CN1807672A - Middle content chromium copper, iron-containing antiseptic anticreas rustless steel sheet belt and its production method - Google Patents
Middle content chromium copper, iron-containing antiseptic anticreas rustless steel sheet belt and its production method Download PDFInfo
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Abstract
The invention discloses a stainless steel plate band and producing method of middle chromic inclusion copper ferrite, which comprises the following parts (in mass fraction): C<=0. 05, N<=0. 05, Si<=1. 0, Mn<=1. 0, P<=0. 05, S<=0. 02, Cr 16-20, Cu 0. 6-2. 5, Ni<=2. 0, Mo<=2. 0, Ti<=0. 50, Nb<=0. 50, 0<=rare-earth element<=0. 1%, 0<=other elements<=0. 1% (others for balance Fe and inescapable foreign matter), wherein the method is characterizes by the following: containing the producing method of smelting, continuous casting, hot-rolling, annealing, acid cleaning and cold reducing; adopting conticaster of electromagnetic mixing (heating-up temperature of hot-rolled is 1000-1100deg. c, the temperature of final rolling is 800-900deg. c); annealing and keeping temperature for 10 hours in reduction condition at 700-900deg. c; cooling quickly to 600deg. c at lower 50deg. c/hr; . cooling air.
Description
Technical field
The present invention relates to a kind of middle chromium copper-bearing ferritic antibacterial stainless steel strip and manufacture method thereof.
Background technology
In chrome ferritic stainless steel be with AISI430 with on 430 bases serve as adapt to rigidity can different demands, further alloying and a series of trades mark of developing are that stainless steel is compared with nickel, its excellent property and cheap.Middle chrome ferritic stainless steel will be applied to the fields high to the stainless steel surface specification of quality such as galley equipment, household electrical appliance, communications and transportation, building interior trim, except that need have the total advantage of chrome stainless steel, higher requirement has been proposed for the crease-resistant folding ability of stainless steel surface in the formability of its cold rolled sheet, the especially moulding process.Wrinkling is a kind of surface imperfection that ferritic stainless steel produces when dependent variable is big in moulding process, and this undesirable defective occurs in the rolling direction that is parallel to plate, shows as narrow convex stripe, and promptly fold is gone up on the surface.CN200410046247, CN01136913, CN00800983 have announced the ferrite stainless steel manufacture method of good formability and excellent machinability respectively, but all do not relate to the problem of cold-rolling stainless steel strip crease resistance in above-mentioned three inventions.CN98801478 has announced anti-deep drawing quality and good ferrite stainless steel and the manufacture method thereof of the shape of anti-wrinkle modification, principal element content in the stainless steel is limited, deep-draw and anti-wrinkle deformability are by the content of constraint V and Nb, mainly the temperature range that defines billet heating temperature and hot roughing on the manufacture method, do not relate to alloy element copper in this patent of invention, cold formability, erosion resistance and the anti-microbial effect etc. of alloy element copper are not all related to.On the other hand along with social development, growth in the living standard, the fungi-proofing sense of self-protection of human health strengthens, and the demand of antimicrobial prod constantly increases.Stainless steel has been widely used in the closely-related every field of living with people because visual appearance is good, cost performance is good.Originally the begin one's study anti-bacteria stainless steel of alloying elements such as cupric, argentiferous of doomsday in last century.Disclose among 6-209121 and the 7-55069 for the special permission of cupric stainless steel Japan, invented the concentration that in stainless surface, increases copper, strengthen anti-microbial effect.Announced among the CN1158363A that a kind of process adds the copper of 0.4～5.0% weight and separates out the stainless steel that copper-rich phase improves germ resistance with the ratio precipitation of 0.2 volume %; Announce a kind of nanometer precipitated phase ferrite antibacterial stainless steel among the CN02144568, mainly studied stainless germ resistance and antibacterial range problem.In the above-mentioned patent stainless steel germ resistance is studied, but do not related to the stainless surface quality of cupric, processability and wrinkle resistance, the above-mentioned patent of foundation can't be produced has excellent anti-bacterium capability surface quality cold rolled sheet attractive in appearance simultaneously.Therefrom chromium is that the requirement of ferritic stainless steel Application Areas is set out, and the anti-microbial property of stainless steel sheet strip is no doubt important, but stainless-steel cold-rolling strip apparent mass and in moulding process necessary good formability and crease resistance even more important.Therefore be necessary to research and develop antibiotic crease-resistant middle chromium copper-bearing ferritic cold rolled sheet and manufacture method thereof.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing middle chromium copper-bearing ferritic antibacterial stainless steel cold rolled sheet, the invention provides a kind of middle chromium copper-bearing ferritic stainless-steel cold-rolling strip that has excellent anti-bacterium capability and good wrinkle resistance is arranged in moulding process, the invention provides a kind of manufacture method of above-mentioned stainless-steel cold-rolling strip simultaneously.
