EP1876255B1 - Carbonitriding or cementation steel and method of producing parts with said steel - Google Patents

Carbonitriding or cementation steel and method of producing parts with said steel Download PDF

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Publication number
EP1876255B1
EP1876255B1 EP05742610A EP05742610A EP1876255B1 EP 1876255 B1 EP1876255 B1 EP 1876255B1 EP 05742610 A EP05742610 A EP 05742610A EP 05742610 A EP05742610 A EP 05742610A EP 1876255 B1 EP1876255 B1 EP 1876255B1
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EP
European Patent Office
Prior art keywords
steel
steels
carbonitriding
parts
carburized
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.)
Active
Application number
EP05742610A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1876255A1 (en
Inventor
Jacinto J. Albarran Sanz
Roberto Elvira Eguizabal
Maria Carmen Montero Pascual
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.)
Gerdau Investigacion y Desarrollo Europa SA
Original Assignee
Sidenor Investigacion y Desarrollo SA
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Publication date
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Publication of EP1876255A1 publication Critical patent/EP1876255A1/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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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

Definitions

  • the present invention relates to a carburized or carbonitrided steel material and to the process of obtaining parts from this material.
  • An object of the invention is a carburized or carbonitrided steel having a composition such that it allows increasing its hardenability and minimizing deformations when an area of its surface is subjected to a hardening treatment by carburizing or carbonitriding followed by quenching in a non-severe medium.
  • Another object of the invention is the process of obtaining a mechanical part from this starting steel.
  • Carburizing represents one of the most common surface thermal treatments conducted with metallic materials and is particularly applicable in automotive parts in transmission elements such as steering and the gear box.
  • the large amount of frictions generated during their operation mean that the surfaces of these parts must be hard and have a high resistance to wear, in addition to incorporating a tenacious core to resist mechanical shocks occurring during service.
  • parts manufactured with carburized steel are normally used.
  • Carburized steels have a carbon content between 0.15% and 0.30% by weight and alloy elements such as manganese, chromium, nickel and molybdenum, among others, which aid in obtaining the final features required of the parts.
  • the carburized steels most commonly used in manufacturing components intended for the automotive industry are steels alloyed with Cr, MnCr, MoCr, NiCr, CrNi, NiCrMo, CrNiMo.
  • the steel is subjected to a carburizing process increasing the C content in its surface layer until reaching values comprised between 0.8 and 1 % C.
  • the carburizing process is carried out at a high temperature in a controlled gas atmosphere. After the carburizing process, the periphery of the part may be relatively soft despite the high C content and the core may show brittleness due to having a coarse structure, so it is therefore necessary to then subject the part to a quenching process.
  • the parts are cooled in the quenching process from the carburizing temperature to room temperature at a cooling rate ensuring the transformation of the austenite in the final structure required by the steel.
  • Cooling with gas means that the temperature gradients in the part are more homogenous than those that are reached using oil, which implies a reduction of deformations caused by heat.
  • the gas used as a quenching fluid may have a lower cooling capacity than oil, which implies that the obtained steel part will have a lower strength.
  • the pressure of the gas is increased to increase the cooling capacity thereof, however excess pressure may cause a higher number of final deformations in the parts.
  • Invention patent EP 0 890 653 relates to a process of manufacturing carburized or carbonitrided steel parts and to the steel for manufacturing said part.
  • This steel is conceived to obtain a high degree of hardness in the surface of the part obtained after the thermal treatment and to improve the mechanical features of the core, aiming to prevent deformations that may lead to the part being rejected or to the need to carry out supplementary machining.
  • a specific composition of the starting steel is proposed in which C is found at a by weight percentage between 0.2 and 0.26 and other components including, among others, Si, P, S, Mn, Cr, Ni, Mo, Al, Cu, Ti.
  • the patent application EP 0 725 156 A discloses a process for manufacturing a component made of a weldable steel having a high tensile strength and a good ductility.
  • a specific composition of the starting steel is proposed which comprises, by weight, from 0.15 to 0.35% of C and other components including, among others, Si, Al, Mn, Ni, Cr, W, Mo, V and Nb.
  • the patent application ES 2 013 007 A relates to a steel intended for manufacturing highly stressed structural members with high demands for ductility and fatigue resistance; said steel having a carbon content adjusted for the purpose for which it is to be used and molybdenum as the only intentional alloying additive.
  • the steel has a carbon content suitably lying within the interval 0.10 to 1.15% and a molybdenum content suitably lying within the interval 0.2 to 1.0%.
  • the content of other alloying materials normally used, such as Si, Mn, Cr, Ni, V and W is limited to the smallest normal level for the industrial manufacturing process applicable to the steel. That is, these other alloying materials shall be present in quantities not greater than the typical ones for residual contents for the industrial manufacturing process being used for the steel in question.
  • the properties of the parts obtained by the described thermal treatments can be optimized by means of using a starting steel such as the one proposed by the invention described below.
  • Parts having a particular geometry with a dimension sensitive to deformations have been manufactured from a series of steels having a different composition.
  • the percentage composition by weight of the starting steels is shown in the following table, in which it can be verified that steel E has a chemical composition within the preferred range proposed by the invention.
  • Steel E which has the combination of elements within the range object of the invention ensures in the parts manufactured according to the process object of the invention reducing deformations after the treatment and obtaining the required mechanical demands, as well as a homogenous structure in the part and a uniform and repetitive performance of the material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

