CA2497760A1 - A machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same - Google Patents

A machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same Download PDF

Info

Publication number
CA2497760A1
CA2497760A1 CA002497760A CA2497760A CA2497760A1 CA 2497760 A1 CA2497760 A1 CA 2497760A1 CA 002497760 A CA002497760 A CA 002497760A CA 2497760 A CA2497760 A CA 2497760A CA 2497760 A1 CA2497760 A1 CA 2497760A1
Authority
CA
Canada
Prior art keywords
microstructure
austempering
cast iron
plus austenitic
ferritic plus
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
CA002497760A
Other languages
French (fr)
Other versions
CA2497760C (en
Inventor
Alan Peter Druschitz
David Carroll Fitzgerald
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.)
Intermet Corp
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2497760A1 publication Critical patent/CA2497760A1/en
Application granted granted Critical
Publication of CA2497760C publication Critical patent/CA2497760C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/607—Molten salts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts

Abstract

A machinable austempered cast iron article has improved strength, machinability, fatigue performance, and resistance to environmental cracking . A method of making the machinable austempered cast iron article includes austenitizing an iron composition having a substantially pearlitic microstructure in an intercritical temperature range of between 1380~F and 1500 ~F. This produces a ferritic plus austenitic microstructure. The ferrit ic plus austenitic microstructure is quenched into an austempering temperature range of between 575 ~F and 750 ~F within 3 minutes to prevent formation of pearlite. The ferritic plus austenitic microstructure is then austempered in the austempering temperature range of between 575 ~F and 750 ~F to produce a microstructure of a continuous matrix of equiaxed ferrite with islands of austenite. Finally, the microstructure of the continuous matrix of equiaxed ferrite with islands of austenite is cooled to ambient temperature to produc e the machinable austempered cast iron article.

Claims (36)

