CN109652737A - A kind of stainless steel and its manufactured stainless-steel thin-wall pipe of resistance to chlorine corrosion - Google Patents
A kind of stainless steel and its manufactured stainless-steel thin-wall pipe of resistance to chlorine corrosion Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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Abstract
The present invention relates to stainless steels, disclose the stainless steel and its manufactured stainless-steel thin-wall pipe of a kind of resistance to chlorine corrosion, stainless-steel thin-wall pipe is obtained by a kind of stainless-steel cold-rolling of resistance to chlorine corrosion, a kind of stainless steel of resistance to chlorine corrosion melts, it is grouped as by the group of following mass fraction, C:0.13-0.16wt%, Cr:18-19wt%, Si:0.8-0.95wt%, Zr:2.22-3.05wt%, Mn:1.2-1.5wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤0.015wt%, it is impurity in silicon carbide and metal alloy that wherein Si adding raw materials, which are source, Zr adding raw materials are dioxy Change zirconium powder, O content is 0.23-0.32wt% in the stainless steel, remaining ingredient is Fe and other inevitable impurity, stainless steel has good resistance to chlorine corrosion, the stainless steel under chloride ion-containing environment to corroding slowly, so that the stainless-steel thin-wall pipe made of its system is in chloride ion-containing environment long service life.
Description
Technical field
The present invention relates to stainless steel, in particular to the stainless steel and its manufactured stainless-steel thin-wall pipe of a kind of resistance to chlorine corrosion.
Background technique
Thin-wall stainless steel tubing refers to the stainless steel pipes that the ratio between wall thickness and outer diameter are not more than 6%, with anti-oxidant good
It is good, be not easy to corrode, while the advantage that pipeline quality is light is frequently utilized for the conveying of low-pressure medium, as tap water pipe line indoors
It builds.
The effect of thin-wall stainless steel tubing anti-corrosion relies on the chromium, nickel element of certain content in its material stainless steel and deposits
, common are 304 stainless steels, Cr content in 18wt% or more, Ni content in 8wt% or more, while also meet C≤
0.08wt%, Mn≤2.00wt%, P≤0.045wt%, S≤0.030wt%, Si≤1.00, Cr:18.0-20.0wt%, Ni
For 8.0-10.5.
Disadvantage is that existing tap water is chlorine-containing disinfectant such as chlorine, chlorine dioxide etc. using disinfectant, disappear
Poison and waterworks filtering after, chloride ion is still contained in tap water；And stainless steel corrodes in environment in the presence of chloride ion
Quickly, even more than common mild steel, leading to stainless steel pipes, inside corrosion condition is tight compared with outside in practical usage situations
Weight, stainless steel pipes actual life is reduced by corrosion on the inside of stainless steel pipes, therefore is had 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 of resistance to chlorine corrosion,
With good resistance to chlorine corrosion, slowly to corrosion under chloride ion-containing environment, long service life.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of stainless steel of resistance to chlorine corrosion, the stainless steel are melted, are grouped as by the group of following mass fraction,
C:0.13-0.16wt%, Cr:18-19wt%, Si:0.8-0.95wt%, Zr:2.22-3.05wt%, Mn:1.2-
1.5wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤
0.015wt%, it is impurity in silicon carbide and metal alloy that wherein Si adding raw materials, which are source, and Zr adding raw materials are titanium dioxide
Zirconium powder, O content is 0.23-0.32wt% in the stainless steel, remaining ingredient is Fe and other inevitable impurity.
