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WO2019229693A1 - Alloyed cast stell and article made therefrom - Google Patents

Alloyed cast stell and article made therefrom Download PDF

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Publication number
WO2019229693A1
WO2019229693A1 PCT/IB2019/054484 IB2019054484W WO2019229693A1 WO 2019229693 A1 WO2019229693 A1 WO 2019229693A1 IB 2019054484 W IB2019054484 W IB 2019054484W WO 2019229693 A1 WO2019229693 A1 WO 2019229693A1
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WO
WIPO (PCT)
Prior art keywords
steel
friction
hardness
article made
alloyed cast
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.)
Ceased
Application number
PCT/IB2019/054484
Other languages
French (fr)
Inventor
Roman Aleksandrovich SAVUSHKIN
Kirill Valterovich KYAKK
Viktor Sergeevich Babanin
Maksim Igorevich TERENTEV
Iurii Alekseevich BEROBRAZOV
Oleg Arkadevich BROITMAN
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.)
Rail 1520 IP Ltd
Original Assignee
Rail 1520 IP Ltd
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 Rail 1520 IP Ltd filed Critical Rail 1520 IP Ltd
Priority to US17/059,910 priority Critical patent/US20210262070A1/en
Priority to CN201980050503.0A priority patent/CN113166870A/en
Publication of WO2019229693A1 publication Critical patent/WO2019229693A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B61F5/02—Arrangements permitting limited transverse relative movements between vehicle underframe or bolster and bogie; Connections between underframes and bogies
    • B61F5/04—Bolster supports or mountings
    • B61F5/12—Bolster supports or mountings incorporating dampers
    • B61F5/122—Bolster supports or mountings incorporating dampers with friction surfaces
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/42—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 metallurgy, in particular to structural alloyed cast steel suitable for use in railway engineering, in particular in the railway car manufacturing industry.
  • a friction wedge for freight car trucks is a part of the shock absorber of the car providing stability and smoothness of movement during operation.
  • friction wedges are made of grey cast iron class 35 [Technical specifications 3183*234-01 124323-2007], class 25 [Bondarenko A.F., Gorenkov A.A., Fedin V.M., Boris A.l., Hardening of friction wedge made of grey cast iron by volume-surface hardening // Vestnik VNllZhT, 2010, volume 3, pp.
  • Manganese (Mn) 1.20 to 1.40
  • Phosphorus (P) no more than 0.030
  • Nickel (Ni) no more than 0.30
  • steel with the above narrowed ranges of carbon and manganese content, specified ranges of chromium, aluminium and vanadium content, and stricter requirements for phosphorus, sulfur, copper and nickel content, and characterized by the specified value of the calculated coefficient (i.e., the complex alloying coefficient CE) introduced by the inventors differs from the 30GSL grade steel selected as the prior art for the present invention in significantly higher hardness and wear resistance even without the use of advanced hardening methods.
  • the technical effect of the invention is in providing increased hardness and wear resistance of articles made of the steel according to the invention without a significant increase in their manufacturing costs.
  • Another technical effect is in providing increased hardness and wear resistance of surfaces of a friction wedge of freight car trucks and increased inter-repair service life of a friction wedge/friction plate friction pair.
  • a further technical effect of the invention is in avoiding expensive processing methods for the disclosed steel and replacing them with simple bulk hardening followed by tempering, while providing an increase in hardness and wear resistance values.
  • the present invention further provides an article made of the steel according to the invention.
  • the article is a friction wedge for freight car trucks.
  • Fig. 1 shows surface hardness of a part (a friction wedge made of steel according to the present invention) obtained after heat treatment (bulk hardening with tempering) as a function of the complex alloying coefficient CE of said steel calculated as
  • GOST 9012-59 Metals. Brinell method for measuring hardness.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Clamps And Clips (AREA)

Abstract

Disclosed is structural low-alloy manganese cast steel having increased hardness and wear resistance, and an article made therefrom. In particular, after carrying out conventional bulk hardening followed by tempering, the disclosed steel has hardness of approximately 418 to 512 HB and is suitable for use in railway engineering, in particular for manufacturing parts of freight car trucks such as a friction wedge. Due to improved hardness and wear resistance of the parts made of the steel according to the present invention, an increase in inter-repair service life, in particular, of the friction wedge/friction plate friction pair is provided without a significant increase in cost for the parts.

