NO176578B - Method of treating roll steel to increase corrosion resistance - Google Patents
Method of treating roll steel to increase corrosion resistance Download PDFInfo
- Publication number
- NO176578B NO176578B NO883781A NO883781A NO176578B NO 176578 B NO176578 B NO 176578B NO 883781 A NO883781 A NO 883781A NO 883781 A NO883781 A NO 883781A NO 176578 B NO176578 B NO 176578B
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- Prior art keywords
- steel
- coating
- rolling
- rolled steel
- water
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005260 corrosion Methods 0.000 title claims abstract description 8
- 230000007797 corrosion Effects 0.000 title claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 34
- 239000011248 coating agent Substances 0.000 claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 10
- 239000011701 zinc Substances 0.000 claims abstract description 10
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 9
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 12
- 229910001563 bainite Inorganic materials 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000047 product Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 244000144619 Abrus precatorius Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000009938 salting Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- FZUJWWOKDIGOKH-UHFFFAOYSA-N sulfuric acid hydrochloride Chemical compound Cl.OS(O)(=O)=O FZUJWWOKDIGOKH-UHFFFAOYSA-N 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000005494 tarnishing Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/383—Cladded or coated products
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating With Molten Metal (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Prevention Of Electric Corrosion (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Electric Cable Arrangement Between Relatively Moving Parts (AREA)
- Laminated Bodies (AREA)
- Electroplating Methods And Accessories (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Chemical Treatment Of Metals (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
For påføring av et belegg av et ikke-Jernmetall, for eksempel sink, på overflaten av valsestål for å forhøye korrosjonsbestandigheten gjennomfører man en fremgangsmåte der valsestålet 1 kontinuerlig fortsettelse av valslngen og ved valsevarmen under anvendelse av trykkvann får fjernet glødeskallet og umiddelbart etter dette bringes til en temperatur som forhindrer nydannelse av glødeskall hvoretter belegget påføres.Derved oppnår man fjerning av tilstedeværende gløde-skall og forhindring av nydannelse av slikt og samtidig en avkjøling, alt ved hjelp av et eneste medium,. nemellg vann, hvorved avkjølingen kan styres slik at valsevarmen på optimal måte kan utnyttes for belegg-ning.Ved hjelp av dette oppnår man at alle fremgangsmåtetrinn kan skje kontinuerlig etter valslngen, altså ved valsehastlgheten, slik at ferdigbelagt sluttprodukt forlater produksjonsbanen analogt med vanlig, ikke etterbehandlet valseprodukt.To apply a coating of a non-ferrous metal, for example zinc, to the surface of roll steel to increase the corrosion resistance, a method is carried out in which the roll steel 1 is continuously continued in the roll and during the roll heat using pressurized water the scale is removed and immediately thereafter a temperature which prevents new formation of ember shells, after which the coating is applied. water, whereby the cooling can be controlled so that the roll heat can be optimally utilized for coating. By means of this it is achieved that all process steps can take place continuously after rolling, ie at the rolling speed, so that finished finished product leaves the production path analogously, not finished rolled product.
Description
Foreliggende oppfinnelse angår en fremgangsmåte for behandling av valsestål og spesielt betongstål, spennstål eller lignende for å forhøye korrosjonsbestandigheten ved å påføre et overtrekk av et ikke jernmetall og fortrinnsvis sink, hvorved valsestålet direkte etter valsevarmen først avskalles og så påføres belegget for å forhindre nydannelse av et slagbelegg på det varme valsestål. The present invention relates to a method for treating rolled steel and in particular concrete steel, prestressing steel or the like in order to increase the corrosion resistance by applying a coating of a non-ferrous metal and preferably zinc, whereby the rolled steel is first peeled off directly after the rolling heat and then the coating is applied to prevent new formation of a impact coating on the hot rolled steel.
Valsestålprodukter anvendes fremfor alt i bygningsindustrien som byggstål og fremfor alt som betongstål, som forspenningsstål for forspent betong samt for avspenning av jord- og fjellankere og lignende. Rolled steel products are used above all in the construction industry as construction steel and above all as concrete steel, as prestressing steel for prestressed concrete and for the relaxation of earth and rock anchors and the like.