By using above-mentioned technical proposal, zirconium dioxide is white odorless, tasteless crystal under usual condition, be insoluble in water,
Hydrochloric acid and dilute sulfuric acid, chemical property torpescence, and with high-melting-point, high resistivity, high refractive index and low thermal coefficient of expansion property
Matter；Silicon carbide is used as deoxidier herein, reacts in molten steel melting with zirconium dioxide, deviates from the oxygen in zirconium dioxide, and carbon
While SiClx is as deoxidier, it can promote crystal and refinement be precipitated, while vanadium can promote precipitation strength, enhancing crystal is precipitated, by
Form a large amount of small monocrystalline zirconium under both this effect in molten steel, monocrystalline zirconium combined in molten steel other metallic elements and
Carbon forms intermetallic compound, improves the chlorine-resistant corrosivity of the application stainless steel itself；
Simultaneously after stainless steel machine-shaping, stainless steel surface one layer of zirconium oxide film layer of oxidizable formation hinders chloride ion and iron
Or the contact of other metallic elements, improve the chlorine-resistant corrosivity of the application stainless steel products；
Furthermore when the application discovery remains partially carbonized silicon and zirconium oxide in stainless steel, the chlorine-resistant corrosivity of stainless steel can
It is further enhanced；
In conclusion the stainless steel of the application has good resistance to chlorine corrosion, corrodes slowly under chloride ion-containing environment, use the longevity
Life length.
The present invention is further arranged to: the Si adding raw materials are that the silicon carbide in source is silicon carbide powder, powder grain
Diameter is not more than 0.8 μm.
It is mixed with molten steel for silicon carbide powder is compared with silicon carbide whisker, silicon carbide powder by using above-mentioned technical proposal
It is good to close effect, is easy to Zirconium dioxide powder contact, improves deoxidation effect, zirconium is promoted to be precipitated, improve the chlorine-resistant of the application stainless steel
Corrosivity.
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
Fine gap in be combined into hydrogen molecule, with this reduce in the fine gap of stainless steel because pressure occur transcrystalline embrittlement, improve
The toughness of stainless steel band, and the fine gap reduced in stainless steel are expanded, and hinder chloride ion corrosion stainless steel surface or from quilt
The stainless steel surface of destruction, which penetrates into inside stainless steel, to be corroded.
The present invention is further arranged to: the zirconium dioxide of the adding raw materials of the Zr is the zirconium dioxide of melting recrystallization
Crushing obtains.
After by using above-mentioned technical proposal, the purity of zirconium dioxide is improved, while the crystal phase of zirconium dioxide is reformed,
The zirconium dioxide remained in stainless steel gets a promotion to the improvement effect of stainless steel chlorine-resistant corrosive nature.
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, to improve the intensity and impact flexibility of stainless steel and its slab, and improve stainless steel and its slab in turn can
Processability avoids stainless steel hot-rolling rear surface from the defect for folding or scratching occur, and improves resistance of the stainless steel to Chloride Attack；
And vanadium can promote the additive effect of enhancing yttrium, further enhance stainless steel impact flexibility and surface integrity.
The present invention is further arranged to: the stainless steel is grouped as by the group of following mass fraction,
C:1.24wt%, Cr:18.66wt%, Si:1.4wt%, Zr:2.5wt%, Mn:1.3wt%, Ni:8.5wt%, V:
3wt%, N:0.06wt%, S:0.002wt%, P:0.015wt%, O:2.0wt%, remaining ingredient is Fe and other are inevitable
Impurity.
By using above-mentioned technical proposal, when stainless steel is grouped as by the group of the above mass fraction, chlorine-resistant corrosive nature
It is more excellent, and machinability is strong, tensile strength is big.
The present invention is further arranged to: the production stage of the stainless steel is as follows:
S1: will be in molten iron and steel scrap converter, the conventional top bottom blowing control blowing oxygen of progress presses 0.80-0.85MPa, when out
Steel temperature is tapped at 1635-1642 DEG C, then into ladle；
S2: zirconium dioxide, high carbon ferro-chrome, vanadium iron are added into ladle for converter whole Argon in tapping process into ladle
Powder, dilval, manganeisen and silicon carbide；
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 carries out soft blow argon to molten steel after slag making, and the soft blow time is greater than 10min, detects molten steel composition and adds part
Raw material, interval soft blow argon adjust molten steel composition and reach following standard:
C:0.13-0.16wt%, Cr:18-19wt%, Si:0.8-0.95wt%, Zr:2.22-3.05wt%, Mn:1.2-
1.5wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤d-0.004wt%, P≤
0.015wt%, remaining ingredient are Fe 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: after the stainless steel bar stock of S5 is put into burial pit slow cooling to room temperature, product stainless steel is obtained.
