EP1379706B1 - Acier a outils a tenacite renforcee, procede de fabrication de pieces dans cet acier et pieces obtenues - Google Patents
Acier a outils a tenacite renforcee, procede de fabrication de pieces dans cet acier et pieces obtenues Download PDFInfo
- Publication number
- EP1379706B1 EP1379706B1 EP02727658A EP02727658A EP1379706B1 EP 1379706 B1 EP1379706 B1 EP 1379706B1 EP 02727658 A EP02727658 A EP 02727658A EP 02727658 A EP02727658 A EP 02727658A EP 1379706 B1 EP1379706 B1 EP 1379706B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- zirconium
- titanium
- bath
- composition
- 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.)
- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 48
- 239000010959 steel Substances 0.000 title claims description 48
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 229910001315 Tool steel Inorganic materials 0.000 title description 3
- 239000010936 titanium Substances 0.000 claims description 46
- 229910052726 zirconium Inorganic materials 0.000 claims description 32
- 229910052719 titanium Inorganic materials 0.000 claims description 31
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 30
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 29
- 239000000203 mixture Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 239000011651 chromium Substances 0.000 claims description 17
- 229910052750 molybdenum Inorganic materials 0.000 claims description 12
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 11
- 239000011733 molybdenum Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 239000010955 niobium Substances 0.000 claims description 9
- 229910052721 tungsten Inorganic materials 0.000 claims description 9
- 239000010937 tungsten Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- -1 chromium carbides Chemical class 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 238000011282 treatment Methods 0.000 claims description 2
- 150000001247 metal acetylides Chemical class 0.000 description 12
- 238000005266 casting Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000011575 calcium Substances 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 239000011669 selenium Substances 0.000 description 5
- 238000007792 addition Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 101150034785 gamma gene Proteins 0.000 description 1
- 238000001033 granulometry Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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 tool steel composition having a toughness reinforced compared to the shades of the prior art, a process of making this composition as well as the parts that can be thus obtained.
- Tool steels are widely used in many applications involving in particular relative movements between parts in contact, where one of the parts must maintain its integrity geometric as long as possible. Examples of these are realization, machining and cutting tools and equipment metrological.
- the grade must have good hardenability, so that the structure as homogeneous as possible over large thicknesses after the tempering.
- the inventors have found that a further improvement of the compromise toughness - mechanical and wear resistance results unexpectedly from a sufficient nitrogen content with a minimum content of titanium and / or zirconium, itself a function of the nitrogen content.
- the titanium and / or zirconium content of the steel according to the invention must be between 0.06 and 0.15% by weight. Indeed, beyond 0.15% by weight, the Precipitation of titanium nitride and / or zirconium tends to coalesce and lose its effectiveness. On the other hand, if the content is less than 0.06% by weight, the amount of titanium and / or zirconium present is insufficient to form enough nitrides of titanium and / or zirconium to obtain the improvement sought after in toughness and resistance to wear. It will be noted that zirconium may be substituted in whole or in part for titanium in the proportion of two parts of zirconium for a part of titanium.
- the nitrogen content of the steel according to the invention must be between 0.004 and 0.02% by weight, preferably between 0.006 and 0.02% by weight. We limits its content to 0.02% by weight because beyond, the tenacity tends to decrease.
- the carbon content of the steel according to the invention must be between 0.8 and 1.5% by weight, preferably between 0.8 and 1.2% by weight. Carbon must be present in an amount sufficient to form carbides and reach the level of hardness that one wishes to obtain for the shade.
- the carbon content of the steel according to the invention is between 0.9% and 1.5% by weight, in order to ensure improved hardness, unchanged heat treatment, and strength to wear by increasing the volume fraction of hard carbides.
- the chromium content of the steel according to the invention must be between 5 and 14% by weight, preferably between 7 and 9% by weight. This element allows on the one hand to increase the quenchability of the grade and, on the other hand, to form hardening carbides.
- the manganese content of the steel according to the invention must be understood between 0.2 and 3% by weight, preferably between 0.2 and 1.5% by weight. We add it in the shade according to the invention because it is a soaking element, but it is limited its content to limit the segregation which would lead to a bad forgeability and a tenacity too weak.
