US3853545A - Cast alloy for valve seat insert - Google Patents

Cast alloy for valve seat insert Download PDF

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Publication number
US3853545A
US3853545A US00344583A US34458373A US3853545A US 3853545 A US3853545 A US 3853545A US 00344583 A US00344583 A US 00344583A US 34458373 A US34458373 A US 34458373A US 3853545 A US3853545 A US 3853545A
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US
United States
Prior art keywords
alloy
valve seat
present
seat insert
wear resistance
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.)
Expired - Lifetime
Application number
US00344583A
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English (en)
Inventor
K Kusaka
T Sekine
M Osawa
Y Hagiwara
Y Takagi
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.)
Honda R&D Co Ltd
Tokushu Seiko Co Ltd
Original Assignee
Honda R&D Co Ltd
Tokushu Seiko Co 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 Honda R&D Co Ltd, Tokushu Seiko Co Ltd filed Critical Honda R&D Co Ltd
Application granted granted Critical
Publication of US3853545A publication Critical patent/US3853545A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon

Definitions

  • the present invention relates to a cast alloy for a valve seat insert, which has an excellent wear resistance for automobile engines using non-leaded gasoline.
  • said alloy has an excellent creep resistance at high temperatures, further an excellent corrosion resistance, and an excellent wear resistance as a valve seat insert for automobile engines using non-lead gasoline.
  • the present invention discloses that such excellent properties are obtained in the austenitic alloy having the following restricted chemical composition: (1,) 0.80 to 2.50 of C, (2) 0.20 to 3.0 of Si, (3) 0.10 to 5.0 of Mn, (4) 0.03 to 0.50 of P, (5) 0.02 to 0.3 of S, (6) 13.0 to 28.0 of Ni, (7) 10.0 to 30.0 of Cr, (8) 0.1 to 5.0 of Mo, (9) 0.02 to 0.20 of N, (10) 5.0 to 15.0 of W, (11) 5.0 to 15.0 of Co, and the remaining part consisting of iron and a slight amount of impurities.
  • valve seat insert is a part playing an important role to retain airtightness within the cylinder by coming into impact and slide contact with the suction valve and exhaust valve at high temperatures.
  • lead is added for the purpose of raising the octane value.
  • lead burns within the cylinder, it is converted into lead oxide, and a part of the thus produced lead oxide is adherence to the exhaust valve and the valve seat insert and functions as a lubricant.
  • the present inventors have succeeded in obtaining an alloy having an excellent wear resistance as a valve seat insert for automobile engines using non-leaded gasoline by adding W and Mo to a high-carbon Cr Ni austenite alloy whose matrix is enhanced by adding Co and N, and further adding P to said alloy to impart a precipitation-hardening property thereby im parting a wear resistance to said alloy.
  • Said alloy has the following chemical composition.
  • Si improves acid resistance and castability. However, at less than 0.2 of Si, the fluidity of the molten bath is inferior, and at more than 3 of Si, the toughness of the alloy is lowered. It was, therefore, added thereto in the range of from 0.2 to 3.0 Mn is added to the alloy as a deoxidant and is effective for enhancing austenite formation. It was, therefore, added thereto in the range of from 0.10 to 5.0
  • P is necessary for imparting precipitation-hardening properties to the alloy. However, at less than 0.03 of P, its effect is poor. At more than 0.50 of P, the toughness of the alloy is lowered. It was, therefore, added thereto in the range of from 0.03 to 0.50
  • S produces a sulfide. It is effective to improve lubrication properties because the sulfide is present in the form of a fine granule. It is added to improve machinability of the hardened steel after aging treatment. However, at less than 0.02 of S, its effect is poor and at more than 0.30 thereof, toughness of the alloy is lowered. It was, therefore, added thereto in the range of from 0.02 to 0.30
  • Cr is effective for producing a film on the surface, and improves acid resistance and wear resistance.
