EP0792944B1 - Acier utilisable notamment pour la fabrication de moules pour injection de matière plastique - Google Patents

Acier utilisable notamment pour la fabrication de moules pour injection de matière plastique Download PDF

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Publication number
EP0792944B1
EP0792944B1 EP97400354A EP97400354A EP0792944B1 EP 0792944 B1 EP0792944 B1 EP 0792944B1 EP 97400354 A EP97400354 A EP 97400354A EP 97400354 A EP97400354 A EP 97400354A EP 0792944 B1 EP0792944 B1 EP 0792944B1
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EP
European Patent Office
Prior art keywords
steel
kth
steel according
chemical composition
content
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
Application number
EP97400354A
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German (de)
English (en)
French (fr)
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EP0792944A1 (fr
Inventor
Jean Beguinot
Frédéric Chenou
Gilbert Primon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industeel France SAS
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Industeel France SAS
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Industeel France SAS filed Critical Industeel France SAS
Publication of EP0792944A1 publication Critical patent/EP0792944A1/fr
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Publication of EP0792944B1 publication Critical patent/EP0792944B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper

Definitions

  • the present invention relates to structural hardening steel usable, in particular, for the manufacture of molds for material injection plastic.
  • the molds for plastic injection are made up assemblies of parts machined from steel blocks so as to form a imprint having the form of the objects to be produced by molding.
  • the objects are mass-molded and successive moldings cause surface wear of the imprint.
  • the molds are out of order and must be replaced or repaired.
  • Repair when it is possible, consists of reloading by welding followed by machining and polishing or chemical blasting of the surface of the impression. So that the repair by welding is possible, it is necessary, in particular, that the metal brought by welding and that the areas affected by the welding heat in the metal base have satisfactory properties.
  • the ability to repair by welding is obtained, in particular, by using a steel with structural hardening treated by quenching and tempering.
  • Structural hardening is obtained by adding to steel from 2% to 5% nickel and at least one element selected from aluminum and copper, in contents between 0.5% and 3%.
  • the combined presence of nickel and copper or aluminum provides quenching and tempering bainitic or martensitic structure, the tensile strength of which is around 1400 MPa and the hardness of around 400 HB.
  • the hardening resulting from precipitation during the income of intermetallic compounds, the content of carbon may be limited. This limited carbon content makes it possible to repair the welded parts without the hardness of heat affected areas significantly exceeds 400 HB.
  • the chemical composition of steel includes, by weight, less than 0.25% carbon, less than 1% silicon, 0.9% to 2% manganese, 2% to 5% nickel, 0% to 18% chromium, 0.05% to 1% molybdenum, 0% to 0.2% sulfur, possibly titanium, niobium or vanadium in contents of less than 0.1%, possibly boron in contents of less than 0.005%, the remainder being iron and impurities resulting from processing.
  • the chromium content is chosen to be greater than 8%.
  • corrosion resistance is of no particular interest, and the chromium content remains below 2%.
  • the object of the present invention is to remedy these drawbacks by proposing a steel, usable for the manufacture of molds for injection of plastic material, having a tensile strength Rm of the order of 1400 MPa, a hardness greater than 350 HB, and preferably greater than 380 HB, a good weldability, satisfactory machinability even for very thick materials important and making it possible to increase the productivity of the installations of injection molding by shortening the cooling times after injection.
  • composition of the steel can advantageously be chosen in such a way that: 3.8 x C + 3.3 x Mn + 2.4 x Ni + ⁇ x Cr + 1.4 x (Mo + W / 2) ⁇ 8
  • the chemical composition of the steel must be such that the manganese content is less than or equal to 0.7%, and, better still, less than or equal to 0.5%; Similarly, it is preferable that the silicon content either less than or equal to 0.1%.
  • the chromium content should preferably be greater than or equal to 8%.
  • the content of chromium should preferably be less than or equal to 5%, and more preferably less than or equal to 2%, and it is preferable that the steel contains boron.
  • the invention also relates to a steel block according to the invention of characteristic dimension d greater than or equal to 20 mm, which has, at all points, either a martensitic, bainitic or martensito-bainitic structure, tempered, hardness greater than 350 HB.
  • log (d) represents the decimal logarithm of the dimension characteristic d expressed in mm.
  • the nitrogen content it is not always possible or desirable to limit the nitrogen content to less than 0.003%, in particular because it is expensive to remove the nitrogen supplied by the preparation.
  • the nitrogen content cannot be limited to less than 0.003%, it is preferable to fix the nitrogen in the form of fine titanium or zirconium nitrides.