- the steel can contain up to 5% by weight of nickel.
- the The content of this element must remain below 1% by weight.
- its content is limited because it is a gammagene element favorable to the formation of residual austenite.
- vanadium is preferred, and it is then used in grades at least 0.1% but not exceeding 1%, preferentially less than 0.6%.
- Niobium which tends to precipitate at higher temperatures and which, from this fact, night strongly to the forgeability of steel is to be avoided and will not exceed in in any case 0.1%, and will preferably be less than 0.02% by weight.
- the silicon and / or aluminum content of the steel according to the invention be less than 2% by weight.
- these elements allow to slow the coalescence of carbides in temperature and thus reduce the kinetics of softening to income. We limit their content because beyond 2% by weight, they weaken the shade.
- the molybdenum and / or tungsten content of the steel according to the invention must be between 1 and 4% by weight, preferably between 2.4 and 3% by weight. weight. It should be noted that tungsten may be substituted in whole or in part for molybdenum in the proportion of two parts of tungsten for a part of molybdenum. These two elements make it possible to improve the quenchability of the shade and form hardening carbides. Their content is limited because they are at the origin of segregations.
- Copper may be present in the steel in content nevertheless lower than 1% not to affect the forgeability of the shade.
- sulfur in one content not exceeding 0,3% may be added, possibly accompanied calcium, selenium, tellurium in contents each less than 0.1%.
- the development of the steel grade according to the invention can be done by any conventional method, but can advantageously be carried out by the process according to the invention which constitutes a second object of the invention.
- This part manufacturing process includes a first step consisting in developing a liquid steel by melting all the elements of the grade according to the invention, with the exception of titanium and / or zirconium, and then add to the molten steel bath titanium and / or zirconium avoiding at any time local overconcentrations of titanium and / or zirconium in the steel bath molten.
- titanium and zirconium in the form of massive ferro-alloy or metallic elements generated nitrides titanium and / or zirconium coarse and consequently fewer, especially since some of them can even decant. This This situation seems to be related to the fact that these addition strong local overconcentrations of titanium and / or zirconium in the liquid at neighborhood of the added elements.
- One of the embodiments of this first step of the method according to the invention consists in adding titanium and / or zirconium in the slag covering the bath of liquid steel continuously, titanium and / or zirconium then spreading gradually in the steel bath.
- Another embodiment of this first step of the method according to the invention consists in adding titanium and / or zirconium by introducing continues a wire composed of this or these elements in the molten steel bath, while by stirring the bath by bubbling or by any other suitable method.
- Another embodiment of this first step of the method according to the invention consists in adding titanium and / or zirconium by blowing a powder containing this or these elements in the molten steel bath, while stirring the bath by bubbling or by any other suitable method.
- the elaboration is generally carried out in an arc furnace, or in a induction furnace.
- the liquid steel is poured into ingots or slabs.
- the steel can then be subjected to heat treatment according to conventional channels for tool steels.
- a heat treatment can possibly include annealing to facilitate cutting and machining, then austenitization followed by cooling according to a mode adapted to thickness, such as air or oil cooling, possibly followed by income according to the level of hardness one wishes to achieve.
- a third object of the invention is constituted by a steel piece of composition according to the invention or obtained by the implementation of the process according to the invention and whose average size of carbide precipitates of chromium, molybdenum or tungsten resulting from the solidification is between 2.5 and 6 ⁇ m, preferably between 3 and 4.5 ⁇ m.
- Two pieces are manufactured from casting 1 according to the invention and of the comparative casting 2, by hot rolling at 1150 ° C of the ingots made in these compositions.
- the samples are then austenitized at 1050 ° C. for one hour, soaked in oil and then subjected to a double income of 525 ° C for one hour to obtain a hardness of 60 Hrc.
- the casting 1 according to the invention has improved toughness compared to casting 2 comparative.
