EP0132252A1 - Procédé de fabrication de fil machine à bonne déformabilité à froid - Google Patents

Procédé de fabrication de fil machine à bonne déformabilité à froid Download PDF

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Publication number
EP0132252A1
EP0132252A1 EP19840890127 EP84890127A EP0132252A1 EP 0132252 A1 EP0132252 A1 EP 0132252A1 EP 19840890127 EP19840890127 EP 19840890127 EP 84890127 A EP84890127 A EP 84890127A EP 0132252 A1 EP0132252 A1 EP 0132252A1
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EP
European Patent Office
Prior art keywords
weight
temperature
wire
wire rod
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
EP19840890127
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German (de)
English (en)
Other versions
EP0132252B1 (fr
Inventor
Herbert Adolf Dipl.-Ing. Schifferl
Norbert Dipl.-Ing. Köck
Harald Dipl.-Ing. Brandl
Karl Dipl.-Ing. Eggerth
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.)
Voestalpine Stahl Donawitz GmbH
Original Assignee
Voestalpine AG
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Publication date
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Application filed by Voestalpine AG filed Critical Voestalpine AG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires

Definitions

  • the invention relates to a method for producing wire rod with good cold formability.
  • a method for the production of wire rod is already known, in which the wire leaves the last roll stand with an average final rolling temperature of 870 to 970 ° C, whereupon it is rapidly cooled to 700 to 850 C with water and thereafter the fanned-out wire is further cooled at an average cooling rate of less than 8 ° C / s.
  • This known method is applied to a number of steels, the aim being to achieve a homogeneous structure over the cross section of the wire rod, which structure has the desired mechanical properties.
  • the known procedure is intended to avoid the formation of bainite or martensite in the wire surface, the measures according to the prior art aiming to brake strong grain growth and to achieve the transition temperatures with a much smaller austenite grain size.
  • This fine-grained microstructure results in a higher wire rod strength, which, however, also results in less cold deformability of the wire rod.
  • the known procedure also leads to a thin, firmly adhering scale layer and a smooth wire rod surface due to the rapid cooling to a relatively low fan temperature.
  • the thin, firmly adhering scale layer is relatively difficult to remove mechanically, and the smooth wire rod surface leads to a relatively low absorption of lubricant on the surface for subsequent drawing operations.
  • the invention now aims to further improve the cold formability of certain types of steel and, in particular in the case of cold forming, less solidification, one To facilitate mechanical descaling and improve the absorption of lubricants on the surface.
  • the invention consists essentially in the fact that a wire made of a steel of the following composition and if necessary Remaining iron and usual impurities, starting from a final rolling temperature of 950 to 1100 ° C, in particular 970 to 1100 ° C, is first subjected to water and air cooling until a temperature of 850 to 1050 C, in particular 870 to 1000 ° C is reached, and then fanned out and slowly cooled at a rate of less than 5 ° C / s, preferably 1.0 to 3.5 ° C / s, to temperatures of 200 to 350 ° C, in particular 250 to 300 ° C.
  • the structure is kept close to equilibrium due to the slow cooling of the fanned wire winding in still air, which results in lower wire rod strengths.
  • the method according to the invention is particularly suitable for use on a wire rod with a diameter of 5.5-14 mm.
  • the procedure according to the invention is such that a. Wire of composition Remaining iron and usual impurities at laying temperatures of over 900 0 C in the fanned out state is cooled at a rate of less than 4 ° C / s. In this way, grain sizes according to ASTM between 5 and 7 can be achieved, whereas, according to the known prior art, much finer grain sizes between ASTM 7 and 8 can be achieved.
  • Such wire rod can be subjected to very high cold deformation without intermediate annealing.
  • the invention preferably proceeds in such a way that a wire of the composition Remainder iron with usual impurities is cooled from a laying temperature of 850 - 950 ° C at a rate of about 5 ° C / s to 300 ° C.
  • This procedure has shown that, for example, wire rod with a diameter of 8 mm can be processed into bolts without additional heat treatment. It has even been found that the production of Allen screws on machines is possible without heat treatment.
  • the procedure is preferably such that a wire rod with a composition of Rest as in claim 1, starting from a laying temperature of 850-1050 ° C at a rate of less than 2.5 ° C / s, preferably 1 ° C / s, is cooled.
  • a very strong reduction in cross-section is subsequently sought, and it has been shown that by such a treatment, for example, a wire rod, which is within this composition, with a diameter of 5.5 mm without heat treatment in 16 passes directly to a final diameter of 0.8 mm can be brought.