1. A method of making a machinable austempered cast iron article from an iron composition having a substantially pearlitic microstructure that includes carbon, silicon, nickel, copper, and molybdenum, said method comprising the steps of:
austenitizing the substantially pearlitic microstructure in an intercritical temperature range of from 1380°F to 1500°F for a period of at least 10 minutes to produce a ferritic plus austenitic microstructure;
quenching the ferritic plus austenitic microstructure at a rate sufficient to prevent formation of pearlite;
austempering the ferritic plus austenitic microstructure in an austempering temperature range of from 575°F to 750°F for a period of at least 8 minutes to produce a microstructure of a continuous matrix of equiaxed ferrite with islands of austenite; and cooling the microstructure of the continuous matrix of equiaxed ferrite with islands of austenite to ambient temperature to produce the machinable austempered cast iron article having improved strength, ductility, machinability, fatigue performance, and resistance to environmental cracking.
2. A method according to claim 1 further comprising the step of casting the iron composition to produce the substantially pearlitic microstructure having at least 80% pearlite prior to austenitizing.
3. A method according to claim 1 wherein the step of austenitizing the substantially pearlitic microstructure is further defined as austenitizing the substantially pearlitic microstructure in an intercritical temperature range of from 1380°F to 1472°F.
4. A method according to claim 1 wherein the step of austenitizing the substantially pearlitic microstructure is further defined as austenitizing the substantially pearlitic microstructure in an intercritical temperature range of from 1380°F to 1449°F.
5. A method according to claim 1 wherein the step of austenitizing the substantially pearlitic microstructure is further defined as austenitizing the substantially pearlitic microstructure for a period of from 10 to 360 minutes.
6. A method according to claim 1 wherein the step of austempering the ferritic plus austenitic microstructure is further defined as austempering the ferritic plus austenitic microstructure for a period of from 8 to 1440 minutes.
7. A method according to claim 6 wherein the step of austempering the ferritic plus austenitic microstructure is further defined as austempering the ferritic plus austenitic microstructure for a period of from 60 minutes to 180 minutes.
8. A method according to claim 1 wherein the step of quenching the ferritic plus austenitic microstructure is further defined as quenching the ferritic plus austenitic microstructure into the austempering temperature range of from 575°F to 750°F within a period of from 5 to 180 seconds to prevent the formation of pearlite.
9. A method according to claim 1 wherein the step of quenching the ferritic plus austenitic microstructure is further defined as quenching the ferritic plus austenitic microstructure into the austempering temperature range in a salt bath.
10. A method according to claim 9 wherein the salt bath comprises at least one of nitrate salts, nitrite salts, and combinations thereof.
11. A method according to claim 1 wherein the step of quenching the ferritic plus austenitic microstructure is further defined as quenching the ferritic plus austenitic microstructure into the austempering temperature range in a fluidized bed.
12. A method according to claim 1 wherein the step of cooling the microstructure of the continuous matrix of equiaxed ferrite with islands of austenite to ambient temperature is further defined as cooling the microstructure of the continuous matrix of equiaxed ferrite with islands of austenite to ambient temperature in at least one of air, oil, and water.
13. A method according to claim 1 wherein the machinable austempered cast iron article is a crankshaft component.
14. A method according to claim 1 wherein the machinable austempered cast iron article is a chassis component.
15. A method of making a machinable austempered cast iron article from an iron composition that includes carbon, silicon, nickel, copper, and molybdenum, said method comprising the steps of:
casting the iron composition at a temperature of greater than 2200°F;
cooling the iron composition to a temperature of from 1000°F to 1340°F;
holding the iron composition at the temperature of from 1000°F to 1340°F for at least 8 seconds to produce a substantially pearlitic microstructure;
cooling the iron composition to an ambient temperature;
austenitizing the substantially pearlitic microstructure in an intercritical temperature range of from 1380°F to 1500°F for a period of at least 10 minutes to produce a ferritic plus austenitic microstructure;
quenching the ferritic plus austenitic microstructure at a rate sufficient to prevent formation of pearlite;
austempering the ferritic plus austenitic microstructure in an austempering temperature range of from 575°F to 750°F for a period of at least 8 minutes to produce a microstructure of a continuous matrix of equiaxed ferrite with islands of austenite; and cooling the microstructure of the continuous matrix of equiaxed ferrite with islands of austenite to ambient temperature to produce the machinable austempered cast iron article having improved strength, machinability, fatigue performance, and resistance to environmental cracking.
16. A method according to claim 15 wherein the step of austenitizing the substantially pearlitic microstructure is further defined as austenitizing the substantially pearlitic microstructure having at least 80% pearlite in an intercritical temperature range of from 1380°F
