EP0476467B1 - Method for manufacturing bright round steel bars - Google Patents

Method for manufacturing bright round steel bars Download PDF

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Publication number
EP0476467B1
EP0476467B1 EP91115166A EP91115166A EP0476467B1 EP 0476467 B1 EP0476467 B1 EP 0476467B1 EP 91115166 A EP91115166 A EP 91115166A EP 91115166 A EP91115166 A EP 91115166A EP 0476467 B1 EP0476467 B1 EP 0476467B1
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EP
European Patent Office
Prior art keywords
round steel
steel bar
descaling
bright
round
Prior art date
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Expired - Lifetime
Application number
EP91115166A
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German (de)
French (fr)
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EP0476467A2 (en
EP0476467A3 (en
Inventor
Bruno Böhmer
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.)
SMS Siemag AG
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SMS Schloemann Siemag AG
Schloemann Siemag AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/45—Scale remover or preventor
    • Y10T29/4517—Rolling deformation or deflection
    • Y10T29/4522—Rolling deformation or deflection for wire or rod
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/45—Scale remover or preventor
    • Y10T29/4533—Fluid impingement
    • Y10T29/455—Airblast
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y10T29/49986—Subsequent to metal working
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • the invention relates to a method for producing rod-shaped, bare round steel from hot-rolled round steel.
  • Bright steel, especially bright round steel, is a rolled or forged steel bar with a bright metallic surface.
  • the surface quality is mostly divided into technical quality classes, for example according to DIN 668.
  • the bright metallic surface of the steel is conventionally produced by peeling or bright drawing.
  • Bright drawing is a process for the production of drawn steel, in which the oxide layer of the surface is removed and a non-cutting cold forming takes place.
  • the stands suitable for this are drawing-rolling mills, in which a rolled-up rolling stock is drawn through the non-driven rolls of a rolling stand.
  • Drawing benches which are equipped with appropriately shaped drawing tools are also known as a suitable machine tool for producing bright steel.
  • the peeling of the round steel to produce a bare surface is a machining operation and is carried out on so-called peeling machines, which are equipped with appropriately shaped peeling knives and with guide and drive rollers.
  • the peeling of the round steel is a measure that is always associated with material loss, even if it concerns steel qualities that have not undergone edge decarburization and, viewed in this way, do not necessarily have to be treated with material removal.
  • the investment costs for a drawing roller mill, for a drawing bench or for a peeling machine are high, as are the running tool costs for peeling knives, guide and drive rollers, etc.
  • the discontinuous operation when pulling and the requirements of upstream and downstream devices involve the integration the so-called processing machines in the layout of flow wheel adjustments difficult.
  • the object of the invention is to avoid the disadvantages of peeling or drawing, in particular, of rolled round steel to produce its bare metal surface and to provide a method with which bright round steel can be produced directly from hot-rolled round steel, using equipment that are already available in post-treatment lines for round steel production.
  • the method according to the invention is characterized in that the round steel is rolled from the rolling heat in a high-precision rolling mill to a non-roundness between 0.01% and 0.1%, that the oxide layer of the round steel in a blast wheel descaling system or by pickling, Bright annealing or the like is descaled and that the round steel is then subjected to a directional polishing process.
  • a round steel bar with a bare surface can be produced, the surface quality of which is comparable to the surface quality of bright drawn or peeled round bar steel. Bending tests of the bare round steel produced according to the invention also showed no deviations from peeled or drawn material.
  • the rolling tolerance with regard to the out-of-roundness is within the proposed tolerance limits (0.01% - 0.1%), ie that the rolled steel should already be as round as possible, so that the final directional polishing process is not impaired in a directional polishing machine. If the tolerance limits for out-of-roundness are adhered to, then the straightening rollers of the straightening machine will not vibrate and thus prevent negative effects on the surface, for example by chatter marks.
  • the rolled material must also be as free as possible from scale, i.e. rust and foreign bodies must be removed so completely that residues only appear as shades or strips. This is advantageously achieved if the round steel is descaled in a blast wheel descaling system. However, it is also within the scope of this invention if the round steel is descaled on its surface by pickling, bright annealing or the like before the directional polishing process.
  • the bright round steel produced with the proposed method complies with the relevant DIN regulations according to the individual quality classes.
  • the high investment and maintenance costs for special machines for discontinuous non-cutting machining of the surface of the round steel are avoided and the removal losses of expensive material that are usually accepted when the round steel is peeled are prevented.
  • a bright round steel can be produced continuously and directly from the rolling heat without any material loss.
  • the proposed method is advantageously further developed by descaling the surface of the round steel to a degree of descaling corresponding to class A Sa 2.5 in accordance with Svensk Standard SIS 0 55900-1967.
  • the surface roughness R Z of the round steel - defined as the mean value of the absolute values of the heights of the five highest profile crests and the absolute values of the depths of the five deepest profile valleys within the reference distance - in the directional polishing machine to values between 1 ⁇ ⁇ R Z. ⁇ 8 ⁇ is set.
  • the contact forces and the straightening forces of the rollers of the straightening polishing machine can be adjusted to the extent that the proposed values for the surface roughness can be easily maintained.
  • the values for the Surface roughness makes the round steel appear bright on the outside, making the surface of the round steel suitable for further processing. Tests have also shown that if the proposed out-of-roundness is not exceeded during the rolling process, this out-of-roundness is additionally reduced by the order of 20 to 30% in the subsequent directional polishing process.
  • a hot-rolled round steel bar with a diameter of 22 mm was rolled in a final pass in a high-precision rolling mill and an out-of-roundness was maintained after the three-point measurement of 0.09 mm.
  • This round steel was then descaled to a descaling degree of A Sa 2.5 in accordance with the Swedish standard SIS 05 59 00 - 167 in a commercial centrifugal wheel descaling system using a wire grain of 0.6 mm as blasting media.
  • the descaled round steel was then subjected to a leveling process in a leveling machine.
  • the measured surface roughness R Z was 2.22 ⁇ .
  • the maximum profile depth R m ie the distance of the deepest point of the surface profile from the center line within the reference distance, was 3.52 ⁇ .
  • the arithmetic mean roughness Ra of the absolute values of the profile deviations within the reference distance was 0.24 ⁇ . All values were evaluated in accordance with DIN 47 62. The bare round steel produced thus corresponded to the quality class DIN 668.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Extraction Processes (AREA)
  • Control Of Metal Rolling (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Wire Processing (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention proposes a method for manufacturing bright steel, especially bright round steel bars produced from hot-rolled steel, according to which the round steel bars are rounded to narrow tolerances in a sizing mill from the rolling heat, the oxide layer on the round steel bars is largely removed and the round steel bars are then subjected to a straightening and polishing process.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von stabförmigem, blanken Rundstahl aus warmgewalztem Rundstahl.The invention relates to a method for producing rod-shaped, bare round steel from hot-rolled round steel.

