EP0123632B2 - Verfahren zur Herstellung von Stählen mit hoher Zerspanbarkeit (Automatenstahl) - Google Patents

Verfahren zur Herstellung von Stählen mit hoher Zerspanbarkeit (Automatenstahl) Download PDF

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Publication number
EP0123632B2
EP0123632B2 EP84420046A EP84420046A EP0123632B2 EP 0123632 B2 EP0123632 B2 EP 0123632B2 EP 84420046 A EP84420046 A EP 84420046A EP 84420046 A EP84420046 A EP 84420046A EP 0123632 B2 EP0123632 B2 EP 0123632B2
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EP
European Patent Office
Prior art keywords
calcium
ppm
steel
content
sulphur
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Expired - Lifetime
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EP84420046A
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English (en)
French (fr)
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EP0123632A1 (de
EP0123632B1 (de
Inventor
André Gueussier
Edmond Vachiery
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Vallourec SA
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Vallourec SA
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Application filed by Vallourec SA filed Critical Vallourec SA
Priority to AT84420046T priority Critical patent/ATE22705T1/de
Publication of EP0123632A1 publication Critical patent/EP0123632A1/de
Application granted granted Critical
Publication of EP0123632B1 publication Critical patent/EP0123632B1/de
Publication of EP0123632B2 publication Critical patent/EP0123632B2/de
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires

Definitions

  • the process which is the subject of the invention relates to steels with high machinability.
  • the high sulfur contents have no particularly favorable effect.
  • the inclusions of oxides are particularly harmful, because they cause wear of the cutting tool. It is possible to reduce the novelty of these inclusions by known means. We can, in particular, reduce the amount through good deoxidation and good decantation. We can also make these inclusions, generally based on alumina, globular by the addition of alkaline earth elements such as calcium, or other elements. We can finally arrange for these remaining globular inclusions to contain a certain amount of combined sulfur which reduces their harmfulness.
  • the sulfur content is generally not greater than that which is usually present in the steel, that is to say less than 500 ppm (parts per million by mass), and generally of the order from 150 to 500 ppm. In this interval, it is often sought to target a narrower sulfur content range, for a given use and grade, which presents serious difficulties.
  • the oxygen content is preferably lowered below 50 ppm and, preferably also, the desulfurization is carried out until a sulfur content of less than 50 ppm is obtained.
  • the calcium and sulfur additions can be carried out either successively, the calcium being introduced first, or simultaneously.
  • the addition of calcium is carried out by means of a cored wire advantageously containing a calcium alloy in grains or powder, such as a silicocalcium.
  • the addition of sulfur is carried out by means of a cored wire advantageously containing flower of sulfur or a sulphide.
  • the process makes it possible in particular to obtain repoductively steels for which the difference between the sulfur content obtained and the targeted content does not exceed ⁇ 40 ppm.
  • the process according to the invention makes it possible, thanks to the very precise additions of calcium and sulfur thus carried out, to obtain finely distributed globular inclusions which confer reproducible manner on steel, high machinability. These steels are particularly suitable for high speed machining using carbide cutting tools.
  • the calcium is then introduced into the liquid steel by means of a cored wire such as, for example, that described in FR 2 476 542.
  • This wire consists of an envelope, generally made of mild steel. , a few tenths of a mm thick, which surrounds the core which contains the calcium in the divided state in the form of metal or alloy.
  • the introduction of the cored wire is preferably carried out at a relatively rapid speed in general of the order of 1 to a few meters per second. This speed is adjusted as a function of the content of the calcium-filled wire per unit of length and of the quantity to be introduced, so that the duration of this introduction does not exceed a few minutes.
  • the wire is made to penetrate from top to bottom through the metal bath, at an angle preferably close to 90 ° relative to the horizontal.
  • the amount of calcium thus introduced into the liquid steel bath, in the form of metal or alloy, is preferably between 150 and 600 g / t, which allows, after reduction of the oxides still present in the metal , obtaining a calcium content preferably between 20 and 80 ppm.
  • the liquid steel bath thus added with calcium is preferably homogenized by stirring before the addition of sulfur. This latter addition is carried out by means of a cored wire containing either sulfur in bloom or a sulphide such as iron or manganese sulphide, in pulverulent or granular form.
  • the envelope is generally made of mild steel a few tenths of a mm thick, as in the case of the addition of calcium.
  • the introduction of sulfur is carried out like that of calcium at relatively high speed.
  • the steel is cast either in ingots or by means of a continuous casting installation. Maximum care must be taken to avoid reoxidation of the liquid steel jets during this casting operation.
  • the tubes thus obtained have a machinability, by means of carbide cutting tools, much greater than that of common steels of the same composition.
  • the duration in minutes on the abscissa along the axis T was shown for a frontal wear of tools of 0.4 mm and on the ordinate along the axis V the cutting speed in meters per minute.
  • the curves A and B of the single figure thus give for each steel corresponding to the normalized state the cutting speed in meters per minute which allows a determined cutting time corresponding to a frontal wear of the tool of 0.4 mm.
  • This is a dry run test carried out with an ISO-P30 carbide tool, the feed being 0.4 mm per revolution and the depth of the pass 2 mm.
  • Example 2 The same steel as in Example 1 is produced under similar conditions, but by carrying out the final additions of calcium and sulfur using a cored wire containing a mixture of the flower of the coufre and of calcium-silicon at 30 % by mass of calcium.
  • This mixture contains 20% sulfur and 80% silico-calcium. This cored wire weighs 170 g per meter. It is introduced at 120 m per minute for 4 minutes, giving results similar to those of Example 1.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Powder Metallurgy (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Glass Compositions (AREA)
  • Catalysts (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)

