GB2211116A - A method of processing electrical steels - Google Patents

A method of processing electrical steels Download PDF

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Publication number
GB2211116A
GB2211116A GB8824059A GB8824059A GB2211116A GB 2211116 A GB2211116 A GB 2211116A GB 8824059 A GB8824059 A GB 8824059A GB 8824059 A GB8824059 A GB 8824059A GB 2211116 A GB2211116 A GB 2211116A
Authority
GB
United Kingdom
Prior art keywords
strip
corrosion inhibitor
processing electrical
kent
steel
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.)
Granted
Application number
GB8824059A
Other versions
GB2211116B (en
GB8824059D0 (en
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 GB8824059D0 publication Critical patent/GB8824059D0/en
Publication of GB2211116A publication Critical patent/GB2211116A/en
Application granted granted Critical
Publication of GB2211116B publication Critical patent/GB2211116B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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

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  • 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)

Description

2211-116 PROCESSING ELECTRICAL STEELS This invention relates to the
processing of steels for electromagnetic applications. Such 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% Conventionally, 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 is carried out in the presence of a lubricant which reduces the mill load and also acts as a mill coolant. In the second cold rolling stage this lubricant additionally includes a rust inhibitor necessary to protect the coil during storage and dispatch.
It is an object of this tnvention to provide a more economical process route for such steels whilst still maintaining an adequate degree of protection (against rusting) to the product during storage and dispatch.
The present invention provides a method of processing electrical steel by hot rolling cast stock into strip and coiling same, descaling and then cold rolling the. strip to its final gauge, continuously annealing said strip in a decarburising atmosphere, coating the strip with a corrosion inhibitor, and drying and coiling same for despatch.
Compared with the conventional process hitherto therefore, the second stage rolling, or extension pass, has been dispensed with and the provision of a rust inhibiting coating stage downstream of the annealing furnace has preserved the "coil protection" aspect.
Further, by dispensing with the separate second stage cold roll a better surface finish is maintained on the strip and with the coating developed for this process this finish is preserved for a longer period than hitherto and the strip surface i's much cleaner and brighter.
The slight reduciton 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 preferably water-borne and oil free; one example of such a coating comprises a 1% solution in water of dicyclohexyl ammonium 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 P1260. The solution is non-combustible and relatively non-toxic and cheap; further, it does not stain the strip.
It has been found that this solution readily wets the strip and has a relatively low temperature of evaporation thus leaving the VP1260 evenly distributed and bound to the strip surface by the "invisible" layer of Synperonic LF/RA 30.
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 then passes through a drying oven before coiling.
A typical rate of usage is 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 0.051%.
TEC/827/MB/09/K 2 13/09/1988

Claims (6)

CLAIM: -
1. A method of processing electrical steel by hot rolling cast stock into strip and coiling same, descaling and then cold rolling the strip to its final gauge, continuously annealing said strip in a decarburising atmosphere, coating the strip with a corrosion inhibitor, and drying and coiling same for despatch.
2. A method according to claim 1, in which the corrosion inhibitor is applied to the strip in its dry state immediately on exiting the annealing furnace via a pair of smooth coating rolls.
3. A method according to claim 1 or claim 2 in which the corrosion inhibitor is water-borne and oil free.
4. A method according to claim 3, in which the corrosion inhibitor includes a dicyclohexylammonium nitrate and a wetting agent of the alkoxylate family.
5. A method of processing electrical steel, substantially as herein described.
6. Steel Strip processed in accordance with a method as claimed in any one of claims 1 to 5.
TFC/279/CDB/08/G 3 14/0 9/1988 Published 1989atThePatentofnce, State House, 56171 HolbornLOndonWC1R4TP. Further copies maybe obtainedfrom The PatentOfnce. Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con. 1187
GB8824059A 1987-10-17 1988-10-13 Processing electrical steels Expired - Fee Related GB2211116B (en)

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
GB8824059D0 GB8824059D0 (en) 1988-11-23
GB2211116A true GB2211116A (en) 1989-06-28
GB2211116B GB2211116B (en) 1991-06-26

Family

ID=10625494

Family Applications (2)

Application Number Title Priority Date Filing Date
GB878724387A Pending GB8724387D0 (en) 1987-10-17 1987-10-17 Processing electrical steels
GB8824059A Expired - Fee Related GB2211116B (en) 1987-10-17 1988-10-13 Processing electrical steels

Family Applications Before (1)

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

Country Status (3)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69403189T2 (en) * 1994-01-11 1997-08-28 Cortec Corp Vapor phase corrosion inhibiting and drying material

Citations (3)

* 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
GB2060697A (en) * 1979-08-22 1981-05-07 Nippon Steel Corp Grain-oriented silicon steel production
EP0162710A2 (en) * 1984-05-24 1985-11-27 Kawasaki Steel Corporation Method for producing grain-oriented silicon steel sheets

Family Cites Families (6)

* 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 (en) * 1951-06-21 1953-01-05 Armco Int Corp Process for the production of electrical steel strip
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 (en) * 1978-03-14 1978-09-14 Centre Rech Metallurgique PROCESS FOR THE SURFACE TREATMENT OF A METAL STRIP
JPS6052531A (en) * 1983-09-02 1985-03-25 Nippon Steel Corp Aqueous solution for cooling cold-rolled steel strip

Patent Citations (3)

* 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
GB2060697A (en) * 1979-08-22 1981-05-07 Nippon Steel Corp Grain-oriented silicon steel production
EP0162710A2 (en) * 1984-05-24 1985-11-27 Kawasaki Steel Corporation Method for producing grain-oriented silicon steel sheets

Also Published As

Publication number Publication date
DE3879863T2 (en) 1993-07-22
GB2211116B (en) 1991-06-26
DE3879863D1 (en) 1993-05-06
GB8824059D0 (en) 1988-11-23
EP0312883A1 (en) 1989-04-26
EP0312883B1 (en) 1993-03-31
GB8724387D0 (en) 1987-11-18

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19991013