Ved anvendelse som sikring for bygningsdeler av betong, dette være seg avspent sikring av stålbetong eller som forspenning eller også som trekkledd for et jord- eller fjellanker, vil det foreligge en komposittilstand mellom stålet og betongen i de aller fleste tilfeller. Dette oppstår ved stålbetong og ved armert betong med øyeblikkelig kompositering uten videre ved at sikrings- og spennelementene innleires i betongen og omhylles av denne, ved forspent betong ved etterfølgende kompositering ved at man for å opprettholde lengdebevegelig-heten av spennleddene, fyller de nødvendige kanaler med sementmørtel på etterhånd. When used as securing for building parts made of concrete, whether this is relaxed securing of reinforced concrete or as prestressing or also as a tensile link for an earth or rock anchor, there will be a composite state between the steel and the concrete in the vast majority of cases. This occurs with steel concrete and with reinforced concrete with immediate compounding without further ado by embedding the securing and tensioning elements in the concrete and being enveloped by it, with prestressed concrete with subsequent compounding by filling the necessary channels with cement mortar afterwards.
Ved fremstilling av denne betong oppstår det ved oppløsning av den i sementen inneholdt kalk en alkalisk oppløsning med en pH-verdi på over 12. Dette har som følge at det på overflaten av de angjeldende elementer danner seg et dekksjikt av jernoksid som passiverer ståloverflaten og beskytter denne for overflatekorrosjon. Av statiske men også konstruktive grunner foreligger spennelementene i kantområdene av bygningsdelene der de oppviser en viss minste avstand til den ytre overflate, den såkalte betongoverdekning. På grunn av luftforurensing, ved brobygg fremfor alt på grunn av den tiltakende anvendelse av veisalting, har i disse medier oppløste klorider ved utilstrekkelig og sågar også ved tilstrekkelig betongoverdekning muligheten til å trenge frem til stålet der passiveringssjiktet ødelegges og stålet direkte kan angripes. Det samme gjelder for strekkleddene i jord- og fjellankere der den korrosive påvirkning på stålet av jordfuktighet, vann og sure jordbestanddeler finnes. Av denne grunn foreligger det et behov for ytterligere korro-sjonsforholdsregler for slike valsestålprodukter i det vanlige bygningsvesen. In the production of this concrete, an alkaline solution with a pH value of over 12 is produced by dissolving the lime contained in the cement. This results in a covering layer of iron oxide forming on the surface of the relevant elements, which passivates the steel surface and protects this for surface corrosion. For static but also constructive reasons, the tension elements are present in the edge areas of the building parts where they show a certain minimum distance to the outer surface, the so-called concrete cover. Due to air pollution, in the case of bridge construction above all due to the increasing use of road salting, chlorides dissolved in these media have the opportunity to penetrate to the steel where the passivation layer is destroyed and the steel can be directly attacked if there is insufficient and even if there is sufficient concrete cover. The same applies to the tension joints in soil and rock anchors where the corrosive effect on the steel of soil moisture, water and acidic soil components is found. For this reason, there is a need for additional corrosion precautions for such rolled steel products in the normal construction industry.
Rent generelt er det kjent at metaller og spesielt jern-metaller utstyres med et tynt sinksjikt som rustbeskyttelse. For dette formål kjenner man forskjellige fremgangsmåter. For flamme- eller varmeforsinkning blir de deler som skal beskyttes dyppet i et bad av smeltet sink som eventuelt kan være legert med aluminium. For elektrolytisk eller galvanisk forsinkning benytter man sure sulfat-, sulfatklorid- eller cyankalietsebad. Det er også kjent å påføre metallovertrekk ved påsprøyting av metallet i flytende form hvorved metallet tilmåtes en sprøytepistol i tråd- eller pulverform, smeltes ved hjelp av en oksygen- brenngassblanding og forstøves ved hjelp av trykkluft. Alle disse fremgangsmåter er .kompliserte og, særlig for fremstilling av betong- eller armeringsstål kun anvendelig etter en høy arbeids- og omkostningsinnsats ved kontinuerlig arbeid for fremstilling av masseprodukter i stor lengde. Til dette kommer at de produkter som skal overtrekkes før påføring av overtrekket må renses, når det gjelder valsestålprodukter må disse allerede fra begynnelsen befries for det vedheftende glødeskallbelegg, noe som vanligvis skjer ved sandblåsing, beising eller lignende behandlingsmetoder. Generally speaking, it is known that metals and especially ferrous metals are equipped with a thin layer of zinc as rust protection. Various methods are known for this purpose. For flame or hot dip galvanizing, the parts to be protected are dipped in a bath of molten zinc which may possibly be alloyed with aluminium. For electrolytic or galvanic zinc plating, acid sulphate, sulphate chloride or cyanide baths are used. It is also known to apply metal coatings by spraying the metal in liquid form, whereby the metal is fed to a spray gun in wire or powder form, melted with the help of an oxygen fuel gas mixture and atomized with the help of compressed air. All these methods are complicated and, especially for the production of concrete or reinforcing steel, only applicable after a high labor and cost effort in the case of continuous work for the production of mass products in large lengths. In addition, the products that are to be coated before applying the coating must be cleaned, in the case of rolled steel products, these must be freed from the adherent scale coating from the beginning, which usually happens by sandblasting, pickling or similar treatment methods.
