EP0090749A1 - Verfahren zum Abkühlen mit niedriger Deformation von metallurgischen Gegenständen - Google Patents

Verfahren zum Abkühlen mit niedriger Deformation von metallurgischen Gegenständen Download PDF

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Publication number
EP0090749A1
EP0090749A1 EP83420053A EP83420053A EP0090749A1 EP 0090749 A1 EP0090749 A1 EP 0090749A1 EP 83420053 A EP83420053 A EP 83420053A EP 83420053 A EP83420053 A EP 83420053A EP 0090749 A1 EP0090749 A1 EP 0090749A1
Authority
EP
European Patent Office
Prior art keywords
product
cooling
spraying
less
nozzles
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
EP83420053A
Other languages
English (en)
French (fr)
Other versions
EP0090749B1 (de
Inventor
Jean Bouvaist
Bruno Dubost
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.)
Cegedur Societe de Transformation de lAluminium Pechiney SA
Original Assignee
Aluminium Pechiney SA
Cegedur Societe de Transformation de lAluminium Pechiney SA
Societe de Vente de lAluminium Pechiney SA
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 Aluminium Pechiney SA, Cegedur Societe de Transformation de lAluminium Pechiney SA, Societe de Vente de lAluminium Pechiney SA filed Critical Aluminium Pechiney SA
Priority to AT83420053T priority Critical patent/ATE21268T1/de
Publication of EP0090749A1 publication Critical patent/EP0090749A1/de
Application granted granted Critical
Publication of EP0090749B1 publication Critical patent/EP0090749B1/de
Expired legal-status Critical Current

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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
    • 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
    • C21D1/62—Quenching devices
    • 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
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching

Definitions

  • This invention relates to an economical method of cooling metallurgical products which minimizes deformations thereof, while preserving their properties of use.
  • the cooling of metallurgical products is involved in a large number of operations such as casting and solidification, after hot transformation on various tools (rolling mills, spinning presses, etc.) or even in the case of metallurgical quenching.
  • Pneumatic spraying has the disadvantage of being expensive because of the price of the nozzles (ten times higher than that of mechanical nozzles) and the high cost of investment and operation of air compressors. In addition, this system is dangerous because of the risk of bursting of the compressed air lines and is excessively noisy.
  • the method according to the invention which eliminates, or at least minimizes these distortions, consists in cooling the metallurgical product with a different cooling mode between approximately two adjacent halves of its outer surface, each of them extending in the direction long or the main plan of the product, when it (s) exist (s).
  • the cooling fluid generally used consists essentially of water, possibly supplemented with certain additives (anti-corrosion, anti-foaming agent, etc.).
  • the coating can be carried out at any stage of the production range, prior to cooling provided that the latter remains adherent and retains its effectiveness during the range (for example, the product can be coated before heating in solution). which precedes quenching).
  • the watering be done through the lower part of the products, the long direction thereof being substantially horizontal.
  • the process applies mainly, but not exclusively to long metallic products (wires, bars, tubes, profiles) or flat (strips, sheets, flats) of relatively small transverse dimensions and substantially constant thicknesses.
  • the thickness of the flat products is preferably less than or equal to 15 mm (which corresponds substantially to a diameter of 30 mm for a solid round bar).
  • the thickness is preferably less than or equal to 35 mm (or to a diameter of approximately 70 mm).
  • the thickness is preferably less than or equal to 8 mm (or to a diameter of about 15 mm).
  • the method is particularly applicable to the quenching of high strength Al alloys for which the characteristics of use (mechanical and / or corrosion resistance) are practically not modified compared to conventional quenching with, however, very small deformations.
  • the surface water challenges remain below 2000 1m -2 min. -1 and preferably 800 1m -2 min. -1 ; the nozzles are placed at a distance of less than 15 cm from the product surface, and the injection pressure is less than 1.5 MPa (15 bars) and preferably 1 MPa (10 bars).
  • Figure 1 shows an end view of products (1) provided with an insulating coating (2), on about half of their outer surface and cooled using spray nozzles (3), or by immersion in a cooling medium (4) contained in the tank (5).
  • FIG. 2 represents the characteristics of deformation after cooling: deflection (f) and tile (t) of a rectangular flat product, initially planar.
  • Three dimension plates 400 x 400 x 10 mm aluminum alloy (7075) were quenched by vertical immersion in cold water (20 ° C) or hot (60 ° C) after dissolving for 4 hours at 470 ° C in a ventilated air oven.
  • Table I below gives the quenching speeds measured between 400 and 250 ° C at 1.5 mm under each surface by means of thermocouples placed in the center of the large faces of the sheets as well as the macroscopic deformations measured after quenching (maximum arrow the along the horizontal axis - maximum tile along the vertical axis of the sheets) and the mechanical longitudinal tensile characteristics at mid-thickness in the center of the sheets, measured after tempering in the T6 state (24 h at 120 ° C ).
  • the sheet (C) quenched according to the invention by asymmetric cooling is endowed with both mechanical tensile characteristics equivalent to those of the sheets most rapidly quenched symmetrically in cold water (practical significantly lower than the other sheets including the sheet (B) quenched symmetrically with relatively slow cooling rates.
  • Spraying was provided over the entire lower horizontal surface of the sheets by adjacent jets with solid cone jets, with an angle of about 60 °, delivering a surface flow of 145 1 / min.m 2 under a pressure of 3 bars (0, 3 MPa).
  • Table II below gives the deformations of the sheets after quenching, the surface electrical conductivity of the sheets five days after quenching (which is all the lower in the quenched-ripened state as the quenching is faster), the speed of medium cooling sheets in the critical quenching interval (400 - 250 ° C) and the mechanical characteristics on tensile test pieces treated by tempering - T76 (6 h at 107 ° C + 16 h at 160 ° C) after pickling coating and controlled traction of sheets before tempering
  • the quenched sheets according to the invention have significantly lower residual deformations than those obtained by symmetrical quenching, while retaining substantially equal mechanical properties and although the surface flow rates used here are relatively low.
  • the quenching installation included a 700 mm long quenching window, made up of spraying booms located on either side of a carriage intended to support and translate the sheets with a modular passage speed, so as to simulate the horizontal quenching at the outlet of the passage oven.
  • Spray nozzles consisted of cone sprayers full, 60 ° angle, supplied with a flow of water at 15 ° C pressurized to 6.5 bars.
  • a sheet was quenched by symmetrical pulverization on the two uncoated faces, according to usual practice.
  • the other sheets were quenched by horizontal unilateral spraying on the underside with the same surface flow with coating of the surface to be sprayed with an insulating coating based on sodium silicate.
  • Table III gives the test conditions, the average cooling rates measured between 400 and 250 ° C. by thermocouples in the center of the sheets, the deformations of the sheets after quenching (longitudinal deflection - transverse tile) as well as the sensitivity to intergranular corrosion of the hardened sheets and stripped of the coating evaluated according to the immersion test in solution of sodium chloride and distilled water according to standard AIR 9048.
  • the asymmetrical quenching of the coated sheet metal according to the invention improves both the quenching rates (x 2 approximately) and the resistance to intergranular corrosion of the alloy as well as the flatness of the sheets while increasing the productivity of the installation (x 3) and reducing the necessary water consumption (: 2 approximately) compared to the symmetrical quenching of bare sheets.
  • the nozzles gave jets with a full cone, angle 60 °, with a surface flow of 580 l / min / m2 under a water pressure of 6 bars (0.6 MPa).
  • Table IV gives the test conditions as well as the cooling rates and the average longitudinal deformations (arrows) after quenching.
  • the results show that the angle iron quenched by one-sided spraying on the coated surface according to the invention has a better compromise between cooling speed and straightness than the angle angles cooled by conventional symmetrical cooling by spraying on the runway or by immersion.
  • the coating and the unilateral quenching significantly increase the productivity (x 3) with acceptable quenching deformations.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
  • Control Of Heat Treatment Processes (AREA)
EP83420053A 1982-03-25 1983-03-24 Verfahren zum Abkühlen mit niedriger Deformation von metallurgischen Gegenständen Expired EP0090749B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83420053T ATE21268T1 (de) 1982-03-25 1983-03-24 Verfahren zum abkuehlen mit niedriger deformation von metallurgischen gegenstaenden.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8205682A FR2524001B1 (fr) 1982-03-25 1982-03-25 Procede de refroidissement minimisant les deformation s des produits metallurgiques
FR8205682 1982-03-25

Publications (2)

Publication Number Publication Date
EP0090749A1 true EP0090749A1 (de) 1983-10-05
EP0090749B1 EP0090749B1 (de) 1986-08-06

Family

ID=9272663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83420053A Expired EP0090749B1 (de) 1982-03-25 1983-03-24 Verfahren zum Abkühlen mit niedriger Deformation von metallurgischen Gegenständen

Country Status (5)

