US20210262070A1 - Alloyed cast steel and article made therefrom - Google Patents

Alloyed cast steel and article made therefrom Download PDF

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Publication number
US20210262070A1
US20210262070A1 US17/059,910 US201917059910A US2021262070A1 US 20210262070 A1 US20210262070 A1 US 20210262070A1 US 201917059910 A US201917059910 A US 201917059910A US 2021262070 A1 US2021262070 A1 US 2021262070A1
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Prior art keywords
steel
hardness
friction
article made
cast steel
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US17/059,910
Inventor
Roman Aleksandrovich Savushkin
Kirill Valterovich KYAKK
Viktor Sergeevich BABANIN
Maksim Igorevich TERENTEV
Iurii Alekseevich BEZOBRAZOV
Oleg Arkadevich BROITMAN
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RAIL 1520 IP Ltd
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RAIL 1520 IP Ltd
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Assigned to RAIL 1520 IP LTD reassignment RAIL 1520 IP LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BABANIN, VIKTOR SERGEEVICH, BEZOBRAZOV, IURII ALEKSEEVICH, BROITMAN, Oleg Arkadevich, KYAKK, Kirill Valterovich, SAVUSHKIN, Roman Aleksandrovich, TERENTEV, Maksim Igorevich
Publication of US20210262070A1 publication Critical patent/US20210262070A1/en
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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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/02—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
    • C22C38/24—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
    • C22C38/40—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
    • C22C38/20—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

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 3183-234-01124323-2007], class 25 [Bondarenko A. F., Gorenkov A. A., Fedin V. M., Borts A. I., Hardening of friction wedge made of grey cast iron by volume-surface hardening II Vestnik VNIIZhT, 2010, volume 3, pp. 40-42.] as well as of 20 L grade steel [Gabets A.
  • 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
  • CE C+(Mn+Si)/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
  • GOST 9012-59 Metals. Brinell method for measuring hardness.

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

    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 3183-234-01124323-2007], class 25 [Bondarenko A. F., Gorenkov A. A., Fedin V. M., Borts A. I., Hardening of friction wedge made of grey cast iron by volume-surface hardening II Vestnik VNIIZhT, 2010, volume 3, pp. 40-42.] as well as of 20 L 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., Borts A. I., Steel friction wedge hardened by volume-surface hardening II Vestnik VNIIZhT. 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 trucks 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, for 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
    Hardness, HB
    Steel according to the invention 418-512
    Grey cast iron class 25 197-260
    Steel 20GL 140-180
  • 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 (5)

1. Alloyed case 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 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.
5. An article made of steel according to claim 2 by casting.
US17/059,910 2018-05-30 2019-05-30 Alloyed cast steel and article made therefrom Abandoned US20210262070A1 (en)

Applications Claiming Priority (3)

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
PCT/IB2019/054484 WO2019229693A1 (en) 2018-05-30 2019-05-30 Alloyed cast stell and article made therefrom

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US20210262070A1 true US20210262070A1 (en) 2021-08-26

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CN (1) CN113166870A (en)
EA (1) EA201891069A1 (en)
WO (1) WO2019229693A1 (en)

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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

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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
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
JP3961982B2 (en) * 2002-06-28 2007-08-22 住友金属工業株式会社 Non-tempered crankshaft of work machine engine
ITMI20032370A1 (en) * 2003-12-03 2005-06-04 Lucchini Sidermeccanica S P A HIGH BAINITH MICROLEGATE STEEL FOR FATIGUE RESISTANCE
RU101987U1 (en) * 2010-10-27 2011-02-10 "Афст Эдвансд Фрайт Кар Текнолоджи Лимитед" Friction damper of the wagons of a freight wagon
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

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EA201891069A1 (en) 2019-12-30
CN113166870A (en) 2021-07-23
WO2019229693A1 (en) 2019-12-05

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