Claims (11)

1. Verfahren zur Herstellung eines Stahls mit hoher Zerspanbarkeit, bei dem man durch Schmelzen in herkömmlicher Weise einen nichtlegierten oder legierten oder rostfreien Stahl erzeugt, dadurch gekennzeichnet, daß man, nach Erzeugung des Stahls in herkömmlicher Weise, einer Aluminiumzusatz, um den Gehalt des Stahls an Sauerstoff unter 100 ppm zu senken, und eine weitgehende Entschwefelung durch eine basische Schlacke vornimmt, um den Gehalt des Stahls an Schwefel unter 100 ppm zu senken, und daß man dann, als umhüllten Draht, Zusätze von Calcium und Schwefel vornimmt, um im Stahl einen Calciumgehalt von 20 bis 100 ppm und einen Schwefelgehalt von 150 bis 500 ppm zu erreichen, wobei der Aluminiumzusatz so vorgenommen wird, daß der Rest-gehalt des Stahls an gelöstem Aluminium im Bereich von 150 bis 500 ppm liegt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Desoxydation so durchgeführt wird, daß der Sauerstoffgehalt des Stahls unter 50 ppm gesenkt wird.
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Entschwefelung so durchgeführt wird, daß der Schwefelgehalt des Stahls unter 50 ppm gesenkt wird.
4. Verfahren nach einem der Ansprüche 1, 2 oder 3, dadurch gekennzeichnet, daß die Zusätze von Calcium und Schwefel nacheinander durchgeführt werden, wobei das Calcium zuerst zugegeben wird.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß das Calcium als umhüllter Draht zugegeben wird, der eine körnige Calciumlegierung, wie ein Calciumsilicid, enthält.
6. Verfahren nach Anspruch 5 oder 4, dadurch gekennzeichnet, daß Schwefel als umhüllter Draht zugegeben wird, der Schwefelblumen oder ein Sulfid enthält.
7. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß Calcium und Schwefel gleichzeitig als wenigstens ein umhüllter Draht zugegeben werden.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß Schwefel in einer Menge von 150 bis 300 ppm zugegeben wird.
9. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß man den Schwefelgehalt mit einer solchen Genauigkeit im Bereich von 150 bis 500 ppm einstellt, daß die Abweichung des erhaltenen Werts von beabsichtigten Wert nicht größer als ± 40 ppm ist.
10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Stufen der Senkung des Sauerstoffgehalts, der Entschwefelung und der Zugabe von Calcium und Schwefel in der Gießpfanne durchgeführt werden.
11. Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß das Metall kontinuerlich gegossen wird.
EP84420046A 1983-03-15 1984-03-14 Verfahren zur Herstellung von Stählen mit hoher Zerspanbarkeit (Automatenstahl) Expired - Lifetime EP0123632B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84420046T ATE22705T1 (de) 1983-03-15 1984-03-14 Verfahren zur herstellung von staehlen mit hoher zerspanbarkeit (automatenstahl).

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304611A FR2542761B1 (fr) 1983-03-15 1983-03-15 Procede de fabrication d'aciers a haute usinabilite
FR8304611 1983-03-15

Publications (3)

Publication Number Publication Date
EP0123632A1 EP0123632A1 (de) 1984-10-31
EP0123632B1 EP0123632B1 (de) 1986-10-08
EP0123632B2 true EP0123632B2 (de) 1991-01-02

Family

ID=9287068

Family Applications (1)

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EP84420046A Expired - Lifetime EP0123632B2 (de) 1983-03-15 1984-03-14 Verfahren zur Herstellung von Stählen mit hoher Zerspanbarkeit (Automatenstahl)

Country Status (10)