to 1472°F.
17. A method according to claim 15 wherein the step of austenitizing the substantially pearlitic microstructure is further defined as austenitizing the substantially pearlitic microstructure having at least 80% pearlite in an intercritical temperature range of from 1380°F
to 1449°F.
18. A method according to claim 15 wherein the step of austenitizing the substantially pearlitic microstructure is further defined as austenitizing the substantially pearlitic microstructure for a period of from 10 to 360 minutes.
19. A method according to claim 15 wherein the step of austempering the ferritic plus austenitic microstructure is further defined as austempering the ferritic plus austenitic microstructure for a period of from 8 to 1440 minutes.
20. A method according to claim 19 wherein the step of austempering the ferritic plus austenitic microstructure is further defined as austempering the ferritic plus austenitic microstructure for a period of from 60 minutes to 180 minutes.
21. A method according to claim 15 wherein the step of quenching the ferritic plus austenitic microstructure is further defined as quenching the ferritic plus austenitic microstructure into the austempering temperature range of from 575°F to 750°F within a period of from 5 to 180 seconds to prevent the formation of pearlite.
22. A method according to claim 15 wherein the step of quenching the ferritic plus austenitic microstructure is further defined as quenching the ferritic plus austenitic microstructure into the austempering temperature range in a salt bath.
23. A method according to claim 22 wherein the salt bath comprises at least one of nitrate salts, nitrite salts, and combinations thereof.
24. A method according to claim 15 wherein the step of quenching the ferritic plus austenitic microstructure is further defined as quenching the ferritic plus austenitic microstructure into the austempering temperature range in a fluidized bed.
25. A method according to claim 15 wherein the step of cooling the microstructure of the continuous matrix of equiaxed ferrite with islands of austenite to ambient temperature is further defined as cooling the microstructure of the continuous matrix of equiaxed ferrite with islands of austenite to ambient temperature in at least one of air, oil, and water.
26. A method according to claim 15 wherein the machinable austempered cast iron article is a crankshaft component.
27. A method according to claim 15 wherein the machinable austempered cast iron article is a chassis component.
28. A machinable austempered cast iron article, said article made by the steps of:
austenitizing an iron composition having a substantially pearlitic microstructure in an intercritical temperature range of from 1380°F to 1500°F for a period of at least 10 minutes to produce a ferritic plus austenitic microstructure;
quenching the ferritic plus austenitic microstructure at a rate sufficient to prevent the formation of pearlite;
austempering said ferritic plus austenitic microstructure in an austempering temperature range of from 575°F to 750°F for a period of at least 8 minutes to produce a microstructure of a continuous matrix of equiaxed ferrite with islands of austenite; and cooling said microstructure of said continuous matrix of equiaxed ferrite with islands of austenite to ambient temperature to produce said machinable austempered cast iron article having improved strength, machinability, ductility, fatigue performance, and resistance to environmental cracking.
29. A machinable austempered cast iron article as set forth in claim 28 wherein said substantially pearlitic microstructure includes at least 80% pearlite.
30. A machinable austempered cast iron article as set forth in claim 28 comprising, by weight, 3.3-3.9% carbon, 1.90-2.70% silicon, 0.45-2.05% nickel, 0.55-1.05%
copper, 0-0.20%
molybdenum, and a remainder of iron.
31. A machinable austempered cast iron article as set forth in claim 30 wherein said article has a Brinell hardness of between 180 and 340 BHN.
32. A machinable austempered cast iron article as set forth in claim 31 wherein said article has a yield strength of between 50,000 and 125,000 psi.
33. A machinable austempered cast iron article as set forth in claim 32 wherein said article has an ultimate tensile strength of between 70,000 and 170,000 psi.
34. A machinable austempered cast iron article as set forth in claim 33 wherein said article has an elongation of between 14% and 22%.
35. A machinable austempered cast iron composition, said composition comprising, by weight, 3.3-3.9% carbon, 1.90-2.70% silicon, 0.45-2.05% nickel, 0.55-1.05%
copper, 0-0.20% molybdenum, and a remainder of iron, said composition characterized by a microstructure of a continuous matrix of equiaxed ferrite with islands of austenite to provide said composition with improved strength, machinability, ductility, fatigue performance, and resistance to environmental cracking.
36. A machinable austempered cast iron composition as set forth in claim 35 comprising, by weight, 3.7% carbon, 2.5% silicon, 1.85% nickel, 0.85% copper, 0.05%
molybdenum, and a remainder of iron.
CA002497760A 2002-09-04 2003-08-29 A machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same Expired - Fee Related CA2497760C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US40817402P 2002-09-04 2002-09-04
US60/408,174 2002-09-04
PCT/US2003/027198 WO2004022792A2 (en) 2002-09-04 2003-08-29 Austempered cast iron article and a method of making the same

