CN109457196A - A kind of stainless steel tube and its manufactured zinc-plated stainless steel elbow - Google Patents
A kind of stainless steel tube and its manufactured zinc-plated stainless steel elbow Download PDFInfo
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- CN109457196A CN109457196A CN201811631234.0A CN201811631234A CN109457196A CN 109457196 A CN109457196 A CN 109457196A CN 201811631234 A CN201811631234 A CN 201811631234A CN 109457196 A CN109457196 A CN 109457196A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/08—Making alloys containing metallic or non-metallic fibres or filaments by contacting the fibres or filaments with molten metal, e.g. by infiltrating the fibres or filaments placed in a mould
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
- C22C49/08—Iron group metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
Abstract
The present invention relates to stainless steels, disclose a kind of stainless steel tube and its manufactured zinc-plated stainless steel elbow, zinc-plated stainless steel elbow is obtained by the hot-dip coated rear bending of stainless steel tube, stainless steel tube is grouped as by the group of following mass fraction, C:0.26-0.3wt%, Cr:18-19wt%, Al:1.2-1.35wt%, Zr:2.25-2.94wt%, Mn:1.05-1.25wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤0.015wt%, O:0.12-0.16wt%, remaining is Fe and other inevitable impurity；It is the impurity in the aluminium carbide and metal alloy being added during producing that wherein Al, which adds source; Zr addition source is the Zirconium dioxide powder of addition during production; resulting stainless steel tube promotes the galvanized layer combining capacity that galvanizing by dipping is formed; bending process influences zinc-plated film adhesion and continuity small; zinc coat is not easy to be corroded or fall off, and protecting effect is good, so that zinc-plated stainless steel elbow; elbow salt resistance divides permeating corrosion, long service life.
Description
Technical field
The present invention relates to stainless steel, in particular to a kind of stainless steel tube and its manufactured zinc-plated stainless steel elbow.
Background technique
As shown in Figure 1 and Figure 2, existing a kind of zinc-plated stainless steel elbow, including elbow body 1 and it is wrapped in bend pipe sheet
Zinc coat 2 on 1 lateral surface of body.It is additionally provided with bent angle in elbow body 1 simultaneously, bent angle angle and radius can be according to the actual situation
Depending on, it is herein 20cm for bent angle radius, bent angle angle is 90 °.The existing zinc-plated stainless steel elbow processing method is using first warm
Immersion plating layer forms zinc coat 2 outside stainless steel straight tube, zinc-plated being formed to the stainless steel tube progress bending process with zinc coat 2
Stainless steel elbow.
Disadvantage is that first coating facilitates processing in the mode of bending and is convenient for controlling the same of 2 thickness of whole zinc coat
When, exist it is asynchronous with 1 stretcher strain of elbow body in 2 stretcher strain of corner zinc coat, make zinc coat 2 damage and reduce
The combination compactness of zinc coat 2 and pipeline body lateral surface, thus the zinc coat 2 of corner is easily because of extraneous salinity, water penetration mistake
Zinc coat 2 touches steel pipe body lateral surface and causes to corrode, and 2 adhesive force of zinc coat is caused to further decrease and generate bubble or stripping
It falls, so that zinc coat 2 is not had the effect of being effectively protected, therefore have much room for improvement.
Summary of the invention
In view of the deficienciess of the prior art, the first object of the present invention is to provide a kind of stainless steel tube, it is resulting not
Rust steel pipe promotes the galvanized layer combining capacity that galvanizing by dipping is formed, and bending process influences zinc-plated film adhesion and continuity
Small, zinc coat is not easy to be corroded or fall off, and protecting effect is good.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of stainless steel tube, the stainless steel tube are grouped as by the group of following mass fraction,
C:0.26-0.3wt%, Cr:18-19wt%, Al:1.2-1.35wt%, Zr:2.25-2.94wt%, Mn:1.05-
1.25wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤
0.015wt%, O:0.12-0.16wt%, remaining is Fe and other inevitable impurity；
It is the impurity in the aluminium carbide and metal alloy being added during producing that wherein Al, which adds source, and it is to produce that Zr, which adds source,
The Zirconium dioxide powder being added in the process.
