US3826681A - Method for protecting a hot rolled ferrous product - Google Patents

Method for protecting a hot rolled ferrous product Download PDF

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Publication number
US3826681A
US3826681A US11259471A US3826681A US 3826681 A US3826681 A US 3826681A US 11259471 A US11259471 A US 11259471A US 3826681 A US3826681 A US 3826681A
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US
United States
Prior art keywords
product
scaling
rolled
silicon
ferrous product
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Expired - Lifetime
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English (en)
Inventor
M Vialle
M Turpin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WENDELL SIDELOR SA
Wendell Sidelor Sa fr
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WENDELL SIDELOR SA
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    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for de-scaling and protecting against subsequent oxidation or scaling a hot-rolled ferrous product, such as thick, medium or thin sheets, bars, structural shapes, wire and the like.
  • This water spraying process has been proposed in order to supply a protective liquid which vaporizes when it enters into contact with the hot surface of the rolled product and deposits on it a protective film. It has also been proposed to separate the water spraying process from the spraying of the protective liquid. In any event, the products which were previously proposed do not permit the protection of the article in only one step.
  • the aim of the present invention is to avoid all these inconveniences and to provide a protective material that is operable in one step to practically eliminate at a high temperature all the scale which covers the metallurgical products during their hot rolling process, and to assure at the same time their protection against subsequent re-oxidation.
  • the primary object of the present invention is to provide a material for de-oxidizing and protecting ferrous products against oxidation during the hot rolling process, characterized in that the treating material is a chlorinated compound of silicon.
  • This protective material comprises either a chlorinated compound of silicon which only contains silicon and chlorine, a chlorinated derivative of silane (specifically, methyltrichlorosilane), a chlorinated derivative of silane which only contains the elements silicon, chlorine and hydrogen, a chlorinated derivative of silane which only contains the elements silicon, chlorine, hydrogen and carbon, a chlorinated derivative of silane of the type RSICl R being an organic radical, a chlorinated derivative of silane of the type R SiCI R being an organic radical, or a chlorinated derivative of silane of the type R SiCl, wherein R is an organic radical.
  • a chemically active body is added to the de-scaling materials, or a body which is substantially chemically inert relative to the ferrous products at a temperature of at least 800 C. is added to said de-scaling material.
  • a further object of the present invention is to provide a process for applying the above-mentioned material, which process is characterized by passing the hot rolled ferrous product as it comes out of the rolling mill through a closed housing within which the de-scaling and protective material is sprayed onto the rolled product at a temperature ranging between 800 and 1200 C.
  • the de-scaling material is sprayed in atomized form.
  • the de-scaling material may be emulsified in a carrier gas or evaporated to the vapor stage by a heater or boiler for circulation through the housing.
  • the de-scaling material may be injected in a liquid or gaseous condition into a reducing flame which licks the hot rolled product.
  • a further object of the invention is to provide apparatus for performing the above mentioned process, including a housing through which the ferrous product passes, inert gas seal means for sealing the entrance and exit openings of the housing, and means for spraying the descaling material onto the rolled products.
  • the de-scaling material is sprayed in atomized form onto the hot rolled product, while in another embodiment, boiler means are provided for vaporizing the de-scaling material prior to spraying.
  • the housing includes a plurality of chamber sections which are separated by partitions that contain coaxially arranged openings which permit the hot-rolled product to pass therethrongh, the spray means being arranged in such a way as to spray the product at different angles, whereby means are provided for regulating the discharge in each chamber.
  • the means for spraying the de-scaling material onto the rolled products include openings connected with heater means which vaporize the tie-scaling material or which emulsify it in a gas carrier.
  • the housing includes several chambers separated by partitions that contain coaxial openings through which the rolled ferrous product is transported, and means are provided for regulating the intake of vapors in each chamber.
  • the invention also relates to the resultant ferrous product that is produced by the aforementioned process and apparatus, which product is protected against re-oxidation by a protective surface layer comprising a simple or complex iron-silicon compound.
  • FIG. 1 is a schematic view in a vertical section of a first embodiment of the apparatus of the present invention, wherein the de-scaling material is applied in atomized form with the aid of a carrier;
  • FIG. 2 is a sectional view taken along line IIII of FIG. 1;
  • FIG. 3 is a schematic vertical section of a second embodiment which sprays the de-scaling material in the form of a vapor;
  • FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;
  • FIG. 5 shows two representative curves of the oxidation coefiicient of a wire treated by the process according to the invention and of a standard comparison wire at 1000 C. temperature.
  • the most adequate material for de-scaling and simultaneously protecting a hot rolled ferrous product against oxidation is a chlorinated compound of silane which may contain an organic radical.
