BE846022A - PROCESS FOR MANUFACTURING SHEET FOR STAMPING - Google Patents

PROCESS FOR MANUFACTURING SHEET FOR STAMPING

Info

Publication number
BE846022A
BE846022A BE6045669A BE6045669A BE846022A BE 846022 A BE846022 A BE 846022A BE 6045669 A BE6045669 A BE 6045669A BE 6045669 A BE6045669 A BE 6045669A BE 846022 A BE846022 A BE 846022A
Authority
BE
Belgium
Prior art keywords
sheet
temperature
stamping
sheets
heating
Prior art date
Application number
BE6045669A
Other languages
French (fr)
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 filed Critical
Priority to BE6045669A priority Critical patent/BE846022A/en
Publication of BE846022A publication Critical patent/BE846022A/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473Final recrystallisation annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length

Landscapes

  • 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 Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Description

       

  Procédé de fabrication de tôles pour emboutissage.

  
La présente invention est relative à un procédé pour fabriquer en continu des tôles laminées à froid présentant une grande aptitude à l'emboutissage et une grande homogénéité de propriétés sur toute leur largeur. De telles qualités sont spécialement requises pour les tôles utilisées dans l'industrie automobile.

  
Le procédé de l'invention est particulièrement intéressant en ce qu'il procure des tôles qui, en outre,

  
 <EMI ID=1.1> 

  
rupture élevée. 

  
Pour la fabrication des tôles pour emboutissage, on utilise normalement des aciers, calmés ou non, dont la teneur en carbone est comprise entre 0,03 et 0,12 %, la teneur en manganèse comprise entre 0,10 et 0,60 %, la teneur en phosphore inférieure à 0,04 % et celle des autres éléments la plus basse possible; le silicium est toutefois souvent toléré en teneur allant jusqu'à 0,15 % maximum, lorsque cet élément est utilisé comme seul désoxydant.

  
Ces conditions de composition sont pratiquement considérées comme indispensables pour assurer le propriétés mécaniques requises pour l'emboutissage; par contre, elles ne sont pas de nature à favoriser l'obtention de limite élastique ou de charge de rupture élevée.

  
D'un autre côté,- quand on veut obtenir de bonnes propriétés de ductilité, d'emboutissage et d'allongement avec des tôles en acier classique laminées à froid, on les soumet généralement à un recuit de recristallisation

  
en bobine, dans un four à cloche.

  
Toutefois, un tel traitement s'avère coûteux parce qu'il est long et partant de faible productivité; en outre, les résultats ainsi obtenus présentent une assez grande dispersion.

  
Pour remédier à ces divers inconvénients, on

  
a déjà préconisé de remplacer le traitement de recuit en bobine par un traitement thermiqué continu; malgré les nombreuses variantes proposées, il est cependant encore impossible d'obtenir à coup sur une homogénéité satisfaisante des propriétés de ces tôles sur toute leur largeur,

  
et une bonne ductilité, tout en gardant une durée de traitement acceptable.

  
De toute façon, ces traitements connus ne relèvent pas non plus la limite élastique ou la charge de rupture des tôles, en sorte que l'on doit encore s'efforcer

  
 <EMI ID=2.1>  La présente invention a pour* -objet un procédé

  
 <EMI ID=3.1>  Dans le but d'obtenir une recristallisation aussi complète que possible de la structure écrouie de la tôle laminée à froid, on peut maintenir la tôle à une température égale ou éventuellement intermédiaire aux températures de fin de chauffage et de début de refroidissement rapide, par exemple pendant un temps supérieur à 30 secondes.

  
Suivant l'invention, la tôle refroidie est avantageusement soumise ensuite à une opération de revenu

  
ou de survieillissement consistant à chauffer la dite tôle

  
à une température comprise entre 300[deg.]C et 500[deg.]C, ce qui permet d'augmenter la ductilité du métal; cette opération permet d'obtenir un produit présentant à la fois une charge de rupture importante et un rapport E/R élevé.

