EP0132252B1 - Verfahren zur Herstellung von Walzdraht mit guter Kaltverformbarkeit - Google Patents

Verfahren zur Herstellung von Walzdraht mit guter Kaltverformbarkeit Download PDF

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Publication number
EP0132252B1
EP0132252B1 EP19840890127 EP84890127A EP0132252B1 EP 0132252 B1 EP0132252 B1 EP 0132252B1 EP 19840890127 EP19840890127 EP 19840890127 EP 84890127 A EP84890127 A EP 84890127A EP 0132252 B1 EP0132252 B1 EP 0132252B1
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EP
European Patent Office
Prior art keywords
wire
temperature
wire rod
cooling
good cold
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.)
Expired
Application number
EP19840890127
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German (de)
English (en)
French (fr)
Other versions
EP0132252A1 (de
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
Publication of EP0132252A1 publication Critical patent/EP0132252A1/de
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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.
  • DE-AS2717780 has already disclosed a method for producing wire rod, in which the wire has the last roll stand with a middle one. Final rolling temperature of 870 to 970 ° C, whereupon it is rapidly cooled with water to 700 to 850 ° C and then the fan with the fanned out state is further cooled with an average cooling rate of less than 8 ° C / s, to 300- 600 ° C.
  • This known method is applied to a number of steels with Si contents between 0.5 and 1.5%, a homogeneous, fine-grained structure which has the desired mechanical properties to be achieved over the cross section of the wire rod.
  • 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 structure results in a higher wire rod strength, although this also results in a lower 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 invention now aims to achieve this. to further improve the cold formability of certain types of steel and, in particular in the case of cold forming, to achieve less hardening, to facilitate mechanical descaling and to improve the absorption of lubricants on the surface.
  • a method for producing wire rod with good cold formability is proposed according to the invention, in which a wire made of a steel of the composition is used for soft drawing qualities and if necessary Remaining iron and usual impurities, starting from a final rolling temperature of 950 to 1 100 ° C, is first subjected to water and air cooling until a temperature of over 900 ° C to 1 050 ° C is reached, and then fanned out and slowly at a speed of less than 4 ° C / s is cooled to temperatures of 200 to 350 ° C,
  • Alternatively, to achieve wire with good cold heading properties one can proceed so that a wire made of a steel of the composition Remaining iron and usual contamination starting from a final rolling temperature of 950 to 1 100 ° 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 is advantageously such that the cooling rate after the fan-out is chosen to be 1.0 to 3.5 ° C./s.
  • FIG. 1 shows a roughness profile when using the method according to the prior art
  • FIG. 1 shows a roughness profile when using the method according to the invention on a soft drawing quality in accordance with exemplary embodiment 1.
  • a steel with the following composition was used to achieve a soft drawing quality: 0.02% by weight C, 0.003% by weight Si, 0.25% by weight Mn, 0.022% by weight P, 0.018% by weight S, 0.004 wt% Al.
  • Starting from a final rolling temperature of 1 030 ° C it was first cooled 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, a final strength of 1200 N / mm 2 not being exceeded.
  • the grain sizes obtained in accordance with ASTM are compared in Table 1 below, 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.
  • FIGS. 1 and 2 The achievable roughness according to the prior art and the procedure according to Example 1 is compared with one another in FIGS. 1 and 2. While the roughness profile shown in FIG. 1 corresponds to a maximum roughness depth Rmax of 4.01 ⁇ m in accordance with the prior art, as can be seen from FIG. 2, a maximum roughness depth R max 8.77 can be achieved by using the inventive method according to Example 1 ⁇ m.
  • R Z in FIGS. 1 and 2 denotes the average roughness depth according to DIN 4768 in ⁇ m.
  • Rp is the smoothing depth in ⁇ m and R a is the average roughness in ⁇ m.
  • 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.
  • 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 of S, 0.032% by weight of Al, 0.002% by weight of B.
  • a final rolling temperature of 1050 ° C. and a fan-out temperature of 870 ° C. were selected.
  • 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. The low wire rod strength also resulted in very low tool wear.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Steel (AREA)
EP19840890127 1983-07-13 1984-07-10 Verfahren zur Herstellung von Walzdraht mit guter Kaltverformbarkeit Expired EP0132252B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=3536427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840890127 Expired EP0132252B1 (de) 1983-07-13 1984-07-10 Verfahren zur Herstellung von Walzdraht mit guter Kaltverformbarkeit

Country Status (5)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4673433A (en) * 1986-05-28 1987-06-16 Uddeholm Tooling Aktiebolag Low-alloy steel material, die blocks and other heavy forgings made thereof and a method to manufacture the material
JP3215891B2 (ja) * 1991-06-14 2001-10-09 新日本製鐵株式会社 冷間加工用棒鋼線材の製造方法
FR2790009B1 (fr) * 1999-02-22 2001-04-20 Lorraine Laminage Acier dual-phase a haute limite d'elasticite
US6395109B1 (en) * 2000-02-15 2002-05-28 Cargill, Incorporated Bar product, cylinder rods, hydraulic cylinders, and method for manufacturing
ATE377095T1 (de) * 2003-09-09 2007-11-15 Pewag Austria Gmbh Verwendung eines stahls zur herstellung von ketten, verfahren zur herstellung einer kette und damit hergestellte kette

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA961314A (en) * 1971-10-13 1975-01-21 Takuo Mizoguchi Method and apparatus for cooling wire rods
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

Also Published As

Publication number Publication date
AT377531B (de) 1985-03-25
ES8504263A1 (es) 1985-04-01
FI74737B (fi) 1987-11-30
EP0132252A1 (de) 1985-01-23
DE3461833D1 (en) 1987-02-05
FI842809A0 (fi) 1984-07-12
ES533106A0 (es) 1985-04-01
FI842809A (fi) 1985-01-14
ATA255883A (de) 1984-08-15

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