  • the acid resistance, wear resistance and strength are not satisfactory.
  • toughness is deteriorated and machinability is lowered. Therefore, it was added to the alloy in the range of from 10.0 to 30.0
  • M0 is effective for increasing the strength at high temperatures, enhancing the matrix, and improving wear resistance. At less than 0.1 of Mo,its effect is poor, and at more than 5 of Mo. the improvement in the effect is slight and cost becomes high. Therefore, it was added to the alloy in the range of from 0.1 to 5.0 1
  • N is effective in increasing hardness by solidly dissolving in austenite, increasing strength at high temperatures and improving wear resistance. Also, it is effective in the improvement of fitting. At less than 0.02 its effect is small. Also, at more than 0.20 toughness and castability are lowered. Therefore, it was selected to be in the range from 0.02 to 0.20
  • W produces a hard carbide and is effective in pulverizing the structure and improving the wear resistance. At less than 5.0 its effect is poor and at over 15 the effect is poor. It was, therefore, selected to be in the range from 5.0 to 15.0
  • V produces a hard carbide and is effective in pulverizing the structure and improving the wear resistance. At less than 0.1 its effect is poor and even at more than 4 the effect is not so large. Therefore, it was selected to be in the range from 0.1 to 4.0
  • Co is effective for enhancing matrix, increasing the strength at high temperatures, improving of fitting and decreasing wear of the valve seat. At less than 5.0 of Co, its effect is poor, and at more than 15.0 of Co, the improvement in the effect is slight. Therefore, it was added to the alloy in the range of from 5.0 to 15.0
  • Table 1 shows the chemical compositions of the samlples.
  • Sample A in the Table is the steel for used in the present valve seat.
  • Samples B and C are alloys according to the present invention.
  • Table 2 shows the heat treatment hardness.
  • the sam- Mean wear Length of valve seat insert after 100 hr operation Table 3 Alloy No. Mean wear length (pl/hr) A 3.0 4.2 B 0.10 0.15 C 0.08 0.14
  • the alloys 13 and C according to the present invention have exceedingly small mean wear lengths in valve seats, and hence have very excellent functions as valve seats for non-leaded gasoline.
  • the casting thereof is subjected to solution heat treatment at 1 C.
  • hardness after subjecting the casting to aging treatment at 700C. for 2 hours is raised approximately to H C 41.
  • the alloy according to the present invention is extremely superior in wear resistance, oxidation resistance, and corrosion resistance fitting to the value face and thus it has excellent capacities as a valve seat for automobile engines using non-lead gasoline.
  • a high-efficiency alloy for a valve seat insert of ex cellent durability consisting essentially of in weight ratio 0.80 to 2.50 of C, 0.20 to 3.0 of Si, 0.10 to 5.0 of Mn, 0.03 to 0.50 of P, 0.02 to 0.30 of S, 13.0 to 28.0 of Ni, 10.0 to 30.0 of Cr, 0.1 to 5.0 ofMo, 0.02 to 0.20 of N, 5.0 to 15.0 of W, 5.0 to 15.0 of Co, and the remaining part consisting of iron and a slight amount of impurities.
  • a high-efficiency alloy for a valve seat insert of excellent durability consists essentially of in weight ratio 0.80 to 2.50 of C, 0.20 to 3.0 of Si, 0.10 to 5.0 of Mn, 0.03 to 0.50 of P, 0.02 to 0.30 of S, 13.0 to 28.0 of Ni, 10.0 to 30.0 of Cr, 0.1 to 5.0 of Mo, 0.02 to 0.20 of N, 5.0 to 15.0 of W, 5.0 to 15.0 of Co, 0.1 to 4.0 of V, and the remaining part consisting of iron and a slight amount of impurities.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
US00344583A 1972-06-29 1973-03-26 Cast alloy for valve seat insert Expired - Lifetime US3853545A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47064493A JPS5110804B2 (pt) 1972-06-29 1972-06-29

Publications (1)

Publication Number Publication Date
US3853545A true US3853545A (en) 1974-12-10

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US00344583A Expired - Lifetime US3853545A (en) 1972-06-29 1973-03-26 Cast alloy for valve seat insert

