EP0912773B1 - Utilisation d'un acier pour supports d'outils de coupe - Google Patents

Utilisation d'un acier pour supports d'outils de coupe Download PDF

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Publication number
EP0912773B1
EP0912773B1 EP97930936A EP97930936A EP0912773B1 EP 0912773 B1 EP0912773 B1 EP 0912773B1 EP 97930936 A EP97930936 A EP 97930936A EP 97930936 A EP97930936 A EP 97930936A EP 0912773 B1 EP0912773 B1 EP 0912773B1
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EP
European Patent Office
Prior art keywords
max
steel
weight
traces
use according
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Expired - Lifetime
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EP97930936A
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German (de)
English (en)
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EP0912773A1 (fr
Inventor
Staffan Gunnarsson
Bo Rydell
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Uddeholms AB
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Uddeholms AB
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    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium

Definitions

  • the invention relates to the use as a cutting tool holder for tool bit of a steel with a specific composition.
  • a cutting tool holder for tool bits is the body on or in which the tool bit, that is active during the machining operation, is attached.
  • Cutter- and drill bodies are typical cutting tool holders, which are provided with active machining carbide elements.
  • the material in such cutting tool holders is usually a steel which is referred to as holder steel in this technical field. A number of requirements are raised upon holder steels:
  • Low or medium alloyed tool steels are used as materials for cutting tool holders for tool bits.
  • the composition of a number of typical holder steels for tool bits are listed in the table below. Besides the element mentioned in the table, which refer to weight-%, the steels only contain iron, and impurities and accessory elements. None of the known holder steels satisfies the above specified requirements in a completely satisfactory way.
  • EP-A-0 569 346 discloses a steel for a carrier (backing) strip for the teeth of a metal working saw, particularly a metal working band saw, wherein the carrier strip has a composition of, in weight-%: 0.20-0.40% C, 2.5-5.0% Cr, 2.0-3.0% Mo, 0.03-0.4% V, up to 0.15% Al, up to 1.0% Si, up to 1.5% Mn, up to 1.1% Ni, up to 4.2% Co, balance Fe and unavoidable imputities.
  • the invention suggests a steel alloy intended to be used as a material for cutting tool holders for tool bit, which satisfies the said requirements more satisfactorily than the steels of prior art.
  • the composition of the steel is given in the appending claims.
  • the invention also relates to cutting tool holders for tool bit made of the steel.
  • Carbon shall exist in an amount of at least 0.3%, preferably at least 0.35%, suitably at least 0.37%, in order that the steel shall obtain a desired hardness and strength.
  • the carbon content must not exceed 0.5%, preferably not exceed 0.45%, and suitably not exceed 0.41%.
  • the steel can be too hard and brittle.
  • the steel contains 0.39%C.
  • Silicon may exist in amounts from a trace amount to a maximum of 1.5%, but preferably the steel should contain at least 0.40% Si.
  • the silicon exists in the steel in a dissolved state, but can also exist as silicon-calcium oxides, which in their turn are preferably modified by means of sulphur, which in the form of sulphides may cover the oxide and make it essentially plastic, wherein the said inclusions can function as a lubricating film when the steel is being machined.
  • the steel should not contain more than 1.2% Si. Preferred ranges are 0.7-0.9% Si or 0.6-0.8% Si. A typical (nominal) Si content is 0.7%.
  • Manganese shall exist in an amount of at least 0.2% in order to improve the tempering resistance of the steel and in order to prevent redbrittleness of the steel through the formation of maganese sulphides, when the steel contains higher amounts of sulphur.
  • the steel shall not contain more than 1.5% maganese, preferably max. 1.0% Mn. A particularly preferred range is 0.3-0.5% Mn.
  • An optimal maganese content is 0.4%.
  • Sulphur shall exist in an amount of at least 0.01% in order to give the steel an adequate machinability.
  • the steel shall not contain more than at most 0.2% S. If the sulphur content is higher, there is a risk that redbrittleness may occur, which can not be completely compensated by a correspondingly high content of maganese.
  • the steel should not contain more than max. 0.05% sulphur.
  • a preferred content of sulphur lies in the range 0.01-0.03% S.
  • a typical (nominal) sulphur content is 0.02%.
