EP0709481B1 - Niedrig legierter Stahl zur Herstellung von Spritzformen für plastische Werkstoffe oder für Gegenstände aus Gummi - Google Patents

Niedrig legierter Stahl zur Herstellung von Spritzformen für plastische Werkstoffe oder für Gegenstände aus Gummi Download PDF

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Publication number
EP0709481B1
EP0709481B1 EP95402230A EP95402230A EP0709481B1 EP 0709481 B1 EP0709481 B1 EP 0709481B1 EP 95402230 A EP95402230 A EP 95402230A EP 95402230 A EP95402230 A EP 95402230A EP 0709481 B1 EP0709481 B1 EP 0709481B1
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EP
European Patent Office
Prior art keywords
steel
manufacture
plastics
alloy steel
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
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EP95402230A
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English (en)
French (fr)
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EP0709481A1 (de
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
Original Assignee
Creusot Loire SA
Creusot Loire Industrie SA
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Application filed by Creusot Loire SA, Creusot Loire Industrie SA filed Critical Creusot Loire SA
Publication of EP0709481A1 publication Critical patent/EP0709481A1/de
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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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Definitions

  • the present invention relates to the use of a low alloy steel for the production of molds for plastics or for rubber.
  • the molds for plastics or for rubber are manufactured by machining massive metal blocks whose thickness can exceed 500mm.
  • the surface of the impression obtained by machining is the more often either polished or chemically grained to give objects obtained by molding the desired surface appearance.
  • any point on their surface must have a high hardness between 250HB and 400HB and most often between 270HB and 350HB. They must also have the most elastic limit high possible and good resilience to resist shocks and deformations.
  • the machining operation is very important, since it commonly represents 70% of the total mold manufacturing cost, the metal must be as machinable as possible and, very often, the ability to machining cannot be obtained by conventional additions too important such as Sulfur or Lead, because these additions deteriorate aptitude for polishing or graining.
  • the molds are quite often repaired by welding, the metal used must also be as weldable as possible.
  • the metal used must have a thermal conductivity as high as possible in order to facilitate heat transfers which limit the productivity of molded object manufacturing.
  • blocks are generally used low-alloy steel sufficiently quenching to obtain, after quenching and returned a martensitic or martensito-bainitic structure having a sufficient hardness, high yield strength, good toughness.
  • the most used steel is P20 steel according to the AISI standard or W1.2311 or W1.2738 steels according to the German WERKSTOFF standard.
  • P20 steel contains, by weight, from 0.28% to 0.4% of Carbon, from 0.2% to 0.8% of Silicon, from 0.6% to 1% of Manganese, from 1.4% to 2% chromium, from 0.3% to 0.55% molybdenum, the rest being iron and impurities linked to processing.
  • W1.2311 and W1.2738 steels contain, by weight, 0.35% to 0.45% of Carbon, from 0.2% to 0.4% of Silicon, from 1.3% to 1.6% Manganese, 1.8% to 2.10% Chromium and 0.15% to 0.25% Molybdenum; W1.2738 steel also contains from 0.9% to 1.2% of Nickel, the rest being iron and impurities linked to the production.
  • This steel which certainly has good weldability and machinability acceptable, however has insufficient thermal conductivity.
  • the object of the invention is to propose a steel for the manufacture of molds for plastics or for rubber which, all having at least the same mechanical properties and ability to the machining of known steels, has a thermal conductivity greater than 40W / m / K to allow in particular to manufacture molds entirely in steel.
  • the chemical composition of the steel is such that: 0.24% ⁇ C ⁇ 0.28% 1% ⁇ Mn ⁇ 1.3% 1% ⁇ Cr ⁇ 1.5% 0.3% ⁇ Mo + W / 2 ⁇ 0.4% 0.03% ⁇ V ⁇ 0.1%
  • the silicon content of the steel is less than 0.1%.
  • Steel can also add copper to obtain a additional hardening during tempering, the steel must then contain 0.8% to 2.5% Nickel and 0.5% to 2% Copper.
  • the manufacture of molds for plastics or for rubber is done by machining of quenched hardened steel blocks whose hardness is between 270HB and 350HB.
  • FIG. 1 represents a measurement diagram of machinability in drilling according to the Taylor method.
  • steel contains or may contain elements such as silicon, Copper, Nickel either as impurities or as alloying elements complementary.
  • the copper content must be between 0.5% and 2% and be accompanied by a nickel content between 0.8% and 2.5%.
  • the hardness can also be adjusted by additions of Niobium in contents lower than 0.1%.
  • a steel is produced, the composition of which defined in claim 1 is disclosed in document JP-A-5 302 117 possibly by pre-oxidizing with Silicon, then a deoxidation to aluminum, then titanium and boron are added.
  • the liquid metal thus obtained is poured in the form of a semi-finished product such as an ingot, a slab or a billet.
  • the semi-finished product is then reheated to a temperature of preferably less than 1300 ° C and either forged or rolled to obtain a bar or sheet metal.
  • the bar or the sheet is then soaked to obtain in all its mass a martensitic or martensito-bainitic structure.
  • the quenching can be done either directly in the rolling or forging hot if the end of rolling or end of forging temperature is less than 1000 ° C., or after austenitization at a temperature above point Ac 3 and preferably below 1000 ° C.
  • bars or sheets are subjected to tempering at temperatures above 500 ° C and preferably above 550 ° C so as to obtain a hardness between 270HB and 350HB, and preferably close to 300HB, in all points of bars or sheets and so that internal stresses generated by quenching are relaxed.
  • the surface of the imprint can then be subjected to a surface treatment such as polishing or graining to give it the desired surface appearance and possibly be nitrided or chromed.
  • a surface treatment such as polishing or graining to give it the desired surface appearance and possibly be nitrided or chromed.
  • the difference in machinability index U results in a difference in machinability as shown in fig. 1 which represents Taylor straight lines in drilling for steel A and for steel P20 taken into account example. It can be seen in this figure that at equal cutting speed, the length that can be drilled in steel A is about 10 times longer important than in P20 steel, or, for an equal pierced length, the speed allowable cutting is 25% greater in steel A than in P20 steel.
  • the weldability being all the better as the Carbon equivalent or the coefficient BH is low we see that the steel according to the invention has better weldability than P20 steel.
  • steel A has a thermal conductivity of 17% higher than that of P20 steel, moreover it has a yield strength and a much higher resilience than that of P20 steel.
  • the block After austenitization at 900 ° C, quench with water, and returned to 570 ° C, the block had a hardness close to 300HB throughout the mass and:
  • This steel has a BH index better than that of steel A but it has a worse equivalent Carbon. Its machinability index is comparable to that of steel A but its thermal conductivity is more 15% low.
  • This steel whose analysis differs from that of steel A mainly by the content of Silicon and Nickel presents the same advantages than steel A and moreover it has a good thermal conductivity better.