  • methyltrichlorosilane which material is a liquid body under atmospheric pressure and ambient temperature.
  • methyltrichlorosilane when sprayed on a ferrous product between 800 and 1200 C. (which is the optimal range of temperatures), ignites spontaneously when in contact with the air. Consequently, the advisable application of this material is for it to be sprayed in a sealed housing through which the product to be protected is transported, in order to avoid contact between the methyltrichlorosilane vapor, at a high temperature, with the oxygen of the air.
  • a material such as lime or silica
  • the inert substance can in a certain way play the role of a load for facilitating the distribution of the de-scaling product.
  • chlorosilane compounds which also give favorable results are:
  • the reaction between the silane compounds and the ferrous product takes place at a high temperature at approximately 1000 C. (as it is mentioned above in the case of methyltrichlorosilane) Consequently, according to the temperature of the product, it may be useful in order to obtain the desired reaction, either to reheat the surface of the product before treatment, or to reheat the vapors of the reacting material, or to use the atomization of this material or emulsion in a carrying gas or a preliminary boiling, or an injection of the liquid or gaseous material into a reducing flame.
  • FIGS. 1 and 2 illustrate an apparatus for spraying atomized particles of the treating material.
  • Two rolls 1-1 of the rolling mill have been shown schematically for supplying the hot rolled ferrous product 2.
  • the rolled product 2 has been shown as entering into the device immediately after the last roll pair of the hot rolling mill. This of course is not always necessary.
  • the installation may be before the first stand, after the last stand, or even between the former and the latter.
  • a reheating of the product when using methyltrichlorosilane is not always necessary because after last pass the rolled products are more or less at the desired temperature.
  • the device comprises a housing 3 through which the rolled product is transported.
  • injection means are provided for supplying an inert gas (as, for example, nitrogen, argon or another appropriate gas) via the supply pipe 6.
  • Housing 3 includes three chambers, 7, 8 and 9 defined by partitions 10, 11, which partitions contain co-axial openings 13 and 14 which receive and guide the bar 2.
  • Each chamber has a plurality of pulverizing nozzles 15 which are supplied with fluid through pipes 16, 17, 18 via distribution manifolds 16a, 17a, 18a.
  • the pipes are provided with valves 19, 20, 21 which afford independent regulation of the flow of the liquid into each chamber.
  • the injection nozzles 15 are directed differently in each chamber in order to achieve a complete application of the de-scaling material.
  • the atomization circuit which is conventional, comprises also a container 22 which contains the material which is being used, for instance methyltrichlorosilane.
  • the liquid is fed into the atomizer means by means of a pump 23 which discharges onto a pipe 24.
  • the liquid coming from the operation is re-cycled through a separation reservoir 25 and a pump 26, and forced back through a pipe 27 into the vat 22.
  • the reservoir 25 which receives the liquid through a collection manifold 5a is provided with an overflow 28.
  • Adjacent the container 22 pipes 29, 30 and 31 and valve means 32 and 33 are provided for isolating the container from the atomization circuit and for regulating the flow of material.
  • FIGS. 3 and 4 show an installation which applies the treating material through vaporization.
  • parts shown with the primed reference numbers correspond with similar elements in FIGS. 1 and 2.
  • each chamber is provided with openings 34 through which the vapors of the de-scaling product arrive.
  • the vaporizing circuit is also conventional.
  • the de-scaling liquid arrives through a pipe 35 into a boiler 36 inside of which a heating coil 37 has been installed.
  • the vapor comes out through pipe 36a and is supplied to the openings 34 via the regulating valve 36b, the accleration pump 38, conduit 39 and distributor pipes 40.
  • the excess product flows out at the lower part of the enclosure through pipes 41 and return pipe 42 into a separation and condensation sphere 43 provided with an exhaust conduit 45.
  • a pump 46 returns the liquid product to the boiler 36 via return pipe 47.
  • gaseous reagent which circulates between the evaporating boiler 36 and the housing 3 is maintained at an adequate temperature in order to avoid its condensation by means of considerable insulation or a heating flue.
  • the protective surface layer obtained in accordance with the present invention has an iron-silicon compound base, and that the layer is extremely thin. Furthermore its aspect is particularly satisfactory and for instance samples of wire treated in this manner have a brilliant aspect after having been dipped in nitrogen or argon in order to bring them back to the ambient temperature.
  • the two curves illustrate, respectivelv. the oxidation coefficient of a wire treated in accordance with the present invention, and the oxidation coefiicient of a reference sample wire.
  • the abscissa and ordinates of this figure illustrate, respectively, the time in minutes and the oxidation coefficient (i.e., the weight increase in mg. per cm. due to the oxidation of the metal). It is apparent that the resistance to oxidation of the treated wire is infinitely superior to that of the nontreated wire.
  • chlorine-containing derivative of silane is RSiCl R being an organic radical.
  • chlorine-containing derivative of silane is R SiCl R being an organic radical.
  • chlorine-containing derivative of silane is R SiCl, R being an organic radical.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
US11259471 1970-02-09 1971-02-04 Method for protecting a hot rolled ferrous product Expired - Lifetime US3826681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7004451A FR2077716A1 (enrdf_load_stackoverflow) 1970-02-09 1970-02-09

