EP0538158A1 - Niedrig legierter, aufgeschwefelter Automatenstahl - Google Patents
Niedrig legierter, aufgeschwefelter Automatenstahl Download PDFInfo
- Publication number
- EP0538158A1 EP0538158A1 EP92420363A EP92420363A EP0538158A1 EP 0538158 A1 EP0538158 A1 EP 0538158A1 EP 92420363 A EP92420363 A EP 92420363A EP 92420363 A EP92420363 A EP 92420363A EP 0538158 A1 EP0538158 A1 EP 0538158A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cao
- steel
- steels
- weight
- mno
- 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 steels weakly alloyed with carbon-manganese and relates to steels of particular compositions which, in particular because of their sulfur content and of the composition of their oxidized inclusions, are particularly suitable for high speed machining in in particular by carbide or ceramic tools and by cutting at high cutting speed, in particular from tubes produced in said steels.
- the search for the highest performance requires the combined addition of sulfur, tellurium (or selenium) and / or lead or bismuth.
- These steels generally have a large amount of inclusions of oxides and sulfides and a high oxygen content greater than 0.0100% by weight.
- steels with 0.30% by weight of sulfur have low mechanical tensile properties, close to that of A37 steel according to AFNOR standard. Nuances for heat treatment have been standardized, but their bar turning performance is therefore weaker.
- the aim of the present invention is to propose a family of carbon-manganese steels which can be used in particular for mechanical construction having an excellent turning ability and giving excellent performance at high speed machining with carbide or ceramic tools. , performances superior to those obtained with steels with improved machinability cited above while retaining good mechanical characteristics and not having the drawbacks of free-cutting steels at 0.30% by weight of sulfur mentioned above.
- the object of the invention is in particular to create a family of clean free-cutting steels, not requiring the use of toxic elements, covering a wide range of mechanical characteristics and having much better impact toughness characteristics than those free-cutting steel at 0.30% by weight of sulfur.
- the non-metallic inclusions are located on the diagram of representation of the system Al 2 O3 - Si O2 - MnO / CaO in the domain of Anorthite or Gehlenite.
- Such a representation diagram of the system Al 2 O3 - Si O2 - MnO / CaO can be found for example in "Phase diagrams for ceramists" Edited and Published by the American Ceramic Society 1964 figure 630 page 219.
- MnO and CaO are oxides whose role is estimated to be similar.
- the carbon content is limited to 0.22% by weight and the sum carbon content plus content in manganese / 6 at 0.48% by weight, ie C% + Mn% 6 ⁇ 0.48%.
- the sulfur content is between 0.080% and 0.12% by weight.
- composition described above makes it possible, while obtaining good mechanical properties under tension, to obtain a type of favorable inclusion of oxides and sulphides, distributed homogeneously in the metal and in a limited and controlled quantity.
- This set of characteristics makes these steels suitable for bar turning in excellent conditions, this despite the relatively low sulfur content, in particular for bar turning using carbide or ceramic tools.
- Such a process makes it possible to ensure the homogeneity of the metal, both in terms of the chemical composition and the distribution of the inclusions, over the entire length of casting.
- compositions are as follows in percentages by weight: - Steel A according to: TU52b (AFNOR standard NFA 49310) VS : 0.178% Yes : 0.265% Mn : 1.270% S : 0.006% P : 0.014% Al : 0.024% It : 0.0015% 0 total : 0.0022%
- the oxide inclusions consist of calcium aluminates Al2 O3 - CaO or spinels Al2 O3 - Mgo associated with mixed sulfides (Ca, Mn) S. There are also isolated inclusions of manganese sulfides MnS in small quantities.
- - Steel B (steel version with improved machinability of steel A). according to TU 52 b q2 (AFNOR standard NFA 49310) VS : 0.180% Yes : 0.183% Mn : 1.340% S : 0.028% P : 0.016% Al : 0.022% It : 0.0016% 0 total : 0.0022%
- oxide inclusions consist of Al2O3 - CaO calcium aluminates or Al2O3 - MgO spinels associated with mixed sulfides (Ca, Mn) S. Besides these inclusions, there are numerous inclusions of manganese sulfide.
- This composition is located in the Gehlenite domain of the ternary diagram Al2 O3 - Si O2 - CaO cited above.