  • Chromium shall exist in the steel in an amount between 4 and 7% in order to give the steel a good hardenability.
  • a preferred range is 4.5-5.5% Cr; typically 5.0% Cr.
  • Nickel is not a critical element in the steel, but can be tolerated in an amount up to 1%, preferably max. 0.5%.
  • Molybdenum improves the hardenability of the steel and also its tempering resistance and hence its hot hardness and shall therefor exist in an amount of at least 0.5%; max. 2.0%. A preferred range is 1.2% Mo, preferably 1.2-1.6% Mo. Typically, the steel contains 1.4% Mo. In principal, molybdenum can be replaced completely or partly by the double amount of tungsten. Tungsten, however, is an expensive alloy metal and it also complicates the handling of return scrap. Therefore, tungsten should be avoided in amounts higher than amounts recognised as impurities.
  • Cobalt for the same reason as tungsten, should not exist in the steel but can be tolerated in amounts up to max. 1.0%, preferably max. 0.05%.
  • Vanadium is favourable for the tempering resistance and the wear strength of the steel and shall exist in the steel in an amount of at least 0.2%, but not exceed 1.5%.
  • the vanadium content should lie between 0.6-1.3%, suitably between 0.8-1.1%; typically the content of vanadium is 0.95%.
  • the steel can also contain oxygen and calcium in functional amounts, more particularly 50-100 ppm oxygen and 5-75 ppm calcium in order to interact to form calcium oxides, which are modified by means of sulphur as has been mentioned in the foregoing.
  • Niobium forms primary carbonitrides which are difficult to dissolve and shall not exist in amounts above 0.5%.
  • niobium should not exist in amounts above impurity level.
  • titanium, zirconium, aluminium and other strong carbide and/or nidrideformers are impurities which are not desired and therefore shall not exist in amounts above impurity level.
  • Rare earth metals such as cerium, lanthanum and others can possibly be added to the steel in order to afford the steel isotropic features, optimal machinability, good mechanical features, and a good hot-workability.
  • the total content of the rare earth metals can amount to max. 0.4%, preferably max. 0.2%.
  • the nominal (typical) composition has the following specification: 0.37-0.41 C, 0.40-1.20 Si, 0.30-0.50 Mn, max. 0.025 P, 0.010-0.030 S, 5.00-5.30 Cr, max. 0.25 Ni, 1.25-1.50 Mo, max. 0.20 W, max. 0.20 Co, 0.90-1.00 V, max. 0.005 Ti, max. 0.030 Nb, max. 0.25 Cu, max. 0.020 Al, 5-50 ppm Ca, 60-90 ppm O, balance iron.
  • the steel is hardened from an austenitizing temperature between 860 and 1100°C, preferably between 960 and 1050°C, wherein the hardening temperature is chosen within said range depending on the desired hardness.
  • the steel is hardened from a temperature within the lower part of the range 960 - 1050°C, more particularly from a temperature of 960°C or slightly above that temperature, it is possible to achieve a hardness of 48 HRC while it is possible to achieve a hardness of 54 HRC if the steel is hardened from a temperature within the upper part of the range 960 - 1050°C, i.e. at or near 1050°C, prior to tempering.
  • Tempering can be performed either as low temperature tempering from a temperature between 180- 250°C, or as high temperature tempering from a temperature between 550-600°C in order to provide high hardness in combination with good toughness.
  • the drawing shows typical tempering curves for a steel according to the invention after hardening from different temperatures between 960 and 1025°C.
  • compositions according to Table 1 were manufactured.
  • the given contents of the elements of the compositions are mean values of measurements made on different places in the ingots that were manufactured.
  • the composition of reference material, SS 2242 has also been included.
  • the contents of the reference material are nominal contents.
  • the content of phosphorus, sulphur, aluminium, nitrogen, calcium, and oxygen have not been mentioned.
  • the balance is iron and impurities which can exist in normal amounts in addition to those impurities or accessory elements that are mentioned in the table.
  • Table 1 results from machinability tests which were performed on material in the soft annealed state are also shown.
  • the mentioned values refer to the periphery speed of the drill (mean value) in which the drill is rotated so that the total length of 1000 mm shall be achieved before the drill is worn out. Also, the number of borings that are possible to drill at a drilling rate of 30 m/min, before the drill is worn out, are stated in the table.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Heat Treatment Of Articles (AREA)
  • Scissors And Nippers (AREA)
  • Heat Treatment Of Steel (AREA)
  • Turning (AREA)

Claims (16)