  • the contents of titanium, zirconium and nitrogen are such that: 0.00003 ⁇ (N) x (Ti + Zr / 2) ⁇ 0.0016 and that the titanium or zirconium are introduced into the steel by progressive dissolution of an oxidized phase of titanium or zirconium, for example by effecting the addition of titanium or zirconium in non-deoxidized steel, then by adding a strong deoxidizer such as aluminum.
  • the number of titanium or zirconium nitrides of size greater than 0.1 ⁇ m, counted over an area of 1 mm 2 of a micrographic section of solid steel is lower 4 times the sum of the total content of titanium precipitated in the form of nitrides and half the total content of zirconium precipitated in the form of nitrides, expressed in thousandths of%.
  • the chemical composition of steel must, moreover, satisfy two conditions relating on the one hand to the quenchability and on the other hand to the conductivity thermal.
  • the parts constituting the material injection molds plastic must be machined in blocks first tempered for their give a structure either entirely martensitic or entirely bainitic, either mixed martensito-bainitic, but, in any event, free of ferrite and perlite, then returned to harden them by precipitation of intermetallic compounds. Quenching can be done, for example, by water, oil or air cooling after austenitization, preferably, between 850 ° C and 1050 ° C, or directly in the hot forging or rolling. Tempering generally takes place between 500 ° C and 550 ° C.
  • the blocks are, for example, rolled sheets or large forged plates whose thickness is greater than 20 mm and can range up to 800 mm, or even 1000 mm. Under these conditions, for the structure to be fully hardened, including the core of the blocks, the hardenability of the steel must be sufficient.
  • the constant Bt which represents the minimum quenchability to be obtained must minus be equal to 3.1 and, for large thicknesses, at least equal to 4.1.
  • each block has a characteristic dimension d which determines the cooling rate at the core for a determined cooling mode.
  • log (d) represents the decimal logarithm of the dimension characteristic d expressed in mm. This characteristic dimension is, by for example, the thickness of a sheet or the diameter of a round bar.
  • the inventors have found that it is possible to minimize the thermal conductivity of steel by choosing its chemical composition appropriately. This has the advantage of making it possible to increase the productivity of the plastic injection operations by shortening the cooling phase which follows the injection phase.
  • the composition must be such that: 3.8 x C + 3.3 x Mn + 2.4 x Ni + ⁇ x Cr + 1.4 x (Mo + W / 2) ⁇ 8
  • 1.4 if the chromium content is less than 8%
  • 0 if the chromium content is greater than or equal to 8%.
  • Kth is a dimensionless index varying in the same direction as the thermal resistivity of steel, i.e. inversely proportional to the thermal conductivity.
  • the main difficulty consists in reconciling a sufficient hardenability to obtain the core of thick pieces desired mechanical characteristics, low manganese content for limit, or even avoid, the presence of segregated bands, and a resistivity the lowest possible thermal or, which is equivalent, a conductivity as high as possible (for steels which must resist corrosion, because of the high chromium content, the quenchability problem does not arise not).
  • Kth / Tr is less than or equal to 3, preferably less than or equal to 2.8, and better still less than or equal to 2.5.
  • mold parts were made for plastic injection, by machining sheets of thickness from 80 to 500 mm marked A, B, C, D, E, F, F1, G, H, I, J and J1.
  • the sheets marked A to F1 were in accordance with the invention, and, for comparison, the sheets marked G to J1 were according to the prior art.
  • the chemical compositions, in thousandths of% by weight are indicated in Table 1.
  • the thicknesses d (in mm), the heat treatments, the thermal resistivity indices Kth, the thermal conductivity values Cth (in W / m / ° K) and the hardenability indices Tr (K and Tr are dimensionless indices) are shown in Table 2.
  • the results reported in Table 2 show that the steels according to the invention have thermal conductivities of 10% (E compared to H) to 60% (F compared to J) stronger than those of steels according to the prior art. These higher thermal conductivities make it possible to significantly increase the productivity of the molds by reducing the duration of the cooling phases during the molding cycles.
  • the steel F1 according to the invention has a thermal conductivity 30% higher than that of the steels J and J1 according to the prior art.
  • the manganese content of the steel F1 is very significantly lower than that of these steels, which is very favorable for the reduction of segregation.
  • the steel according to the invention is, in general, produced in the form of sheets rolled or in the form of bars or wide forged plates but it can, also, be manufactured in any other form, and, in particular, in the form of thread.
  • the repair by welding must, preferably, be made with welding wires of composition close to the composition of the mold mass.
  • the steel according to the invention is also manufactured in the form of welding wire.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heat Treatment Of Steel (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
EP97400354A 1996-03-01 1997-02-18 Acier utilisable notamment pour la fabrication de moules pour injection de matière plastique Expired - Lifetime EP0792944B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9602595A FR2745587B1 (fr) 1996-03-01 1996-03-01 Acier utilisable notamment pour la fabrication de moules pour injection de matiere plastique
FR9602595 1996-03-01