Ved kontinuerlige fremgangsmåter fremstilt valsestålprodukter er det også allerede kjent å utstyre valsegodset umiddelbart etter valsingen og etter avskalling og for å forhindre nydannelse av skallbelegget og under utnyttelse av valsevarmen, å utstyre stålet med et korrosjonsbestandig belegg, for eksempel av sink, se US-PS 2 442 485. Glødeskall-fjerningen skjer derved i den siste gjennomgang som følge av en sterk og med en strekking forbundet reduksjon av tverr-snittet av valsegodset hvorved det sprøe belegg brekkes opp slik at valsegodset forlater apparaturen i det vesentlige uten belegg. For å oppnå denne tilstand blir godset etter utgang ført gjennom et kammer med en temperatur på 980 til 760°C og fyllt med en deoksiderende gass, fortrinnsvis karbonmonoksid, der denne forbindelse forbrennes til karbondioksid. Umiddelbart deretter løper valsegodset gjennom et ytterligere kammer der det for eksempel belegges med sink i form av sinkpulver som på grunn av den i valsegodset ennå tilstedeværende temperatur, smelter. Da det belagte valsegods etter å ha forlatt dette kammeret fremdeles har en temperatur på ca. 700 til 600° C må det umiddelbart etter belegning avkjøles hurtig for å forhindre at det påførte sinkpulver forbrennes til for eksempel sinkoksid. In the case of rolling steel products produced in continuous processes, it is also already known to equip the rolled stock immediately after rolling and after peeling and to prevent new formation of the shell coating and during utilization of the rolling heat, to equip the steel with a corrosion-resistant coating, for example of zinc, see US-PS 2 442 485. The scale removal thus takes place in the last pass as a result of a strong reduction of the cross-section of the rolling stock associated with stretching, whereby the brittle coating is broken up so that the rolling stock leaves the apparatus essentially without coating. To achieve this condition, the goods after exiting are passed through a chamber with a temperature of 980 to 760°C and filled with a deoxidizing gas, preferably carbon monoxide, where this compound is burned to carbon dioxide. Immediately afterwards, the rolled stock runs through a further chamber where it is coated with, for example, zinc in the form of zinc powder which, due to the temperature still present in the rolled stock, melts. As the coated rolled stock after leaving this chamber still has a temperature of approx. 700 to 600° C, it must be cooled quickly immediately after coating to prevent the applied zinc powder from burning into, for example, zinc oxide.
Også denne fremgangsmåte er relativt kostbar. Renhold av den rensede overflate av valsegodset ved hjelp av en atmosfære av desoksiderende gass betinger ikke bare at denne holdes som lagervare, tilføres og at det opprettholdes en desoksyderende atmosfære i et på tilsvarende måte avtettet kammer, men også at det opprettholdes en tilsvarende temperatur, før valsegodset etter belegningen avkjøles ved hjelp av andre medier. På bakgrunn av dette har foreliggende oppfinnelse til oppgave å kunne belegge valsestålprodukter i en arbeidsoperasjon som følger umiddelbart etter valsingen under utnyttelse av valsevarmen, og derved å holde den produksjonsmessige og appara-tive innsats så lav som mulig. This method is also relatively expensive. Cleaning of the cleaned surface of the rolled stock by means of an atmosphere of deoxidizing gas requires not only that this is kept as stock, supplied and that a deoxidizing atmosphere is maintained in a correspondingly sealed chamber, but also that a corresponding temperature is maintained, before the rolled stock after coating is cooled using other media. Based on this, the present invention has the task of being able to coat rolled steel products in a work operation that follows immediately after rolling while utilizing the rolling heat, and thereby keep the production and apparatus effort as low as possible.
