EP0264528A1 - Non-ledeburitic high speed steels - Google Patents

Non-ledeburitic high speed steels Download PDF

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Publication number
EP0264528A1
EP0264528A1 EP87105124A EP87105124A EP0264528A1 EP 0264528 A1 EP0264528 A1 EP 0264528A1 EP 87105124 A EP87105124 A EP 87105124A EP 87105124 A EP87105124 A EP 87105124A EP 0264528 A1 EP0264528 A1 EP 0264528A1
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EP
European Patent Office
Prior art keywords
tungsten
ledeburitic
molybdenum
per cent
carbon
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
Application number
EP87105124A
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German (de)
French (fr)
Other versions
EP0264528B1 (en
Inventor
Henryk Christoph
Jan Cwajna
Franciszek Grosman
Marek Hetmanczyk
Jerzy Lejawka
Marian Malinski
Adolf Maciejny
Janusz Szala
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.)
Huta Baildon Przedsiebiorstwo Panstwowe
Politechnika Slaska im Wincentego Pstrowskiego
Huta Baildon
Original Assignee
Huta Baildon Przedsiebiorstwo Panstwowe
Politechnika Slaska im Wincentego Pstrowskiego
Huta Baildon
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Application filed by Huta Baildon Przedsiebiorstwo Panstwowe, Politechnika Slaska im Wincentego Pstrowskiego, Huta Baildon filed Critical Huta Baildon Przedsiebiorstwo Panstwowe
Priority to AT87105124T priority Critical patent/ATE60810T1/en
Publication of EP0264528A1 publication Critical patent/EP0264528A1/en
Application granted granted Critical
Publication of EP0264528B1 publication Critical patent/EP0264528B1/en
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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
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium

Definitions

  • This invention relates to non-ledeburitic high-speed steels containing as the main alloying component tungsten and /or molybdenum.
  • the above mentioned steels can contain the following amounts of other constituents by weight: 1.2 up to 2.3 per cent of carbon, 3.0 up to 7.0 per cent of chromium, 1.0 up to 1.3 per cent of vanadium, up to 1.5 per cent of manganese, 0.2 up to 0.5 per cent of zorconium, 0.4 up to 1.5 per cent of silicon,up to 0.4 per cent of nickel, up to 0.03 per cent of sulphur, up to 0.03 per cent of phosphorus, up to 1.5 per cent of titanium and/or niobium and other elements in the form of unavoidable impurities.
  • the nature of the invention comprises to introduce in steel another steel containing by weight 6.0 to 7.0 per cent of tungsten, or 5.0 to 6.0 per cent of molybdenum, or 1.0 to 6.0 per cent of tungsten and molybdenum totally, and moreover, 1.2 up to 1.3 per cent of vanadium, up to 1.5 per cent of manganese, 0.2 up to 0.5 per cent of zirconium, 0.4 up to 1.5 per cent of silicon, up to 0.4 per cent of nickel, up to 0.03 per cent of sulphur, up to 0.03 per cent of phosphorus and some other elements in the form of unavoidable impurities, as well as 1.5 up to 6.0 per cent of titanium and niobium totally with the properly balanced carbon content acc.
  • Steels acc. to the invention contained in the casting form no carbon eutectics. Moreover, these steels does not exhibit, both after having been cast or plastic worked, any macro- or microsegregation of carbides. After final heat treatment, the structure of these steels exhibits a uniform distribution of primary carbides of titanium, niobium and zirconium, as well as secondary carbides containing mainly tungsten, molybdenum and vanadium in tempered martensite matrix and a small amount of retained austenite.