- Example 2 Two pieces are manufactured in a manner similar to that used in Example 1, and a measurement of the wear resistance is made by following the ASTM G52, which allows the determination of the volume loss experienced by samples tested.
- This test consists of measuring the weight loss of the sample subjected to abrasive wear of a quartz sand calibrated granulometry introduced between a rubber wheel and the sample fixed.
- the casting 1 according to the invention has a resistance to slightly improved wear compared to comparative casting 2.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Articles (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Description
- d'une part N ≥ 0,004%, de préférence ≥ 0,006%,
- d'autre part (Ti + Zr/2) x N ≥ 2,5.10-4 %2,
étant en outre entendu que : 2,5.10-4 %2 ≤ (Ti + Zr/2) x N.
de l'élaboration,
étant en outre entendu que : 2,5.10-4 %2 ≤ (Ti + Zr/2) x N .
Composition (% en poids) | Coulée 1 | Coulée 2 |
C | 0,98 | 0,96 |
Cr | 8,40 | 8,20 |
Mn | 0,79 | 0,83 |
Ni | 0,35 | 0,31 |
Cu | 0,26 | 0,22 |
V | 0,37 | 0,40 |
Nb | 0,01 | 0,09 |
Si | 0,97 | 0,94 |
Al | 0,03 | 0,03 |
Mo | 2,60 | 2,50 |
W | - | - |
Ti | 0,11 | 0,004 |
Zr | - | - |
N | 0,011 | 0,009 |
- Pv :
- perte volumique, exprimée en mm3,
- KV :
- énergie de rupture, exprimée en J/cm2,
- T :
- ténacité, exprimée en J/cm2.
- un essai de flexion par choc sur éprouvette Charpy prenant la forme d'un barreau entaillé en V selon la norme NF EN 10045-2, qui fournit l'énergie de rupture KV et
- un essai de flexion par choc sur barreau non entaillé (barreau de 10mm sur 10mm), qui fournit la ténacité T.
Claims (10)
- Acier à outils dont la composition comprend, les pourcentages étant exprimés en % en poids :0,8 ≤ C ≤ 1,55,0 ≤ Cr ≤ 140,2 ≤ Mn ≤ 3Ni ≤ 5V ≤ 1Nb ≤ 0,1Si+Al ≤ 2Cu ≤ 1S ≤ 0,3Ca ≤ 0,1Se ≤ 0,1Te ≤ 0,11,0 ≤ Mo+W/2 ≤ 40,06 ≤ Ti+Zr/2 ≤ 0,150,004 ≤ N ≤ 0,02
de l'élaboration,
étant en outre entendu que : 2,5.10-4 %2 ≤ (Ti + Zr/2) x N . - Acier selon la revendication 1, caractérisé en outre en ce que la composition comprend, les pourcentages étant exprimés en % en poids :0,8 ≤ C ≤ 1,27,0 ≤ Cr ≤ 90,2 ≤ Mn ≤ 1,5Ni ≤ 10,1 ≤ V ≤ 0,6Nb ≤ 0,1Si+Al ≤ 1,2Cu ≤ 1S ≤ 0,3Ca ≤ 0,1Se ≤ 0,1Te ≤ 0,12,4 ≤ Mo+W/2 ≤ 30,06 ≤ Ti+Zr/2 ≤ 0,150,004 ≤ N ≤ 0,02
de l'élaboration,
étant en outre entendu que : 2,5.10-4 %2.≤ (Ti + Zr/2) x N. - Acier selon la revendication 1 ou 2, caractérisé en outre en ce que la teneur en niobium est inférieure ou égale à 0,02% en poids.
- Acier selon l'une quelconque des revendications 1 à 3, caractérisé en outre en ce que la teneur en azote est comprise entre 0,006 et 0,02% en poids.