The composition characteristics of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet is (weight %) in provided by the invention:
C≤0.05 N≤0.05 Si≤1.0 Mn≤1.0 P≤0.05
S≤0.02 Cr?16～20 Cu?0.6～2.5 Ni≤2.0 Mo≤2.0
Ti≤0.50 Nb≤0.50 0≤rare earth element≤0.1% 0≤other element≤0.1%
All the other are balance-element Fe and unavoidable impurities element
Rare earth element (cerium, lanthanum, neodymium), other element such as elements such as trace B and zirconium are to add according to the requirement of use properties, wherein the addition of any rare earth element (cerium, lanthanum, neodymium) or other element (boron, zirconium) all≤0.1%, and satisfy C+N≤0.08%, and Cu (%) 〉=Ni (%) 〉=0.5 * Cu (%).
Chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet is through after hot rolling and cold rolling repeatedly annealing, the pickling in this, disperse rich copper precipitated phase and its total area occupation ratio 〉=2% of particle diameter between 0.1～0.5 μ m that distributing in stainless steel base.
Cold-rolling stainless steel strip provided by the invention has surface quality attractive in appearance, and the surface working grade has reached 2B standard (GB3280-92).Except that having stainless corrosion-resistant, resistance to rust and favorable mechanical performance, further have good cold formability and surperficial crease resistance in the course of processing.
Below mechanism of the present invention is carried out brief description.
Chromium is the principal element that ferritic stainless steel has ferritic structure and has good corrosion resistance, and the useful effect of chromium is to form form compact and stable Cr
2O
3Oxide film.With the increase of chromium amount, the performance of anti-spot corrosion, slit and corrosion resistant all improves in the ferritic stainless steel.The too high levels of chromium (as＞20%) then quicken a ' phase and б mutually formation and precipitation and make the ferrite crystal grain of steel thick, increase stainless embrittlement tendency.A ' phase can the stainless solidity to corrosion of influence with б formation and precipitation mutually.Increase with chromium content, stainless brittle transition temperature also will on move.Chromium content is low excessively, can not guarantee stainless anti-corrosion performance such as antirust, so chromium component (weight) is 16～20%Cr among the present invention.
Copper acts on extremely important in middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet.Copper can play effect antibiotic, anti-corrosion and that improve cold forming capability.By suitable thermal treatment oversaturated copper is distributed in stainless matrix and the surface with the form disperse of second phase, separates out when adding up to area occupation ratio greater than certain proportion when copper-rich phase reaches certain size and copper-rich phase, its antibacterial effect obviously strengthens.The present inventor through research draw rich copper precipitated phase size at 0.1～0.5 mu m range, separate out total area occupation ratio＞2% o'clock, middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet has good antibacterial effect.Copper is weak austenite former, the cracking that the copper amount is too high when easily causing hot rolling, but copper content has been crossed low guaranteed not antibacterial effect, therefore in this in chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet copper component (weight) be 0.6～2.0%Cu.