Abstract

This invention relates to non-ledeburitic high-speed steels containing tungsten and/or molybdenum as main alloying components, especially containing by weight 6.0 to 7.0 % of tungsten, or 5.0 to 6.0 % of molybdenum, or totally 1.0 to 6.0 % of tungsten and molybdenum and, moreover, 1.2 to 2.3 % of carbon, 4.0 to 7.0 % of chromium, 1.0 to 1.3 % of vanadium, up to 1.5 % of manganese, up to 4.0 % of nickel, 0.2 up to 0.5 % of zirconium, 0.4 up to 1.5 % of silicon, up to 0.03 % of sulphur, up to 0.03 per cent of phosphorus and having a total content of titanium and niobium from 1.5 up to 6.0 % and properly a balanced carbon content according to the following formula:
0.5 + 0.2 [% Ti + % Nb + % Zr + (% V - 1)] <% C <0.65 + 0.26 [% Ti + % Nb + % Zr + (% V - 1)].

Description

  • This invention relates to non-ledeburitic high-speed steels containing as the main alloying component tungsten and /or molybdenum.
  • Those skilled in the art know from FRG Patent Specification No. 2,846,889 high-speed tungsten steel containing 6.0 to 7.0 per cent of tungsten by weight, and from FRG Patent Specification No. 2,937,724 high-speed molybdenum steel containing 5.0 to 6.0 per cent of molybdenum by weight and , finally, from the USSR Patent Specification No. 3,322,988 high-speed tungsten-molybdenum steel containing totally 1.0 to 6.0 per cent of tungsten and molybdenum. It is also well known that the above mentioned steels can contain the following amounts of other constituents by weight: 1.2 up to 2.3 per cent of carbon, 3.0 up to 7.0 per cent of chromium, 1.0 up to 1.3 per cent of vanadium, up to 1.5 per cent of manganese, 0.2 up to 0.5 per cent of zorconium, 0.4 up to 1.5 per cent of silicon,up to 0.4 per cent of nickel, up to 0.03 per cent of sulphur, up to 0.03 per cent of phosphorus, up to 1.5 per cent of titanium and/or niobium and other elements in the form of unavoidable impurities.
  • These steel after having been cast exhibit ledeburitic structure and after plastic working a considerable microsegregation of carbides which leads to deformation and cracking of tools during heat treatment and strongly varying usefulness.
  • These undesirable phenomena encountered in the above mentioned steels are caused by improperly chosen contents of alloying elements.Thus, if the content of tungsten, molybdenum and vanadium is insufficient and does not correspond to the limiting solubility of these elements in martensite,no secondary hardness is observed during tempering process and the required hardness greater than 62 HRC cannot be obtained. On the other hand, the required chromium content is essential for ensuring the desired considerable hardening capacity.An improper amount of niobium and titanium in the afore mentioned steels leads in effect to the appearance of a pseudo-binary eutectic in the structure. If carbon content is not good then the required hardening capacity cannot be obtained.
  • The nature of the invention comprises to introduce in steel another steel containing by weight 6.0 to 7.0 per cent of tungsten, or 5.0 to 6.0 per cent of molybdenum, or 1.0 to 6.0 per cent of tungsten and molybdenum totally, and moreover, 1.2 up to 1.3 per cent of vanadium, up to 1.5 per cent of manganese, 0.2 up to 0.5 per cent of zirconium, 0.4 up to 1.5 per cent of silicon, up to 0.4 per cent of nickel, up to 0.03 per cent of sulphur, up to 0.03 per cent of phosphorus and some other elements in the form of unavoidable impurities, as well as 1.5 up to 6.0 per cent of titanium and niobium totally with the properly balanced carbon content acc. to the following formula:
    0.5 + 0.2 [% Ti + % Nb + % Zr + (% V - 1)] < % C <0.65 + 0.26 [% Ti + % Nb + % Zr + (% V - 1)].
  • Steels acc. to the invention contained in the casting form no carbon eutectics. Moreover, these steels does not exhibit, both after having been cast or plastic worked, any macro- or microsegregation of carbides. After final heat treatment, the structure of these steels exhibits a uniform distribution of primary carbides of titanium, niobium and zirconium, as well as secondary carbides containing mainly tungsten, molybdenum and vanadium in tempered martensite matrix and a small amount of retained austenite.
  • If an alloy with a carbon content smaller than that given on the left hand side of the presented inequality is produced, then the matrix of that alloy will contain a stable ferrite. Such an alloy cannot attain high enough hardness exceeding 62 HRC and cannot be treated as high-speed steel.
  • If an alloy with a carbon content greater than that on the right-hand side of the presented inequality has been produ hen its structure will contain a considerable amount of carbon eutectics with molybdenum and tungsten carbides. It will exhibit both macro- as well as microsegregation of carbides.
    Figure imgb0001

