EP0312883B1 - Behandlungsverfahren von Elektrostahl - Google Patents

Behandlungsverfahren von Elektrostahl Download PDF

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Publication number
EP0312883B1
EP0312883B1 EP88116829A EP88116829A EP0312883B1 EP 0312883 B1 EP0312883 B1 EP 0312883B1 EP 88116829 A EP88116829 A EP 88116829A EP 88116829 A EP88116829 A EP 88116829A EP 0312883 B1 EP0312883 B1 EP 0312883B1
Authority
EP
European Patent Office
Prior art keywords
strip
corrosion inhibitor
coating
steel
processing electrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88116829A
Other languages
English (en)
French (fr)
Other versions
EP0312883A1 (de
Inventor
James Herbert Richard Page
Gwilym Leslie Woodman
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.)
British Steel PLC
Original Assignee
British Steel PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Steel PLC filed Critical British Steel PLC
Publication of EP0312883A1 publication Critical patent/EP0312883A1/de
Application granted granted Critical
Publication of EP0312883B1 publication Critical patent/EP0312883B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/02—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase inhibitors
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length

Definitions

  • This invention relates to the processing of steels for electromagnetic applications.
  • steels are styled electrical steels and may contain up to 3.25% silicon, e.g. non-oriented silicon steel, but the invention also embraces such steels having no added silicon, so called “non-silicon” steels which only contain silicon in very low concentrations, e.g. ⁇ 0.05%.
  • such steels produced via either an ingot route or a continuously cast route are rolled into hot band, descaled by pickling, cold rolled, continuously annealed in a decarburising atmosphere and then cold rolled again into the final gauge.
  • An optional further anneal may be made, e.g. by the customer to minimise deterioration of magnetic properties.
  • the cold reduction may be carried out in the presence of a lubricant, e.g. the oil-in-water emulsion as described in UK Patent No.1354480, which reduces the mill load and also acts as a mill coolant.
  • a lubricant e.g. the oil-in-water emulsion as described in UK Patent No.1354480, which reduces the mill load and also acts as a mill coolant.
  • the present invention provides a method of processing electrical steel by hot rolling cast stock into strip and coiling same, descaling and then rolling the steel strip to its final gauge in a single stage cold rolling step, and continuously annealing said strip in a decarburising atmosphere, characterised by then coating the strip surface with a wholly organic water-borne oil-free corrosion inhibitor, and drying and coiling the strip for despatch.
  • This invention thus provides a "fully-processed" route as distinct from some "semi-processed” electrical steel routes adopted hitherto, see e.g. Journal of Metals (1986) pp 18-26 and further, as distinct from processes of this nature applied to "electrical" steels for electromagnetic applications which utilise cured insulating coatings, this invention does not embody such a hard surfacing treatment, e.g. as disclosed in BHP Technical Bulletin Vol. 25 No.2 1981 pp 25-30, but instead embodies a much simpler and cheaper coating step.
  • the second stage rolling, or extension pass has been dispensed with whereas the provision of a rust inhibiting coating stage downstream of the annealing furnace has preserved the "coil protection" aspect.
  • the slight reduction in hardness of the strip, occasioned by dispensing with the second stage rolling, may be compensated by the use of steel grades having a higher phosphorus and/or manganese content.
  • the coating is oil free; one example of such a coating comprises a 1% solution in water of dicyclohexylammonium nitrite (typically the product VP1260) together with 0.1% of a wetting agent of the alcohol alkoxylate family (typically the product Synperonic LF/RA 30) having low foaming properties, and which does not react with or adversely affect the solubility of VP1260.
  • the solution is non-combustible and relatively non-toxic and cheap; further, it does not stain the strip.
  • the coating solution is applied to the strip in its dry state immediately on exiting from the continuous annealing furnace, via a pair of smooth coating rolls, whence it the passes through a drying oven before coiling.
  • a typical rate of usage is 4,55 dm3 (one gallon) per tonne of steel strip of, say, 0.65 mm gauge. Tests on stored coils have shown that over 40 mg/sq.m of the residual corrosion inhibitor was still present after a storage period of six weeks.
  • the silicon content of the steel may conveniently be ⁇ 0.6%, preferably ⁇ 0.05%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)