Publications (2)

Publication Number Publication Date
CA2497760A1 true CA2497760A1 (en) 2004-03-18
CA2497760C CA2497760C (en) 2009-12-22

Family

ID=31978571

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002497760A Expired - Fee Related CA2497760C (en) 2002-09-04 2003-08-29 A machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same

Country Status (6)

Country Link
US (2) US7070666B2 (en)
EP (1) EP1534867A2 (en)
CN (1) CN100398672C (en)
CA (1) CA2497760C (en)
MX (1) MXPA05002433A (en)
WO (1) WO2004022792A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109109592A (en) * 2018-11-13 2019-01-01 宁夏众信机械设备制造有限公司 A kind of automobile torsion bar and its manufacture craft

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10344073A1 (en) * 2003-09-23 2005-04-28 Daimler Chrysler Ag Crankshaft with combined drive gear and process for their preparation and their use
DE102004056331A1 (en) * 2004-11-22 2006-05-24 Georg Fischer Fahrzeugtechnik Ag Ductile cast iron alloy and method for producing castings from nodular cast iron alloy
US8637127B2 (en) 2005-06-27 2014-01-28 Kennametal Inc. Composite article with coolant channels and tool fabrication method
US7687156B2 (en) 2005-08-18 2010-03-30 Tdy Industries, Inc. Composite cutting inserts and methods of making the same
RU2432445C2 (en) 2006-04-27 2011-10-27 Ти Ди Уай Индастриз, Инк. Modular drill bit with fixed cutting elements, body of this modular drill bit and methods of their manufacturing
ITVR20060111A1 (en) * 2006-07-03 2008-01-04 Zanardi Fonderie S P A PROCEDURE FOR THE PRODUCTION OF MECHANICAL COMPONENTS IN SFEROID CAST IRON
WO2008051588A2 (en) 2006-10-25 2008-05-02 Tdy Industries, Inc. Articles having improved resistance to thermal cracking
SE531107C2 (en) * 2006-12-16 2008-12-23 Indexator Ab Method
US8512882B2 (en) 2007-02-19 2013-08-20 TDY Industries, LLC Carbide cutting insert
US7846551B2 (en) 2007-03-16 2010-12-07 Tdy Industries, Inc. Composite articles
RU2458178C2 (en) 2007-11-29 2012-08-10 ЭйТиАй ПРОПЕРТИЗ, ИНК. Sparingly alloyed austenitic stainless steel
US8337749B2 (en) 2007-12-20 2012-12-25 Ati Properties, Inc. Lean austenitic stainless steel
ES2394980T3 (en) * 2007-12-20 2013-02-07 Ati Properties, Inc. Austenitic stainless steel low in nickel containing stabilizing elements
RU2450080C2 (en) * 2007-12-20 2012-05-10 ЭйТиАй ПРОПЕРТИЗ, ИНК. Sparingly alloyed corrosion-resistant austenitic stainless steel
US8790439B2 (en) 2008-06-02 2014-07-29 Kennametal Inc. Composite sintered powder metal articles
EP2300628A2 (en) 2008-06-02 2011-03-30 TDY Industries, Inc. Cemented carbide-metallic alloy composites
US8025112B2 (en) 2008-08-22 2011-09-27 Tdy Industries, Inc. Earth-boring bits and other parts including cemented carbide
US8322465B2 (en) 2008-08-22 2012-12-04 TDY Industries, LLC Earth-boring bit parts including hybrid cemented carbides and methods of making the same
DE102008050152B4 (en) 2008-10-01 2013-05-23 Claas Guss Gmbh High-strength, ductile cast iron alloy with nodular graphite and process for its production
US8272816B2 (en) 2009-05-12 2012-09-25 TDY Industries, LLC Composite cemented carbide rotary cutting tools and rotary cutting tool blanks
US8308096B2 (en) 2009-07-14 2012-11-13 TDY Industries, LLC Reinforced roll and method of making same
US20110017364A1 (en) * 2009-07-23 2011-01-27 General Electric Company Heavy austempered ductile iron components
US20110114229A1 (en) * 2009-08-20 2011-05-19 Southern Cast Products, Inc. Ausferritic Wear-Resistant Steel Castings
US8440314B2 (en) 2009-08-25 2013-05-14 TDY Industries, LLC Coated cutting tools having a platinum group metal concentration gradient and related processes
DE102009048273A1 (en) * 2009-10-05 2011-04-07 Bayerische Motoren Werke Aktiengesellschaft Cast iron casting and method of making the same
US9643236B2 (en) 2009-11-11 2017-05-09 Landis Solutions Llc Thread rolling die and method of making same
IT1400634B1 (en) * 2010-06-18 2013-06-14 Zanardi Fonderie S P A PROCEDURE FOR THE PRODUCTION OF MUSHROOM COMPONENTS IN SPIRIOUS CAST IRON AUSTEMPERATA PARTICULARLY RESISTANT TO WEAR.
US8800848B2 (en) 2011-08-31 2014-08-12 Kennametal Inc. Methods of forming wear resistant layers on metallic surfaces
US9016406B2 (en) 2011-09-22 2015-04-28 Kennametal Inc. Cutting inserts for earth-boring bits
CN104064165A (en) * 2014-07-08 2014-09-24 森鹤乐器股份有限公司 Piano mark string nut treatment method
DE102014214640A1 (en) * 2014-07-25 2016-01-28 Ford Global Technologies, Llc Method for producing a component from heat-treated cast iron
EP3088537A1 (en) 2015-04-27 2016-11-02 Georg Fischer GmbH Production method for hpi cast iron
ITUB20152456A1 (en) * 2015-07-24 2017-01-24 Zanardi Fond S P A PROCEDURE FOR THE PRODUCTION OF MECHANICAL COMPONENTS IN LAMELLAR IRON OR VERMICULAR.
CN106566976A (en) * 2016-11-10 2017-04-19 无锡市明盛强力风机有限公司 Processing technology of crankshaft material
SE545732C2 (en) * 2019-02-08 2023-12-27 Ausferritic Ab Method for producing ausferritic steel and ductile iron, austempered in rapid cycles followed by baking
CN112430774A (en) * 2020-10-27 2021-03-02 宁国东方碾磨材料股份有限公司 High-wear-resistance and high-toughness lining plate for large ball mill and preparation process thereof
US11718886B2 (en) * 2021-02-22 2023-08-08 Robert Bosch Gmbh Method for producing a brake element, brake element