By using above-mentioned technical proposal, the addition of Al can reduce the yield strength of stainless steel, convenient for the bending of stainless steel
Processing, when raising stainless steel tube is bent together with zinc coat, the synchronism of the two stretcher strain reduces zinc coat and is damaged and plates
Binding force between zinc layers and stainless steel reduces；
The zirconium dioxide of part is precipitated by the oxygen in abjection zirconium dioxide, and in the case where V promotees to promote during molten steel melt production
Strengthen, enhancing crystal is precipitated, and a large amount of monocrystalline zirconium is thus formed in molten steel under the two effect, monocrystalline zirconium combines it in molten steel
His metallic element and carbon form intermetallic compound, improve the Salt corrosion corrosion of stainless steel itself, reduce micro salinity from zinc-plated
Corrosion after layer damage gap penetration to stainless steel, avoids zinc coat from blistering or peel off and corrosion is caused to further speed up；
Simultaneously when metal zirconium, zirconium dioxide, vanadium and silicon carbide exist simultaneously in stainless steel, stainless steel surface grinds off oxidation film
The binding force for carrying out hot-dip coated resulting zinc coat again afterwards gets a promotion, and bending front and back freezing corrosion effect is with low uncertainty, bending
It is few to zinc coat damage；
In conclusion resulting stainless steel tube promotes the galvanized layer combining capacity that galvanizing by dipping is formed, bending process is to zinc-plated film
Layer adhesive force and continuity influence are small, and zinc coat is not easy to be corroded or fall off, and protecting effect is good.
The present invention is further arranged to: the inevitable impurity includes [H] being dissolved in steel, and [H]≤
0.0002wt%.
By using above-mentioned technical proposal, [H] content being dissolved in steel is low, reduces [H] and is precipitated and in stainless steel tube
Hydrogen molecule is combined into interior fine gap and expands gap, and the fine gap inside stainless steel tube with surface is reduced with this, is mentioned
The toughness of high stainless steel pipe surface, reduce stainless steel tube makes stainless steel surface in conjunction with zinc coat because bending surface gaps deformation
The possibility for forming cavity is reduced, avoids cavity formation from leading to concentration difference inside and outside zinc coat and promote ionic osmotic pressure, further
Slow down salinity permeating corrosion.
The present invention is further arranged to: aluminium carbide is carbonization al whisker in Al addition source.
By using above-mentioned technical proposal, it is added to anti-salinity permeating corrosion effect for the al whisker relatively carbonization aluminium powder that is carbonized
More preferably.
The present invention is further arranged to: the stainless steel further includes Y:0.3-0.5wt%.
By using above-mentioned technical proposal, yttrium is mixed in stainless steel, changes the form of inclusion in stainless steel, and refinement is brilliant
Grain partial size, improves the machinability of stainless steel and its slab, reduces stainless steel tube because folding occurs in hot rolling hot rolling rear surface or draws
The defect of wound improves zinc-plated being tightly combined property of film layer, slows down salinity permeating corrosion；And vanadium can promote the addition effect of enhancing yttrium
Fruit further enhances stainless steel impact flexibility and surface integrity.
The present invention is further arranged to: the stainless steel tube is grouped as by the group of following mass fraction, C:0.28wt%,
Cr:18.72wt%, Al:1.26wt%, Zr:2.72wt%, Mn:1.12wt%, Ni:8.72wt%, V:2.63wt%, Y:
0.35wt%, N:0.07wt%, S:0.002%, P:0.014wt%, O:0.15wt%, remaining is inevitable with other for Fe
Impurity.
By using above-mentioned technical proposal, when stainless steel tube is grouped as by the group of the above mass fraction, zinc film layer combines tight
Close more excellent, salt resistance divides permeating corrosion effect best.
