US3775180A - Method for descaling steel - Google Patents

Method for descaling steel Download PDF

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Publication number
US3775180A
US3775180A US3775180DA US3775180A US 3775180 A US3775180 A US 3775180A US 3775180D A US3775180D A US 3775180DA US 3775180 A US3775180 A US 3775180A
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Prior art keywords
method
steel
descaling
solid
process
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Expired - Lifetime
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M Hirata
K Kunioka
T Shimotsuma
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JFE Engineering Corp
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JFE Engineering Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/086Descaling; Removing coating films
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00Selection of abrasive materials or additives for abrasive blasts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0084Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a mixture of liquid and gas

Abstract

Steel is descaled by spraying a mixture of a solid such as aluminum oxide and silicon carbide, water and a gas such as air under specified conditions onto the steel.

Description

Hirata et al.

[ Nov. 27, 1973 METHOD FOR DESCALING STEEL Inventors: Masaru Hirata, 1500-55, Fukuoka cho, lruma gun, Saitama ken; Kazuo Kunioka; Teruo Shimotsuma, both of c/o Gijutsu Kenkyusho, Nippon Kokan Kabushiki Kaisha; Shigenari Shimizu, c/o Keihin Seitetsusho, Nippon Kokan Kabushiki Kaisha, Kawasaki, all of Japan Filed: Aug. 22, 1972 Appl. No.: 282,831

Related US. Application Data Continuation-impart of Ser. No. 95,855, Dec. 7, 1970, abandoned.

Foreign Application Priority Data [56] References Cited UNITED STATES PATENTS 2,380,738 7/1945 Eppler 51/321 x 3,149,445 9/1964 Nolan 3,447,272 6/1969 Eppler 2,817,195 12/1957 Curtin.... 2,858,653 11/1958 Guptill 2,605,596 8/1952 Uhri 134/7 UX Primary Examiner-Joseph Scovronek Assistant Examiner-T. W. Hagan Attorney-Robert D. Flynn et al.

[57] ABSTRACT Steel is descaled by spraying a mixture of a solid such as aluminum oxide and silicon'carbide, water and a gas such as air under specified conditions onto the Dec. 8, 1969 Japan 44/98175 steel.

us. 01 134/7, 15/321, 134/17 3 Claims 3 Drawing 1111.121. 1321b 45/00, B24c 1/00 Field of Search 134/7, 16, 17; 51/319, 321

METHOD FOR DESCALING STEEL RELATED APPLICATION This application is a continuation-in-part of application Ser. No. 95,855, filed Dec. 7, 1970, which application has been abandoned.

The present invention relates to a method for cooling and descaling steel sheets simultaneously and highly efficiently.

It is a main object of the present invention to provide a process of spraying a mixture of liquid and solid in gas under pressure onto a surface of a billet.

Of prior known methods for descaling steel sheets,

1 there is a method wherein a descaling process is conducted during a rolling process, and a method wherein a descaling process is conducted out of a rolling line. For instance, there are methods such as one wherein descaling is conducted by spraying high pressure water of approximately 100 kg/cm through a nozzle at the high temperature stage during a rolling process; a method of eliminating scale by providing grooves on a surface of a roll, and a method wherein an edger is arranged in front of a mill, scale on the surface being floated up by reduction of said edger said scale being blown away with high pressure water. On the other hand, as for methods conducted out of a rolling line, shot blasting or sand blasting have been used.

Adescaling method wherein grooves are provided on a surface of a roll, descaling beingconducted during the process of rolling, presents problems on the surface of steel sheets, and requires high installment cost. A

method of descaling by arranging an edger in front of a mill also involves a high installment cost. Accordingly, said methods are rarely applied.

At present, the principal method used is one wherein scale is blown away with high pressure water. Said method, however, not only requires a large amount of high pressure water, but also is disadvantageous in that descaling cannot always be performed sufficiently.

On the other hand, such methods as sand blasting and shot blasting conducted out of a rolling line have operational and sanitation problems, so that improvement and development thereof are greatly demanded.

The present invention aims to obviate such drawbacks as aforementioned.

The present invention is described in greater detail with reference being made to the accompanying drawings in which:

FIGS. 1 and 2 show a process of admixing vapor, liquid and solid, respectively; and

FIG. 3 shows an embodiment of a jet nozzle em ployed in the present invention.