By using above-mentioned technical proposal, a soft blow argon is first carried out after slag making, by zirconium monocrystalline and intermetallic
Object promotion is distributed to molten steel entirety, and the soft blow argon again after line feeding floats and removes newly generated steel slag.
The present invention is further arranged to: in S2 when molten steel reaches 1/4 of molten steel maximum capacity in ladle in ladle, being added
Zirconium oxide, high carbon ferro-chrome, vanadium iron powder, dilval, manganeisen and silicon carbide, and steel is reached by molten steel in ladle
Above-mentioned add materials is added before when wrapping the 3/4 of interior molten steel maximum capacity.
By using above-mentioned technical proposal, so that zirconium dioxide and silicon carbide can be sufficiently mixed the molten steel being dispersed in ladle
In, promote the production of zirconium monocrystalline and the dispersion of intermetallic compound, improves the chlorine-resistant corrosivity of stainless steel.
The present invention is further arranged to: phosphorus content in detection molten steel before tapping in S1, converter terminal carbon is when control is tapped
0.03-0.05wt%.
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, and avoid to remove and being detained
S, P element and the trouble refined again.
In view of the deficienciess of the prior art, the second object of the present invention is to provide a kind of stainless-steel thin-wall pipe, it is defeated
When sending tap water, inside is not perishable, long service life.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of stainless-steel thin-wall pipe, the stainless-steel thin-wall pipe are obtained by a kind of stainless-steel cold-rolling of above-mentioned resistance to chlorine corrosion.
By using above-mentioned technical proposal, stainless-steel thin-wall pipe anti-chlorine ion corrosion, when conveying tap water, inside is not easy
Corrosion, long service life.
In conclusion the invention has the following advantages:
1. silicon carbide, which is reacted when molten steel is melted with zirconium dioxide, carries out deoxidation, while silicon carbide has both and promotes crystal that refinement is precipitated
Effect, vanadium has both the effect for promoting precipitation strength, and the two, which acts on, forms a large amount of small monocrystalline zirconiums, monocrystalline zirconium knot in lower molten steel
It closes other metallic elements and carbon forms intermetallic compound, improve the chlorine-resistant corrosivity of stainless steel itself；And stainless steel is processed
After molding, stainless steel surface one layer of zirconium oxide film layer of oxidizable formation hinders chloride ion to contact with iron or other metallic elements, into
One step stainless steel chlorine-resistant corrosivity, so that stainless steel has good resistance to chlorine corrosion, it is slow to corroding under chloride ion-containing environment
Slowly, long service life；
2. remain partially carbonized silicon and zirconium oxide in stainless steel, the chlorine-resistant corrosivity of stainless steel can be further increased；
3. silicon carbide is silicon carbide powder, zirconium dioxide is that the zirconium dioxide of melting recrystallization crushes to obtain, and improves stainless steel
Chlorine-resistant corrosivity is good；
4. inevitable impurity includes [H] being dissolved in steel, [H]≤0.0002wt%, reduces [H] and be precipitated and stainless
It is combined into hydrogen molecule in fine gap in steel, is reduced with this because transcrystalline embrittlement occurs for pressure in the fine gap of stainless steel,
Improve stainless steel band toughness, and reduce stainless steel fine gap expand, hinder chloride ion corrosion stainless steel surface or
It penetrates into inside stainless steel and corrodes from the stainless steel surface being destroyed；
5. stainless steel further includes Y:0.3-0.5wt%, vanadium can promote the effect of enhancing yttrium refinement crystal grain, change inner clip in stainless steel
The form of sundries refines size of microcrystal, improves the machinability of stainless steel and its slab, and stainless steel hot-rolling rear surface is avoided to occur
The defect for folding or scratching improves resistance of the stainless steel to Chloride Attack；
In 6.S2 when molten steel reaches 1/4 of molten steel maximum capacity in ladle in ladle, zirconium oxide, high carbon ferro-chrome, vanadium iron is added
Alloy powder, dilval, manganeisen and silicon carbide, and reach 3/ of molten steel maximum capacity in ladle by molten steel in ladle
Added before when 4 it is above-mentioned add materials, and a soft blow argon is first carried out after slag making, between the production and metal that promote zirconium monocrystalline
Compound is uniformly dispersed, and improves the chlorine-resistant corrosivity of stainless steel；
7. a kind of stainless-steel thin-wall pipe, when conveying tap water, inside is not perishable, long service life.