Carbon, nitrogen are strengthening element, because carbon, the solubleness of nitrogen in ferritic stainless steel are low, have carbon in the subsequent cooling process after heat, nitride is separated out, cause the reduction of ferritic stainless steel toughness, brittle transition temperature increases and the intergranular corrosion susceptibility of ferritic stainless steel is strengthened, therefore (weight) carbon component≤0.05%C, nitrogen component≤0.05%N and control C+N≤0.08% in the chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in this.
The vital role of molybdenum mainly is to improve the anti-spot corrosion and the slit and corrosion resistant performance of ferritic stainless steel, promotes the passivation of ferrochrome exothermic, improves Corrosion Resistance of Stainless Steels.But the molybdenum too high levels improves the Sensitivity of Stress Corrosion of the cold rolling attitude of ferritic stainless steel, and therefore molybdenum composition (weight) Mo≤2.0% in the chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in this can be selected in right amount according to service requirements.
Nickel can improve room-temperature mechanical property, intensity and the toughness of ferritic stainless steel, and the brittle transition temperature of steel is moved down, also can further improve the corrosion resistance nature of steel in some medium, centering chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet cold forming capability and wrinkle resistance improve highly beneficial.But nickel is austenite former, for chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in guaranteeing has single relatively ferritic structure, avoid the crystal grain component segregation to cause the stainless steel wrinkle resistance to descend, nickel composition Ni≤2.0% in the chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in this, and meet following formula: Cu (%) 〉=Ni (%) 〉=0.5 * Cu (%).
Titanium and niobium are ferrite former, an amount of titanium and niobium can make carbon, the nitride of chromium in the stainless steel transfer the crystal grain of carbon, nitride and the refinement ferritic stainless steel of formation titanium, niobium, improve the intergranular corrosion resistance performance of ferritic stainless steel, carbon, nitride also can impel rich copper precipitated phase even dispersion to separate out simultaneously.Take all factors into consideration the influence of titanium, niobium alloy element, choose in the chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in this: Ti≤0.50%, Nb≤0.5%.
Manganese, silicon etc. are indispensable alloying elements in the stainless steel, can be used as deoxidant element,, improve the surface quality of cold rolled sheet in order to improve the purity of molten stainless steel, choose Si≤1.0%, Mn≤1.0% in the chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in this.
In this in chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet, also can add rare earth element (cerium, lanthanum, neodymium) or other element boron, zirconium etc. according to the requirement of use properties, but wherein the addition of any element all≤0.1%, all the other are balance-element iron and unavoidable impurities element.
Chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet manufacture method relates to smelting, continuous casting, hot rolling, annealing, pickling and master operation such as cold rolling successively in of the present invention.Behind the molten steel process vacuum-oxygen decarbonizing stove (VOD) and ladle refining furnace (LF) refining of converter smelting, the composition of molten steel (weight %) reaches following requirement and can tap.
C≤0.05 N≤0.05 Si≤1.0 Mn≤1.0 P≤0.05
S≤0.02 Cr?16～20 Cu?0.6～2.5 Ni≤2.0 Mo≤2.0
Ti≤0.50 Nb≤0.50 0≤rare earth element≤0.1% 0≤other element≤0.1%
All the other are balance-element Fe and unavoidable impurities element;
Wherein the addition of any rare earth element or other element all≤0.1% and satisfies C+N≤0.08%, and Cu (%) 〉=Ni (%) 〉=0.5 * Cu (%).
It is characterized in that:
Continuous casting must adopt the continuous caster of charged magnetic stirring, makes ratio 〉=30% of equiax crystal in the continuously cast bloom solidified structure.
Continuous casting steel billet hot rolling Heating temperature is at 1000～1100 ℃ during hot rolling, and finishing temperature is 800～900 ℃.
Stainless steel hot-rolling coil 700～900 ℃ of scopes insulation more than 10 hours in reducing atmosphere during cover annealing, be as cold as 600 ℃ with the following speed of cooling stove of 50 ℃/hr after air cooling.