FIGS. 1 and 2 illustrate one example of a process of admixing a solid, liquid (water) and gas (e.g. air) according to the novel method of the present invention. 1 denotes a mixing tank of solid and liquid, 2 a high pressure surging tank for mixed solution of solid and liquid, 3 a tank for solid powder, 4 a nozzle, and 5 a bi]- let, respectively. In accordance with the process-illustrated in FIG. 1, solid powder 6 and liquid 7 are put into said admixing tank 1, high pressure gas 8 (e.g. air) being added to said surging tank 2, said solid powder and liquid being carried as a mixed solution to a nozzle 4 to be mixed with high pressure gas 9. The resulting mixture is then jetted to a steel sheet 5 through said nozzle.

In accordance with the process illustrated in FIG. 2, solid powder 10 is carried from a tank 3 to a nozzle 4 with high pressure gas 11 and 12, high pressure water 13 being added thereto, to be jetted against a steel sheet 5.

An embodiment of a nozzle in FIGS. 1 and 2 is illustrated in FIG. 3. Subsequent treatments are conducted in order to jet a mixture of solid, liquid and gas in accordance with the process shown in FIG. 1; for example, high pressure gas 9 is carried into a nozzle from A, mixed solution of solid and liquid from B, respectively, said gas and solution being admixed at a position of area C and the resulting mixture being jetted through a nozzle opening 14.

In accordance with the process illustrated in FIG. 2, a mixture of high pressure gas and solid powder is carried from A, and liquid 13 from B, respectively, to be mixed at a position of area C in the same manner as in the former process, said mixture being jetted to a steel sheet. When jetted, it is required to use a nozzle of Laval type or simple drawing type, of which part drawn 15 is drawn as smoothly and gradually as possible, so that solid and liquid will obtain a velocity as high as that of vapor flow.

Jet conditions of descaling steel sheet in accordance with the present invention are as follows:

1. A flow velocity when a mixed jet of solid, liquid and gas comes into collision with a steel sheet should exceed 30 m/sec.;

2. As a solid used, Alundum powder (aluminum oxide) or Carborundum powder (silicon carbide) having a diameter of less than 0.5 mm should be employed;

3. A flow ratio of liquid to gas is preferably 1.0:1 to

5.0:1 by weight;

4. A flow ratio of solid to gas is preferably equivalent to 50:1 to 15:1 by weight.

EXAMPLE 1 A steel sheet before a rolling process was maintained at a high temperature (approximately l,200C) and a mixture of solid, liquid (water) and gas was jetted to said steel sheet for the purpose of descaling under the foregoing conditions.

As a result, excellent descaling was obtained by use of only a small amount of water and the cooling effect was excellent, thereby resulting in a remarkable decrease in disfigurement by rolling, and the improvement of properties of the steel.

EXAMPLE 2 While a steel sheet after rolling was maintained at a low to medium temperature (ranging from 300 to 600C), the novel method of the present invention was conducted. As a result, it was proved that inspection of a steel sheet to detect the surface flaws thereof can be done easily in addition to the effect shown in Example I. A great improvement in operational efficiency can be obtained.

As is clear from the foregoing, various effects can be expected when the process for descaling a steel sheet in accordance with the present invention is employed. As described by way of the foregoing examples, it is possible to descale with high efficiency a steel sheet maintained at high temperatures before or after a rolling operation. Further, the inspection of steel sheet to detect the surface flaws thereof can be performed easily In addition, an excellent cooling effect is obtained Improvement in steel properties is realized. Moreover, it is possible to apply the novel method of the present invention as a descaling process at normal temperature out of a rolling process in lieu of a shot blasting or a sand blasting process. In this case, excellent operational and sanitation effects can be obtained. Furthermore, the novel method of the present invention can be applied in such diverse uses as blast cleaning, cleaning for preliminary treatment such as plating, enamelling and the like, sand strip of moulding, strip of skin, scale, rust, coating agent and the like of a forging billet.

What is claimed is:

l. A method for descaling steel comprising forming a mixture of aluminum powder or silicon carbide powder having a diameter of less than 0.5 mm., air and water, and spraying the mixture onto a steel at a flow velocity in excess of 30 m/sec., the weight flow ratio of water to air being from 1:1 to 5:1 and the weight flow ratio of said powder to air being from 5:1 to 15: 1.