Blankstahl, insbesondere blanker Rundstahl, ist ein gewalzter oder geschmiedeter Stabstahl mit einer metallisch blanken Oberfläche. Die Oberflächengüte ist zumeist in technische Güteklassen eingeteilt, bspw. gemäß DIN 668. Die metallisch blanke Oberfläche des Stahles wird herkömmlicherweise durch Schälen oder Blankziehen erzeugt. Blankziehen ist ein Verfahren zur Herstellung von gezogenem Stahl, bei dem die Oxidschicht der Oberfläche entfernt wird und eine spanlose Kaltumformung erfolgt. Die hierzu geeigneten Gerüste sind Zieh-Walzwerke, bei denen ein aufgehaspeltes Walzgut durch die nicht angetriebenen Walzen eines Walzgerüstes gezogen wird. Als geeignete Werkzeugmaschine zur Herstellung von Blankstahl sind auch Ziehbänke bekannt, die mit entsprechend geformten Ziehwerkzeugen ausgerüstet sind.Bright steel, especially bright round steel, is a rolled or forged steel bar with a bright metallic surface. The surface quality is mostly divided into technical quality classes, for example according to DIN 668. The bright metallic surface of the steel is conventionally produced by peeling or bright drawing. Bright drawing is a process for the production of drawn steel, in which the oxide layer of the surface is removed and a non-cutting cold forming takes place. The stands suitable for this are drawing-rolling mills, in which a rolled-up rolling stock is drawn through the non-driven rolls of a rolling stand. Drawing benches which are equipped with appropriately shaped drawing tools are also known as a suitable machine tool for producing bright steel.