Country Link
EP (1) EP0090749B1 (de)
AT (1) ATE21268T1 (de)
DE (1) DE3365078D1 (de)
ES (1) ES8402356A1 (de)
FR (1) FR2524001B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0213333A2 (de) * 1985-08-19 1987-03-11 VEB Kombinat Forsttechnik Waren Verfahren und Einrichtung zum Härten von Stahlblechen
EP0307386A1 (de) * 1987-08-31 1989-03-15 BÖHLER Gesellschaft m.b.H. Verfahren zur Herstellung einer Titanlegierung und Verwendung einer Sprüheinrichtung zur Durchführung des Verfahrens
FR2680522A1 (fr) * 1991-08-21 1993-02-26 Snecma Procede de traitement thermique de pieces en superalliages avec mise en place d'une barriere thermique avant trempe.
CN100415902C (zh) * 2006-08-03 2008-09-03 上海交通大学 采用碳分配提高钢件表面硬度的方法
CN104998906A (zh) * 2015-06-17 2015-10-28 铜陵市大明玛钢有限责任公司 锻钢冷轧辊的表面清洗方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2848480B1 (fr) 2002-12-17 2005-01-21 Pechiney Rhenalu Procede de fabrication d'elements structuraux par usinage de toles epaisses
RU2735698C1 (ru) * 2019-10-10 2020-11-06 Виктор Леонидович Князьков Способ электродугового упрочнения стальных изделий

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR698201A (fr) * 1930-06-30 1931-01-28 Berliner Hartepulver Ges M B H Couche protectrice pour enrober des points déterminés de métaux à tremper
FR706652A (fr) * 1929-12-18 1931-06-27 Fried Krupp Ag Friedrich Alfre Procédé et appareil pour le traitement thermique de profilés après le laminage
DE955042C (de) * 1953-08-02 1956-12-27 Friedrichshuette Ag Verfahren und Vorrichtung zum Abkuehlen von warmgewalztem, flachem Walzgut
FR2004251A1 (de) * 1968-03-19 1969-11-21 Yawata Iron & Steel Co
FR2232602A1 (de) * 1973-06-08 1975-01-03 Nippon Kokan Kk
FR2286880A1 (fr) * 1974-10-02 1976-04-30 Roechling Burbach Gmbh Stahl Procede pour le refroidissement de profiles lamines

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE648850A (de) * 1963-06-04
FR1430702A (fr) * 1964-04-22 1966-03-04 United Eng Foundry Co Procédé et appareil pour le refroidissement de produits

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR706652A (fr) * 1929-12-18 1931-06-27 Fried Krupp Ag Friedrich Alfre Procédé et appareil pour le traitement thermique de profilés après le laminage
FR698201A (fr) * 1930-06-30 1931-01-28 Berliner Hartepulver Ges M B H Couche protectrice pour enrober des points déterminés de métaux à tremper
DE955042C (de) * 1953-08-02 1956-12-27 Friedrichshuette Ag Verfahren und Vorrichtung zum Abkuehlen von warmgewalztem, flachem Walzgut
FR2004251A1 (de) * 1968-03-19 1969-11-21 Yawata Iron & Steel Co
FR2232602A1 (de) * 1973-06-08 1975-01-03 Nippon Kokan Kk
FR2286880A1 (fr) * 1974-10-02 1976-04-30 Roechling Burbach Gmbh Stahl Procede pour le refroidissement de profiles lamines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0213333A2 (de) * 1985-08-19 1987-03-11 VEB Kombinat Forsttechnik Waren Verfahren und Einrichtung zum Härten von Stahlblechen
EP0213333A3 (de) * 1985-08-19 1989-05-03 VEB Kombinat Forsttechnik Waren Verfahren und Einrichtung zum Härten von Stahlblechen
EP0307386A1 (de) * 1987-08-31 1989-03-15 BÖHLER Gesellschaft m.b.H. Verfahren zur Herstellung einer Titanlegierung und Verwendung einer Sprüheinrichtung zur Durchführung des Verfahrens
FR2680522A1 (fr) * 1991-08-21 1993-02-26 Snecma Procede de traitement thermique de pieces en superalliages avec mise en place d'une barriere thermique avant trempe.
CN100415902C (zh) * 2006-08-03 2008-09-03 上海交通大学 采用碳分配提高钢件表面硬度的方法
CN104998906A (zh) * 2015-06-17 2015-10-28 铜陵市大明玛钢有限责任公司 锻钢冷轧辊的表面清洗方法

Also Published As

Publication number Publication date
ES520920A0 (es) 1984-01-16
ATE21268T1 (de) 1986-08-15
ES8402356A1 (es) 1984-01-16
FR2524001A1 (fr) 1983-09-30
DE3365078D1 (en) 1986-09-11
FR2524001B1 (fr) 1987-02-20
EP0090749B1 (de) 1986-08-06

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