2. The method of claim 1, wherein the powder is aluminum oxide.

3. The method of claim 1, wherein the powder is silicon carbide.

Claims (2)

  1. 2. The method of claim 1, wherein the powder is aluminum oxide.
  2. 3. The method of claim 1, wherein the powder is silicon carbide.
US3775180A 1969-12-08 1972-08-22 Method for descaling steel Expired - Lifetime US3775180A (en)

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JP9817569 1969-12-08

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DE (1) DE2060419A1 (en)
FR (1) FR2073067A5 (en)
GB (1) GB1277830A (en)
NL (1) NL7017852A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251956A (en) * 1978-01-18 1981-02-24 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for descaling metal strip
US4289541A (en) * 1975-09-25 1981-09-15 Vereinigte Oesterreichische Eisen-Und Sthl-Werke Alpine Montan Akteingesellschaft Process of cleaning an austenitic steel surface
US4511124A (en) * 1983-05-03 1985-04-16 Lone Star Steel Company Method and composition for fluidization of accumulated pit scrap in soaking pits
DE3690756C2 (en) * 1986-07-30 1990-07-26 Cherepovets Volog Politekh I Apparatus for descaling flat steel
WO1993018863A1 (en) * 1992-03-20 1993-09-30 Church & Dwight Company, Inc. Abrasive coating remover and process for using same
US5598730A (en) * 1994-08-30 1997-02-04 Snap-On Technologies, Inc. Pre-forge aluminum oxide blasting of forging billets as a scale resistance treatment
US6025536A (en) * 1997-08-20 2000-02-15 Bristol-Myers Squibb Company Process of manufacturing a cobalt-chromium orthopaedic implant without covering defects in the surface of the implant
US20080108281A1 (en) * 2006-09-14 2008-05-08 The Material Works, Ltd. Slurry Blasting Apparatus for Removing Scale from Sheet Metal
US20080182486A1 (en) * 2006-09-14 2008-07-31 The Material Works, Ltd. Slurry Blasting Apparatus for Removing Scale From Sheet Metal
US20080220234A1 (en) * 2005-04-07 2008-09-11 Snt Co., Ltd Method of Preparing Wear-Resistant Coating Layer Comprising Metal Matrix Composite and Coating Layer Prepared Thereby
CN100531947C (en) 2007-06-15 2009-08-26 中国第一重型机械集团公司;一重集团大连设计研究院 Process of high-pressure air-flow scale removal
US20090227184A1 (en) * 2006-09-14 2009-09-10 The Material Works, Ltd. Method of Producing Rust Inhibitive Sheet Metal Through Scale Removal with a Slurry Blasting Descaling Cell
US20110009034A1 (en) * 2006-09-14 2011-01-13 The Material Works, Ltd. Method of Producing Rust Inhibitive Sheet Metal Through Scale Removal with a Slurry Blasting Descaling Cell Having Improved Grit Flow
US20110130075A1 (en) * 2006-09-14 2011-06-02 The Material Works, Ltd. Method of Producing Rust Inhibitive Sheet Metal Through Scale Removal with a Slurry Blasting Descaling Cell Having Improved Grit Flow

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2438507B1 (en) * 1978-10-13 1981-05-22 Safian Matvei
JPH0340645B2 (en) * 1984-05-30 1991-06-19
CN106180220A (en) * 2015-04-30 2016-12-07 宝山钢铁股份有限公司 Three-phase mixed jet flow centrifugal throw-jet type surface treatment method and device for metal plate and strip

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2380738A (en) * 1940-07-29 1945-07-31 Arthur H Eppler Art of sandblasting
US2605596A (en) * 1949-11-10 1952-08-05 William C Uhri Method of cleaning surfaces
US2817195A (en) * 1956-01-24 1957-12-24 Leo P Curtin Cleaning metal surfaces
US2858653A (en) * 1956-02-17 1958-11-04 Texas Co Abrading objects
US3149445A (en) * 1959-09-25 1964-09-22 Owens Illinois Glass Co Surface finishing and treating method
US3447272A (en) * 1965-03-12 1969-06-03 Arthur H Eppler Method for wet abrasive blasting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2380738A (en) * 1940-07-29 1945-07-31 Arthur H Eppler Art of sandblasting
US2605596A (en) * 1949-11-10 1952-08-05 William C Uhri Method of cleaning surfaces
US2817195A (en) * 1956-01-24 1957-12-24 Leo P Curtin Cleaning metal surfaces
US2858653A (en) * 1956-02-17 1958-11-04 Texas Co Abrading objects
US3149445A (en) * 1959-09-25 1964-09-22 Owens Illinois Glass Co Surface finishing and treating method
US3447272A (en) * 1965-03-12 1969-06-03 Arthur H Eppler Method for wet abrasive blasting

