EP0020792A1 - Gegen dynamische Beanspruchungen widerstandsfähiger hochfester Automatenstahl - Google Patents

Gegen dynamische Beanspruchungen widerstandsfähiger hochfester Automatenstahl Download PDF

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Publication number
EP0020792A1
EP0020792A1 EP79101820A EP79101820A EP0020792A1 EP 0020792 A1 EP0020792 A1 EP 0020792A1 EP 79101820 A EP79101820 A EP 79101820A EP 79101820 A EP79101820 A EP 79101820A EP 0020792 A1 EP0020792 A1 EP 0020792A1
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EP
European Patent Office
Prior art keywords
weight
steel
removal
steels
cutting
Prior art date
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Granted
Application number
EP79101820A
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English (en)
French (fr)
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EP0020792B1 (de
Inventor
Henrik Giflo
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AT79101820T priority Critical patent/ATE10652T1/de
Priority to EP79101820A priority patent/EP0020792B1/de
Priority to DE7979101820T priority patent/DE2967319D1/de
Publication of EP0020792A1 publication Critical patent/EP0020792A1/de
Application granted granted Critical
Publication of EP0020792B1 publication Critical patent/EP0020792B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • the present invention relates to a free-cutting steel, capable of withstanding dynamic stresses and having a high resistance, even without quenching, as well as an excellent capacity for machining by removing material, which is intended for manufacturing, on machines. machines working by removing chips, machine elements with high resistance and intended to be highly stressed.
  • alloyed chip-breaking and surface lubricating elements in fact constitute impurities in the steel, they determine to some extent the parameters of the mechanical properties of free-cutting steels, and in particular the resistance of these to dynamic stresses, but even sometimes their mechanical resistance.
  • These steels generally contain 0.07 to 0.65% (by weight) of C, maximum 0.40% (by weight) of Si, 0.30 to 1.10% (by weight) of Mn, 0.15 at 0.40% (by weight) of S, at most 0.10% (by weight) of P; in addition, some shades also contain at least 0.15% (by weight) of Pb, 0.80 to 1.50% (by weight) of Cr, 0.15 to 0.50% - (by weight ) of Mo and 0.05% (by weight) of Se.
  • the parameters of the non-heat treated steels served as a basis for comparison.
  • the tensile strength of these steels is without cold deformation between 290 and 900 N / mm 2 and in the cold drawn state it is between 370 and 1100 N / mm 2 (da N / mm 2 ), values to which correspond an apparent elastic limit between 24 and 66 (da N / mm 2 ) and an elongation between 5 and 10%.
  • a group of currently known free-cutting steels therefore has a relatively good mechanical resistance, which can be adjusted to the desired values by a quenching or tempering treatment, but the plasticity of these steels and their resistance to dynamic stresses no longer satisfy the current requirements.
  • the object of the present invention is to develop such a high-strength free-cutting steel, having an excellent ability to be machined by removing material and intended for the manufacture of machine elements subjected to high stresses, steel which does not only presents, without quenching, a high resistance to dynamic stresses, but which can, moreover, be machined with a formation of chips suitable for automatic machines.
  • the steel produced according to the present invention contains, in addition to iron, 0.20 to 0.70% (by weight) of C, 1.20 to 3.00% (by weight) of Mn, maximum 1.00% (by weight) of Si, maximum 0.04% (by weight) of P, 0.05 to 0.11% (by weight) of S, at least 0.10% (by weight) of Pb, 0.001 to 0.03% (by weight) of Ca, 0.001 to 0.005% (by weight) of B, 0.007 to 0.035% (by weight) of N, 0.03 to 0.20% (by weight) of Nb and / or V, maximum 0.25% (by weight) of Zr and / or Ce, maximum 0.20% (by weight) of Be and / or Bi and at most 1.00% (by weight) of Mo and / or Ni.
  • composition according to the invention comprises, in addition to iron and usual residual elements, the elements in the following proportions:
  • alloyed elements provide the steel, when they are in the relationship according to the present invention, and without quenching, sufficient mechanical strength, while retaining the necessary plasticity; other alloyed elements ensure that the chips have an appropriate capacity for fragmentation, without causing a reduction in the resistance of the steel to dynamic stresses, and said steel according to the present invention also contains alloyed elements which contribute to the increase in power lubricant on metal faces in contact with each other, and, therefore, the excellent suitability of this steel for machining by removing material.
  • the steel according to the present invention Due to its chemical composition, the steel according to the present invention has a relatively high mechanical resistance, even in the rolled state, so that a single calibration train is sufficient to achieve the section necessary for the automatic removal of chips. and that the reduction in cross-section which had hitherto had to be carried out can be omitted, in order to provide the free cutting steel with an appropriate mechanical strength which required a great deal of work.
  • the steel according to the present invention has an excellent machinability by removal of material, and the ratio of the alloyed elements according to the present invention allows - with parameters suitable for removal of material - to obtain sufficiently small chips, even without chip breakers, as well as good lubrication and very good surface quality, which makes it possible to significantly increase the material removal parameters used.
  • the steel according to the present invention can be quenched or treated by quenching followed by tempering, both by normal heat treatment and by induction treatment, the surface hardness can therefore, if necessary, be established and regulated by simple way and on a wide range.
  • the steel according to the present invention unites the high resistance to dynamic stresses of mechanical steels, unalloyed or low alloyed, with the excellent ability to machine by removal of material presented by free-cutting steels, and this in addition to a mechanical resistance obtained without quenching and which meet the needs of most modern machine elements.
  • Loads 1 and 3 were produced in a 70 t arc furnace and poured into 6.4 t shells with a square profile.
  • the ingots were produced by rolling without surface cleaning, under normal conditions, in the form of square ingots having an edge length of 210 mm, then then transformed by rolling into steel rounds with a diameter of 16 mm, that have been air-cooled on coolers.
  • Load 2 was produced by melting in a 60 t arc furnace, then refined in a metallurgical installation equipped with pockets. The molten metal was poured into a four-die continuous casting installation with a square profile, the edge length of the billets being 240 mm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP79101820A 1979-06-08 1979-06-08 Gegen dynamische Beanspruchungen widerstandsfähiger hochfester Automatenstahl Expired EP0020792B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT79101820T ATE10652T1 (de) 1979-06-08 1979-06-08 Gegen dynamische beanspruchungen widerstandsfaehiger hochfester automatenstahl.
EP79101820A EP0020792B1 (de) 1979-06-08 1979-06-08 Gegen dynamische Beanspruchungen widerstandsfähiger hochfester Automatenstahl
DE7979101820T DE2967319D1 (en) 1979-06-08 1979-06-08 High-strength freely machinable steel capable of sustaining dynamic forces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79101820A EP0020792B1 (de) 1979-06-08 1979-06-08 Gegen dynamische Beanspruchungen widerstandsfähiger hochfester Automatenstahl