Das Schälen des Rundstahles zur Erzeugung einer blanken Oberfläche ist eine spanende Bearbeitung und erfolgt auf sogenannten Schälmaschinen, die mit entsprechend geformten Schälmessern, sowie mit Führungs- und Treibrollen ausgestattet sind. Das Schälen des Rundstahles ist eine Maßnahme, welche immer mit Materialverlust verbunden ist, auch wenn es sich um Stahlqualitäten handelt, die keine Randentkohlung erfahren haben und so gesehen nicht unbedingt mit einem Materialabtrag behandelt werden müßten.The peeling of the round steel to produce a bare surface is a machining operation and is carried out on so-called peeling machines, which are equipped with appropriately shaped peeling knives and with guide and drive rollers. The peeling of the round steel is a measure that is always associated with material loss, even if it concerns steel qualities that have not undergone edge decarburization and, viewed in this way, do not necessarily have to be treated with material removal.

Aus der DE-A-2 656 258 ist ein Verfahren für die Herstellung von Blankstahl aus Walzdraht bekannt, bei dem das Werkstück zunächst kalibriert (gezogen) wird, dann umlaufend gebogen wird und schließlich geschält wird. Im Anschluß an den Schälvorgang wird das Werkstück gerichtet.From DE-A-2 656 258 a method for the production of bright steel from wire rod is known, in which the workpiece is first calibrated (drawn), then bent all round and finally peeled. Following the peeling process, the workpiece is straightened.

Die Investitionskosten für ein Ziehwalzwerk, für eine Ziehbank oder auch für eine Schälmaschine sind hoch, ebenso die laufenden Werkzeugkosten für Schälmesser, Führungs- und Treibrollen etc. Hinzu kommt, daß der diskontinuierliche Betrieb beim Ziehen und die Erfordernisse von vor- und nachgeschalteten Einrichtungen das Einbinden der sogenannten Bearbeitungsmaschinen in das Layout von Fließadjustagen erschwert.The investment costs for a drawing roller mill, for a drawing bench or for a peeling machine are high, as are the running tool costs for peeling knives, guide and drive rollers, etc. In addition, the discontinuous operation when pulling and the requirements of upstream and downstream devices involve the integration the so-called processing machines in the layout of flow wheel adjustments difficult.

Aufgabe der Erfindung ist es, die Nachteile des Schälens oder Ziehens insbesondere von gewalztem Rundstahl zur Erzeugung seiner metallisch blanken Oberfläche zu vermeiden und ein Verfahren zur Verfügung zu stellen, mit welchem blanker Rundstahl direkt aus warmgewalztem Rundstahl erzeugt werden kann, und zwar unter Verwendung von Einrichtungen, die ohnehin in Nachbehandlungslinien der Rundstahlherstellung vorhanden sind.The object of the invention is to avoid the disadvantages of peeling or drawing, in particular, of rolled round steel to produce its bare metal surface and to provide a method with which bright round steel can be produced directly from hot-rolled round steel, using equipment that are already available in post-treatment lines for round steel production.

Diese Aufgabe wird bei einem Verfahren der eingangs genannten Gattung mit den den Patentanspruch 1 kennzeichnenden Maßnahmen gelöst. Die Gegenstände der Unteransprüche 2 bis 4 stellen eine weitere vorteilhafte Weiterbildung der Erfindung dar.This object is achieved in a method of the type mentioned with the measures characterizing claim 1. The subjects of subclaims 2 to 4 represent a further advantageous development of the invention.