Description

ALLOYED CAST STEEL AND ARTICLE MADE THEREFROM
Field of the Invention
The present invention relates to metallurgy, in particular to structural alloyed cast steel suitable for use in railway engineering, in particular in the railway car manufacturing industry.
Background of the Invention
With the development of railway engineering, more and more attention is devoted to the development of improved structural materials with increased reliability and durability, which are at the same time relatively inexpensive. Such materials find their use in construction of above ground railways and manufacturing of various parts of the railway rolling stock. Further, the strictest requirements in terms of service reliability are imposed on steel used for railway rails and parts of freight and passenger car trucks, particularly for parts requiring durability and wear resistance, such as center plate discs, wheels and axles of car trucks, friction wedges and friction plates.
A friction wedge for freight car trucks is a part of the shock absorber of the car providing stability and smoothness of movement during operation. Currently, there are many different variations of friction wedges made of different materials. For example, friction wedges are made of grey cast iron class 35 [Technical specifications 3183*234-01 124323-2007], class 25 [Bondarenko A.F., Gorenkov A.A., Fedin V.M., Boris A.l., Hardening of friction wedge made of grey cast iron by volume-surface hardening // Vestnik VNllZhT, 2010, volume 3, pp. 40-42.] as well as of 20L grade steel [Gabets A.V., Developing the composition and technology for producing special modified cast iron with increased operational durability for friction units of railway rolling stock: PhD thesis in Technical Sciences: 05.16.01. - Moscow, 2014.], 20GL, 20FL, 20GTL grade steel [Bondarenko A.F., Gorenkov A.A., Fedin V.M., Boris A.L, Steel friction wedge hardened by volume-surface hardening // Vestnik VNITZhT. 2010, volume 3, pp. 43-45, However, a general disadvantage of friction wedges made of said materials is insufficient hardness and wear resistance of the wedges for tracks with a load of over 25 tf per axle.
Therefore, it is the object of the present invention to provide an alternative structural material suitable for manufacturing friction shock absorbers of friction force vibrations, the material having increased strength and durability while being relatively inexpensive. Summary of the Invention
In the present invention, the aforementioned problem is solved by providing a new composition of alloyed cast steel characterized by the following content of elements (wt.%):
Carbon (C) 0.27 to 0.35
Manganese (Mn) 1.20 to 1.40
Silicon (Si) 0.60 to 0.80
Chromium (Cr) 0.10 to 0.25
Aluminium (Al) 0.02 to 0.05
Vanadium (V) 0.015 to 0.040
Phosphorus (P) no more than 0.030
Sulfur (S) no more than 0.030
Nickel (Ni) no more than 0.30
Copper (Cu) no more than 0.30
Molybdenum (Mo) no more than 0.08
Iron (Fe) the remainder wherein the complex alloying coefficient CE for said steel calculated as CE = C + (Mn + Si)/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15 is no less than 0.68% wt.
Thus, as a result of extensive research, the present inventors discovered that steel with the above narrowed ranges of carbon and manganese content, specified ranges of chromium, aluminium and vanadium content, and stricter requirements for phosphorus, sulfur, copper and nickel content, and characterized by the specified value of the calculated coefficient (i.e., the complex alloying coefficient CE) introduced by the inventors differs from the 30GSL grade steel selected as the prior art for the present invention in significantly higher hardness and wear resistance even without the use of advanced hardening methods. In particular, higher hardness and wear resistance values were achieved using conventional bulk hardening followed by tempering, and accordingly, the manufacturing cost increase for such steel is insignificant compared to prior art materials; in particular, said cost increase is 3-7% compared to that for 20GL grade steel, tor example.
Thus, the technical effect of the invention is in providing increased hardness and wear resistance of articles made of the steel according to the invention without a significant increase in their manufacturing costs. Another technical effect is in providing increased hardness and wear resistance of surfaces of a friction wedge of freight car trucks and increased inter-repair service life of a friction wedge/friction plate friction pair. A further technical effect of the invention is in avoiding expensive processing methods for the disclosed steel and replacing them with simple bulk hardening followed by tempering, while providing an increase in hardness and wear resistance values.
The present invention further provides an article made of the steel according to the invention. According to a particular embodiment, the article is a friction wedge for freight car trucks.
Brief Description of the Drawings
Fig. 1 shows surface hardness of a part (a friction wedge made of steel according to the present invention) obtained after heat treatment (bulk hardening with tempering) as a function of the complex alloying coefficient CE of said steel calculated as
CE - C + (Mn + Si)/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15.
Detailed Description of the Invention
Comparative tests were carried out in order to determine hardness values for samples made of the steel according to the present invention as compared to the prior art materials used for manufacturing friction wedges: grey cast iron class 25 and steel grade 20GL. The test results are shown in Table 1 below.
Table 1
Figure imgf000005_0001
Brinell hardness measurements for the samples were carried out in accordance with the following procedure.
GOST 9012-59: Metals. Brinell method for measuring hardness.