Specific embodiment
A kind of stainless-steel thin-wall pipe, including tube body.Tube body includes the outer tube wall and inner tubal wall positioned at outside.Outer tube wall and interior
Between tube wall with a thickness of wall thickness.The ratio between outer diameter of wall thickness and tube body is not more than 6%, is herein 4%.The outer diameter and wall thickness of tube body
Can according to the actual situation depending on, herein outer tube diameter be 84mm, wall thickness 2mm.
Tube body is obtained by a kind of stainless-steel cold-rolling of resistance to chlorine corrosion.
Embodiment one,
A kind of stainless steel of resistance to chlorine corrosion, is grouped as by the group of following mass fraction,
C:1-1.55wt%, Cr:18-19wt%, Si:1.2-1.75wt%, Zr:2.22-3.05wt%, Mn:1.2-
1.5wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤
0.015wt%, [H]≤0.0002wt%, Y:0.3-0.5wt%, it is silicon carbide and metal that wherein Si adding raw materials, which are source,
Impurity in alloy, Zr adding raw materials are Zirconium dioxide powder, and O content is 1.72-2.40wt% in stainless steel, remaining ingredient is
Fe and other inevitable impurity.
The production method of the stainless steel of above-mentioned resistance to chlorine corrosion:
S1: will be in molten iron and steel scrap converter, the conventional top bottom blowing control blowing oxygen of progress presses 0.80-0.85MPa, when out
For steel temperature at 1635-1642 DEG C, converter terminal carbon is 0.03-0.05wt% when control is tapped, then is tapped 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 oxide, high carbon ferro-chrome, vanadium iron powder, dilval, manganeisen, silicon carbide and yttrium iron alloy, and
Added before when ladle reaches 3/4 of molten steel maximum capacity in ladle by molten steel it is above-mentioned add materials, wherein silicon carbide powder, powder
Last partial size is 0.5 ± 0.05 μm, and zirconium dioxide is that the zirconium dioxide of melting recrystallization crushes to obtain 0.6 ± 0.05 μm；
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 carries out soft blow argon to molten steel after slag making, and the soft blow time is greater than 10min, detects molten steel composition and adds part
Raw material, interval soft blow argon adjust molten steel composition and reach following standard:
C:1-1.55wt%, Cr:18-19wt%, Si:1.2-1.75wt%, Zr:2.22-3.05wt%, Mn:1.2-
1.5wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤d-0.004wt%, P≤
0.015wt%, remaining ingredient are Fe 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: after the stainless steel bar stock of S5 is put into burial pit slow cooling to room temperature, product stainless steel is obtained.
The production of stainless steel bar stock is carried out according to aforementioned production method.The heating of resulting stainless steel bar stock, forging and stamping perforation with
And the processing such as cold rolling, tempering obtain stainless-steel thin-wall pipe, stainless-steel thin-wall pipe it is as follows at being grouped as.
The resulting stainless-steel thin-wall pipe of embodiment 1A-1E stainless steel bar stock corresponding with its is tested, test result
It is as follows.Wherein rate of corrosion test is according to " the corrosion stainless steel ferric trichloride pitting corrosion test of GBT17897-2016 metal and alloy
Method " in record method A tested, test temperature be 22 ± 1 DEG C, test duration be respectively 72h, 144h and 420h.
Comparative example one is set to comparative example four.