I henhold til oppfinnelsen løses denne oppgave ved at valsestålet i kontinuerlig fortsettelse av valsingen for gløde-skallfjerning behandles med trykkvann, at ståloverflaten umiddelbart efter glødeskallfjerning hurtig avkjøles til en temperatur under 600°C ved anvendelse av vann for å hindre nydannelse av glødeskall, og at det derefter påføres et belegg, og at det derefter eventuelt påføres et sjikt av en kunstharpiks, for eksempel en epoksyharpiks. According to the invention, this task is solved by the rolling steel being treated with pressurized water in the continuous continuation of rolling for scale removal, the steel surface immediately after scale removal being rapidly cooled to a temperature below 600°C using water to prevent new scale formation, and that a coating is then applied, and that a layer of an artificial resin, for example an epoxy resin, is then optionally applied.
Fordelen ved oppfinnelsen er fremfor alt at det både for avskalling og for å forhindre nydannelse av glødebelegg og samtidig for avkjøling, kun anvendes et eneste medium, nemlig vann, hvorved avkjølingen bringes så langt at valsevarmen kan utnyttes optimalt for beleggningen. The advantage of the invention is, above all, that only one medium is used, namely water, both for peeling and to prevent the new formation of annealed coating and at the same time for cooling, whereby the cooling is brought to such an extent that the rolling heat can be utilized optimally for the coating.
Derved oppnår man at alle fremgangsmåtetrinn henholdsvis behandlingsoperasjoner kan skje i kontinuerlig fortsettelse av valsingen, altså ved valsehastighet slik at det ferdig belagte sluttprodukt forlater produksjonsbanen analogt med et vanlig, ikke etterbehandlet valseprodukt. Thereby, it is achieved that all method steps or treatment operations can take place in continuous continuation of the rolling, i.e. at rolling speed so that the finished coated end product leaves the production path analogously to a normal, non-post-treated rolled product.
Ved bearbeiding av ståloverflaten med trykkvann under høyt trykk for glødeskallfjerning utnytter man et fenomen der valsestålet på grunn av valsingen får løsnet sitt glødeskall-belegg i det siste valseverk på grunn av en endring i tverr-snittet, for eksempel fra ovalt til sirkelformig tverrsnitt hvoretter glødeskallet relativt lett kan fjernes ved hjelp av trykkvann. Vanntrykket bør ligge over 200 bar og fortrinnsvis ved 3-400 bar, det kan imidlertid heves til ca. 1000 bar. Dette muliggjør en meget kort behandling, nemlig gjennomløp av vanlig valset stål gjennom en sprøytedyse som kun har en uvesentlig reduksjon av temperaturen som resultat. When processing the steel surface with pressurized water under high pressure for scale removal, a phenomenon is exploited where the rolled steel loosens its scale coating due to the rolling in the last rolling mill due to a change in cross-section, for example from an oval to a circular cross-section, after which the scale can be relatively easily removed using pressurized water. The water pressure should be above 200 bar and preferably at 3-400 bar, however it can be raised to approx. 1000 bar. This enables a very short treatment, namely the passage of ordinary rolled steel through a spray nozzle which only has an insignificant reduction in temperature as a result.
Mens glødeskallfjerningen skjer ved trykkvann ved valsevarmen ved en temperatur på ca. 900-1000°C gjennomføres deretter vannbehandlingen kontinuerlig for avkjøling av stålet slik at glødeskalldannelsestemperaturen på 600°C meget raskt under-skrides, det vil si at det ikke lenger dannes glødeskall og hvorved man når temperaturer der de ønskede belegg kan påføres. Dette kan i henhold til oppfinnelsen skje ved at valsestålet føres gjennom et vannbad eller besprøytes med vann. Egnede temperaturer for påføring av korrosjonsbe-standige belegg er for rent aluminium for eksempel ca. 560 til 570°C og for rent sink ca. 415°C; ved legeringer kan det kobles inn mellomtrinn. Således er det i henhold til oppfinnelsen uten videre mulig å påføre enhver ønsket legerering for belegget da alle temperaturområder gjennomløpes fra valsevarmen til fullstendig avkjøling. While the glow plug removal takes place with pressurized water at the roller heat at a temperature of approx. 900-1000°C, the water treatment is then carried out continuously to cool the steel so that the scale formation temperature of 600°C is very quickly dropped, that is to say that scale is no longer formed and thus temperatures are reached where the desired coatings can be applied. According to the invention, this can be done by passing the rolled steel through a water bath or spraying it with water. Suitable temperatures for applying corrosion-resistant coatings are for pure aluminium, for example approx. 560 to 570°C and for pure zinc approx. 415°C; in the case of alloys, an intermediate stage can be connected. Thus, according to the invention, it is easily possible to apply any desired alloy for the coating as all temperature ranges are run through from the rolling heat to complete cooling.