The present invention is further arranged to: the production stage of the stainless steel tube is as follows:
S1: will be in molten iron and steel scrap converter, the conventional top bottom blowing control blowing oxygen of progress presses 0.88-0.92MPa, when out
For steel temperature at 1653-1657 DEG C, phosphorus content in detection molten steel before tapping in S1, converter terminal carbon is 0.03- when control is tapped
0.05wt%, then tap into ladle；
S2: converter whole Argon in tapping process into ladle, when molten steel reaches 1/4 of molten steel maximum capacity in ladle in ladle
When, addition zirconium dioxide, high carbon ferro-chrome, vanadium iron powder, dilval, manganeisen and carbon dust into ladle, and
Above-mentioned add materials is added before when ladle reaches 3/4 of molten steel maximum capacity in ladle by molten steel；
S3: hanging molten steel when molten steel reaches molten steel maximum capacity in ladle in ladle in S2 and pour into LF furnace, and slag former is added simultaneously
Energization slag making, slag making to molten steel adds aluminium carbide after terminating, then carries out soft blow argon, and the soft blow time is greater than 10min, detects molten steel
Ingredient simultaneously adds part material, interval soft blow argon, adjusts molten steel composition and reaches following standard:
C:0.26-0.3wt%, Cr:18-19wt%, Al:1.2-1.35wt%, Zr:2.25-2.94wt%, Mn:1.05-
1.25wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤
0.015wt%, O:0.12-0.16wt%, remaining is Fe, other metallic elements and other inevitable impurity；
S4: after molten steel reaches standard in S3 again, start to feed 250m iron calcium line into molten steel with the wire-feeding velocity of 3-5m/s；Line feeding
After continue to molten steel carry out soft blow argon, the soft blow time be greater than 13min；Blow it is soft after molten steel is drawn and is hung from LF furnace
It send to conticaster；
S5: the molten steel continuous casting shearing of S4 is obtained stainless steel bar stock by conticaster；
S6: hot-puncturing process obtains hollow billet after the stainless steel bar stock of S5 is heated；
S7: cold bundle is carried out to hollow billet obtained by S6 and obtains stainless steel tube.
By using above-mentioned technical proposal, converter terminal carbon index is controlled in S1, as tapping standard, keeps converter tapping molten
Produce when steel that S, P content substantially reduce in gone out molten steel, reduce S, P interference intermetallic compound and generate, and prevent S, P with
The elements such as Cr, V, Mn in conjunction with and be trapped in molten steel, improve the stability of the stainless composition of steel of gained.
The present invention is further arranged to: being put into molten steel after aluminium carbide is coated in S3 with iron sheet.
By using above-mentioned technical proposal, it is convenient for aluminium carbide and mixing of molten steel, improves the gained hot-dip coated shape of stainless steel tube
Divide permeating corrosion effect at the salt resistance after zinc layers.
In view of the deficienciess of the prior art, the second object of the present invention is to provide a kind of zinc-plated stainless steel elbow, it is curved
Salt resistance divides permeating corrosion, long service life at head.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of zinc-plated stainless steel elbow, the zinc-plated stainless steel elbow include elbow body and zinc coat, the zinc-plated stainless steel
After bend pipe forms zinc coat by above-mentioned stainless steel tube is hot-dip coated, then bending process obtains.
In conclusion the invention has the following advantages:
The bending process of stainless steel, stretcher strain both when raising stainless steel tube is bent together with zinc coat are convenient in the addition of 1.Al
Synchronism, reduce that zinc coat is impaired and binding force between zinc coat and stainless steel reduces；In molten steel melt production process
The zirconium dioxide of middle part forms a large amount of monocrystalline zirconium by the oxygen in abjection zirconium dioxide, and in the case where V promotees to promote in molten steel, and
Intermetallic compound is formed, improves the Salt corrosion corrosion of stainless steel itself, while in metal zirconium, zirconium dioxide, vanadium and carbonization
When silicon is existed simultaneously in stainless steel, stainless steel surface grinds off and is got a promotion after oxidation film with the binding force of zinc coat；Thus gained
Stainless steel tube galvanized layer combining capacity that galvanizing by dipping is formed promoted, bending process is to zinc-plated film adhesion and continuity shadow
Sound is small, and zinc coat is not easy to be corroded or fall off, and protecting effect is good；
2. inevitable impurity includes [H] being dissolved in steel, [H]≤0.0002wt%.[H] is reduced to be precipitated and stainless
Hydrogen molecule is combined into fine gap in steel pipe and expands gap, and reduce stainless steel tube makes not because bending surface gaps deformation
Rust steel surface reduces the possibility for forming cavity in conjunction with zinc coat, and cavity formation is avoided to lead to concentration difference inside and outside zinc coat and promote
Into ionic osmotic pressure, further slow down salinity permeating corrosion；
3. mixing yttrium in stainless steel, improve the machinability of stainless steel and its slab, reduces stainless steel tube because of table after hot rolling hot rolling
There is the defect for folding or scratching in face, and improves zinc-plated being tightly combined property of film layer, slows down salinity permeating corrosion；
4. when stainless steel melting, control converter terminal carbon index makes converter tapping melting be tapped when tapping as tapping standard
S, P content substantially reduce in water, reduce S, P interference intermetallic compound and generate, and prevent the elements knot such as S, P and Cr, V, Mn
It closes and is trapped in molten steel, improve the stability of the stainless composition of steel of gained.