Publications (1)

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US3826681A true US3826681A (en) 1974-07-30

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Country Status (9)

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US (1) US3826681A (enrdf_load_stackoverflow)
BE (1) BE762304A (enrdf_load_stackoverflow)
CA (1) CA962560A (enrdf_load_stackoverflow)
DE (1) DE2105553A1 (enrdf_load_stackoverflow)
ES (1) ES388059A1 (enrdf_load_stackoverflow)
FR (1) FR2077716A1 (enrdf_load_stackoverflow)
GB (1) GB1286221A (enrdf_load_stackoverflow)
LU (1) LU62567A1 (enrdf_load_stackoverflow)
NL (1) NL7101216A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4623561A (en) * 1985-07-15 1986-11-18 Hoogovens Groep B.V. Method of marking a hot steel slab

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1588468A (en) * 1976-09-18 1981-04-23 Nippon Steel Corp Method of producing steel strip by hot rolling
IT1160196B (it) * 1983-02-24 1987-03-04 Dalmine Spa Procedimento di disossidazione a caldo di tubi metallici semilavorati
CN116637948A (zh) * 2023-07-11 2023-08-25 南京钢铁股份有限公司 一种粗除鳞箱集管和高压水喷嘴的保护装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4623561A (en) * 1985-07-15 1986-11-18 Hoogovens Groep B.V. Method of marking a hot steel slab

Also Published As

Publication number Publication date
LU62567A1 (enrdf_load_stackoverflow) 1971-08-19
GB1286221A (en) 1972-08-23
BE762304A (fr) 1971-07-01
ES388059A1 (es) 1973-05-01
NL7101216A (enrdf_load_stackoverflow) 1971-08-11
CA962560A (en) 1975-02-11
FR2077716A1 (enrdf_load_stackoverflow) 1971-11-05
DE2105553A1 (de) 1971-10-07

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