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US24621A (en) * 1859-07-05 Improvement in mills for crushing cane
US3920490A (en) * 1971-08-18 1975-11-18 Ford Motor Co Thermally processed steel
US4032368A (en) * 1972-10-05 1977-06-28 United States Steel Corporation Intercritical-cycle annealing
DE2853870A1 (en) * 1978-12-13 1980-07-03 Schmidt Gmbh Karl BALL GRAPHITE CAST IRON WITH AUSTENITIC-BAINITIC MIXED TEXTURE
US4222793A (en) * 1979-03-06 1980-09-16 General Motors Corporation High stress nodular iron gears and method of making same
US4432812A (en) * 1980-04-21 1984-02-21 Caterpillar Tractor Co. Drive train gear of lower bainite alloy steel
ES492353A0 (en) 1980-06-12 1981-04-01 Muhlberger Horst PROCEDURE FOR THE MANUFACTURE OF CAST IRON
US4541878A (en) * 1982-12-02 1985-09-17 Horst Muhlberger Cast iron with spheroidal graphite and austenitic-bainitic mixed structure
US4484953A (en) * 1983-01-24 1984-11-27 Ford Motor Company Method of making ductile cast iron with improved strength
US4596606A (en) * 1984-09-04 1986-06-24 Ford Motor Company Method of making CG iron
US4737199A (en) * 1985-12-23 1988-04-12 Ford Motor Company Machinable ductile or semiductile cast iron and method
CN86107204A (en) * 1986-10-15 1988-05-04 北京市机电研究院铸造研究所 The high-frequency isothermic quenching of spheroidal graphite cast iron
US4838956A (en) * 1987-04-16 1989-06-13 Mazda Motor Corporation Method of producing a spheroidal graphite cast iron
US5028281A (en) * 1988-06-14 1991-07-02 Textron, Inc. Camshaft
US4880477A (en) * 1988-06-14 1989-11-14 Textron, Inc. Process of making an austempered ductile iron article
US5268044A (en) * 1990-02-06 1993-12-07 Carpenter Technology Corporation High strength, high fracture toughness alloy
US5139579A (en) * 1990-04-27 1992-08-18 Applied Process Method for preparing high silicon, low carbon austempered cast iron
US5180450A (en) * 1990-06-05 1993-01-19 Ferrous Wheel Group Inc. High performance high strength low alloy wrought steel
US5082507A (en) * 1990-10-26 1992-01-21 Curry Gregory T Austempered ductile iron gear and method of making it
US5352304A (en) * 1992-11-16 1994-10-04 Allegheny Ludlum Corporation High strength low alloy steel
JP3691913B2 (en) * 1996-09-05 2005-09-07 株式会社東芝 Polishing tool material and polishing surface plate using the same
US5849114A (en) * 1997-02-17 1998-12-15 Applied Process, Inc. Method of forming plate-type track shoe
JP3577411B2 (en) * 1997-05-12 2004-10-13 新日本製鐵株式会社 High toughness spring steel
JPH11140585A (en) * 1997-09-05 1999-05-25 Timken Co:The Heat treated steel having optimum toughness
US5837069A (en) * 1997-09-16 1998-11-17 Weyburn-Bartel Inc. Cast iron components and method of making
US6258180B1 (en) * 1999-05-28 2001-07-10 Waupaca Foundry, Inc. Wear resistant ductile iron
SE515623C2 (en) 2000-02-14 2001-09-10 Ovako Steel Ab chains Steel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109109592A (en) * 2018-11-13 2019-01-01 宁夏众信机械设备制造有限公司 A kind of automobile torsion bar and its manufacture craft
CN109109592B (en) * 2018-11-13 2024-02-20 浙江锐泰悬挂系统科技有限公司 Automobile torsion bar and manufacturing process thereof

