EP0020792A1 - Gegen dynamische Beanspruchungen widerstandsfähiger hochfester Automatenstahl - Google Patents
Gegen dynamische Beanspruchungen widerstandsfähiger hochfester Automatenstahl Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- steel
- removal
- steels
- cutting
- 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
Links
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.
Landscapes
- 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)
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)
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)
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 |
-
1979
- 1979-06-08 AT AT79101820T patent/ATE10652T1/de not_active IP Right Cessation
- 1979-06-08 DE DE7979101820T patent/DE2967319D1/de not_active Expired
- 1979-06-08 EP EP79101820A patent/EP0020792B1/de not_active Expired
Patent Citations (5)
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)
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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