Comparative example one,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is to increase molten steel dosage and S2
Original silicon carbide powder is substituted with carbon dust and carries out deoxidation, and the other elements in addition to Si is made to keep close with embodiment 1B.
Comparative example two,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is Si adding raw materials for silicomanganese conjunction
Gold or Antaciron, and add carbon dust in S2 and carry out deoxidation, the Si of final resulting stainless steel is containing close with embodiment 1B.
Comparative example three,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is to increase molten steel dosage substitution two
Zirconium oxide dosage makes the other elements in addition to Zr, O keep close with embodiment 1B.
Comparative example four,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is Zr adding raw materials for ferrozirconium conjunction
Gold, the Zr of final resulting stainless steel is containing close with embodiment 1B.
Comparative example five,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is to be additionally added carbon dust progress in S2
Deoxidation, so that O < 0.0005wt% in finished product content.
Comparative example six,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is to reduce silicon carbide addition in S2
Amount controls C in S3 molten steel and is less than 0.1wt%.
Comparative example one to comparative example four stainless-steel thin-wall pipe it is as follows at being grouped as.
| Comparative example one | Comparative example two | Comparative example three | Comparative example four | Comparative example five | Comparative example six | |
| C/wt% | 0.15 | 0.15 | 0.15 | 0.15 | 0.16 | 0.08 |
| Cr/wt% | 18.65 | 18.66 | 18.66 | 18.66 | 18.65 | 18.66 |
| Si/wt% | 0 | 0.91 | 0.91 | 0.91 | 0.91 | 0.81 |
| Zr/wt% | 2.5 | 2.5 | 0 | 2.5 | 2.5 | 2.5 |
| Mn/wt% | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 |
| Ni/wt% | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 |
| V/wt% | 3 | 3 | 3 | 3 | 3 | 3 |
| N/wt% | 0.06 | 0.06 | 0.06 | 0.06 | 0.07 | 0.06 |
| S/wt% | 0.002 | 0.002 | 0.02 | 0.002 | 0.002 | 0.002 |
| P/wt% | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 |
| Y/wt% | 0.46 | 0.46 | 0.46 | 0.46 | 0.46 | 0.46 |
| [H]/wt% | 0.0001 | 0.0002 | 0.0002 | 0.0002 | 0.0002 | 0.0002 |
| O/wt% | 0.26 | 0.26 | 0.003 | 0.003 | 0.004 | 0.26 |
Comparative example one to the resulting stainless-steel thin-wall pipe of comparative example four stainless steel bar stock corresponding with its is tested, is surveyed
Test result is as follows.
Comparative example one and comparative example one to four are it is found that silicon carbide is reacted with zirconium dioxide and taken off when molten steel is melted
Oxygen, while silicon carbide has both the effect for promoting crystal that refinement is precipitated, vanadium has both the effect for promoting precipitation strength, and the two acts on lower steel
A large amount of small monocrystalline zirconiums are formed in water, monocrystalline zirconium combines other metallic elements and carbon to form intermetallic compound, improves stainless
The chlorine-resistant corrosivity of steel itself；And after stainless steel machine-shaping, stainless steel surface one layer of zirconium oxide film layer of oxidizable formation, resistance
Chloride ion is hindered to contact with iron or other metallic elements, further stainless steel chlorine-resistant corrosivity, so that stainless steel has well
Resistance to chlorine corrosion, under chloride ion-containing environment corrode slowly, long service life.
Comparative example one, comparative example five and embodiment six are it is found that remain partially carbonized silicon and zirconium oxide in stainless steel
When, the chlorine-resistant corrosivity of stainless steel can be further increased.
Embodiment two,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is to be 0.5 with whisker length ±
005 μm of silicon carbide whisker substitution silicon carbide powder addition, each element composition are equal with embodiment one.
Embodiment three,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is that silicon carbide powder partial size is
0.3-1.0 μm, each element composition is equal with embodiment one.
The stainless steel bar stock corresponding with its with the resulting stainless-steel thin-wall pipe of embodiment three of embodiment two is tested, is surveyed
Test result is as follows.