Publications (2)

Publication Number Publication Date
EP0792944A1 EP0792944A1 (fr) 1997-09-03
EP0792944B1 true EP0792944B1 (fr) 2002-06-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400354A Expired - Lifetime EP0792944B1 (fr) 1996-03-01 1997-02-18 Acier utilisable notamment pour la fabrication de moules pour injection de matière plastique

Country Status (13)

Country Link
US (1) US5785924A (ko)
EP (1) EP0792944B1 (ko)
JP (1) JPH1036938A (ko)
KR (1) KR100451474B1 (ko)
CN (1) CN1070241C (ko)
AT (1) ATE219526T1 (ko)
CA (1) CA2197532A1 (ko)
DE (1) DE69713415T2 (ko)
ES (1) ES2176632T3 (ko)
FR (1) FR2745587B1 (ko)
MX (1) MX9701554A (ko)
PT (1) PT792944E (ko)
TW (1) TW367372B (ko)

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KR100374980B1 (ko) 1999-02-12 2003-03-06 히다찌긴조꾸가부시끼가이사 우수한 기계가공성을 갖는 다이스용 고장력강
CN1097642C (zh) * 1999-07-30 2003-01-01 日立金属株式会社 焊接性、切削性和热处理性好的工具钢及其制成的金属模
US8808472B2 (en) * 2000-12-11 2014-08-19 Uddeholms Ab Steel alloy, holders and holder details for plastic moulding tools, and tough hardened blanks for holders and holder details
FR2823767B1 (fr) * 2001-04-24 2004-02-06 Pechiney Rhenalu Blocs metalliques de forte epaisseur destines a l'usinage
US6843237B2 (en) 2001-11-27 2005-01-18 Exxonmobil Upstream Research Company CNG fuel storage and delivery systems for natural gas powered vehicles
US6852175B2 (en) * 2001-11-27 2005-02-08 Exxonmobil Upstream Research Company High strength marine structures
FR2838137A1 (fr) * 2002-04-03 2003-10-10 Usinor Acier pour la fabrication de moules pour le moulage par injection de matieres plastiques ou pour la fabrication d'outils pour le travail des metaux
FR2838138B1 (fr) * 2002-04-03 2005-04-22 Usinor Acier pour la fabrication de moules d'injection de matiere plastique ou pour la fabrication de pieces pour le travail des metaux
JP4192579B2 (ja) * 2002-11-29 2008-12-10 住友金属工業株式会社 プラスチック成形金型用鋼
CN101270451B (zh) * 2007-03-19 2011-03-30 宝山钢铁股份有限公司 塑料模具钢及其制造方法
CN101311293B (zh) * 2007-05-24 2010-10-13 宝山钢铁股份有限公司 一种大型塑模模块及其制造方法
WO2009126954A2 (en) 2008-04-11 2009-10-15 Questek Innovations Llc Martensitic stainless steel strengthened by copper-nucleated nitride precipitates
US10351922B2 (en) * 2008-04-11 2019-07-16 Questek Innovations Llc Surface hardenable stainless steels