5. a kind of zinc-plated stainless steel elbow, zinc-plated stainless steel elbow includes elbow body and zinc coat, and zinc-plated stainless steel is curved
After pipe forms zinc coat by above-mentioned stainless steel tube is hot-dip coated, then bending process obtains, and elbow salt resistance divides permeating corrosion, makes
It is long with the service life.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of zinc-plated stainless steel elbow；
Fig. 2 is the cross-sectional view of zinc-plated stainless steel elbow.
Appended drawing reference: 1, elbow body；2, zinc coat；3, elbow；4, straight pipe.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
As shown in Figure 1 and Figure 2, existing a kind of zinc-plated stainless steel elbow, including elbow body 1 and it is wrapped in bend pipe sheet
Zinc coat 2 on 1 lateral surface of body.The wall thickness and internal diameter of elbow body 1 can according to the actual situation depending on, elbow body 1 herein
Wall thickness is 2.5mm, and the diameter of elbow body 1 is 90mm.
Be additionally provided with bent angle in elbow body 1 simultaneously, bent angle angle and radius can according to the actual situation depending on, be herein curved
Angular radius is 20cm, and bent angle angle is 90 °.Zinc coat 2 is with a thickness of 0.2 ± 0.05 μm.
Elbow body 1 is made by the stainless steel tube of the application herein, zinc-plated stainless steel elbow by the application stainless steel tube
It bends and obtains after hot-dip coated formation zinc coat 2.
Embodiment one,
A kind of stainless steel tube, the stainless steel tube are grouped as by the group of following mass fraction,
C:0.26-0.3wt%, Cr:18-19wt%, Al:1.2-1.35wt%, Zr:2.25-2.94wt%, Mn:1.05-
1.25wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, Y:0.3-0.5wt%, N:0.06-0.08wt%, S≤
0.004wt%, P≤0.015wt%, O:0.12-0.16wt%, [H]≤0.0002wt%, remaining is inevitable with other for Fe
Impurity；
The production stage of above-mentioned stainless steel tube is as follows:
Sl: will be in molten iron and steel scrap converter, the conventional top bottom blowing control blowing oxygen of progress presses 0.88-0.92MPa, when out
For steel temperature at 1653-1657 DEG C, phosphorus content in detection molten steel before tapping in S1, converter terminal carbon is 0.03- when control is tapped
0.05wt%, then tap into ladle；
S2: converter whole Argon in tapping process into ladle, when molten steel reaches 1/4 of molten steel maximum capacity in ladle in ladle
When, addition zirconium dioxide, high carbon ferro-chrome, vanadium iron powder, dilval, manganeisen and carbon dust into ladle, and
Above-mentioned add materials is added before when ladle reaches 3/4 of molten steel maximum capacity in ladle by molten steel；
S3: hanging molten steel when molten steel reaches molten steel maximum capacity in ladle in ladle in S2 and pour into LF furnace, and slag former is added simultaneously
Energization slag making, slag making is added to molten steel by the carbonization al whisker of iron sheet cladding after terminating, then carries out soft blow argon, and the soft blow time is big
It in 10min, detects molten steel composition and adds part material, interval soft blow argon adjusts molten steel composition and reaches following standard:
C:0.26-0.3wt%, Cr:18-19wt%, Al:1.2-1.35wt%, Zr:2.25-2.94wt%, Mn:1.05-
1.25wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤
0.015wt%, O:0.12-0.16wt%, remaining is Fe, other metallic elements and other inevitable impurity；
S4: after molten steel reaches standard in S3 again, start to feed 250m iron calcium line into molten steel with the wire-feeding velocity of 3-5m/s；Line feeding
After continue to molten steel carry out soft blow argon, the soft blow time be greater than 13min；Blow it is soft after molten steel is drawn and is hung from LF furnace
It send to conticaster；
S5: the molten steel continuous casting shearing of S4 is obtained stainless steel bar stock by conticaster；
S6: hot-puncturing process obtains hollow billet after the stainless steel bar stock of S5 is heated；
S7: cold bundle is carried out to hollow billet obtained by S6 and obtains stainless steel tube.