Nach Patentanspruch 1 ist das erfindungsgemäße Verfahren dadurch gekennzeichnet, daß der Rundstahl aus der Walzhitze in einem Hochpräzisionswalzwerk bis auf eine Unrundheit zwischen 0,01% bis 0,1% rundgewalzt wird, daß die Oxidschicht des Rundstahls in einer Schleuderrad-Entzunderungsanlage oder durch Beizen, Blankglühen oder dergleichen entzundert wird und daß der Rundstahl anschließend einem Richtpoliergang unterzogen wird. Es zeigte sich überraschenderweise, daß mit den vorgeschlagenen Maßnahmen ein Rundstahl mit blanker Oberfläche erzeugt werden kann, dessen Oberflächengüte vergleichbar ist mit der Oberflächengüte von blankgezogenem oder geschältem Rundstahl. Auch Biegeversuche des erfindungsgemäß erzeugten blanken Rundstahls zeigten keine Abweichungen von geschältem oder gezogenem Material. Es hat sich als vorteilhaft erwiesen, wenn die Walztoleranz in bezug auf die Unrundheit sich in den vorgeschlagenen Toleranzgrenzen (0,01% - 0,1%) bewegt, d.h., daß der gewalzte Stahl bereits möglichst rund sein soll, so daß der abschließende Richtpoliervorgang in einer Richtpoliermaschine nicht beeinträchtigt wird. Werden die Toleranzgrenzen für die Unrundheit eingehalten, so wird ein Schwingen der Richtrollen der Richtmaschine vermieden und damit eine negative Beeinflussung der Oberfläche bspw. durch Rattermarken unterbunden.According to claim 1, the method according to the invention is characterized in that the round steel is rolled from the rolling heat in a high-precision rolling mill to a non-roundness between 0.01% and 0.1%, that the oxide layer of the round steel in a blast wheel descaling system or by pickling, Bright annealing or the like is descaled and that the round steel is then subjected to a directional polishing process. Surprisingly, that with the proposed measures a round steel bar with a bare surface can be produced, the surface quality of which is comparable to the surface quality of bright drawn or peeled round bar steel. Bending tests of the bare round steel produced according to the invention also showed no deviations from peeled or drawn material. It has proven to be advantageous if the rolling tolerance with regard to the out-of-roundness is within the proposed tolerance limits (0.01% - 0.1%), ie that the rolled steel should already be as round as possible, so that the final directional polishing process is not impaired in a directional polishing machine. If the tolerance limits for out-of-roundness are adhered to, then the straightening rollers of the straightening machine will not vibrate and thus prevent negative effects on the surface, for example by chatter marks.

Da die Oberfläche des fertig hergestellten Rundstahles möglichst blank sein soll, so muß auch das Walzmaterial in dem Sinne möglichst frei von Zunder sein, d.h., daß auch Rost und Fremdkörper so vollständig entfernt sein müssen, daß Reste lediglich als Schattierungen oder Streifen erscheinen. Dies wird mit Vorteil dann erreicht, wenn der Rundstahl in einer Schleuderrad-Entzunderungsanlage entzundert wird. Es liegt aber auch im Rahmen dieser Erfindung, wenn der Rundstahl vor dem Richtpoliergang auf seiner Oberfläche durch Beizen, Blankglühen oder dergleichen entzundert wird.Since the surface of the finished round steel should be as bright as possible, the rolled material must also be as free as possible from scale, i.e. rust and foreign bodies must be removed so completely that residues only appear as shades or strips. This is advantageously achieved if the round steel is descaled in a blast wheel descaling system. However, it is also within the scope of this invention if the round steel is descaled on its surface by pickling, bright annealing or the like before the directional polishing process.