- Procédé de fabrication d'une pièce en acier de composition selon l'une quelconque des revendications 1 à 4, caractérisé en ce queon élabore un acier liquide par fusion de l'ensemble des éléments de ladite composition, à l'exception du titane et/ou du zirconium, puis on ajoute au bain d'acier fondu le titane et/ou le zirconium en évitant à tout instant les surconcentrations locales en titane et/ou en zirconium dans le bain d'acier fondu,on coule ledit acier liquide pour obtenir un lingot ou une brame,on soumet ledit lingot ou ladite brame à un traitement de mise en forme par déformation plastique à chaud, puis éventuellement à un traitement thermique pour obtenir ladite pièce.
- Procédé selon la revendication 5, caractérisé en ce que l'ajout du titane et/ou du zirconium est effectué en continu dans un laitier couvrant le bain d'acier liquide, le titane et/ou le zirconium se répandant ensuite de façon progressive dans ledit bain d'acier.
- Procédé selon la revendication 5, caractérisé en ce que l'ajout du titane et/ou du zirconium est effectué par introduction continue d'un fil composé de titane et/ou de zirconium dans le bain d'acier, tout en agitant ledit bain.
- Procédé selon la revendication 5, caractérisé en ce que l'ajout du titane et/ou du zirconium est effectué par soufflage d'une poudre contenant du titane et/ou du zirconium, dans le bain d'acier fondu, tout en agitant le bain.
- Pièce d'acier de composition conforme à l'une quelconque des revendications 1 à 4 ou obtenue par la mise en oeuvre du procédé selon l'une quelconque des revendications 5 à 8, caractérisée en ce que la taille moyenne des précipités de carbures de chrome, de molybdène ou de tungstène issus de la solidification est comprise entre 2,5 et 6 µm.
- Pièce d'acier selon la revendication 9, caractérisée en outre en ce que la taille moyenne des précipités de carbures de chrome, de molybdène ou de tungstène issus de la solidification est comprise entre 3 et 4,5 µm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200230072T SI1379706T1 (en) | 2001-04-18 | 2002-04-16 | Tool steel having high toughness, method for producing parts made of said steel, and parts thus obtained |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0105225A FR2823768B1 (fr) | 2001-04-18 | 2001-04-18 | Acier a outils a tenacite renforcee, procede de fabrication de pieces dans cet acier et pieces obtenues |
FR0105225 | 2001-04-18 | ||
PCT/FR2002/001302 WO2002083966A1 (fr) | 2001-04-18 | 2002-04-16 | Acier a outils a tenecite renforcee, procede de fabrication de pieces dans cet acier et pieces obtenues |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1379706A1 EP1379706A1 (fr) | 2004-01-14 |
EP1379706B1 true EP1379706B1 (fr) | 2004-11-17 |
Family
ID=8862415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02727658A Expired - Lifetime EP1379706B1 (fr) | 2001-04-18 | 2002-04-16 | Acier a outils a tenacite renforcee, procede de fabrication de pieces dans cet acier et pieces obtenues |
Country Status (26)
Country | Link |
---|---|
US (1) | US7445750B1 (fr) |
EP (1) | EP1379706B1 (fr) |
JP (1) | JP4523230B2 (fr) |
KR (1) | KR100846815B1 (fr) |
CN (1) | CN1226441C (fr) |
AR (1) | AR033220A1 (fr) |
AT (1) | ATE282721T1 (fr) |
AU (1) | AU2002257862B2 (fr) |