Påføring av belegget kan skje på en hvilken som helst ønsket måte. Ikke-jernmetallet som utgjør belegget kan sprøytes på i pulverform hvorved det smeltes på; valsestålet kan imidlertid føres gjennom et bad av flytende ikke-jernmetal1. The coating can be applied in any desired way. The non-ferrous metal that makes up the coating can be sprayed on in powder form whereby it is melted on; however, the rolled steel can be passed through a bath of liquid non-ferrous metal1.
Mens valsestålet etter glødeskallbeleggfjerningen beskyttes mot en ny skalldannelse ved vannbehandlingen, besørger denne beskyttelse etter påføring av belegget, valsestålet med belegg helt til fullstendig avkjøling. I mange tilfeller kan det være på sin plass på belegget, for eksempel av sink, å påføre et ytterligere beskyttelsessjikt av en kunstharpiks, for eksempel epoksyharpiks. Også en slik arbeidsoperasjon kan uten videre integreres i oppfinnelsens fremgangsmåte under utnyttelse av restvarmen. While the rolled steel after the glow scale coating removal is protected against a new scale formation during the water treatment, this protection after application of the coating provides the rolled steel with the coating until complete cooling. In many cases, it may be appropriate to apply an additional protective layer of a synthetic resin, such as epoxy resin, to the coating, for example of zinc. Such a work operation can also be easily integrated into the method of the invention while utilizing the residual heat.
Da valsestålet i henhold til oppfinnelsen etter glødeskall-fjerning avkjøles med vann, kan denne behandling også skje i form av i og for seg kjente behandlingsmetoder under anvendelse av vann. En slik skjer for eksempel ved karbonfattige og derved sveisegunstige betongstål under betegnelsen "Temp-core"-fremgangsmåten der vannbehandlingen skjer på en slik måte at det i valsestålet umiddelbart etter bråkjøling foreligger en randsone av martensitt og bainitt, mens det i stålkjernen foreliggende varmeinnhold i løpet av den etter-følgende avkjøling bevirker en anløpning av kantsonen som ikke går ut over bainitt-trinnet. Ved karbonrike og som forspent stål egnede metaller blir vannbehandlingen ført på en slik måte at stålene bråkjøles fra en sluttvalsetemperatur på mellom 860 og 1060° C slik at det i randsonen dannes et fullstendig martensittisk gitter og temperaturen i randsonen ved temperaturut j evning i løpet av 2 til 6 sekunder etter påbegynt avkjøling utgjør 400 til 500°C. På denne måte kan den ifølge oppfinnelsen tenkte fremgangsmåte skje på spesielt fordelaktig måte for å forbedre fastheten i stålet. Since, according to the invention, the rolled steel is cooled with water after annealing scale removal, this treatment can also take place in the form of per se known treatment methods using water. This happens, for example, with low-carbon and therefore welding-friendly concrete steel under the term "Temp-core" method, where the water treatment takes place in such a way that in the rolled steel immediately after quenching there is an edge zone of martensite and bainite, while the heat content present in the steel core during of the subsequent cooling causes a tarnishing of the edge zone which does not go beyond the bainite step. In the case of metals rich in carbon and suitable as prestressed steel, the water treatment is carried out in such a way that the steels are quenched from a final rolling temperature of between 860 and 1060° C so that a complete martensitic lattice is formed in the edge zone and the temperature in the edge zone upon temperature equalization within 2 to 6 seconds after cooling has started amounts to 400 to 500°C. In this way, the method conceived according to the invention can be carried out in a particularly advantageous manner in order to improve the strength of the steel.