Als wesentlicher wirtschaftlicher Vorteil kann also herausgestellt werden, daß der mit dem vorgeschlagenen Verfahren hergestellte blanke Rundstahl den einschlägigen DIN-Vorschriften gemäß den einzelnen Güteklassen entspricht. Die hohen Investitions- und Wartungskosten für Spezialmaschinen zur diskontinuierlichen spanlosen Bearbeitung der Oberfläche des Rundstahls werden vermieden und die üblicherweise beim Schälen des Rundstahls in Kauf genommenen Abtragungsverluste von teurem Material werden verhindert.It can be emphasized as a significant economic advantage that the bright round steel produced with the proposed method complies with the relevant DIN regulations according to the individual quality classes. The high investment and maintenance costs for special machines for discontinuous non-cutting machining of the surface of the round steel are avoided and the removal losses of expensive material that are usually accepted when the round steel is peeled are prevented.

Unter Verwendung von ohnehin in Nachbehandlungslinien bei der Herstellung von Rundstahl vorhandenen Einrichtungen kann also ein blanker Rundstahl kontinuierlich und direkt aus der Walzhitze kommend ohne jeden Materialverlust hergestellt werden.Using existing facilities in post-treatment lines in the manufacture of round steel, a bright round steel can be produced continuously and directly from the rolling heat without any material loss.

Das vorgeschlagene Verfahren wird vorteilhafterweise weitergebildet, indem die Entzunderung der Oberfläche des Rundstahles bis auf einen Entzunderungsgrad entsprechend der Klasse A Sa 2,5 gemäß Svensk Standard SIS 0 55900 - 1967 durchgeführt wird.The proposed method is advantageously further developed by descaling the surface of the round steel to a degree of descaling corresponding to class A Sa 2.5 in accordance with Svensk Standard SIS 0 55900-1967.

Gemäß einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß die Oberflächenrauhheit RZ des Rundstahles - definiert als Mittelwert der Absolutwerte der Höhen der fünf höchsten Profilkuppen und der Absolutwerte der Tiefen der fünf tiefsten Profiltäler innerhalb der Bezugsstrecke - in der Richtpoliermaschine auf Werte zwischen 1µ ≦ R Z ≦ 8µ

Figure imgb0001
eingestellt wird. Versuche haben gezeigt, daß die Anstellkräfte und die Richtkräfte der Rollen der Richtpoliermaschine in dem Maße einstellbar sind, daß die vorgeschlagenen Werte für die Oberflächenrauhheit ohne weiteres eingehalten werden können. Die mit der Richtpoliermaschine eingestellten Werte für die Oberflächenrauhheit lassen den Rundstahl äußerlich blank erscheinen, die Oberfläche des Rundstahles ist damit für die Weiterverarbeitungsprozesse geeignet. Weiterhin hat sich bei Versuchen gezeigt, daß, wenn beim Walzprozeß die vorgeschlagenen Unrundheiten nicht überschritten werden, beim anschließenden Richtpoliervorgang diese Unrundheit in der Größenordnung von 20 bis 30% zusätzlich vermindert wird.According to a further embodiment of the invention, it is proposed that the surface roughness R Z of the round steel - defined as the mean value of the absolute values of the heights of the five highest profile crests and the absolute values of the depths of the five deepest profile valleys within the reference distance - in the directional polishing machine to values between 1µ ≦ R Z. ≦ 8µ
Figure imgb0001
 is set. Experiments have shown that the contact forces and the straightening forces of the rollers of the straightening polishing machine can be adjusted to the extent that the proposed values for the surface roughness can be easily maintained. The values for the Surface roughness makes the round steel appear bright on the outside, making the surface of the round steel suitable for further processing. Tests have also shown that if the proposed out-of-roundness is not exceeded during the rolling process, this out-of-roundness is additionally reduced by the order of 20 to 30% in the subsequent directional polishing process.