Claims

1. Alloyed cast steel characterized by the following content of elements (wt.%):
Carbon (C) 0.27 to 0.35
Manganese (Mn) 1.20 to 1.40
Silicon (Si) 0.60 to 0.80
Chromium (Cr) 0.10 to 0.25
Aluminium (Al) 0.02 to 0.05
Vanadium (V) 0.015 to 0.040
Phosphorus (P) no more than 0.030
Sulfur (S) no more than 0.030
Nickel (Ni) no more than 0.30
Copper (Cu) no more than 0.30
Molybdenum (Mo) no more than 0.08
Iron (Fe) the remainder wherein the complex alloying coefficient CE for said steel calculated as
CE = C + (Mn + Si)/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
is no less than 0.68% wt.
2. Alloyed cast steel according to claim 1, characterized in that its hardness after bulk hardening followed by tempering ranges from 418 to 512 HB.
3. An article made of the steel according to claim 1 or 2 by casting.
4. The article according to claim 3, characterized in that the article made of the alloyed cast steel is a friction wedge of a freight car truck.
PCT/IB2019/054484 2018-05-30 2019-05-30 Alloyed cast stell and article made therefrom Ceased WO2019229693A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US17/059,910 US20210262070A1 (en) 2018-05-30 2019-05-30 Alloyed cast steel and article made therefrom
CN201980050503.0A CN113166870A (en) 2018-05-30 2019-05-30 Alloy cast steel and its products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EA201891069A EA201891069A1 (en) 2018-05-30 2018-05-30 ALLOY CASTING STEEL AND PRODUCTS FROM IT
EA201891069 2018-05-30

Publications (1)

Publication Number Publication Date
WO2019229693A1 true WO2019229693A1 (en) 2019-12-05

Family

ID=67060436

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2019/054484 Ceased WO2019229693A1 (en) 2018-05-30 2019-05-30 Alloyed cast stell and article made therefrom

Country Status (4)

Country Link
US (1) US20210262070A1 (en)
CN (1) CN113166870A (en)
EA (1) EA201891069A1 (en)
WO (1) WO2019229693A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111575495A (en) * 2020-06-17 2020-08-25 中国科学院过程工程研究所 A kind of method for extracting vanadium and chromium from vanadium slag

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1712454A1 (en) * 1989-04-27 1992-02-15 Уральский научно-исследовательский институт черных металлов Steel for castings
DE4343565C1 (en) * 1993-12-21 1995-06-08 Ver Schmiedewerke Gmbh Method for producing rail wheels and rail wheel parts
US20040000360A1 (en) * 2002-06-28 2004-01-01 Daisuke Suzuki Non-heat treated crankshaft
EP1538231A1 (en) * 2003-12-03 2005-06-08 Lucchini Sidermeccanica S.p.A. A microalloy bainitic steel with high resistance to fatigue and to fretting fatigue
RU101987U1 (en) * 2010-10-27 2011-02-10 "Афст Эдвансд Фрайт Кар Текнолоджи Лимитед" Friction damper of the wagons of a freight wagon

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59226114A (en) * 1983-06-02 1984-12-19 Caterpillar Mitsubishi Ltd Production of high strength cast steel product used for mechine structure
EP2873748B1 (en) * 2012-09-19 2018-03-14 JFE Steel Corporation Wear-resistant steel plate having excellent low-temperature toughness and corrosion wear resistance
CN102877008B (en) * 2012-10-09 2014-06-04 西安交通大学 Method for preparing bainite wear-resistant cast steel
CN103205650B (en) * 2013-03-28 2016-04-27 宝山钢铁股份有限公司 A kind of heat-resistant antifriction steel plate and manufacture method thereof
CN107747021A (en) * 2017-10-31 2018-03-02 攀钢集团攀枝花钢铁研究院有限公司 Corrosion-resistant rail for high-speed railway and its production method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1712454A1 (en) * 1989-04-27 1992-02-15 Уральский научно-исследовательский институт черных металлов Steel for castings
DE4343565C1 (en) * 1993-12-21 1995-06-08 Ver Schmiedewerke Gmbh Method for producing rail wheels and rail wheel parts
US20040000360A1 (en) * 2002-06-28 2004-01-01 Daisuke Suzuki Non-heat treated crankshaft
EP1538231A1 (en) * 2003-12-03 2005-06-08 Lucchini Sidermeccanica S.p.A. A microalloy bainitic steel with high resistance to fatigue and to fretting fatigue
RU101987U1 (en) * 2010-10-27 2011-02-10 "Афст Эдвансд Фрайт Кар Текнолоджи Лимитед" Friction damper of the wagons of a freight wagon

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
BONDARENKO A.F.GORELLKOV A.A.FEDIII V.M.BORTS A.I.: "Hardening of friction wedge made of grey cast iron by volume-surface hardening", VESTNIK VNL.IZHT, vol. 3, 2010, pages 40 - 42
BONDARENKO A.F.GORENKOV A.A.FEDIN V.M.BORTS A.I.: "Steel friction wedge hardened by volume-surface hardening", VESTNIK VNIIZHT, vol. 3, 2010, pages 43 - 45
GABETS A.V.: "Developing the composition and technology for producing special modified cast iron with increased operational durability for friction units of railway rolling stock", PHD THESIS IN TECHNICAL SCIENCES: 05.16.01, 2014

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111575495A (en) * 2020-06-17 2020-08-25 中国科学院过程工程研究所 A kind of method for extracting vanadium and chromium from vanadium slag
CN111575495B (en) * 2020-06-17 2021-11-26 中国科学院过程工程研究所 Method for extracting vanadium and chromium from vanadium slag

Also Published As

Publication number Publication date
CN113166870A (en) 2021-07-23
EA201891069A1 (en) 2019-12-30
US20210262070A1 (en) 2021-08-26

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