  • FIG. 1 shows a ZTU diagram for an inert gas welding wire
  • FIG. 2 shows a roughness profile when using the method according to the prior art
  • FIG. 3 shows a roughness profile when applying the method according to the invention to a soft drawing quality according to embodiment 1
  • FIG 4 shows a micrograph as it is achieved according to a method according to the prior art and from which the scale layer thickness and the grain size can be seen in a 500-fold enlargement
  • FIG. 5 shows an illustration similar to FIG. 4 after the method according to the invention has been used.
  • Example 1 A steel with the following composition was used to achieve a soft drawing quality: 0.02% by weight of C, 0.003% by weight of Si, 0.25% by weight of Mn, 0.022% by weight of P, 0.018% by weight. % S, 0.004% by weight Al.
  • Starting from a final rolling temperature of 1030 C cooling was first carried out to a fan-out temperature of 950 ° C and then further cooled in air in the fanned out state at a speed of approx. 2.5 ° C / s.
  • the wire rod obtained in this way had a tensile strength R m of 330 N / mm 2 and a yield strength R eh of 220 N / mm 2 .
  • the wire rod obtained in this way could be drawn from a wire rod diameter of 5.5 mm without intermediate annealing to a diameter of 0.5 mm, whereby a final strength of 1200 N / mm2 was not exceeded.
  • the grain sizes achieved according to ASTM are in the The following table 1 is compared with each other, only experiment 3 being carried out in accordance with the inventive method according to example 1 and experiments 1 and 2 being carried out in accordance with the known prior art.
  • the roughness that can be achieved according to the prior art and according to the procedure according to Example 1 is compared with one another in FIGS. 2 and 3. While the roughness profile shown in FIG. 2 gives a maximum roughness depth R max of 4.01 ⁇ m according to the prior art, as can be seen from FIG. 3, a maximum roughness i efc Rmax 8 can be achieved by using the method according to the invention according to Example 1 , Achieve 77 ⁇ m. From this greater roughness The wire rod produced by the method according to the invention results in better absorption of lubricants on the surface and thus a benefit in the cold-forming process.
  • R z in FIGS. 2 and 3 denotes the average roughness depth in accordance with DIN 4768.
  • R p indicates the smoothing depth in um and R a the mean roughness value in um.
  • the surface curve image clearly shows the different roughness profile when the method according to the prior art is compared with the method according to example 1.
  • Example 2 To achieve a wire with good cold upsetting properties, a steel with the following composition was used: 0.35% by weight C, 0.25% by weight Si, 0.70% by weight Mn, 0.024% by weight. % P, 0.022% by weight S, 0.032% by weight Al, 0.002% by weight B. A final rolling temperature of 1050 ° C. and a fan-out temperature of 870 ° C. were selected. In the fanned-out state, the cooling rate in air on the transport system was then selected to be approximately 4 ° C./s. A tensile strength R m of 570 N / mm 2 and a yield strength R eh of 300 N / mm 2 were achieved by this treatment. Starting from a diameter of 8 mm, this wire rod could be processed perfectly into bolts without additional heat treatment. Due to the low wire rod strength, very low tool wear was achieved.
  • Example 3 A steel with the following composition was used to produce an inert gas welding wire: 0.06% by weight C, 0.9% by weight Si, 1.5% by weight Mn, 0.017% by weight P, 0.020 wt% S, 0.003 wt% Al.
  • a finish rolling temperature of 1050 ° C and a fan temperature of 950 ° C were set.
  • the cooling rate was chosen to be about 1.0 ° C./s in the fanned-out state, and the conditions resulting from this procedure are shown for a wire rod with a diameter of 5.5 mm through the hatched area in FIG. 1 explained.
  • a tensile strength R m of 500 N / mm2 and a yield strength R eh of 310 N / mm2 could be achieved.
  • the wire rod could be processed in 16 passes directly to a final diameter of 0.8 mm without heat treatment.
  • Example 4 the procedure according to Example 3 is compared with the prior art, in FIG. 5 the grain size and the scale layer thickness of the formation of wire rod with a diameter of 5.5 mm for an inert gas welding wire of the composition according to Example 3 using a The method according to the prior art is shown, whereas FIG. 4 illustrates the application of the method according to Example 3.
  • FIG. 4 shows the structure of the structure, starting from a fanning out temperature of approximately 950 ° C. while maintaining an average cooling speed on the conveyor belt from the fanning out temperature to 300 ° C of about 1 ° C / s. 4 shows the much thicker scale layer, which can be removed mechanically more easily. At the same time, the coarser structure can be seen.
EP19840890127 1983-07-13 1984-07-10 Procédé de fabrication de fil machine à bonne déformabilité à froid Expired EP0132252B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT255883A AT377531B (de) 1983-07-13 1983-07-13 Verfahren zur herstellung von walzdraht mit guter kaltverformbarkeit
AT2558/83 1983-07-13