Beispiel:Example:

Ein warmgewalzter Rundstahl mit 22 mm Durchmesser wurde in einem letzten Walzstich in einem Hochpräzisionswalzwerk gewalzt und dabei eine Unrundheit nach der Drei-Punkt-Messung von 0,09 mm eingehalten. Anschließend wurde dieser Rundstahl in einer handelsüblichen Schleuderrad-Entzunderungsanlage bei Einsatz eines Drahtkornes von 0,6 mm als Strahlmittel auf einen Entzunderungsgrad von A Sa 2,5 gemäß dem schwedischen Standard SIS 05 59 00 - 167 entzundert. Der entzunderte Rundstahl wurde dann einem Richtpoliergang in einer Richtpoliermaschine unterzogen. Die gemessene Oberflächenrauhigkeit RZ betrug 2,22 µ. Die maximale Profiltaltiefe Rm , d.h. der Abstand des tiefsten Punktes des Oberflächenprofils von der Mittellinie innerhalb der Bezugsstrecke, betrug 3,52µ. Der arithmetische Mittenrauhwert Ra der absoluten Werte der Profilabweichungen innerhalb der Bezugsstrecke betrug 0,24 µ. Alle Werte wurden gemäß DIN 47 62 ausgewertet. Der erzeugte blanke Rundstahl entsprach damit der Güteklasse DIN 668.A hot-rolled round steel bar with a diameter of 22 mm was rolled in a final pass in a high-precision rolling mill and an out-of-roundness was maintained after the three-point measurement of 0.09 mm. This round steel was then descaled to a descaling degree of A Sa 2.5 in accordance with the Swedish standard SIS 05 59 00 - 167 in a commercial centrifugal wheel descaling system using a wire grain of 0.6 mm as blasting media. The descaled round steel was then subjected to a leveling process in a leveling machine. The measured surface roughness R Z was 2.22 µ. The maximum profile depth R m , ie the distance of the deepest point of the surface profile from the center line within the reference distance, was 3.52µ. The arithmetic mean roughness Ra of the absolute values of the profile deviations within the reference distance was 0.24 μ. All values were evaluated in accordance with DIN 47 62. The bare round steel produced thus corresponded to the quality class DIN 668.

Claims (4)

  1. Method of manufacturing rodlike bright drawn round steel bar from hot-rolled round steel bar, characterised thereby that the round steel bar from the rolling heat is rolled round in a high-precision rolling mill to a circularity tolerance of between 0.01% and 0.1%, that the oxide coating of the sound steel bar is descaled in a blower descaling plant or by pickling or by bright annealing and that the round steel bar is subsequently subjected to a dressing polishing process.
  2. Method according to claim 1, characterised thereby that the descaling of the surface of the round steel bar is carried out to a descaling degree corresponding to Class A Sa 2.5 in accordance with SVENSK STANDARD SIS 05 59 00-167.
  3. Method according to claim 1 or 2, characterised thereby that the surface roughness Rz of the round steel bar - defined as mean value of the absolute values of the heights of the five highest profile peaks and the absolute values of the depths of the five deepest profile valleys within the reference extent - is adjusted in the dressing polishing machine to values between 1 ≦ R₂ ≦ 8 microns.
  4. Method according to claim 1, 2 or 3, characterised thereby that in the case of descaling of the round steel bar in the blower descaling plant there is used as blasting medium a wire bead with a diameter of 0.4 to 0.8 millimetres, preferably 0.6 millimetres.
EP91115166A 1990-09-20 1991-09-07 Method for manufacturing bright round steel bars Expired - Lifetime EP0476467B1 (en)

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DE4029786 1990-09-20
DE4029786A DE4029786A1 (en) 1990-09-20 1990-09-20 METHOD FOR PRODUCING BLANK ROUND STEEL

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EP0476467A2 EP0476467A2 (en) 1992-03-25
EP0476467A3 EP0476467A3 (en) 1993-03-03
EP0476467B1 true EP0476467B1 (en) 1994-12-07

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DE59103782D1 (en) 1995-01-19
EP0476467A2 (en) 1992-03-25
EP0476467A3 (en) 1993-03-03
ATE115013T1 (en) 1994-12-15
US5355570A (en) 1994-10-18
DE4029786A1 (en) 1992-03-26
JPH04244367A (en) 1992-09-01

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