Claims (7)

1. A process for producing non-ledeburitic high-speed tungsten steel containing by weight 1.2 to 2.3 % of carbon, 4.0 to 7.0 % of chromium, 6.0 to 7.0 % of tungsten, 1.0 to 1.3 % of vanadium, up to 1.5 % of manganese, 0.2 to 0.5 % of zirconium, 0.4 to 1.5 % of silicon, up to 0.4 % of nickel, up to 0.03 % of sulphur, up to 0.03 % of phosphorus, characterized in that totally 1.5 to 6.0 % of titanium and niobium are added.
2. The process according to claim 1, characterized in that the non-ledeburitic high-speed tungsten steel has a properly ballanced carbon content according to the inequality:
0.5 + 0.2 [% Ti + % Nb + % Zr + (% V - 1)] <% C <0.65 + 0.26 [% Ti + % Nb + % Zr + (% V - 1)].
3. A process for the production of a non-ledeburitic molybdenym high-speed steel containing by weight 1.2 to 2.3 % of carbon, 4.0 to 7.0 % of molybdenum, 1.0 to 1.3 % of vanadium, up to 1.5 % of manganese, 0.2 to 0.5 % of zirconium, 0.4 to 1.5 % of silicon, up to 0.4 % of nickeL, up to 0.03 % of sulphur, up to 0.03 % of phosphorus, characterized in that totally 1.5 to 6.0 % of titanium and niobium are added.
4. The process according to claim 3, characterized in that the non-ledeburitic high-speed steel has a properly ballanced carbon content according to the following inequality:
0.5 + 0.2 [% Ti + % Nb + % Zr + (% V - 1)] <% C <0.65 + 0.26 [% Ti + % Nb + % Zr + (% V - 1)].
5. A process for the production of non-lede gh-speed steel containing by weight 1.2 to 2.3 % of carbon, 4.0 to 7.0 % of chromium, 1.0 to 6.0 % of tungsten and molybdenum, 1.0 to 1.3 % of vanadium, up to 1.5 % of manganese, 0.2 up to 0.5 % of zirconium, 0.4 up to 1.5 % of silicon, up to 0.4 % of nickel, up to 0.03 % of phosphorus, characterized in that totally by weight 1.5 to 6.0 % of titanium and niobium are added.
6. A process according to claim 5, characterized in that the non-ledeburitic high-speed steel has a properly ballanced carbon content according to the following inequality:
0.5 + 0.2 [% Ti + % Nb + % Zr + (% V - 1)] <% C <0.65 + 0.26 [% Ti + % Nb + % Zr + (% V - 1)].
EP87105124A 1986-09-15 1987-04-07 Non-ledeburitic high speed steels Expired - Lifetime EP0264528B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105124T ATE60810T1 (en) 1986-09-15 1987-04-07 NON-LEDEBURITIC HIGH CUT STEELS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL261399 1986-09-15
PL1986261399A PL261399A3 (en) 1986-09-15 1986-09-15 Economic nonledeburitic high-speed steels

Publications (2)

Publication Number Publication Date
EP0264528A1 true EP0264528A1 (en) 1988-04-27
EP0264528B1 EP0264528B1 (en) 1991-02-06

Family

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Family Applications (1)

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EP87105124A Expired - Lifetime EP0264528B1 (en) 1986-09-15 1987-04-07 Non-ledeburitic high speed steels