Claims (3)

  1. Verfahren zur Bearbeitung von Elektrostahl durch Warmwalzen von Gußmaterial in Bandform und Aufwickeln desselben, Entzundern und anschließendes Walzen des Stahlbandes in einem einstufigen Kaltwalzschritt auf sein Endmaß und kontinuierliches Glühen des genannten Bandes in einer Entkohlungsatmosphäre, gekennzeichnet durch anschließendes Beschichten der Stahlbandoberfläche mit einem vollorganischen, ölfreien Korrosionsschutzmittel auf Wasserbasis und Trocknen und Aufwickeln des Bandes für den Transport.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Auftrag des Korrosionsschutzmittel auf das Band in dessen trockenem Zustand unmittelbar nach Austritt aus dem Glühofen mittels eines Paares glatter Beschichtungswalzen erfolgt.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß das Korrosionsschutzmittel Dicyclohexylammoniumnitrit und ein Benetzungsmittel aus der Reihe der Alkoxylate enthält.
EP88116829A 1987-10-17 1988-10-11 Behandlungsverfahren von Elektrostahl Expired - Lifetime EP0312883B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878724387A GB8724387D0 (en) 1987-10-17 1987-10-17 Processing electrical steels
GB8724387 1987-10-17

Publications (2)

Publication Number Publication Date
EP0312883A1 EP0312883A1 (de) 1989-04-26
EP0312883B1 true EP0312883B1 (de) 1993-03-31

Family

ID=10625494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116829A Expired - Lifetime EP0312883B1 (de) 1987-10-17 1988-10-11 Behandlungsverfahren von Elektrostahl

Country Status (3)

Country Link
EP (1) EP0312883B1 (de)
DE (1) DE3879863T2 (de)
GB (2) GB8724387D0 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69403189T2 (de) * 1994-01-11 1997-08-28 Cortec Corp Dampfphasenkorrosioninhibierendes und trocknendes Material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1430692A (en) * 1973-01-22 1976-03-31 Nippon Steel Corp Method of producing grain oriented electrical steel sheet

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449962A (en) * 1946-03-26 1948-09-21 Shell Dev Dicyclohexylammonium nitrite and its preparation
DE861702C (de) * 1951-06-21 1953-01-05 Armco Int Corp Verfahren zur Herstellung von Elektrobandstahl
GB1354480A (en) * 1970-05-06 1974-06-05 Croda Chemicals Ltd Wet temper rolling emulsion
US4116701A (en) * 1977-03-08 1978-09-26 Conner Alvin James Sen Metal corrosion inhibitor
BE864899A (fr) * 1978-03-14 1978-09-14 Centre Rech Metallurgique Procede pour le traitement superficiel d'une bande metallique
JPS5945730B2 (ja) * 1979-08-22 1984-11-08 新日本製鐵株式会社 高磁束密度一方向性珪素鋼板の熱延方法
JPS6052531A (ja) * 1983-09-02 1985-03-25 Nippon Steel Corp 冷延鋼帯の冷却用水溶液
DE3572197D1 (en) * 1984-05-24 1989-09-14 Kawasaki Steel Co Method for producing grain-oriented silicon steel sheets

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1430692A (en) * 1973-01-22 1976-03-31 Nippon Steel Corp Method of producing grain oriented electrical steel sheet

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BHP Technical Bulletin, vol. 25, no. 2, November 1981, "Electrical Steels Produced by Vacuum Degassing and Continuous Casting", T.W. Smythe, pages 25-30 *
JOURNAL OF METALS, January 1986, "Nonoriented Electrical Steels", G. Lyudkovsky et al., pages 18-26 *

Also Published As

Publication number Publication date
DE3879863T2 (de) 1993-07-22
GB2211116B (en) 1991-06-26
DE3879863D1 (de) 1993-05-06
GB8824059D0 (en) 1988-11-23
EP0312883A1 (de) 1989-04-26
GB2211116A (en) 1989-06-28
GB8724387D0 (en) 1987-11-18

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