  
Egalement suivant l'invention, la tôle ame- <EMI ID=4.1> 

  
être maintenue à cette température, pendant une durée supérieure à 15 secondes. 

REVENDICATIONS

  
1. Procédé de fabrication de tôles pour emboutissage, comprenant une opération de chauffage de tôles laminées à froid, suivie d'une opération de refroidissement rapide, caractérisé en ce que l'on utilise un acier

  
 <EMI ID=5.1> 

  
de manganèse et du silicium en teneur comprise entre 0,01 % et 0,7 %, en ce que l'on réalise l'opération de refroidissement rapide en deux phases consécutives, dont la première consiste en une diminution de température du produit avec une vitesse comprise entre 30 et 125[deg.]C/sec., tandis que la deuxième consiste en un refroidissement brusquement accéléré, avec une vitesse comprise entre 200 et 750[deg.]C/sec.



  Manufacturing process of sheet metal for stamping.

  
The present invention relates to a process for the continuous manufacture of cold-rolled sheets exhibiting great ability to draw and great homogeneity of properties over their entire width. Such qualities are especially required for sheets used in the automotive industry.

  
The process of the invention is particularly advantageous in that it provides sheets which, in addition,

  
 <EMI ID = 1.1>

  
high breakage.

  
For the manufacture of sheets for stamping, steels, calmed or not, are normally used, the carbon content of which is between 0.03 and 0.12%, the manganese content between 0.10 and 0.60%, the phosphorus content of less than 0.04% and that of the other elements as low as possible; silicon is however often tolerated in a content of up to 0.15% maximum, when this element is used as the sole deoxidizer.

  
These compositional conditions are practically considered to be essential to ensure the mechanical properties required for stamping; on the other hand, they are not such as to favor obtaining an elastic limit or a high breaking load.

  
On the other hand, - when one wants to obtain good properties of ductility, drawing and elongation with conventional cold-rolled steel sheets, they are generally subjected to recrystallization annealing.

  
on a coil, in a bell oven.

  
However, such a treatment proves to be expensive because it is long and therefore of low productivity; in addition, the results thus obtained exhibit a fairly large dispersion.

  
To remedy these various drawbacks, we

  
has already recommended replacing the coil annealing treatment with continuous heat treatment; despite the many variants proposed, however, it is still impossible to suddenly obtain satisfactory homogeneity of the properties of these sheets over their entire width,

  
and good ductility, while maintaining an acceptable processing time.

  
In any case, these known treatments do not raise the elastic limit or the breaking load of the sheets either, so that one must still try

  
 <EMI ID = 2.1> The present invention has for * -object a method

  
 <EMI ID = 3.1> In order to obtain as complete a recrystallization as possible of the work-hardened structure of the cold-rolled sheet, the sheet can be maintained at a temperature equal or possibly intermediate to the end of heating and start temperatures rapid cooling, for example for a time greater than 30 seconds.

  
According to the invention, the cooled sheet is advantageously then subjected to a tempering operation.

  
or overaging consisting in heating said sheet

  
at a temperature between 300 [deg.] C and 500 [deg.] C, which makes it possible to increase the ductility of the metal; this operation makes it possible to obtain a product exhibiting both a high breaking load and a high W / R ratio.

  
Also according to the invention, the core sheet <EMI ID = 4.1>

  
be maintained at this temperature for a period of more than 15 seconds.

CLAIMS

  
1. A method of manufacturing sheets for stamping, comprising an operation of heating cold-rolled sheets, followed by a rapid cooling operation, characterized in that a steel is used.

  
 <EMI ID = 5.1>

  
manganese and silicon in a content between 0.01% and 0.7%, in that the rapid cooling operation is carried out in two consecutive phases, the first of which consists of a decrease in the temperature of the product with a speed between 30 and 125 [deg.] C / sec., while the second consists of abruptly accelerated cooling, with a speed between 200 and 750 [deg.] C / sec.