BR (1) | BR0209018B1 (fr) |
CA (1) | CA2444175C (fr) |
CZ (1) | CZ297762B6 (fr) |
DE (1) | DE60201984T2 (fr) |
ES (1) | ES2231691T3 (fr) |
FR (1) | FR2823768B1 (fr) |
HK (1) | HK1062460A1 (fr) |
HU (1) | HU228835B1 (fr) |
MX (1) | MXPA03009445A (fr) |
MY (1) | MY127296A (fr) |
PL (1) | PL197554B1 (fr) |
PT (1) | PT1379706E (fr) |
RU (1) | RU2279494C2 (fr) |
SK (1) | SK286725B6 (fr) |
TW (1) | TW554050B (fr) |
UA (1) | UA74258C2 (fr) |
WO (1) | WO2002083966A1 (fr) |
ZA (1) | ZA200307900B (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004059023A1 (fr) * | 2002-12-25 | 2004-07-15 | Hitachi Metals, Ltd. | Acier a matrices froid presentant d'excellentes caracteristiques de suppression de la variation dimensionnelle |
ES2365284T3 (es) * | 2007-01-12 | 2011-09-28 | Rovalma Sa | Acero de herramientas para trabajo en frío con soldabilidad excepcional. |
CN101215671B (zh) * | 2008-01-11 | 2010-08-04 | 北京工业大学 | 抗锌液腐蚀磨损材料及其制造方法 |
CN103834872A (zh) * | 2012-11-26 | 2014-06-04 | 天工爱和特钢有限公司 | 高耐磨性模具钢 |
CN103014518B (zh) * | 2012-12-10 | 2015-09-16 | 马鞍山市恒达耐磨材料有限责任公司 | 高碳高合金钢耐磨球及其制造方法 |
CN103741051B (zh) * | 2014-01-24 | 2015-05-13 | 浙江郑氏刀剑有限公司 | 宝剑剑身制作方法 |
CN104060191B (zh) * | 2014-06-27 | 2016-04-13 | 南京赛达机械制造有限公司 | 一种可提高冲击韧度的汽轮机叶片及其生产工艺 |
CN105112788A (zh) * | 2015-08-10 | 2015-12-02 | 霍邱县忠振耐磨材料有限公司 | 一种球磨机用中碳中铬合金钢球及其制备方法 |
CN105349903A (zh) * | 2015-10-28 | 2016-02-24 | 安徽省三方新材料科技有限公司 | 一种高铬高碳钢耐磨斗齿齿座 |
US20240183014A1 (en) | 2022-12-03 | 2024-06-06 | Arthur Craig Reardon | High Speed Steel Composition |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
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US1775615A (en) * | 1930-06-12 | 1930-09-09 | Heppenstall Co | Alloy steel |
US3295966A (en) * | 1964-04-30 | 1967-01-03 | Crucible Steel Co America | Versatile low-alloy tool steel |
JPS5214513A (en) * | 1975-07-25 | 1977-02-03 | Hitachi Metals Ltd | Alloy steel for tools |
JPS57143468A (en) * | 1981-02-28 | 1982-09-04 | Daido Steel Co Ltd | High-speed tool steel |
SU996506A1 (ru) * | 1981-07-15 | 1983-02-15 | Институт проблем литья АН УССР | Сталь |
JPS62208457A (ja) * | 1986-03-10 | 1987-09-12 | Toshiba Corp | 可撓性磁気シ−ト記録再生装置 |
JPS6411945A (en) * | 1987-07-03 | 1989-01-17 | Daido Steel Co Ltd | Cold tool steel |
JPH0364429A (ja) * | 1989-07-31 | 1991-03-19 | Daido Steel Co Ltd | 被削性に優れた工具鋼 |
DE69127580T2 (de) * | 1990-05-23 | 1998-04-16 | Aichi Steel Works Ltd | Lagerstahl |
FR2666351B1 (fr) * | 1990-08-29 | 1993-11-12 | Creusot Loire Industrie | Procede d'elaboration d'un acier a outils destine notamment a la fabrication de moules et acier obtenu par ce procede. |
JPH05156407A (ja) * | 1991-12-06 | 1993-06-22 | Hitachi Metals Ltd | 高性能転造ダイス用鋼およびその製造方法 |
FR2727431B1 (fr) * | 1994-11-30 | 1996-12-27 | Creusot Loire | Procede d'elaboration d'un acier au titane et acier obtenu |
US5830287A (en) * | 1997-04-09 | 1998-11-03 | Crucible Materials Corporation | Wear resistant, powder metallurgy cold work tool steel articles having high impact toughness and a method for producing the same |
SE511747C2 (sv) * | 1998-03-27 | 1999-11-15 | Uddeholm Tooling Ab | Kallarbetsstål |
JP4352491B2 (ja) * | 1998-12-25 | 2009-10-28 | 大同特殊鋼株式会社 | 快削性冷間工具鋼 |
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