Comparative example one is to embodiment three it is found that the silicon carbide that Si adding raw materials are source is silicon carbide powder, powder
When last partial size is not more than 0.8 μm, chlorine-resistant corrosive nature is preferable.
Example IV,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is to be dissolved in [H] in steel
Content is 0.0003-0.0005wt%, and other elements keep close with embodiment 1B.
| Embodiment 4A | Embodiment 4B | |
| [H]/wt% | 0.0003 | 0.0005 |
Embodiment five,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is to substitute yttrium iron with molten steel dosage
Alloy makes the other elements in addition to Y keep close with embodiment 1B.
Comparative example five,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is to detect molten steel before tapping in S1
Interior phosphorus content, converter terminal carbon is 0.06-0.20wt% when control is tapped.
The stainless-steel thin-wall pipe of example IV, embodiment five and comparative example five it is as follows at being grouped as.
Comparative example one and comparative example five 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, be trapped in molten steel in conjunction with the elements such as P and Cr, V, Mn, improve the stability of the stainless composition of steel of gained, and avoid for except
Remove the S being detained, P element and the trouble refined again.
Example IV and the resulting stainless-steel thin-wall pipe of embodiment five stainless steel bar stock corresponding with its are tested, surveyed
Test result is as follows.
Comparative example one and example IV it is found that in stainless steel when [H]≤0.0002wt%, anti-chlorine corrosivity compared with
It is excellent.
Comparative example one and embodiment five can improve stainless steel and its casting it is found that stainless steel includes Y:0.3-0.5wt%
Resistance of the machinability and raising stainless steel of base to Chloride Attack.
Embodiment six,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is the two of the adding raw materials of Zr
Zirconium oxide be respectively zirconium dioxide hydrate, the resulting zirconium dioxide of slight calcination, the resulting zirconium dioxide of heat-flash calcination, and
Stainless steel it is identical as embodiment 1B at being grouped as.
Embodiment seven,
A kind of stainless steel of resistance to chlorine corrosion, based on the basis of embodiment 1B, difference place is same when molten steel is added in ladle
Zirconium oxide, high carbon ferro-chrome, vanadium iron powder, dilval, manganeisen and silicon carbide is added in step, and in ladle by molten steel
Added when reaching molten steel maximum capacity in ladle it is above-mentioned add materials, it is identical as embodiment 1B at being grouped as.
The stainless steel bar stock corresponding with its with the resulting stainless-steel thin-wall pipe of embodiment seven of embodiment six is tested, is surveyed
Test result is as follows.
Comparative example one and embodiment six are it is found that the zirconium dioxide of the adding raw materials of Zr is preferably melting recrystallization
It is more preferable to promote effect to stainless steel anti-corrosion effects for the zirconium dioxide that zirconium dioxide crushes.
Comparative example one and embodiment seven it is found that in S2 when in ladle molten steel reach 1/ of molten steel maximum capacity in ladle
When 4, zirconium oxide, high carbon ferro-chrome, vanadium iron powder, dilval, manganeisen and silicon carbide is added, and in ladle by steel
When water reaches 3/4 of molten steel maximum capacity in ladle before add it is above-mentioned add materials so that zirconium dioxide and silicon carbide can fill
In the molten steel for dividing mixing to be dispersed in ladle, promotes the production of zirconium monocrystalline and the dispersion of intermetallic compound, improve stainless steel
Chlorine-resistant corrosivity.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (10)
1. a kind of stainless steel of resistance to chlorine corrosion, which is characterized in that the stainless steel melts, by the group of following mass fraction
It is grouped as,
C:0.13-0.16wt%, Cr:18-19wt%, Si:0.8-0.95wt%, Zr:2.22-3.05wt%, Mn:1.2-
1.5wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-0.08wt%, S≤0.004wt%, P≤
0.015wt%, it is impurity in silicon carbide and metal alloy that wherein Si adding raw materials, which are source, and Zr adding raw materials are titanium dioxide
Zirconium powder, O content is 0.23-0.32wt% in the stainless steel, remaining ingredient is Fe and other inevitable impurity.