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US (1) US3853545A (pt)
JP (1) JPS5110804B2 (pt)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909252A (en) * 1973-11-01 1975-09-30 Suzuki Motor Co Wear-resistant cast iron for sliding surfaces
US3976476A (en) * 1974-12-23 1976-08-24 Robert Mrdjenovich High temperature cast austenitic exhaust valve
US4347080A (en) * 1980-01-12 1982-08-31 Daido Tokushuko K.K. Austenitic free-cutting stainless steel
EP0338204A2 (de) * 1988-02-25 1989-10-25 TRW Motorkomponenten GmbH & Co KG Hartstofflegierung
US6562293B1 (en) * 1997-08-11 2003-05-13 Alphatech, Inc. Material formulation for galvanizing equipment submerged in molten aluminum and aluminum/zinc melts
US20080001115A1 (en) * 2006-06-29 2008-01-03 Cong Yue Qiao Nickel-rich wear resistant alloy and method of making and use thereof
US9638075B2 (en) 2013-12-02 2017-05-02 L.E. Jones Company High performance nickel-based alloy
US9932867B2 (en) * 2013-09-19 2018-04-03 L.E. Jones Company Iron-based alloys and methods of making and use thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6127207U (ja) * 1984-07-18 1986-02-18 日通工株式会社 チヨ−クコイル

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235417A (en) * 1965-01-11 1966-02-15 Chrysler Corp High temperature alloys and process of making the same
US3663215A (en) * 1969-08-13 1972-05-16 Armco Steel Corp Wear-resistant stainless steel
US3692515A (en) * 1968-07-30 1972-09-19 Latrobe Steel Co Ferrous alloys and abrasion resistant articles thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513469A (en) * 1946-05-09 1950-07-04 Union Carbide & Carbon Corp Alloy articles for use at high temperatures
FR1397644A (fr) * 1964-05-21 1965-04-30 Chrysler Corp Alliages à base de fer présentant notamment une haute résistance aux températures supérieures à 650 u deg. c
GB1310123A (en) * 1970-04-21 1973-03-14 Apv Paramount Ltd Heat-resisting steels
JPS4911720A (pt) * 1972-05-17 1974-02-01

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235417A (en) * 1965-01-11 1966-02-15 Chrysler Corp High temperature alloys and process of making the same
US3692515A (en) * 1968-07-30 1972-09-19 Latrobe Steel Co Ferrous alloys and abrasion resistant articles thereof
US3663215A (en) * 1969-08-13 1972-05-16 Armco Steel Corp Wear-resistant stainless steel

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909252A (en) * 1973-11-01 1975-09-30 Suzuki Motor Co Wear-resistant cast iron for sliding surfaces
US3976476A (en) * 1974-12-23 1976-08-24 Robert Mrdjenovich High temperature cast austenitic exhaust valve
US4347080A (en) * 1980-01-12 1982-08-31 Daido Tokushuko K.K. Austenitic free-cutting stainless steel
EP0338204A2 (de) * 1988-02-25 1989-10-25 TRW Motorkomponenten GmbH & Co KG Hartstofflegierung
EP0338204A3 (de) * 1988-02-25 1992-07-01 TRW Motorkomponenten GmbH & Co KG Hartstofflegierung
US6562293B1 (en) * 1997-08-11 2003-05-13 Alphatech, Inc. Material formulation for galvanizing equipment submerged in molten aluminum and aluminum/zinc melts
US20080001115A1 (en) * 2006-06-29 2008-01-03 Cong Yue Qiao Nickel-rich wear resistant alloy and method of making and use thereof
US8613886B2 (en) 2006-06-29 2013-12-24 L. E. Jones Company Nickel-rich wear resistant alloy and method of making and use thereof
US9932867B2 (en) * 2013-09-19 2018-04-03 L.E. Jones Company Iron-based alloys and methods of making and use thereof
US9638075B2 (en) 2013-12-02 2017-05-02 L.E. Jones Company High performance nickel-based alloy

Also Published As

Publication number Publication date
JPS5110804B2 (pt) 1976-04-07
JPS4923717A (pt) 1974-03-02

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