En ytterligere fordel ved oppfinnelsen ligger til slutt i at alle arbeidstrinn skjer kontinuerlig umiddelbart etter valsingen i enkelte etter valseverket ordnede behandlings-posisjoner. Avhengig av den på grunn av valsing av enkelt-stykker nødvendige diskontinuerlige arbeidsmetoder, kan man også trekke nytte av oppfinnelsen hvis det på forhånd skjer en sveising eller festing av kubbene ved valsingen til en paternostervalse. Dette skjer på spesielt fordelaktig måte ved i og for seg kjente flyvende avbrenningsstumpsveising av kubbene i området mellom utgang fra ovnen henholdsvis utgangen fra et triovalseverk og det første innløp i en f invalsebane. Finally, a further advantage of the invention lies in the fact that all work steps take place continuously immediately after rolling in certain processing positions arranged according to the rolling mill. Depending on the discontinuous working methods necessary due to the rolling of individual pieces, one can also benefit from the invention if a welding or fastening of the blocks takes place in advance during the rolling of a paternoster roll. This takes place in a particularly advantageous way by the per se known flying burn-off butt welding of the ingots in the area between the exit from the furnace and the exit from a three-rolling mill and the first inlet in a rolling lane.
Claims (7)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3729177A DE3729177C1 (en) | 1987-09-01 | 1987-09-01 | Process for treating rolled steel to increase resistance to corrosion |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| NO883781D0 NO883781D0 (en) | 1988-08-24 |
| NO883781L NO883781L (en) | 1989-03-02 |
| NO176578B true NO176578B (en) | 1995-01-16 |
| NO176578C NO176578C (en) | 1995-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO883781A NO176578C (en) | 1987-09-01 | 1988-08-24 | Process for treating roll steel to increase corrosion resistance |
Country Status (15)
| Country | Link |
|---|---|
| EP (1) | EP0305914B1 (en) |
| JP (1) | JPS6475692A (en) |
| CN (1) | CN1031724A (en) |
| AT (1) | ATE70568T1 (en) |
| CA (1) | CA1306391C (en) |
| DD (1) | DD282246A5 (en) |
| DE (2) | DE3729177C1 (en) |
| DK (1) | DK460688A (en) |
| ES (1) | ES2028964T3 (en) |
| GR (1) | GR3004067T3 (en) |
| HU (1) | HU203586B (en) |
| NO (1) | NO176578C (en) |
| PL (1) | PL158408B1 (en) |
| PT (1) | PT88371B (en) |
| SU (1) | SU1674689A3 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1005964A6 (en) * | 1992-06-29 | 1994-04-05 | Centre Rech Metallurgique | Protection method of hot rolled steel product. |
| GB2313382A (en) * | 1996-05-23 | 1997-11-26 | Vidal Henri Brevets | Metal coating |
| DE19828827C1 (en) * | 1998-06-27 | 2000-07-20 | Grillo Werke Ag | Thermal sprayed corrosion layer for reinforced concrete and method of manufacturing the same |
| DE102004059008A1 (en) * | 2004-12-08 | 2006-06-14 | Volkswagen Ag | Coating metal components comprises selectively applying a less noble metal than that of the component |
| CN202925384U (en) * | 2012-10-29 | 2013-05-08 | 厦门新钢金属制品有限公司 | Complex coating ballastless track board insulation reinforcing steel bar |
| CN102912692A (en) * | 2012-10-29 | 2013-02-06 | 厦门新钢金属制品有限公司 | Ballastless track slab insulating bar reinforcement with composite coating |
| US20150218815A1 (en) * | 2014-01-31 | 2015-08-06 | Mortar Net Usa, Ltd. | Corrosion resistant structural reinforcement member |
| RU2573304C9 (en) * | 2014-03-11 | 2016-05-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования Пензенский государственный университет архитектуры и строительства | Increasing life and hardness of rod- and pipe-type reinforcements |
| CN104878332B (en) * | 2015-06-03 | 2017-08-01 | 河北钢铁股份有限公司邯郸分公司 | A kind of raising production method of the hot radical galvanized sheet with product decay resistance |