Country Status (4)

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EP (1) EP0264528B1 (en)
AT (1) ATE60810T1 (en)
DE (1) DE3767961D1 (en)
PL (1) PL261399A3 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903429A1 (en) * 1988-02-15 1989-08-24 Boehler Ag High-speed steel alloy, method for producing it, and use thereof
GB2301116A (en) * 1995-05-25 1996-11-27 Winsert Inc Iron base alloys for internal combustion engine valve seat inserts and the like
EP0903420A2 (en) * 1997-09-17 1999-03-24 Latrobe Steel Company Cobalt free high speed steels
US7611590B2 (en) 2004-07-08 2009-11-03 Alloy Technology Solutions, Inc. Wear resistant alloy for valve seat insert used in internal combustion engines
US7754142B2 (en) 2007-04-13 2010-07-13 Winsert, Inc. Acid resistant austenitic alloy for valve seat inserts

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367770A (en) * 1965-02-01 1968-02-06 Latrobe Steel Co Ferrous alloys and abrasion resistant articles thereof
DE1271409B (en) * 1961-12-28 1968-06-27 Fujikoshi Kozai Kogyo Kabushik High speed steel containing titanium and tantalum
US3692515A (en) * 1968-07-30 1972-09-19 Latrobe Steel Co Ferrous alloys and abrasion resistant articles thereof
US4116684A (en) * 1976-03-17 1978-09-26 Hitachi Metals, Ltd. High speed tool steel having high toughness
EP0105861A1 (en) * 1982-09-14 1984-04-18 Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) High speed steel alloy

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU823450A1 (en) * 1979-07-31 1981-04-23 Краматорский Научно-Исследовательскийи Проектно-Технологический Институтмашиностроения High-speed steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271409B (en) * 1961-12-28 1968-06-27 Fujikoshi Kozai Kogyo Kabushik High speed steel containing titanium and tantalum
US3367770A (en) * 1965-02-01 1968-02-06 Latrobe Steel Co Ferrous alloys and abrasion resistant articles thereof
US3692515A (en) * 1968-07-30 1972-09-19 Latrobe Steel Co Ferrous alloys and abrasion resistant articles thereof
US4116684A (en) * 1976-03-17 1978-09-26 Hitachi Metals, Ltd. High speed tool steel having high toughness
EP0105861A1 (en) * 1982-09-14 1984-04-18 Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) High speed steel alloy

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903429A1 (en) * 1988-02-15 1989-08-24 Boehler Ag High-speed steel alloy, method for producing it, and use thereof
GB2301116A (en) * 1995-05-25 1996-11-27 Winsert Inc Iron base alloys for internal combustion engine valve seat inserts and the like
US5674449A (en) * 1995-05-25 1997-10-07 Winsert, Inc. Iron base alloys for internal combustion engine valve seat inserts, and the like
GB2301116B (en) * 1995-05-25 1998-09-16 Winsert Inc Iron base alloys for internal combustion engine valve seat inserts and the like
EP0903420A2 (en) * 1997-09-17 1999-03-24 Latrobe Steel Company Cobalt free high speed steels
EP0903420A3 (en) * 1997-09-17 1999-12-15 Latrobe Steel Company Cobalt free high speed steels
US6200528B1 (en) 1997-09-17 2001-03-13 Latrobe Steel Company Cobalt free high speed steels
US7611590B2 (en) 2004-07-08 2009-11-03 Alloy Technology Solutions, Inc. Wear resistant alloy for valve seat insert used in internal combustion engines
US7754142B2 (en) 2007-04-13 2010-07-13 Winsert, Inc. Acid resistant austenitic alloy for valve seat inserts

Also Published As

Publication number Publication date
DE3767961D1 (en) 1991-03-14
EP0264528B1 (en) 1991-02-06
ATE60810T1 (en) 1991-02-15
PL261399A3 (en) 1988-08-18

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