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289541A (en) * 1975-09-25 1981-09-15 Vereinigte Oesterreichische Eisen-Und Sthl-Werke Alpine Montan Akteingesellschaft Process of cleaning an austenitic steel surface
US4251956A (en) * 1978-01-18 1981-02-24 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for descaling metal strip
US4511124A (en) * 1983-05-03 1985-04-16 Lone Star Steel Company Method and composition for fluidization of accumulated pit scrap in soaking pits
DE3690756C2 (en) * 1986-07-30 1990-07-26 Cherepovets Volog Politekh I Apparatus for descaling flat steel
WO1993018863A1 (en) * 1992-03-20 1993-09-30 Church & Dwight Company, Inc. Abrasive coating remover and process for using same
US5439493A (en) * 1992-03-20 1995-08-08 Church & Dwight Co., Inc. Abrasive coating remover and process for using same
US5505749A (en) * 1992-03-20 1996-04-09 Church & Dwight Co., Inc. Abrasive coating remover
US5509971A (en) * 1992-03-20 1996-04-23 Church & Dwight Co., Inc. Process for removing coatings from hard surfaces
US5598730A (en) * 1994-08-30 1997-02-04 Snap-On Technologies, Inc. Pre-forge aluminum oxide blasting of forging billets as a scale resistance treatment
US6025536A (en) * 1997-08-20 2000-02-15 Bristol-Myers Squibb Company Process of manufacturing a cobalt-chromium orthopaedic implant without covering defects in the surface of the implant
US20080220234A1 (en) * 2005-04-07 2008-09-11 Snt Co., Ltd Method of Preparing Wear-Resistant Coating Layer Comprising Metal Matrix Composite and Coating Layer Prepared Thereby
US8486496B2 (en) * 2005-04-07 2013-07-16 SCK Solmics Co., Ltd. Method of preparing wear-resistant coating layer comprising metal matrix composite and coating layer prepared thereby
US20080108281A1 (en) * 2006-09-14 2008-05-08 The Material Works, Ltd. Slurry Blasting Apparatus for Removing Scale from Sheet Metal
US8066549B2 (en) 2006-09-14 2011-11-29 The Material Works, Ltd. Method of producing rust inhibitive sheet metal through scale removal with a slurry blasting descaling cell having improved grit flow
US20090227184A1 (en) * 2006-09-14 2009-09-10 The Material Works, Ltd. Method of Producing Rust Inhibitive Sheet Metal Through Scale Removal with a Slurry Blasting Descaling Cell
US7601226B2 (en) 2006-09-14 2009-10-13 The Material Works, Ltd. Slurry blasting apparatus for removing scale from sheet metal
US20110009034A1 (en) * 2006-09-14 2011-01-13 The Material Works, Ltd. Method of Producing Rust Inhibitive Sheet Metal Through Scale Removal with a Slurry Blasting Descaling Cell Having Improved Grit Flow
US20110130075A1 (en) * 2006-09-14 2011-06-02 The Material Works, Ltd. Method of Producing Rust Inhibitive Sheet Metal Through Scale Removal with a Slurry Blasting Descaling Cell Having Improved Grit Flow
US8062095B2 (en) 2006-09-14 2011-11-22 The Material Works, Ltd. Method of producing rust inhibitive sheet metal through scale removal with a slurry blasting descaling cell having improved grit flow
US8074331B2 (en) 2006-09-14 2011-12-13 The Material Works, Ltd. Slurry blasting apparatus for removing scale from sheet metal
US8128460B2 (en) 2006-09-14 2012-03-06 The Material Works, Ltd. Method of producing rust inhibitive sheet metal through scale removal with a slurry blasting descaling cell
US20080182486A1 (en) * 2006-09-14 2008-07-31 The Material Works, Ltd. Slurry Blasting Apparatus for Removing Scale From Sheet Metal
CN100531947C (en) 2007-06-15 2009-08-26 中国第一重型机械集团公司;一重集团大连设计研究院 Process of high-pressure air-flow scale removal

Also Published As

Publication number Publication date Type
DE2060419A1 (en) 1971-12-23 application
FR2073067A5 (en) 1971-09-24 application
NL7017852A (en) 1971-06-10 application
GB1277830A (en) 1972-06-14 application

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