Country Link
US (1) US4531972A (de)
EP (1) EP0123632B2 (de)
JP (1) JPS59177347A (de)
AT (1) ATE22705T1 (de)
CA (1) CA1226737A (de)
DE (1) DE3460903D1 (de)
ES (1) ES530575A0 (de)
FR (1) FR2542761B1 (de)
MX (1) MX160762A (de)
ZA (1) ZA841899B (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4746361A (en) * 1987-04-03 1988-05-24 Inland Steel Company Controlling dissolved oxygen content in molten steel
DE3739156A1 (de) * 1987-11-19 1989-06-01 Sueddeutsche Kalkstickstoff Stickstoffhaltiges zusatzmittel fuer stahlschmelzen
DE3939936A1 (de) * 1989-12-02 1991-06-06 Messerschmitt Boelkow Blohm Steckverbindung zum elektrischen verbinden von leiterplatten
US5397379A (en) * 1993-09-22 1995-03-14 Oglebay Norton Company Process and additive for the ladle refining of steel
US6179895B1 (en) 1996-12-11 2001-01-30 Performix Technologies, Ltd. Basic tundish flux composition for steelmaking processes
US7682418B2 (en) * 2004-02-11 2010-03-23 Tata Steel Limited Cored wire injection process in steel melts
RU2465341C2 (ru) * 2011-01-20 2012-10-27 Открытое акционерное общество "Новолипецкий металлургический комбинат" Способ обработки низкоуглеродистой стали в ковше
RU2514125C1 (ru) * 2012-11-30 2014-04-27 Открытое акционерное общество "Магнитогорский металлургический комбинат" Способ раскисления низкоуглеродистой стали
RU2564373C1 (ru) * 2014-07-10 2015-09-27 Публичное акционерное общество "Северсталь" (ПАО "Северсталь") Способ производства трубной стали
RU2607877C2 (ru) * 2015-06-10 2017-01-20 Открытое акционерное общество "Волжский трубный завод" Способ внепечной обработки стали
RU2637194C1 (ru) * 2016-11-22 2017-11-30 Федеральное Государственное Унитарное Предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина" (ФГУП "ЦНИИчермет им. И.П. Бардина") Способ ковшовой обработки легированных сталей
RU2639080C1 (ru) * 2016-12-28 2017-12-19 Акционерное общество "Научно-производственное объединение "Центральный научно-исследовательский институт технологии машиностроения", АО "НПО "ЦНИИТМАШ" Способ производства стали
RU2708281C1 (ru) * 2018-09-28 2019-12-05 РЕЙЛ 1520 АйПи ЛТД Способ внепечной обработки стали
RU2686510C1 (ru) * 2018-11-27 2019-04-29 Акционерное общество "Выксунский металлургический завод" Способ производства стали для изготовления труб
RU2713770C1 (ru) * 2019-05-31 2020-02-07 Публичное акционерное общество "Трубная металлургическая компания" (ПАО "ТМК") Способ производства стали с нормируемым содержанием серы

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US3467167A (en) * 1966-09-19 1969-09-16 Kaiser Ind Corp Process for continuously casting oxidizable metals
GB1206062A (en) * 1967-10-18 1970-09-23 Nippon Kokan Kk Deoxidation method
DE1802991B2 (de) * 1968-10-14 1972-02-17 Süddeutsche Kalkstickstoff-Werke AG, 8223 Trostberg Verwendung einer desoxydationslegierung zur herstellung von zumstranggiessen geeigneten stahlschmelzen
US4035892A (en) * 1972-06-30 1977-07-19 Tohei Ototani Composite calcium clad material for treating molten metals
US4235007A (en) * 1975-07-25 1980-11-25 Hitachi Cable, Ltd. Method of production of a wire-shaped composite addition material
US4057420A (en) * 1976-02-06 1977-11-08 Airco, Inc. Methods for dissolving volatile addition agents in molten metal
US4094666A (en) * 1977-05-24 1978-06-13 Metal Research Corporation Method for refining molten iron and steels
DE2839637A1 (de) * 1977-09-15 1979-03-22 British Steel Corp Verfahren zur erzeugung aufgeschwefelten stahles
US4373967A (en) * 1979-04-09 1983-02-15 Lukens, Inc. Process for making resulfurized machinable steel
JPS5940202B2 (ja) * 1979-12-20 1984-09-28 株式会社神戸製鋼所 極低ｓ１快削鋼の製造方法
JPS56105460A (en) * 1980-01-26 1981-08-21 Nippon Steel Corp Low-carbon low-sulfur free cutting steel and production thereof
FR2476542B1 (de) * 1980-02-26 1983-03-11 Vallourec
US4286984A (en) * 1980-04-03 1981-09-01 Luyckx Leon A Compositions and methods of production of alloy for treatment of liquid metals
JPS57134541A (en) * 1981-02-16 1982-08-19 Kawasaki Steel Corp Manufacture of low-carbon sulfur free cutting steel

Also Published As

Publication number Publication date
EP0123632A1 (de) 1984-10-31
JPH0368099B2 (de) 1991-10-25
FR2542761A1 (fr) 1984-09-21
JPS59177347A (ja) 1984-10-08
CA1226737A (fr) 1987-09-15
FR2542761B1 (fr) 1987-10-16
ZA841899B (en) 1984-10-31
ATE22705T1 (de) 1986-10-15
ES8504945A1 (es) 1985-04-16
MX160762A (es) 1990-05-09
EP0123632B1 (de) 1986-10-08
DE3460903D1 (en) 1986-11-13
ES530575A0 (es) 1985-04-16
US4531972A (en) 1985-07-30

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