The preparation of stainless steel tube is carried out according to the above technical scheme, and carries out the preparation of zinc-plated stainless steel elbow, stainless steel
Pipe is as follows at being grouped as.
The resulting stainless steel tube of embodiment 1A-1E and zinc-plated stainless steel elbow are tested, test result is as follows.Wherein
Zinc-plated stainless steel tube overall length (elbow calculating arc length) is 61.4cm in sample, and zinc-plated stainless steel tube is located at the both ends straight line of elbow
Equal length, wherein neutral salt spray test is carried out according to the application method recorded in QB/T 3826 in test, as a result to there is base
This hot spot time and the basic hot spot distributing position initially occurred indicate that the basic hot spot distributing position initially occurred is
Start to occur to go out basic hot spot distributing position after 10mim after basic hot spot.
Yield strength and tensile strength are carried out according to the application method recorded in GB/T 228.1.
Comparative example one is set to comparative example five simultaneously.
Comparative example one,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is in S2 that molten steel is added without vanadium iron, adds
Enter the pig iron to substitute, adjusts other essential element component contents in addition to V, Fe and stablize.
Comparative example two,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is in S2 that molten steel is added without zirconium dioxide, adds
Enter the pig iron to substitute, adjusts other essential element component contents in addition to Zr, O and Fe and stablize.
Comparative example three,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is to increase carbon dust dosage in S2, and in S3
Deoxidier is added, is herein carbon dust, reduces in stainless steel tube ingredient O content to 0.01-0.03wt%.
Comparative example four,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is in S2 that molten steel is added without aluminium carbide, is added
The pig iron adjusts other essential element component contents in addition to Al, C and Fe and stablizes to substitute.
Comparative example five,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is in S2 that molten steel is added without aluminium carbide, to add
Enter aluminium ingot and carbon dust substitution, adjusts essential element component content and stablize.
The preparation of stainless steel tube is carried out according to the technical solution of above-mentioned comparative example one to comparative example five, and is carried out zinc-plated stainless
The preparation of steel bend pipe, stainless steel tube are as follows at being grouped as.
| Comparative example one | Comparative example two | Comparative example three | Comparative example four | Comparative example five | |
| C/wt% | 0.28 | 0.28 | 0.28 | 0.04 | 0.28 |
| Cr/wt% | 18.72 | 18.72 | 18.72 | 18.72 | 18.72 |
| A1/wt% | 1.26 | 1.26 | 1.26 | 0 | 1.26 |
| Zr/wt% | 2.63 | 0 | 2.63 | 2.63 | 2.63 |
| Mn/wt% | 1.12 | 1.12 | 1.12 | 1.12 | 1.12 |
| Ni/wt% | 8.72 | 8.72 | 8.72 | 8.72 | 8.72 |
| V/wt% | 0 | 3.12 | 3.12 | 3.12 | 3.12 |
| N/wt% | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 |
| S/wt% | 0.002 | 0.002 | 0.002 | 0.002 | 0.002 |
| P/wt% | 0.014 | 0.014 | 0.014 | 0.014 | 0.014 |
| Y/wt% | 0.35 | 0.35 | 0.35 | 0.35 | 0.35 |
| [H]/wt% | 0.00018 | 0.00018 | 0.00018 | 0.00018 | 0.00018 |
| O/wt% | 0.15 | 0.03 | 0.03 | 0.15 | 0.15 |
Comparative example one to the resulting stainless steel tube of comparative example five and zinc-plated stainless steel elbow is tested.
Comparative example one, comparative example one to comparative example four are it is found that the addition of Al can reduce the yield strength of stainless steel, just
In the bending process of stainless steel；The zirconium dioxide of part is by the oxygen in abjection zirconium dioxide during molten steel melt production, and
The precipitation strength in the case where V promotes forms a large amount of monocrystalline zirconium in molten steel and combines other metallic elements and carbon under the two effect,
Intermetallic compound is formed, the Salt corrosion corrosion of stainless steel itself is improved, micro salinity is reduced from zinc coat and damages gap penetration
Afterwards to the corrosion of stainless steel, avoids zinc coat from blistering or peel off and corrosion is caused to further speed up；Simultaneously in metal zirconium, titanium dioxide
When zirconium, vanadium and silicon carbide are existed simultaneously in stainless steel, stainless steel surface grind off carried out after oxidation film again it is hot-dip coated resulting
The binding force of zinc coat gets a promotion, and bending front and back freezing corrosion effect is with low uncertainty, and bending damages zinc coat few.