JP5239578B2 (ja) * 2008-07-22 2013-07-17 大同特殊鋼株式会社 温度調節性に優れたプラスチック成形金型用鋼
JP5412851B2 (ja) * 2009-01-29 2014-02-12 大同特殊鋼株式会社 プラスチック成形金型用鋼およびプラスチック成形金型
JP5668942B2 (ja) * 2010-02-18 2015-02-12 日立金属株式会社 孔加工性および加工歪の抑制に優れた金型用鋼およびその製造方法
JP5713195B2 (ja) * 2011-07-19 2015-05-07 大同特殊鋼株式会社 プラスチック成形金型用プリハードン鋼
KR101312822B1 (ko) * 2011-11-30 2013-09-27 주식회사 포스코 금형강 및 그의 제조방법
CN102560265A (zh) * 2012-03-06 2012-07-11 常熟市精工模具制造有限公司 1Cr17Ni2Mo玻璃模具
UA111115C2 (uk) 2012-04-02 2016-03-25 Ейкей Стіл Пропертіс, Інк. Рентабельна феритна нержавіюча сталь
CN103774047B (zh) * 2012-10-20 2017-03-01 大同特殊钢株式会社 具有优异的热导性、镜面抛光性和韧性的成型模具用钢
CN102877001A (zh) * 2012-10-29 2013-01-16 北京科技大学 一种低碳免回火全贝氏体组织塑料模具钢及制备方法
CN103266280B (zh) * 2013-06-06 2015-04-29 滁州迪蒙德模具制造有限公司 耐磨模具用钢及其生产方法
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CN106191684A (zh) * 2016-07-01 2016-12-07 宜兴市凯诚模具有限公司 一种镍钛钨合金玻璃模具
US11091825B2 (en) * 2017-04-19 2021-08-17 Daido Steel Co., Ltd. Prehardened steel material, mold, and mold component
WO2018220412A1 (fr) * 2017-06-01 2018-12-06 Arcelormittal Procede de fabrication de pieces d'acier a haute resistance mecanique et ductilite amelioree, et pieces obtenues par ce procede
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CN114250422B (zh) * 2021-12-31 2022-09-30 安徽哈特三维科技有限公司 一种韧性好热导率高的模具钢及其制备方法
CN114293113B (zh) * 2021-12-31 2022-10-18 安徽哈特三维科技有限公司 一种slm用高热导率合金粉末、高热导率模具钢及其slm成型工艺
CN114737111A (zh) * 2022-03-24 2022-07-12 南京钢铁股份有限公司 一种5Ni用钢及其生产方法
CN116103567A (zh) * 2023-01-31 2023-05-12 河钢工业技术服务有限公司 高镜面耐蚀模具钢及3d打印用粉末和制备方法

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Also Published As

Publication number Publication date
JPH1036938A (ja) 1998-02-10
US5785924A (en) 1998-07-28
FR2745587B1 (fr) 1998-04-30
TW367372B (en) 1999-08-21
ATE219526T1 (de) 2002-07-15
CN1070241C (zh) 2001-08-29
CA2197532A1 (fr) 1997-09-01
KR100451474B1 (ko) 2004-11-16
FR2745587A1 (fr) 1997-09-05
KR970065758A (ko) 1997-10-13
ES2176632T3 (es) 2002-12-01
CN1174244A (zh) 1998-02-25
DE69713415T2 (de) 2003-01-09
PT792944E (pt) 2002-09-30
DE69713415D1 (de) 2002-07-25
MX9701554A (es) 1998-04-30
EP0792944A1 (fr) 1997-09-03

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