |
Rm/MPa |
R
p0.2/MPa
|
δ
5/%
|
-20 ℃ of ballistic work/J |
?
|
F1 |
0.030 |
23.2 |
8.82 |
3.33 |
0.90 |
0.78 |
0.127 |
820 |
640 |
27 |
55,47,50 |
39 |
F2 |
0.025 |
22.80 |
8.84 |
3.02 |
1.02 |
0.72 |
0.130 |
810 |
620 |
23 |
43,40,46 |
35 |
F3 |
0.027 |
23.02 |
8.76 |
3.26 |
0.98 |
0.76 |
0.120 |
815 |
630 |
25 |
51,48,45 |
37 |
AWSA5.4-2006 |
≤0.04 |
21.5~23.5 |
8.5~10.5 |
2.5~3.5 |
0.5~2.0 |
≤1.00 |
0.08~2.0 |
690 |
―― |
20 |
―― |
―― |