In conclusion resulting stainless steel tube promotes the galvanized layer combining capacity that galvanizing by dipping is formed, bending process is to plating
Zinc film adhesion and continuity influence are small, and zinc coat is not easy to be corroded or fall off, and protecting effect is good.
Embodiment two,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is that the content of [H] of stainless steel tube is
0.0003-0.0006。
| Embodiment 2A | Embodiment 2B | Embodiment 2C | |
| [H]/wt% | 0.00030 | 0.00042 | 0.00056 |
Embodiment three,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is that molten steel is in S2 with the aluminium powder substitution that is carbonized
The al whisker that is carbonized is added, and adjusts essential element component content and stablize.
Example IV,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is in S2 to be added without yttrium iron alloy in molten steel,
It is substituted and is added with the pig iron, and adjusted other essential element component contents in addition to Y and Fe and stablize.
Comparative example six,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is that converter terminal carbon index is controlled in S1 is
Molten steel meets following standard: C:0.26-0.3wt%, Cr:18-19wt%, Al:1.2- in 0.25-0.3wt%, S3
1.35wt%, Zr:2.25-2.94wt%, Mn:1.05-1.25wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:
0.06-0.08wt%, O:0.12-0.16wt%.
Comparative example seven,
A kind of stainless steel tube, based on the basis of embodiment 1B, difference place is in S3 aluminium carbide from above direct plungeing into steel
In water.
Stainless steel tube is carried out according to the technical solution of above-described embodiment two to example IV, comparative example six and comparative example seven
Preparation, and the preparation of zinc-plated stainless steel elbow is carried out, stainless steel tube is as follows at being grouped as.
Comparative example one to the resulting stainless steel tube of comparative example five and zinc-plated stainless steel elbow is tested.
With embodiment two it is found that [H] content being dissolved in steel is low, reduction [H] is precipitated and not comparative example one
It is combined into hydrogen molecule in fine gap in rust steel pipe and expands gap, the tiny seam inside stainless steel tube with surface is reduced with this
Gap, improves the toughness of stainless steel pipe surface, reduce stainless steel tube make because bending surface gaps deformation stainless steel surface with it is zinc-plated
Layer forms the possibility of cavity in conjunction with reducing, and cavity formation is avoided to lead to concentration difference inside and outside zinc coat and promote ionic osmotic pressure,
Further slow down salinity permeating corrosion.
Comparative example one and embodiment three are it is found that be added to anti-salinity infiltration corruption for carbonization al whisker relatively carbonization aluminium powder
Lose better effect.
Comparative example one and example IV change the form of inclusion in stainless steel it is found that mix yttrium in stainless steel,
Size of microcrystal is refined, the machinability of stainless steel and its slab is improved, reduces stainless steel tube because hot rolling hot rolling rear surface is rolled over
Defect that is folded or scratching, improves zinc-plated being tightly combined property of film layer, slows down salinity permeating corrosion；And vanadium can promote adding for enhancing yttrium
Add effect, further enhances stainless steel impact flexibility and surface integrity.
Comparative example one and comparative example six it is found that in S1 control converter terminal carbon index, as tapping standard, make converter
S, P content substantially reduce in gone out molten steel when tapping melting tapping, reduce S, P interference intermetallic compound and generate, and prevent
S, it is trapped in molten steel in conjunction with the elements such as P and Cr, V, Mn, improves the stability of the stainless composition of steel of gained.
Comparative example one and comparative example seven after aluminium carbide iron sheet cladding it is found that put into molten steel.By using above-mentioned
Technical solution is convenient for aluminium carbide and mixing of molten steel, improves the hot-dip coated salt resistance point infiltration formed after zinc layers of gained stainless steel tube
Corrosive effect.