| DE102016106421A1 (en) | 2016-04-08 | 2017-10-12 | Andrey Senokosov | Cleaning process for riser pipes and equipment therefor |
| CN106040755B (en) * | 2016-07-16 | 2018-02-27 | 太原科技大学 | Cathodic protection rollgang equipped with conductive carrying roller |
| CN106001133B (en) * | 2016-07-16 | 2018-02-27 | 太原科技大学 | It is formed with the rollgang of sagging exposed electric wire cathodic protection |
| CN107794476A (en) * | 2017-09-11 | 2018-03-13 | 常熟市双羽铜业有限公司 | A kind of corrosion resisting steel structural member |
| CN109821923A (en) * | 2019-02-26 | 2019-05-31 | 桂林理工大学 | A kind of production method of anti-corrosion coating plain bar |
| CN115261733B (en) * | 2022-08-18 | 2023-06-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Abrasion-resistant corrosion-resistant steel rail for subway and production method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2442485A (en) * | 1944-06-24 | 1948-06-01 | Frederick C Cook | Method of descaling and coating hot-rolled ferrous metal |
| DE1602129B1 (en) * | 1967-06-21 | 1970-08-27 | Roechlingsche Eisen & Stahl | Cooling pipe for cooling rolled material |
| DE2108314A1 (en) * | 1970-08-05 | 1972-02-10 | VEB Schwermaschinenbau-Kombinat Ernst Thallmann Magdeburg, χ 3011 Magdeburg | Rapid cooling rolled rod - of structural steel by a controlled - water quench method |
| DE2353034B2 (en) * | 1972-10-31 | 1980-03-13 | Centre De Recherches Metallurgiques- Centrum Voor Research In De Metallurgie, Bruessel | Process for improving the mechanical strength values of rolled steel products |
| DE3125146A1 (en) * | 1981-06-26 | 1983-01-13 | Woma-Apparatebau Wolfgang Maasberg & Co Gmbh, 4100 Duisburg | Device for descaling hot steel ingots |
-
1987
- 1987-09-01 DE DE3729177A patent/DE3729177C1/en not_active Expired
-
1988
- 1988-08-17 DK DK460688A patent/DK460688A/en not_active Application Discontinuation
- 1988-08-18 HU HU884397A patent/HU203586B/en unknown
- 1988-08-24 NO NO883781A patent/NO176578C/en unknown
- 1988-08-25 PL PL1988274389A patent/PL158408B1/en unknown
- 1988-08-26 EP EP88113916A patent/EP0305914B1/en not_active Expired - Lifetime
- 1988-08-26 AT AT88113916T patent/ATE70568T1/en not_active IP Right Cessation
- 1988-08-26 SU SU884356320A patent/SU1674689A3/en active
- 1988-08-26 ES ES198888113916T patent/ES2028964T3/en not_active Expired - Lifetime
- 1988-08-26 DE DE8888113916T patent/DE3866998D1/en not_active Expired - Fee Related
- 1988-08-29 DD DD88319281A patent/DD282246A5/en not_active IP Right Cessation
- 1988-08-30 PT PT88371A patent/PT88371B/en not_active IP Right Cessation
- 1988-08-31 JP JP63215357A patent/JPS6475692A/en active Granted
- 1988-08-31 CA CA000576161A patent/CA1306391C/en not_active Expired - Fee Related
- 1988-08-31 CN CN88106460A patent/CN1031724A/en active Pending
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1992
- 1992-03-18 GR GR920400458T patent/GR3004067T3/el unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES2028964T3 (en) | 1992-07-16 |
| GR3004067T3 (en) | 1993-03-31 |
| DK460688D0 (en) | 1988-08-17 |
| PL158408B1 (en) | 1992-08-31 |
| EP0305914A2 (en) | 1989-03-08 |
| DK460688A (en) | 1989-03-02 |
| JPH0445591B2 (en) | 1992-07-27 |
| ATE70568T1 (en) | 1992-01-15 |
| EP0305914A3 (en) | 1989-08-09 |
| DE3866998D1 (en) | 1992-01-30 |
| DE3729177C1 (en) | 1989-01-05 |
| NO883781D0 (en) | 1988-08-24 |
| CN1031724A (en) | 1989-03-15 |
| NO176578C (en) | 1995-04-26 |
| EP0305914B1 (en) | 1991-12-18 |
| HU203586B (en) | 1991-08-28 |
| JPS6475692A (en) | 1989-03-22 |
| PT88371B (en) | 1993-02-26 |
| DD282246A5 (en) | 1990-09-05 |
| NO883781L (en) | 1989-03-02 |
| SU1674689A3 (en) | 1991-08-30 |
| PL274389A1 (en) | 1989-04-17 |
| PT88371A (en) | 1989-07-31 |
| CA1306391C (en) | 1992-08-18 |
| HUT52178A (en) | 1990-06-28 |
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