Also Published As

Publication number Publication date
WO2004022792A3 (en) 2004-06-17
US7497915B2 (en) 2009-03-03
US20060157160A1 (en) 2006-07-20
CA2497760C (en) 2009-12-22
CN100398672C (en) 2008-07-02
WO2004022792A2 (en) 2004-03-18
CN1688723A (en) 2005-10-26
US7070666B2 (en) 2006-07-04
EP1534867A2 (en) 2005-06-01
MXPA05002433A (en) 2005-05-27
US20040112479A1 (en) 2004-06-17

Similar Documents

Publication Publication Date Title
CA2497760A1 (en) A machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same
CN106947912B (en) A kind of austempering ductile iron and its casting method
US8858736B2 (en) Austempered ductile iron, method for producing this and component comprising this iron
CN102108433B (en) Method for quenching bearing steel
ATE346960T1 (en) MANUFACTURING PROCESS FOR ULTRA-HIGH-STRENGTH, WELDABLE STEELS WITH EXCELLENT TOUGHNESS
US10787718B2 (en) Material, method and component
CN104911466B (en) Ultra-high-strength multiphase-structure gray cast iron cylinder jacket and preparation method thereof
CN103088251B (en) A kind of spheroidal graphite cast iron and heat treating method thereof
US4737199A (en) Machinable ductile or semiductile cast iron and method
CN103205544B (en) Salt-bath self-heating two-stage isothermal quenching method of nodular cast irons, and austempered ductile iron prepared by using method
CN105568165A (en) High-strength and high-tenacity low-alloy wear-resistant steel and preparing method thereof
CA1244323A (en) Hardenable cast iron
CN113337694B (en) Spheroidizing annealing heat treatment method for ultrahigh-carbon bearing steel
CN101624684B (en) Carburizing bainite steel and manufacturing method thereof
KR100501087B1 (en) A hydraulic breaker housing and manufacturing method thereof
KR100650153B1 (en) Treatment method of austemperring
CN113584267A (en) Dynamic isothermal treatment method for high-carbon nano bainite steel structure
KR20090056195A (en) Forging steel using high frequency heat treatment and method for manufacturing the same
Sarkar et al. Effect of the Time and Temperature of Isothermal Quenching on Microstructure and Mechanical Properties of Bainitic Gray Cast Iron
CN108467997A (en) The precipitation enhancement type ferritic steel and production method that a kind of yield strength is 1100MPa grades
KR200371777Y1 (en) A hydraulic breaker housing, having hydraulic breaker thereof
Panda Effect of copper on austempering behavior of ductile iron
CN1760380A (en) A sort of austempering technique for austenitic spheroidal graphite cast iron
Hayrynen Heat Treating and Properties of Ductile Iron
Hayrynen Heat Treatment of Ductile Iron

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed