GB2277701A - Coating of steels - Google Patents

Coating of steels Download PDF

Info

Publication number
GB2277701A
GB2277701A GB9407474A GB9407474A GB2277701A GB 2277701 A GB2277701 A GB 2277701A GB 9407474 A GB9407474 A GB 9407474A GB 9407474 A GB9407474 A GB 9407474A GB 2277701 A GB2277701 A GB 2277701A
Authority
GB
United Kingdom
Prior art keywords
coating
steel
stretch
proceeding
tempering
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.)
Withdrawn
Application number
GB9407474A
Other versions
GB9407474D0 (en
Inventor
Philip Beckley
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.)
ORB Electrical Steels Ltd
Original Assignee
ORB Electrical Steels Ltd
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 ORB Electrical Steels Ltd filed Critical ORB Electrical Steels Ltd
Publication of GB9407474D0 publication Critical patent/GB9407474D0/en
Publication of GB2277701A publication Critical patent/GB2277701A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • C21D8/0284—Application of a separating or insulating coating
    • 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
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/1283—Application of a separating or insulating coating

Landscapes

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

Abstract

An insulated coating is applied to an electrical steel during processing before the process of stretched tempering. The insulation is a mixture of complex resins with organic and inorganic chromates, phosphates and oxides.

Description

COATING OF STEELS This invention relates to the coating of steels, and particularly the coating of steels that are to be rolled. The processing of steels needs to be carried out as efficiently as possible and where steps can be combined it is often advantageous to be able to do so.
One particular application is for steel used is the construction of cores for rotating electrical machines eg. electric motors where a non-orientated low silicon steel is usually employed, with a thickness of 0.5mm to 3mm. The physical characteristics of this steel required by customers mean that the last stage of processing is a stretch tempering rolling which imparts an extension of between 1% and 12. The steel is usually annealed and commonly with the cut laminations stacked on top of one another. The stacks are often bead welded together before annealing. Because the annealing processes used by manufacturers are sometimes not as carefully controlled as might be the case there can be a tendency for the laminations to stick together during the annealing process.One method of overcoming this has been to impart a rough rolling to the steel during the stretch temper process but this is not entirely satisfactory because the rough surfaces have many points of micro contact between the laminations and therefore the power loss exhibited by the stack of laminations can be inconveniently high.
One alternative method would be to apply an insulating coating to the steel. Unfortunately this has traditionally meant a cleaning of the steel strip after the stretch tempering to remove the remnants of the rolling lubrication from the steel before the coating is applied. It is therefore an object of the present invention to provide a coating that can be successfully stretch tempered.
According to the present invention a process for producing rolled strip steel includes the steps of applying an insulating coating to the steel and subsequently applying a stretch temper rolling with an extension of between 1% and 12%.
The coating may be an organic/inorganic mixture of complex resins and chromates, phosphates and oxides.
The coating may be applied during a step proceeding the stretch tempering and may preferably be part of a strand annealing process.
The stretch tempering may include the use of an inhibited coolant and smooth rolls. The steel may have a surface roughness between CLA 1.5-2.6 m before coating.
The invention will now be described by way of example only. The electrical steel to be processed is a low silicon steel of between 0.5mm and 3mm thick. It is to be stretch tempered by between 1% and 12% as is commonly required by customers. The surface roughness of the steel strip to be processed is controlled in a known manner, to be between CLA 1.5 and 2.6 gm. The steel is to be strand annealed; that is, the annealing stage is to be carried out in a continuous process rather than in a batch process. Strand annealing machines commonly have the ability to apply a coating to the steel during such a process. A coating of a mixture of a complex resin with inorganic chromates, phosphates and oxides is used.
and is applied on the strand annealing machine as a stage subsequent to the strand annealing process proper and this coating is tolerant of the stretch tempering stage and will survive an extension of up to 12%. Obviously temper mill lubrication is still required, but the lubricant now does not create any disadvantage.

Claims (5)

1. A process for producing rolls strip steel including the steps of applying an insullating coating to the steel and subsequently applying a stetched temper rolling with an extention of between 1% and 12%.
2. A process as claimed in claim 1 in which the coating is a mixture of complex resins and inorganic chromates phosphates and oxides.
3. A process as claimed in any proceeding claim in which the coating is applied during the strand annealing process.
4. A process as claimed in any proceeding claim in which the stretch tempering process includes the use of an inhibited coolant and smooth rolls.
5. A process as claimed in any proceeding claim in which the steel has a surface roughness between CLA 1.5 and 2.6 gm before coating.
GB9407474A 1993-05-06 1994-04-15 Coating of steels Withdrawn GB2277701A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB939309338A GB9309338D0 (en) 1993-05-06 1993-05-06 Coating of steels

Publications (2)

Publication Number Publication Date
GB9407474D0 GB9407474D0 (en) 1994-06-08
GB2277701A true GB2277701A (en) 1994-11-09

Family

ID=10735033

Family Applications (2)

Application Number Title Priority Date Filing Date
GB939309338A Pending GB9309338D0 (en) 1993-05-06 1993-05-06 Coating of steels
GB9407474A Withdrawn GB2277701A (en) 1993-05-06 1994-04-15 Coating of steels

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB939309338A Pending GB9309338D0 (en) 1993-05-06 1993-05-06 Coating of steels

Country Status (1)

Country Link
GB (2) GB9309338D0 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1476895A (en) * 1974-04-25 1977-06-16 Nippon Steel Corp Method of producing grain oriented electromagnetic steel sheet
EP0072874A1 (en) * 1981-08-25 1983-03-02 Nippon Steel Corporation Dual-purpose plant for producing cold rolled steel sheet and hot-dip galvanized steel sheet
US4521265A (en) * 1981-11-20 1985-06-04 Mitsubishi Light Metal Industries Limited Process for preparing laminated plate
EP0143548A1 (en) * 1983-10-27 1985-06-05 Kawasaki Steel Corporation Grain-oriented silicon steel sheet having a low iron loss free from deterioration due to stress-relief annealing and a method of producing the same
US5174833A (en) * 1989-07-05 1992-12-29 Nippon Steel Corporation Production of grain-oriented silicon steel sheets having an insulating film formed thereon

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1476895A (en) * 1974-04-25 1977-06-16 Nippon Steel Corp Method of producing grain oriented electromagnetic steel sheet
EP0072874A1 (en) * 1981-08-25 1983-03-02 Nippon Steel Corporation Dual-purpose plant for producing cold rolled steel sheet and hot-dip galvanized steel sheet
US4521265A (en) * 1981-11-20 1985-06-04 Mitsubishi Light Metal Industries Limited Process for preparing laminated plate
EP0143548A1 (en) * 1983-10-27 1985-06-05 Kawasaki Steel Corporation Grain-oriented silicon steel sheet having a low iron loss free from deterioration due to stress-relief annealing and a method of producing the same
US5174833A (en) * 1989-07-05 1992-12-29 Nippon Steel Corporation Production of grain-oriented silicon steel sheets having an insulating film formed thereon

Also Published As

Publication number Publication date
GB9309338D0 (en) 1993-06-16
GB9407474D0 (en) 1994-06-08

Similar Documents

Publication Publication Date Title
US5911844A (en) Method for forming a metallic material
JPS61149433A (en) Method and apparatus for reducing iron loss in crystal grainorientation type silicon steel
EP0684320A1 (en) Process of making electrical steels
EP0372076A4 (en) Method of producing directional silicon steel sheet having excellent magnetic characteristics and continuous intermediate annealing equipment
GB2277701A (en) Coating of steels
KR101719452B1 (en) Surface treatment method of hot forging mold and the hot forging mold
JP2634991B2 (en) Manufacturing method of surface treated stainless steel sheet
JP2001286927A (en) Method of manufacturing hot-rolled steel plate
JPH10256066A (en) Winding core with improved iron loss characteristic and its manufacturing method
WO1998023398A1 (en) Manufacture of copper wire
US11702718B2 (en) Method of making magnetically soft intermediate product
KR100509618B1 (en) cool enamel steel plate manufacture method
JP2003034821A (en) Method for manufacturing grain-oriented electromagnetic steel sheet with high magnetic-flux density having no undercoat film
KR100237576B1 (en) Motor core
JPH044369B2 (en)
KR100928789B1 (en) Manufacturing method of steel plate for brushing of hearth roll and brushing method of hearth roll
KR940007368B1 (en) Method of manufacturing oriented electromagnetic steel plates
JP2562253B2 (en) Method for manufacturing low iron loss grain-oriented electrical steel sheet
JP4569104B2 (en) Helical machining core material with excellent magnetic properties, manufacturing method thereof, and helical machining stator core
CN116855699A (en) Machining method of 18Ni maraging steel part
JP2627083B2 (en) Method for producing low iron loss unidirectional silicon steel sheet
JPH11152516A (en) Manufacture of grain oriented silicon steel sheet
JPH03226522A (en) Production of nonoriented silicon steel sheet
US1933188A (en) Cold rolling coated strip
JPH0754154A (en) Production of grain-oriented silicon steel sheet having homogeneous forsterite film

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)