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  • 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)
  • Laminated Bodies (AREA)

Claims (5)

  1. Verwendung eines Stahls für die Herstellung einer Spritzform für Kunststoffe oder für Gummi mit einer chemischen Zusammensetzung, bestehend in Gewichtsprozenten aus: 0,24% ≤ C ≤ 0,35% 1% ≤ Mn ≤ 2,5% 0,3% ≤ Cr ≤ 2,5% 0,1% ≤ Mo + W/2 ≤ 0,8% Ni ≤ 2,5% 0% ≤ V ≤ 0,3% Si ≤ 0,5% 0,002% ≤ B ≤ 0,005% 0,005% ≤ Al ≤ 0,1% 0% ≤ Ti ≤ 0,1% P ≤ 0,02% Cu ≤ 2% ggf. wenigstens ein Element, das ausgewählt ist aus Nb, Zr, S, Se, Te, Bi, Ca, Sb, Pb, In und den seltenen Erden mit Gehalten von kleiner als 0,1%, wobei der Rest Eisen und aus der Verarbeitung stammende Verunreinigungen sind, wobei der Gehalt an Ni zwischen 0,8% und 2,5% liegt, wenn der Gehalt an Kupfer zwischen 0,5% und 2% liegt,
    wobei die chemische Zusammensetzung außerdem die folgenden Bedingungen erfüllt: U = 409(%C) + 19,3[%Cr+(%Mo+%W/2) + %V]+ 29,4(%Si) + 10(%Mn) + 7,2(%Ni)<200 und R = 3,82(%C) + 9,79(%Si) + 3,34(%Mn) + 11,94(%P) + 2,39(%Ni) + 1,43(%Cr) + 1,43(%Mo+%W/2)<11,14
  2. Verwendung eines Stahls für die Herstellung einer Spritzform für Kunststoffe oder für Gummi nach Anspruch 1, dadurch gekennzeichnet, dass die chemische Zusammensetzung des Stahls derart ist, dass gilt: 0,24% ≤ C ≤ 0,28% 1% ≤ Mn ≤ 1,3% 1% ≤ Cr ≤ 1,5% 0,3% ≤ Mo + W/2 ≤ 0,4% 0,03% ≤ V ≤ 0,1%
  3. Verwendung eines Stahls für die Herstellung einer Spritzform für Kunststoffe oder für Gummi nach Ansprüchen 1 oder 2, dadurch gekennzeichnet, dass Si ≤ 0,1%
  4. Verwendung eines Stahls für die Herstellung einer Spritzform für Kunststoffe oder für Gummi nach Ansprüchen 1 bis 3, dadurch gekennzeichnet, dass dieser außerdem aufweist: 0,8% ≤ Ni ≤ 2,5% 0,5% ≤ Cu ≤ 2%
  5. Verwendung eines Stahls für die Herstellung einer Spritzform für Kunststoffe oder für Gummi nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Herstellung durch Bearbeitung von gehärteten und vergüteten Blöcken mit einer Härte zwischen 270HB und 350HB erfolgt.
EP95402230A 1994-10-31 1995-10-06 Niedrig legierter Stahl zur Herstellung von Spritzformen für plastische Werkstoffe oder für Gegenstände aus Gummi Expired - Lifetime EP0709481B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9413029A FR2726287B1 (fr) 1994-10-31 1994-10-31 Acier faiblement allie pour la fabrication de moules pour matieres plastiques ou pour caoutchouc
FR9413029 1994-10-31