Stainless steel hot-rolling twists in after the cover annealing to obtaining to adopt once cold rolling or secondary cold-rolling method between the cold rolling finished product, and once cold rolling draft 〉=80% is 60～50%: 40～50% with secondary cold-rolling draft partition ratio once in the secondary cold-rolling method.
In the pickling and anneal after cold rolling, heat-treatment temperature range is 800～900 ℃, and the treatment time is 2t～30t min., the thickness of cold rolled sheet when t (unit is mm) is annealing.
Chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet is after final pickling and annealing in this, the rich copper precipitated phase that disperse distributes in the matrix of stainless steel sheet strip is separated out total area occupation ratio 〉=2%, the atomic percent of copper has good anti-microbial property than 〉=0.1% in the surface passivated membrane.
Chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet has good wrinkle resistance in this in follow-up cold-forming process, has surface quality attractive in appearance.
Manufacture method to chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in the basis describes below.
Cupric contains stainless steel molten iron and alloy process converter or the electric arc furnace smelting and the further external refining (Vaccum Oxygen Decarburization or Argon Oxygen Decarburization) of chromium, reaches carbon drop guarantor chromium effect preferably.Reach the various chemical ingredientss of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in this and relevant composition constraint condition thereof through external refining.
The surface quality and the proportion of equiaxed grain in wrinkle resistance and the casting blank solidification tissue of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet are closely related in this.The proportion of equiaxed grain height, the crease resistance of cold rolled sheet improves, and surface quality is good.For obtaining the continuously cast bloom of high proportion of equiaxed grain, the continuous caster that must adopt charged magnetic to stir during the molten steel cast, promote that the orderly of molten steel flowed in the process of setting, the component segregation that column crystal causes when reducing continuously cast bloom and solidifying reduces the inhomogeneous and fold phenomenon that causes of material deformation performance that the postorder course of processing causes by segregation.
Should avoid temperature too high during continuous casting steel billet hot rolling heating, prevent that ferritic stainless steel grain growth tendency from increasing, plasticity is reduced and be prone to crackle, slab heating temperature is controlled at 1000～1100 ℃, finishing temperature and is controlled at 800～900 ℃, can effectively reduce stainless wrinkling.
Hot rolled coil the annealing process of bell furnace to basis in the raising antibiotic, wrinkle resistance of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet most important.Annealing can reduce rolling stress, finish recrystallize, improves the ratio of equiax crystal in the hot-rolled sheet, thereby improves the surface quality of cold rolled sheet, improves cold forming capability and wrinkle resistance; Can finish in the stainless steel base supersaturation copper in the annealing process separates out with the form of second phase, guarantee that the copper-rich phase even dispersion of median size between 0.1～0.5 μ m is distributed in the stainless steel base, the condition of necessity is provided for the anti-microbial property of middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet.So the annealed temperature is between 700～900 ℃ in the bell-type Deoxidation Atmosphere in Furnace for hot-rolled coil, soaking time is more than 10 hours, be as cold as 600 ℃ with the following speed of cooling stove of 50 ℃/hr after air cooling.
In this content chromium copper, iron-containing antiseptic anticreas rustless steel sheet belt will annealing before cold rolling, pickling and reconditioning, also smooth after cold rolling, aligning, shearing etc.For eliminating the hot rolled iron scale, hot rolled strip is wanted shot peening and pickling; For eliminating the defective that causes after defective that blank brings and cold rolling, the thermal treatment, the band steel also needs to carry out reconditioning.In order to guarantee the surface luster of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in this, also want pickling behind the finished products, stainless steel surface is carried out Passivation Treatment, give the cold-rolling stainless steel strip good solidity to corrosion.The cold rolled sheet final annealing carries out in 800～900 ℃ reducing atmosphere, and annealing time is 2t～30t min., the thickness (unit is mm) of cold rolled sheet when t represents annealing eventually.The rich copper precipitated phase that disperse distributes in the matrix of stainless-steel cold-rolling strip can significantly not reduce, and it is separated out and adds up to area occupation ratio to answer 〉=2%, and the atomic percent of copper has surface quality attractive in appearance and good anti-microbial property than 〉=0.1% in the surface passivated membrane.
Chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet is the requirement that adapts to its Application Areas in this, and is strict to the surface quality of cold rolled sheet, requires cold rolled sheet to have the surface of good wrinkle resistance.The fold phenomenon that ferritic stainless steel cold rolled sheet surface produces is a kind of serious surface imperfection, fold is a kind of narrow projection striped that parallels with rolling direction substantially that preferable grain orientation in the ferritic stainless steel (texture) forms on the surface through degree of depth cold working, and it is subjected to the material impact of cold rolled sheet texture.The present invention adopts the chemical ingredients of control steel, refinement casting solidification tissue, increase proportion of equiaxed grain, select the cold rolling draft partition ratio of suitable heating, rolling temperature, different rolling processes when rolling, and in conjunction with suitable thermal treatment process, can eliminate and alleviate fold, improve the wrinkle resistance of stainless-steel cold-rolling strip of the present invention.
Added alloy element copper when anti-microbial effect of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet is smelting in this, and through suitable thermal treatment disperse in stainless steel base distributed certain size and a certain proportion of rich copper precipitated phase, antibacterial metal positively charged ion that has positive charge that stainless steel surface decomposites and electronegative bacteria cell wall and cytolemma attract each other, make the disorderly imbalance of existence microenvironment of bacterium, suppress its breathing and cause bacterium that death takes place, thereby reach antibiotic and the bacteriostatic effect.By key links such as smelting, cast, rolling and thermal treatments, stainless metallographic structure of middle chromium copper-bearing ferritic and texture that control is invented make the stainless-steel cold-rolling strip apparent mass of being invented good, and cold rolled sheet reaches the above level of slick 2B steel plate; To intestinal bacteria, streptococcus aureus, Candida albicans and pyocyanic antibiotic rate all greater than 99%.
The crease-resistant cold-rolling stainless steel strip of chromium copper-bearing ferritic antibacterial both can satisfy the strict demand of industry fields such as galley equipment, household electrical appliance, building interior trim to the stainless steel surface quality in of the present invention, and simultaneously the product that easily by infectation of bacteria, easily becomes the cross infection source by the daily life of this stainless steel sheet strip manufacturing and communal facility etc. has the automatic cleaning action of bactericidal.
Description of drawings
Fig. 1 is the transmission electron microscope photo of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment one in this.
Fig. 2 is the fold shape figure when chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment one stretches with contrast steel 430 test blocks in this.
Embodiment
Describe the embodiment of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in this and manufacture method thereof in detail below in conjunction with embodiment, but embodiment of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet and manufacture method thereof is not limited to following embodiment in this.
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment one
The composition of present embodiment is (weight %):
C 0.03 N 0.04 Si?0.60 Mn 0.80 P 0.04
S ≤0.02 Cr?17.0 Cu?1.30 Ni 1.20 Mo?1.40
Ti?0.40 Nb?0.30
All the other are balance-element Fe and unavoidable impurities element.
Through the cold rolling of hot rolling, a rolling process and repeatedly in the cold-rolling stainless steel strip after annealing, the pickling, in the stainless steel base disperse distributing particle diameter between 0.1～0.5 μ m rich copper precipitated phase and its to add up to area occupation ratio be 3.0%, the surface working grade of cold-rolling stainless steel strip has reached 2B standard (GB3280-92).
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment two
The composition characteristics of present embodiment is (weight %):
C 0.03 N 0.03 Si?0.60 Mn 0.80 P 0.04
S ≤0.02 Cr?18.0 Cu?1.50 Ni 1.40 Mo?1.40
Ti?0.40 Nb?0.30 B 0.06
All the other are balance-element Fe and unavoidable impurities element.