  1. Utilisation d'un acier contenant, en pourcentages en poids :
       0,3 à 0,5% de C,
       des traces jusqu'à un maximum de 1,5% de Si,
       0,2 à 1,5% de Mn,
       un maximum de 0,03% de P,
       avantageusement un maximum de 0,025% de P,
       0,01 à 0,2% de S,
       4 à 7% de C,
       des traces jusqu'à un maximum de 1% de Ni,
       0,5 à 2,0% de Mo, lequel peut être complètement ou partiellement remplacé par la quantité double de W,
       des traces jusqu'à un maximum de 1% de Co,
       0,2 à 1,5% de V,
       des traces jusqu'à un maximum de 0,5% de Nb,
       des traces jusqu'à un total au maximum de 0,4% de métaux des terres rares et, facultativement, 5 à 75 ppm de Ca et 50 à 100 ppm de O, le reste étant constitué de fer et d'impuretés en quantités normales, en tant que porte-outil de coupe pour une lame d'outil.
  2. Utilisation selon la revendication 1, dans laquelle l'acier contient 0,35 à 0,45% en poids de C.
  3. Utilisation selon la revendication 2, dans laquelle l'acier contient 0,37 à 0,41% en poids de C.
  4. Utilisation selon la revendication 1, dans laquelle l'acier contient 0,4 à 1,2% en poids de Si.
  5. Utilisation selon la revendication 4, dans laquelle l'acier contient 0,7 à 0,9% en poids de Si.
  6. Utilisation selon la revendication 4, dans laquelle l'acier contient 0,6 à 0,8% en poids de Si.
  7. Utilisation selon la revendication 1, dans laquelle l'acier contient 0,2 à 1,0% en poids de Mn.
  8. Utilisation selon la revendication 7, dans laquelle l'acier contient 0,3 à 0,5% en poids de Mn.
  9. Utilisation selon la revendication 1, dans laquelle l'acier contient 0,01 à 0,05, avantageusement 0,01 à 0,03% en poids de S.
  10. Utilisation selon la revendication 1, dans laquelle l'acier contient 4,5 à 5,5% en poids de Cr.
  11. Utilisation selon la revendication 1, dans laquelle l'acier contient 1 à 2% en poids de Mo.
  12. Utilisation selon la revendication 11, dans laquelle l'acier contient 1,2 à 1,6% en poids de Mo.
  13. Utilisation selon la revendication 1, dans laquelle l'acier contient 0,6 à 1,3% de V, avantageusement 0,8 à 1,1% en poids de V.
  14. Utilisation selon la revendication 1, dans laquelle l'acier contient 60 à 90 ppm d'oxygène et 5 à 50 ppm de Ca.
  15. Utilisation selon la revendication 1, dans laquelle l'acier contient un total au maximum de 0,2% en poids de métaux des terres rares.
  16. Porte-outil de coupe pour une lame de coupe constituée d'un acier ayant la composition suivante, en pourcentages en poids:
       0,3 à 0,5% de C
       des traces jusqu'à un maximum de 1,5% de Si,
       0,2 à 1,5% de Mn,
       un maximum de 0,03% de P, avantageusement un maximum de 0,025% de P,
       0,01 à 0,2% de S,
       4 à 7% de Cr,
       des traces jusqu'à un maximum de 1% de Ni,
       0,5 à 2,0% de Mo, lequel peut être complètement ou partiellement remplacé par la quantité double de
       W,
       des traces jusqu'à un maximum de 1% de Co,
       0,2 à 1,5% de V,
    des traces jusqu'à un maximum de 0,5% de Nb,
    des traces jusqu'à un total au maximum de 0,4% de métaux des terres rares et, facultativement, 5 à 75 ppm de Ca et 50 à 100 ppm d'O, le reste étant constitué de fer et d'impuretés en quantités' normales.
EP97930936A 1996-06-25 1997-06-23 Utilisation d'un acier pour supports d'outils de coupe Expired - Lifetime EP0912773B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9602494A SE507851C2 (sv) 1996-06-25 1996-06-25 Användning av ett stål som material för skärverktygshållare
SE9602494 1996-06-25
PCT/SE1997/001112 WO1997049838A1 (fr) 1996-06-25 1997-06-23 Utilisation d'un acier pour supports d'outils de coupe

Publications (2)

Publication Number Publication Date
EP0912773A1 EP0912773A1 (fr) 1999-05-06
EP0912773B1 true EP0912773B1 (fr) 2001-10-31