    

Claims (1)

2. Procédé suivant la revendication 1, caractérisé en ce que l'on utilise un acier dont la teneur en phosphore est comprise entre 0,03 % et 0,1 %. 2. Method according to claim 1, characterized in that one uses a steel whose phosphorus content is between 0.03% and 0.1%. 3. Procédé suivant l'une ou l'autre des revendications 1 et 2, caractérisé en ce que l'on utilise un acier contenant jusqu'à 0,02 % de bore. 3. Method according to either of claims 1 and 2, characterized in that one uses a steel containing up to 0.02% boron. 4. Procédé suivant l'une ou l'autre des revendications 1 à 3, caractérisé en ce que l'on maintient 4. Method according to one or the other of claims 1 to 3, characterized in that one maintains la tôle à une température égale ou éventuellement intermédiaire aux températures de fin de chauffage et de début the sheet at a temperature equal or possibly intermediate to the end of heating and start temperatures du refroidissement rapide, pendant un temps supérieur à rapid cooling, for a time greater than 30 secondes. 30 seconds. 5. Procédé suivant l'une ou l'autre des revendications 1 à 4, caractérisé en ce que la tôle refroidie est soumise à une opération de revenu ou de survieillissement consistant à chauffer la dite tôle à une tempéra- ture comprise entre 300[deg.]C et 500[deg.]C. 5. A method according to either of claims 1 to 4, characterized in that the cooled sheet is subjected to a tempering or overaging operation consisting in heating said sheet to a temperature between 300 [deg. .] C and 500 [deg.] C. 6. Procédé suivant la revendication 5, caractérisé en ce que la tôle traitée à une température comprise entre 300[deg.]C et 500[deg.]C est maintenue à cette température pendant une durée supérieure à 15 secondes. 6. Method according to claim 5, characterized in that the sheet treated at a temperature between 300 [deg.] C and 500 [deg.] C is maintained at this temperature for a period of more than 15 seconds.
BE6045669A 1976-09-09 1976-09-09 PROCESS FOR MANUFACTURING SHEET FOR STAMPING BE846022A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE6045669A BE846022A (en) 1976-09-09 1976-09-09 PROCESS FOR MANUFACTURING SHEET FOR STAMPING

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE846022 1976-09-09
BE6045669A BE846022A (en) 1976-09-09 1976-09-09 PROCESS FOR MANUFACTURING SHEET FOR STAMPING

Publications (1)

Publication Number Publication Date
BE846022A true BE846022A (en) 1977-03-09

Family

ID=25657996

Family Applications (1)

Application Number Title Priority Date Filing Date
BE6045669A BE846022A (en) 1976-09-09 1976-09-09 PROCESS FOR MANUFACTURING SHEET FOR STAMPING

Country Status (1)

Country Link
BE (1) BE846022A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2447969A1 (en) * 1979-02-02 1980-08-29 Nippon Steel Corp METHOD FOR MANUFACTURING COLD ROLLED STEEL STRIPS WITH DEEP STAMPING BY SHORT-TERM CONTINUOUS ANNEALING
FR2472022A1 (en) * 1979-12-15 1981-06-26 Nippon Steel Corp PROCESS FOR THE PRODUCTION OF A TWO PHASE LAMINATED STEEL SHEET WHICH IS FORMED BY RAPID COOLING AFTER A CONTINUOUS NOISE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2447969A1 (en) * 1979-02-02 1980-08-29 Nippon Steel Corp METHOD FOR MANUFACTURING COLD ROLLED STEEL STRIPS WITH DEEP STAMPING BY SHORT-TERM CONTINUOUS ANNEALING
FR2472022A1 (en) * 1979-12-15 1981-06-26 Nippon Steel Corp PROCESS FOR THE PRODUCTION OF A TWO PHASE LAMINATED STEEL SHEET WHICH IS FORMED BY RAPID COOLING AFTER A CONTINUOUS NOISE

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: CENTRE DE RECHERCHES METALLURGIQUES - CENTRUM VOO

Effective date: 19900930