Se contempla la incorporación del vanadio en cantidades menores a 0,15 % en peso en un acero de cementación o carbonitruración. Esta adición junto con una composición concreta del resto de elementos contribuye a elevar la templabilidad del acero y a minimizar deformaciones cuando una zona de la superficie de una pieza para cuya fabricación se ha seleccionado dicho acero es sometida a un tratamiento de endurecimiento por cementación o carbonitruración seguido de temple en un medio poco severo.
EP05742610A 2005-04-26 2005-04-26 Carbonitriding or cementation steel and method of producing parts with said steel Active EP1876255B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2005/000217 WO2006114453A1 (es) 2005-04-26 2005-04-26 Acero de cementación o carbonitruración y procedimiento de fabricación de piezas a partir de ese acero

Publications (2)

Publication Number Publication Date
EP1876255A1 EP1876255A1 (en) 2008-01-09
EP1876255B1 true EP1876255B1 (en) 2012-06-06

Family

ID=37214425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05742610A Active EP1876255B1 (en) 2005-04-26 2005-04-26 Carbonitriding or cementation steel and method of producing parts with said steel

Country Status (3)

Country Link
EP (1) EP1876255B1 (es)
ES (1) ES2392286T3 (es)
WO (1) WO2006114453A1 (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2561558C1 (ru) * 2014-09-15 2015-08-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Уральский государственный университет" (национальный исследовательский университет) (ФГБОУ ВПО "ЮУрГУ" (НИУ)) Легкообрабатываемая конструкционная хромомарганцевоникелевая сталь
RU2570601C1 (ru) * 2014-09-15 2015-12-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Уральский государственный университет" (национальный исследовательский университет) (ФГБОУ ВПО "ЮУрГУ" (НИУ)) Легкообрабатываемая конструкционная хромоникелевая сталь
CN109898023A (zh) * 2019-04-16 2019-06-18 柳州市创科复合金属陶瓷制品有限公司 板坯连铸辊轴承座及其制造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5761105B2 (ja) * 2012-04-02 2015-08-12 新日鐵住金株式会社 冷鍛窒化用鋼、冷鍛窒化用鋼材および冷鍛窒化部品

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8800411L (sv) 1988-02-09 1989-08-10 Ovako Steel Ab Staal avsedda foer hoegt paakaenda konstruktionselement med stora krav paa formbarhet och utmattningshaallfasthet samt anvaendning daerav
FR2729974B1 (fr) 1995-01-31 1997-02-28 Creusot Loire Acier a haute ductilite, procede de fabrication et utilisation
FR2765890B1 (fr) 1997-07-10 1999-08-20 Ascometal Sa Procede de fabrication d'une piece mecanique en acier cementee ou carbonitruree et acier pour la fabrication de cette piece
JP4023106B2 (ja) * 2001-05-09 2007-12-19 住友金属工業株式会社 溶接熱影響部軟化の小さいフェライト系耐熱鋼

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2561558C1 (ru) * 2014-09-15 2015-08-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Уральский государственный университет" (национальный исследовательский университет) (ФГБОУ ВПО "ЮУрГУ" (НИУ)) Легкообрабатываемая конструкционная хромомарганцевоникелевая сталь
RU2570601C1 (ru) * 2014-09-15 2015-12-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Уральский государственный университет" (национальный исследовательский университет) (ФГБОУ ВПО "ЮУрГУ" (НИУ)) Легкообрабатываемая конструкционная хромоникелевая сталь
CN109898023A (zh) * 2019-04-16 2019-06-18 柳州市创科复合金属陶瓷制品有限公司 板坯连铸辊轴承座及其制造方法

Also Published As

Publication number Publication date
EP1876255A1 (en) 2008-01-09
ES2392286T3 (es) 2012-12-07
WO2006114453A1 (es) 2006-11-02

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