2. a kind of stainless steel of resistance to chlorine corrosion according to claim 1, which is characterized in that the Si adding raw materials are source
Silicon carbide is silicon carbide powder, and powder diameter is not more than 0.8 μm.
3. a kind of stainless steel of resistance to chlorine corrosion according to claim 1, which is characterized in that the inevitable impurity packet
Include [H] being dissolved in steel, [the H]≤0.0002wt%.
4. a kind of stainless steel of resistance to chlorine corrosion according to claim 1, which is characterized in that the adding raw materials of the Zr
Zirconium dioxide is that the zirconium dioxide of melting recrystallization crushes to obtain.
5. a kind of stainless steel of resistance to chlorine corrosion according to claim 1, which is characterized in that the stainless steel further includes Y:
0.3-0.5wt%.
6. a kind of stainless steel of resistance to chlorine corrosion according to claim 5, which is characterized in that the stainless steel is by following quality
The group of score is grouped as,
C:1.24wt%, Cr:18.66wt%, Si:1.4wt%, Zr:2.5wt%, Mn:1.3wt%, Ni:8.5wt%, V:
3wt%, N:0.06wt%, S:0.002wt%, P:0.015wt%, O:2.0wt%, remaining ingredient is Fe and other are inevitable
Impurity.
7. a kind of stainless steel of resistance to chlorine corrosion according to claim 1, which is characterized in that the production stage of the stainless steel
It is as follows:
S1: will be in molten iron and steel scrap converter, the conventional top bottom blowing control blowing oxygen of progress presses 0.80-0.85MPa, when out
Steel temperature is tapped at 1635-1642 DEG C, then into ladle；
S2: zirconium dioxide, high carbon ferro-chrome, vanadium iron are added into ladle for converter whole Argon in tapping process into ladle
Powder, dilval, manganeisen and silicon carbide；
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 carries out soft blow argon to molten steel after slag making, and the soft blow time is greater than 10min, detects molten steel composition and adds part
Raw material, interval soft blow argon adjust molten steel composition and reach following standard: C:0.13-0.16wt%, Cr:18-19wt%, Si:0.8-
0.95wt%, Zr:2.22-3.05wt%, Mn:1.2-1.5wt%, Ni:8.5-9.5wt%, V:2.5-3.5wt%, N:0.06-
0.08wt%, S≤d-0.004wt%, P≤0.015wt%, remaining ingredient are Fe 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: after the stainless steel bar stock of S5 is put into burial pit slow cooling to room temperature, product stainless steel is obtained.
8. a kind of stainless steel of resistance to chlorine corrosion according to claim 7, which is characterized in that in S2 when in ladle molten steel reach
In ladle molten steel maximum capacity 1/4 when, be added zirconium oxide, high carbon ferro-chrome, vanadium iron powder, dilval, manganeisen
And silicon carbide, and above-mentioned add materials is added before when ladle reaches 3/4 of molten steel maximum capacity in ladle by molten steel.
9. a kind of stainless steel of resistance to chlorine corrosion according to claim 7, which is characterized in that before tapping in S1 in detection molten steel
Phosphorus content, converter terminal carbon is 0.03-0.05wt% when control is tapped.
10. a kind of stainless-steel thin-wall pipe, which is characterized in that the stainless-steel thin-wall pipe is as described in claim 1-9 any one
The stainless-steel cold-rolling of resistance to chlorine corrosion a kind of obtain.
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| US20210069780A1 (en) * | 2019-09-11 | 2021-03-11 | Seiko Epson Corporation | Precipitation hardening stainless steel powder, compound, granulated powder, precipitation hardening stainless steel sintered body, and method for producing precipitation hardening stainless steel sintered body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20210069780A1 (en) * | 2019-09-11 | 2021-03-11 | Seiko Epson Corporation | Precipitation hardening stainless steel powder, compound, granulated powder, precipitation hardening stainless steel sintered body, and method for producing precipitation hardening stainless steel sintered body |
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