Publications (2)

Publication Number Publication Date
EP0132252A1 true EP0132252A1 (fr) 1985-01-23
EP0132252B1 EP0132252B1 (fr) 1986-12-30

Family

ID=3536427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840890127 Expired EP0132252B1 (fr) 1983-07-13 1984-07-10 Procédé de fabrication de fil machine à bonne déformabilité à froid

Country Status (5)

Country Link
EP (1) EP0132252B1 (fr)
AT (1) AT377531B (fr)
DE (1) DE3461833D1 (fr)
ES (1) ES533106A0 (fr)
FI (1) FI74737B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0247415A2 (fr) * 1986-05-28 1987-12-02 Uddeholm Tooling Aktiebolag Produit en acier allié, porte-estampes et autres produits forgés et coulés fabriqués avec cet acier et procédé pour la fabrication du produit
EP0523375A2 (fr) * 1991-06-14 1993-01-20 Nippon Steel Corporation Procédé de fabrication de ronds en acier pour être travaillé à froid
FR2790009A1 (fr) * 1999-02-22 2000-08-25 Lorraine Laminage Acier dual-phase a haute limite d'elasticite
EP1261748A1 (fr) * 2000-02-15 2002-12-04 Cargill, Incorporated Produits en barres, tiges et verins hydrauliques, et procede de fabrication
WO2005024072A1 (fr) * 2003-09-09 2005-03-17 Pewag Austria Gmbh Ebauche de chaine en acier produite en serie, son utilisation, procedes de production d'une chaine, et chaine ainsi produite

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245983A1 (de) * 1971-10-13 1973-04-19 Sumitomo Metal Ind Verfahren und vorrichtung zur kuehlung von warmgewalzten walzdraehten
US3940961A (en) * 1974-11-18 1976-03-02 Morgan Construction Company Apparatus for cooling hot rolled steel rod by forced air convection or by supplying heat
DE2717780B2 (de) * 1977-04-21 1979-11-29 Hamburger Stahlwerke Gmbh, 2103 Hamburg Herstellung von Walzdraht

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245983A1 (de) * 1971-10-13 1973-04-19 Sumitomo Metal Ind Verfahren und vorrichtung zur kuehlung von warmgewalzten walzdraehten
US3940961A (en) * 1974-11-18 1976-03-02 Morgan Construction Company Apparatus for cooling hot rolled steel rod by forced air convection or by supplying heat
DE2717780B2 (de) * 1977-04-21 1979-11-29 Hamburger Stahlwerke Gmbh, 2103 Hamburg Herstellung von Walzdraht

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0247415A2 (fr) * 1986-05-28 1987-12-02 Uddeholm Tooling Aktiebolag Produit en acier allié, porte-estampes et autres produits forgés et coulés fabriqués avec cet acier et procédé pour la fabrication du produit
EP0247415A3 (en) * 1986-05-28 1989-01-18 Uddeholm Tooling Aktiebolag Alloy steel product, die blocks and other forgings and castings made thereof and a method to manufacture the product
EP0523375A2 (fr) * 1991-06-14 1993-01-20 Nippon Steel Corporation Procédé de fabrication de ronds en acier pour être travaillé à froid
EP0523375A3 (en) * 1991-06-14 1995-05-17 Nippon Steel Corp Process for producing steel bar wire rod for cold working
FR2790009A1 (fr) * 1999-02-22 2000-08-25 Lorraine Laminage Acier dual-phase a haute limite d'elasticite
EP1261748A1 (fr) * 2000-02-15 2002-12-04 Cargill, Incorporated Produits en barres, tiges et verins hydrauliques, et procede de fabrication
EP1261748A4 (fr) * 2000-02-15 2004-12-15 Cargill Inc Produits en barres, tiges et verins hydrauliques, et procede de fabrication
WO2005024072A1 (fr) * 2003-09-09 2005-03-17 Pewag Austria Gmbh Ebauche de chaine en acier produite en serie, son utilisation, procedes de production d'une chaine, et chaine ainsi produite

Also Published As

Publication number Publication date
FI842809A (fi) 1985-01-14
FI74737B (fi) 1987-11-30
DE3461833D1 (en) 1987-02-05
ATA255883A (de) 1984-08-15
FI842809A0 (fi) 1984-07-12
EP0132252B1 (fr) 1986-12-30
ES8504263A1 (es) 1985-04-01
AT377531B (de) 1985-03-25
ES533106A0 (es) 1985-04-01

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