Through the cold rolling of hot rolling, a rolling process and repeatedly in the cold-rolling stainless steel strip after annealing, the pickling, in the stainless steel base disperse distributing particle diameter between 0.1～0.5 μ m rich copper precipitated phase and its to add up to area occupation ratio be 3.4%, the surface working grade of cold-rolling stainless steel strip has reached 2B standard (GB3280-92).
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment three
The composition characteristics of present embodiment is (weight %):
C 0.02 N 0.04 Si?0.60 Mn?0.80 P 0.04
S ≤0.02 Cr?16.0 Cu?1.60 Mo?1.40 Ti?0.40
Nb?0.30 Zr?0.06
All the other are balance-element Fe and unavoidable impurities element.
Through the cold rolling of hot rolling, two rolling processes and repeatedly in the cold-rolling stainless steel strip after annealing, the pickling, in the stainless steel base disperse distributing particle diameter between 0.1～0.5 μ m rich copper precipitated phase and its to add up to area occupation ratio be 3.5%, the surface working grade of cold-rolling stainless steel strip has reached 2B standard (GB3280-92).
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment four
The composition characteristics of present embodiment is (weight %):
C 0.015 N 0.04 Si?0.60 Mn?0.80 P 0.04
S ≤0.02 Cr?19.0 Cu?1.60 Ni?1.00 Mo?1.40
Ti?0.40 Nb?0.30 Zr?0.06 Nd?0.06
All the other are balance-element Fe and unavoidable impurities element.
Through the cold rolling of hot rolling, two rolling processes and repeatedly in the cold-rolling stainless steel strip after annealing, the pickling, in the stainless steel base disperse distributing particle diameter between 0.1～0.5 μ m rich copper precipitated phase and its to add up to area occupation ratio be 3.3%, the surface working grade of cold-rolling stainless steel strip has reached 2B standard (GB3280-92).
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment five
The composition characteristics of present embodiment is (weight %):
C 0.015 N 0.02 Si 0.60 Mn?0.80 P 0.04
S ≤0.02 Cr?16.5 Cu 1.50 Mo?1.40 Ti?0.40
Nb?0.30 Ce?0.06
All the other are balance-element Fe and unavoidable impurities element.
Through the cold rolling of hot rolling, a rolling process and repeatedly in the cold-rolling stainless steel strip after annealing, the pickling, in the rust steel matrix disperse distributing particle diameter between 0.1～0.5 μ m rich copper precipitated phase and its to add up to area occupation ratio be 3.0%, the surface working grade of cold-rolling stainless steel strip has reached 2B standard (GB3280-92)
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet manufacture method embodiment one
Present method embodiment manufacturing be the product of middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment one, its main manufacturing step is as follows successively:
One smelts
Behind the molten steel process vacuum-oxygen decarbonizing stove (VOD) and ladle refining furnace (LF) refining of converter smelting, the composition of molten steel (weight %) reaches following requirement and can tap.
C 0.03 N 0.04 Si 0.60 Mn?0.80 P 0.04
S ≤0.02 Cr?17.0 Cu 1.40 Ni?1.20 Mo?1.40
Ti?0.40 Nb?0.30
All the other are balance-element Fe and unavoidable impurities element.
Two continuous castings
Molten steel after refining is become slab through the continuous caster continuous casting that charged magnetic stirs.Casting speed is 0.8m/min during continuous casting, and the proportion of equiaxed grain of casting blank solidification tissue is 35%.
Three hot rollings
Continuous casting steel billet is heated to 1050 ℃, rolls into the hot-rolled coil that thickness is 3.0mm, finishing temperature is 820 ℃.
Four annealing
Stainless steel hot-rolling coil is placed in the bell furnace, 800～850 ℃ of scopes insulation more than 10 hours in reducing atmosphere, be as cold as 600 ℃ with the following speed of cooling stove of 50 ℃/hr after air cooling.
Five is cold rolling
To carry out the cold rolling of a rolling process through the hot-rolled coil of shot peening and pickling, cold rolling draft is 80%, the cold rolled sheet of cold rolling one-tenth 0.60mm.