Publications (2)

Publication Number Publication Date
EP0709481A1 EP0709481A1 (de) 1996-05-01
EP0709481B1 true EP0709481B1 (de) 2000-01-26

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EP95402230A Expired - Lifetime EP0709481B1 (de) 1994-10-31 1995-10-06 Niedrig legierter Stahl zur Herstellung von Spritzformen für plastische Werkstoffe oder für Gegenstände aus Gummi

Country Status (11)

Country Link
US (1) US5645794A (de)
EP (1) EP0709481B1 (de)
JP (1) JP3845805B2 (de)
CN (1) CN1049700C (de)
AT (1) ATE189269T1 (de)
CA (1) CA2161740C (de)
DE (1) DE69514755T2 (de)
ES (1) ES2144113T3 (de)
FR (1) FR2726287B1 (de)
PT (1) PT709481E (de)
TW (1) TW420721B (de)

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FR2748037B1 (fr) * 1996-04-29 1998-05-22 Creusot Loire Acier reparable par soudure pour la fabrication de moules pour matieres plastiques
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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
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WO2012090562A1 (ja) * 2010-12-27 2012-07-05 日立金属株式会社 耐発錆性および熱伝導性に優れた金型用鋼およびその製造方法
JP5727400B2 (ja) * 2012-02-10 2015-06-03 株式会社日本製鋼所 プラスチック成形金型用鋼およびその製造方法
DE202012003298U1 (de) * 2012-03-30 2012-06-14 Buderus Edelstahl Gmbh Vormaterial für Kunststoffformen oder Kunststoffform
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DE102016103283A1 (de) * 2016-02-24 2017-08-24 Buderus Edelstahl Gmbh Verfahren zur Herstellung eines Warmformwerkzeuges und Warmformwerkzeug hieraus
CN107338393B (zh) * 2017-06-22 2019-10-11 江阴兴澄特种钢铁有限公司 一种屈服强度大于1400MPa超高强钢板及其生产方法
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CN110565009B (zh) * 2018-06-06 2021-07-23 中国科学院金属研究所 一种合金化的预硬性塑料模具钢及其制备方法
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Also Published As

Publication number Publication date
FR2726287B1 (fr) 1997-01-03
DE69514755T2 (de) 2000-08-10
CN1049700C (zh) 2000-02-23
ES2144113T3 (es) 2000-06-01
JPH08209298A (ja) 1996-08-13
CA2161740A1 (fr) 1996-05-01
CN1129744A (zh) 1996-08-28
FR2726287A1 (fr) 1996-05-03
DE69514755D1 (de) 2000-03-02
EP0709481A1 (de) 1996-05-01
PT709481E (pt) 2000-06-30
CA2161740C (fr) 2005-06-14
US5645794A (en) 1997-07-08
ATE189269T1 (de) 2000-02-15
TW420721B (en) 2001-02-01
JP3845805B2 (ja) 2006-11-15

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