Publications (2)

Publication Number Publication Date
EP0020792A1 true EP0020792A1 (de) 1981-01-07
EP0020792B1 EP0020792B1 (de) 1984-12-05

Family

ID=8186134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79101820A Expired EP0020792B1 (de) 1979-06-08 1979-06-08 Gegen dynamische Beanspruchungen widerstandsfähiger hochfester Automatenstahl

Country Status (3)

Country Link
EP (1) EP0020792B1 (de)
AT (1) ATE10652T1 (de)
DE (1) DE2967319D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2601697A1 (fr) * 1986-06-10 1988-01-22 Stanadyne Inc Barres en acier resulfure et rephosphorise etire a froid, permettant un usinage aise, possedant des proprietes mecaniques et une usinabilite ajustees
DE102012004656B4 (de) 2011-03-15 2021-07-29 Bürkert Werke GmbH Lichtwellenleiterkupplungsteil und Lichtwellenleiterkupplung
CN114875322A (zh) * 2022-05-18 2022-08-09 湖南华菱涟钢特种新材料有限公司 钢材及其制备方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2246650A1 (de) * 1973-10-03 1975-05-02 Inland Steel Co
FR2281988A2 (fr) * 1974-08-14 1976-03-12 Inland Steel Co Procede pour ajouter du plomb a de l'acier en fusion dans une poche de coulee
FR2338995A1 (fr) * 1976-01-23 1977-08-19 Marrel Freres Acier a grain fin a usinabilite amelioree
US4115111A (en) * 1973-11-13 1978-09-19 Daido Tokushuko Kabushiki Kaisha Free-cutting structural steel for machines
FR2395323A1 (fr) * 1977-06-24 1979-01-19 Pompey Acieries Acier de construction a grains fins, a usinabilite amelioree

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2246650A1 (de) * 1973-10-03 1975-05-02 Inland Steel Co
US4115111A (en) * 1973-11-13 1978-09-19 Daido Tokushuko Kabushiki Kaisha Free-cutting structural steel for machines
FR2281988A2 (fr) * 1974-08-14 1976-03-12 Inland Steel Co Procede pour ajouter du plomb a de l'acier en fusion dans une poche de coulee
FR2338995A1 (fr) * 1976-01-23 1977-08-19 Marrel Freres Acier a grain fin a usinabilite amelioree
FR2395323A1 (fr) * 1977-06-24 1979-01-19 Pompey Acieries Acier de construction a grains fins, a usinabilite amelioree

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2601697A1 (fr) * 1986-06-10 1988-01-22 Stanadyne Inc Barres en acier resulfure et rephosphorise etire a froid, permettant un usinage aise, possedant des proprietes mecaniques et une usinabilite ajustees
DE102012004656B4 (de) 2011-03-15 2021-07-29 Bürkert Werke GmbH Lichtwellenleiterkupplungsteil und Lichtwellenleiterkupplung
CN114875322A (zh) * 2022-05-18 2022-08-09 湖南华菱涟钢特种新材料有限公司 钢材及其制备方法

Also Published As

Publication number Publication date
DE2967319D1 (en) 1985-01-17
ATE10652T1 (de) 1984-12-15
EP0020792B1 (de) 1984-12-05

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