Six annealing and pickling
In order to obtain good homogeneous surface glossy cold rolled sheet, the roll bending after cold rolling will be annealed and pickling; The annealed temperature is 850 ℃, and annealing time is 2min.
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet manufacture method embodiment two
Present method embodiment manufacturing be the product of middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment two, its main manufacturing step is as follows successively:
Behind the molten steel process vacuum-oxygen decarbonizing stove (VOD) and ladle refining furnace (LF) refining of converter smelting, the composition of molten steel (weight %) reaches following requirement and can tap.
C 0.03 N 0.03 Si 0.60 Mn 0.80 P 0.04
S ≤0.02 Cr?18.0 Cu 1.50 Ni 1.40 Mo?1.40
Ti?0.40 Nb?0.30 B 0.06
All the other are balance-element Fe and unavoidable impurities element.
Continuous casting, hot rolling, annealing, cold rolling, annealing is identical with manufacture method embodiment one with pickling, produces the cold rolled sheet of 0.60mm.
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet manufacture method embodiment three
Present method embodiment manufacturing be the product of middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment three, its main manufacturing step is as follows successively:
Behind the molten steel process vacuum-oxygen decarbonizing stove (VOD) and ladle refining furnace (LF) refining of converter smelting, the composition of molten steel (weight %) reaches following requirement and can tap.
C 0.02 N 0.04 Si?0.60 Mn?0.80 P 0.04
S ≤0.02 Cr?16.0 Cu?1.60 Mo?1.40 Ti?0.40
Nb?0.30 Zr?0.06
All the other are balance-element Fe and unavoidable impurities element.
Continuous casting, hot rolling, process annealing, pickling are identical with manufacture method embodiment one, two rolling processes of cold rolling employing, and cold rolling draft partition ratio is 50%: 50%, and final production goes out the cold rolled sheet of 0.50mm, and the final annealing time is 1.8min.
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet manufacture method embodiment four
Present method embodiment manufacturing be the product of middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment four, its main manufacturing step is as follows successively:
Behind the molten steel process vacuum-oxygen decarbonizing stove (VOD) and ladle refining furnace (LF) refining of converter smelting, the composition of molten steel (weight %) reaches following requirement and can tap.
The composition characteristics of present embodiment is (weight %):
C 0.015 N 0.04 Si 0.60 Mn 0.80 P 0.04
S ≤0.02 Cr 19.0 Cu 1.60 Ni 1.00 Mo?1.40
Ti?0.40 Nb 0.30 Zr 0.06 Nd 0.06
All the other are balance-element Fe and unavoidable impurities element.
Continuous casting, hot rolling, annealing, pickling are identical with manufacture method embodiment one, two rolling processes of cold rolling employing, and cold rolling draft partition ratio is 60%: 40%, final production goes out the cold rolled sheet of 0.60mm.
Middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet manufacture method embodiment five
Present method embodiment manufacturing be the product of middle chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet embodiment five, its main manufacturing step is as follows successively:
Behind the molten steel process vacuum-oxygen decarbonizing stove (VOD) and ladle refining furnace (LF) refining of converter smelting, the composition of molten steel (weight %) reaches following requirement and can tap.
C 0.015 N 0.02 Si 0.60 Mn 0.80 P 0.04
S ≤0.02 Cr 16.5 Cu 1.50 Mo 1.40 Ti 0.40
Nb 0.30 Ce 0.06
All the other are balance-element Fe and unavoidable impurities element.
Continuous casting, hot rolling, annealing, cold rolling, annealing is identical with manufacture method embodiment one with pickling, produces the cold rolled sheet of 0.60mm.