Above-mentioned specific embodiment is only explanation of the invention, is not limitation of the present invention, art technology
Personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as
All by the protection of Patent Law in scope of the presently claimed invention.
Claims (8)
1. a kind of stainless steel tube, which is characterized in that the stainless steel tube is grouped as by the group of following mass fraction,
C:0.26-0.3wt%, Cr:18-19wt%, Al:1.2-1.35wt%, Zr:2.25-2.94wt%, Mn:1.05-1.25wt%,
Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤0.015wt%, O:0.12-
0.16wt%, remaining is Fe and other inevitable impurity；
It is the impurity in the aluminium carbide and metal alloy being added during producing that wherein Al, which adds source, and it is to produce that Zr, which adds source,
The Zirconium dioxide powder being added in the process.
2. a kind of stainless steel tube according to claim 1, which is characterized in that the inevitable impurity includes being dissolved in
[H] in steel, [the H]≤0.0002wt%.
3. a kind of stainless steel tube according to claim 1, which is characterized in that aluminium carbide is carbonization in Al addition source
Al whisker.
4. a kind of stainless steel tube according to claim 1, which is characterized in that the stainless steel further includes Y:0.3-
0.5wt%。
5. a kind of stainless steel tube according to claim 1, which is characterized in that the stainless steel tube is by following mass fraction
Group is grouped as, C:0.28wt%, Cr:18.72wt%, Al:1.26wt%, Zr:2.72wt%, Mn:1.12wt%, Ni:8.72wt%, V:
2.63wt%, Y:0.35wt%, N:0.07wt%, S:0.002%, P:0.014wt%, O:0.15wt%, remaining can not with other for Fe
The impurity avoided.
6. a kind of stainless steel tube according to claim 1, which is characterized in that the production stage of the stainless steel tube is as follows:
S1: will be in molten iron and steel scrap converter, the conventional top bottom blowing control blowing oxygen of progress presses 0.88-0.92MPa, when out
For steel temperature at 1653-1657 DEG C, phosphorus content in detection molten steel before tapping in S1, converter terminal carbon is 0.03- when control is tapped
0.05wt%, then tap into ladle；
S2: converter whole Argon in tapping process into ladle, when molten steel reaches 1/4 of molten steel maximum capacity in ladle in ladle
When, addition zirconium dioxide, high carbon ferro-chrome, vanadium iron powder, dilval, manganeisen and carbon dust into ladle, and
Above-mentioned add materials is added before when ladle reaches 3/4 of molten steel maximum capacity in ladle by molten steel；
S3: hanging molten steel when molten steel reaches molten steel maximum capacity in ladle in ladle in S2 and pour into LF furnace, and slag former is added simultaneously
Energization slag making, slag making to molten steel adds aluminium carbide after terminating, then carries out soft blow argon, and the soft blow time is greater than 10min, detects molten steel
Ingredient simultaneously adds part material, interval soft blow argon, adjusts molten steel composition and reaches following standard:
C:0.26-0.3wt%, Cr:18-19wt%, Al:1.2-1.35wt%, Zr:2.25-2.94wt%, Mn:1.05-1.25wt%,
Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤0.015wt%, O:0.12-
0.16wt%, remaining is Fe, other metallic elements and other inevitable impurity；
S4: after molten steel reaches standard in S3 again, start to feed 250m iron calcium line into molten steel with the wire-feeding velocity of 3-5m/s；Line feeding
After continue to molten steel carry out soft blow argon, the soft blow time be greater than 13min；Blow it is soft after molten steel is drawn and is hung from LF furnace
It send to conticaster；
S5: the molten steel continuous casting shearing of S4 is obtained stainless steel bar stock by conticaster；
S6: hot-puncturing process obtains hollow billet after the stainless steel bar stock of S5 is heated；
S7: cold bundle is carried out to hollow billet obtained by S6 and obtains stainless steel tube.
7. a kind of stainless steel tube according to claim 6, which is characterized in that put into steel after aluminium carbide is coated in S3 with iron sheet
In water.
8. a kind of zinc-plated stainless steel elbow, which is characterized in that the zinc-plated stainless steel elbow includes elbow body (1) and zinc coat
(2), zinc-plated stainless steel elbow stainless steel tube as described in claim 1-7 is hot-dip coated form zinc coat (2) after, then it is curved
Folding processing obtains.
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Application publication date: 20190312 |