Family

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EP97930936A Expired - Lifetime EP0912773B1 (fr) 1996-06-25 1997-06-23 Utilisation d'un acier pour supports d'outils de coupe

Country Status (9)

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EP (1) EP0912773B1 (fr)
JP (1) JP4210331B2 (fr)
CN (1) CN1070929C (fr)
AT (1) ATE207977T1 (fr)
AU (1) AU709145C (fr)
DE (1) DE69707883T2 (fr)
ES (1) ES2164356T3 (fr)
SE (1) SE507851C2 (fr)
WO (1) WO1997049838A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2482212C2 (ru) * 2008-07-24 2013-05-20 Си-Ар-Эс Холдингс, Инк. Высокопрочный стальной сплав с высокой ударной вязкостью
CN105734441A (zh) * 2016-04-20 2016-07-06 上海瀚氏模具成型有限公司 一种纳米化低合金耐热高强钢模具的制备方法

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2782465B1 (fr) * 1998-08-20 2000-11-10 Stephane Badot Couteau pour un porte-couteaux d'un dispositif de granulation de matieres plastiques, ainsi que porte-couteaux et dispositif de granulation comportant un tel couteau
SE515624C2 (sv) 1999-11-02 2001-09-10 Ovako Steel Ab Lufthärdande låg- till mediumkolhaltigt stål för förbättrad värmebehandling
CN102212760A (zh) * 2011-06-10 2011-10-12 钢铁研究总院 一种高韧性超高强度钢
JP2017507244A (ja) 2014-01-16 2017-03-16 ウッデホルムス アーベーＵｄｄｅｈｏｌｍｓ Ａｂ ステンレス鋼およびステンレス鋼製切削工具本体
ES2584829T3 (es) 2014-01-16 2016-09-29 Uddeholms Ab Acero inoxidable y cuerpo de herramienta de corte hecho de acero inoxidable
CN105132827B (zh) * 2015-09-09 2017-03-29 南京工程学院 一种用于获得超微细复合尺度碳化物的高热强性锻钢材料
CN105714203B (zh) * 2016-04-20 2017-12-08 上海瀚氏模具成型有限公司 一种表面纳米化高强耐热钢模具的制备方法
CN105886933B (zh) * 2016-05-12 2021-04-30 天津钢研海德科技有限公司 一种高抗回火软化性和高韧性的热作模具钢及其制造方法
TWI756226B (zh) 2016-06-30 2022-03-01 瑞典商伍德赫爾恩股份有限公司 用於工具架之鋼
CN108385025A (zh) * 2018-04-09 2018-08-10 武汉科技大学 一种板坯去毛刺机用刀片及其制造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE426177B (sv) * 1979-12-03 1982-12-13 Uddeholms Ab Varmarbetsstal
AT396560B (de) * 1992-05-06 1993-10-25 Boehler Ybbstalwerke Metallsägeblatt mit hoher biegewechselfestigkeit und hoher schnittleistung

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Title
KODYM M. ET AL.: "Spurenelemente im Stahl", 1985, VERLAG STAHLEISEN MBH, DüSSELDORF (GERMANY) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2482212C2 (ru) * 2008-07-24 2013-05-20 Си-Ар-Эс Холдингс, Инк. Высокопрочный стальной сплав с высокой ударной вязкостью
CN105734441A (zh) * 2016-04-20 2016-07-06 上海瀚氏模具成型有限公司 一种纳米化低合金耐热高强钢模具的制备方法

Also Published As

Publication number Publication date
EP0912773A1 (fr) 1999-05-06
AU709145B2 (en) 1999-08-19
WO1997049838A1 (fr) 1997-12-31
ES2164356T3 (es) 2002-02-16
HK1020360A1 (en) 2000-04-14
JP2000514500A (ja) 2000-10-31
ATE207977T1 (de) 2001-11-15
JP4210331B2 (ja) 2009-01-14
SE9602494D0 (sv) 1996-06-25
CN1222942A (zh) 1999-07-14
AU3469397A (en) 1998-01-14
SE9602494L (sv) 1997-12-26
CN1070929C (zh) 2001-09-12
DE69707883T2 (de) 2002-04-25
SE507851C2 (sv) 1998-07-20
DE69707883D1 (de) 2001-12-06
AU709145C (en) 2001-10-18

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