Five embodiment of above-mentioned manufacture method will annealing before middle content chromium copper, iron-containing antiseptic anticreas rustless steel sheet belt is cold rolling, pickling and reconditioning, smooth after cold rolling, aligning, shearing etc.For eliminating the hot rolled iron scale, hot rolled strip is wanted shot peening and pickling; For eliminating the defective that causes after defective that blank brings and cold rolling, the thermal treatment, the band steel also needs to carry out reconditioning.For the surface luster of chromium copper-bearing ferritic antibacterial wrinkle-resistant stainless steel cold rolled sheet in guaranteeing, also want pickling behind the finished products, stainless steel surface is carried out Passivation Treatment, give the cold-rolling stainless steel strip good solidity to corrosion.
Claims (3)
1, a kind of middle content chromium copper, iron-containing antiseptic anticreas rustless steel sheet belt, its composition characteristics is (weight %):
C≤0.05 N≤0.05 Si≤1.0 Mn≤1.0 P≤0.05
S≤0.02 Cr?16～20 Cu?0.6～2.5 Ni≤2.0 Mo≤2.0
Ti≤0.50 Nb≤0.50 0≤rare earth element≤0.1% 0≤other element≤0.1%
All the other are balance-element Fe and unavoidable impurities element;
Rare earth element (cerium, lanthanum, neodymium), other trace element (elements such as boron and zirconium) are to add according to the requirement of use properties, wherein the addition of any rare earth element or other element all≤0.1%, and satisfy C+N≤0.08%, and Cu (%) 〉=Ni (%) 〉=0.5 * Cu (%).
2, middle chromium copper-bearing ferritic antibacterial stainless steel strip according to claim 1, it is characterized in that: through hot rolling with cold rolling repeatedly annealing, after the pickling, disperse rich copper precipitated phase and its total area occupation ratio 〉=2% of particle diameter between 0.1～0.5 μ m that distributing in stainless steel base.
3, content chromium copper, iron-containing antiseptic anticreas rustless steel sheet belt manufacture method in a kind of, it comprises smelting, continuous casting, hot rolling, annealing, pickling and cold rolling master operation, being characterized as of each master operation:
Behind the molten steel process vacuum-oxygen decarbonizing stove (VOD) and ladle refining furnace (LF) refining of converter smelting, the composition of molten steel (weight %) reaches following requirement can tap,
C≤0.05 N≤0.05 Si≤1.0 Mn≤1.0 P≤0.05
S≤0.02 Cr?16～20 Cu?0.6～2.5 Ni≤2.0 Mo≤2.0
Ti≤0.50 Nb≤0.50 0≤rare earth element≤0.1% 0≤other element≤0.1%
All the other are balance-element Fe and unavoidable impurities element,
Wherein the addition of any rare earth element or other element all≤0.1% and satisfies C+N≤0.08%, and Cu (%) 〉=Ni (%) 〉=0.5 * Cu (%);
Continuous casting must adopt the continuous caster of charged magnetic stirring, makes ratio 〉=30% of equiax crystal in the continuously cast bloom solidified structure; Continuous casting steel billet hot rolling heating and temperature control is at 1000～1100 ℃, and finishing temperature is 800～900 ℃; Stainless steel hot-rolling coil 700～900 ℃ of scopes insulation more than 10 hours in reducing atmosphere during cover annealing, be as cold as 600 ℃ with the following speed of cooling stove of 50 ℃/hr after air cooling;
Stainless steel hot-rolling twists in after the cover annealing to obtaining to adopt once cold rolling or secondary cold-rolling method between the cold rolling finished product, and once cold rolling draft 〉=80% is 60～50%: 40～50% with secondary cold-rolling draft partition ratio once in the secondary cold-rolling method;
In the pickling and anneal after cold rolling, heat-treatment temperature range is 800～900 ℃, and the treatment time is 2t～30t min., the thickness of cold rolled sheet when t (unit is mm) is annealing;
Middle content chromium copper, iron-containing antiseptic anticreas rustless steel sheet belt is after final pickling and annealing, and the rich copper precipitated phase that disperse distributes in the matrix of stainless steel sheet strip is separated out total area occupation ratio 〉=2%, the atomic percent of copper ratio 〉=0.1% in the surface passivated membrane.
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