- steel of the invention Steel at 0.30% sulfur weight according to NFA 35561 (grade S300). R ⁇ 0.2 539 MPa Rm 558 MPa A% 5.65 ⁇ S 11.4%
- the steels according to the invention therefore have the advantage of having much better machinability properties than those of steels with improved machinability and of the same order of magnitude as those of free-cutting steels with 0.30% by weight of sulfur without having , especially in terms of mechanical characteristics and implementation of the drawbacks of these steels at 0.30% by weight of sulfur.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Shearing Machines (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Heat Treatment Of Steel (AREA)
- Turning (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9113059 | 1991-10-17 | ||
| FR919113059A FR2682686B1 (fr) | 1991-10-17 | 1991-10-17 | Acier au carbonne-manganese destine notamment au decolletage. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0538158A1 true EP0538158A1 (de) | 1993-04-21 |
| EP0538158B1 EP0538158B1 (de) | 1997-01-29 |
Family
ID=9418212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92420363A Expired - Lifetime EP0538158B1 (de) | 1991-10-17 | 1992-10-15 | Niedrig legierter, aufgeschwefelter Automatenstahl |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0538158B1 (de) |
| AT (1) | ATE148505T1 (de) |
| DE (2) | DE69217153T2 (de) |
| ES (1) | ES2096739T3 (de) |
| FR (1) | FR2682686B1 (de) |
| IT (1) | IT1255537B (de) |
| SE (1) | SE9203015L (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1784519A2 (de) * | 2004-08-26 | 2007-05-16 | von Moos Stahl AG | Einsatzstahl und verfahren zur herstellung mit schmelzbehandlung |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2088862A5 (en) * | 1970-04-18 | 1972-01-07 | Nippon Kokan Kk | Free cutting steel |
| DE2323623A1 (de) * | 1972-05-10 | 1973-11-22 | Kobe Steel Ltd | Automatenstahl |
| US4115111A (en) * | 1973-11-13 | 1978-09-19 | Daido Tokushuko Kabushiki Kaisha | Free-cutting structural steel for machines |
| DE2839637A1 (de) * | 1977-09-15 | 1979-03-22 | British Steel Corp | Verfahren zur erzeugung aufgeschwefelten stahles |
| FR2456785A1 (fr) * | 1979-05-17 | 1980-12-12 | Daido Steel Co Ltd | Acier de decolletage contenant des inclusions determinees et un procede de sa preparation |
| DD265530A3 (de) * | 1985-06-13 | 1989-03-08 | Maxhuette Unterwellenborn Bfn | Verfahren zur herstellung eines umformbaren automatenstahles mit definiertem gefuege |
| EP0371840A1 (de) * | 1988-12-01 | 1990-06-06 | UNIMETAL Société Française des Aciers Longs | Automatenflussstahl und Verfahren zu dessen Herstellung |
-
1991
- 1991-10-17 FR FR919113059A patent/FR2682686B1/fr not_active Expired - Lifetime
-
1992
- 1992-10-08 IT ITMI922319A patent/IT1255537B/it active IP Right Grant
- 1992-10-14 SE SE9203015A patent/SE9203015L/ not_active Application Discontinuation
- 1992-10-15 DE DE69217153T patent/DE69217153T2/de not_active Expired - Lifetime
- 1992-10-15 EP EP92420363A patent/EP0538158B1/de not_active Expired - Lifetime
- 1992-10-15 ES ES92420363T patent/ES2096739T3/es not_active Expired - Lifetime
- 1992-10-15 AT AT92420363T patent/ATE148505T1/de active
- 1992-10-16 DE DE4235002A patent/DE4235002A1/de not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2088862A5 (en) * | 1970-04-18 | 1972-01-07 | Nippon Kokan Kk | Free cutting steel |
| DE2323623A1 (de) * | 1972-05-10 | 1973-11-22 | Kobe Steel Ltd | Automatenstahl |
| US4115111A (en) * | 1973-11-13 | 1978-09-19 | Daido Tokushuko Kabushiki Kaisha | Free-cutting structural steel for machines |
| DE2839637A1 (de) * | 1977-09-15 | 1979-03-22 | British Steel Corp | Verfahren zur erzeugung aufgeschwefelten stahles |
| FR2456785A1 (fr) * | 1979-05-17 | 1980-12-12 | Daido Steel Co Ltd | Acier de decolletage contenant des inclusions determinees et un procede de sa preparation |
| DD265530A3 (de) * | 1985-06-13 | 1989-03-08 | Maxhuette Unterwellenborn Bfn | Verfahren zur herstellung eines umformbaren automatenstahles mit definiertem gefuege |
| EP0371840A1 (de) * | 1988-12-01 | 1990-06-06 | UNIMETAL Société Française des Aciers Longs | Automatenflussstahl und Verfahren zu dessen Herstellung |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2096739T3 (es) | 1997-03-16 |
| ITMI922319A0 (it) | 1992-10-08 |
| SE9203015L (sv) | 1993-04-18 |
| DE69217153T2 (de) | 1997-06-05 |
| SE9203015D0 (sv) | 1992-10-14 |
| DE4235002A1 (de) | 1993-04-22 |
| FR2682686A1 (fr) | 1993-04-23 |
| IT1255537B (it) | 1995-11-09 |
| DE69217153D1 (de) | 1997-03-13 |
| FR2682686B1 (fr) | 1994-07-01 |
| ATE148505T1 (de) | 1997-02-15 |
| EP0538158B1 (de) | 1997-01-29 |
| ITMI922319A1 (it) | 1994-04-08 |
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