US3859083A - Cast alloy for valve seat-insert - Google Patents

Cast alloy for valve seat-insert Download PDF

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Publication number
US3859083A
US3859083A US303026A US30302672A US3859083A US 3859083 A US3859083 A US 3859083A US 303026 A US303026 A US 303026A US 30302672 A US30302672 A US 30302672A US 3859083 A US3859083 A US 3859083A
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US
United States
Prior art keywords
alloy
valve seat
insert
cast alloy
wear resistance
Prior art date
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Expired - Lifetime
Application number
US303026A
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English (en)
Inventor
Kunio Kusaka
Makoto Osawa
Yoshitoshi Hagiwara
Tomio Sekine
Yoshiaki Takagi
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Honda R&D Co Ltd
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Honda R&D 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.)
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Publication date
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Application granted granted Critical
Publication of US3859083A publication Critical patent/US3859083A/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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Definitions

  • the present invention relates to a cast alloy for valve seatinsert comprising fundamentally in weight ratio 0.80 to 2.50 of C, 0.20 to 3.0 ofSi, 0.10 to 5.0 of Mn, 0.03 to 0.50 of P, 0.02 to 0.30 72 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, and. the remaining part consisting of iron and a slight amount of impurities.
  • This invention relates to a cast alloy for valve seatinsert having an excellent wear resistance for use in an automobile engine consuming lead-free gasoline.
  • the cast alloy according to the present invention is a phosphorus-containing precipitation-hardening type austenite alloy which can reach the ordinary temperature hardness of more than H C 40 carrying out an aging treatment after a solution treatment. Accordingly, the cast alloy according to the present invention has such features that it exhibits an excellent creep resistance at a high temperature and an improved corrosion resistance, and it is particularly excellent in the wear resistance when used as a valve seat insert for automobile engine.
  • the present invention has disclosed that the above mentioned excellent properties are obtained in a phosphorous-containing precipitation-hardening type austenite alloy having the following limited chemical composition; (1) C: 0.80 2.50 (2) Si: 0.20 3.0 (3) Mn: 0.10 5.0 (4) P: 0.03 0.50 (5) S: 0.02 0.3 (6) Ni: 13.0 28.0 (7) Cr: 10.0 30.0 (8) M: 0.1 5.0 (9) N: 0.02 0.20 the above percentages being all by weight, and the remaining part consists of iron and a slight amount of impurities.
  • the valve seat-insert is a part which plays an important role of maintaining an air-tightness in the cylinder by hitting and slide-contacting the suction valve and the exhaust valve at high temperatures.
  • Gasoline presently used contains lead for the purpose of raising its octane-value.
  • lead burns in the cylinder it is converted in lead oxide, and a part of said lead adheres to the exhaust valve and the valve seat-insert to play a role of a lubricant.
  • C is bonded to Cr to form a hard carbide and raise the wear resistance, and is solidsoluble in the austenite to increase the strength.
  • C is added at less than 0.80 the wear resistance is inferior and at more than 2.5 the tenacity is lowered. Therefore C was selected to be in a range of from 0.80 to 2.5
  • Si improves acid-proof and castability of the alloy. When Si is added to the alloy less than 0.2 the fluidity of the molten bath is inferior. When Si is added more than 3 the tenacity of the alloy decreases. Accordingly, Si was selected to be in a range of from 0.2 to 3.0
  • Mn is added as a deoxidant. Since it has an effect of enhancing austenite, the amount of Mn to be added was selected to be 0.10 to 5.0
  • P is necessary for imparting a precipitationhardening property to the alloy. However, it has little effect when it is added at less than 0.03 and when it is added at more than 0.50 its tenacity decreases. Therefore, it was selected to be in a range of from 0.03 to 0.50
  • S is effective in improving the fitness of the valve to the valve seat. It is added to the alloy to improve its machinability in the high hardness after aging. However, at less than 0.02 its effect is small and at more than 0.30 its tenacity decreases. Therefore, it was selected to be in a range of from 0.02 to 0.30
  • Ni is effective in converting the structure into austenite, improving the wear resistance, increasing the strength at the ordinary temperature and that at the high temperature, and maintaining the tenacity. It acts to improve fitness to the valve face. At less than 13 its effect is small, and at more than 28 the improvement of its effect is also small. It is, therefore, selected to be in a range of from 13.0 to 28.0
  • Cr is effective in forming a film on the surface of alloy, improving the antioxidation property and the wear resistance. In the case of Cr being less than 10.0 it is insufficient in antioxidation property, wear resistance and strength. When it is added more than 30 the te nacity of alloy is deteriorated and its machinability is also decreased, and therefore, it was selected to be in a range of from 10.0 to 30.0
  • M0 is effective in increasing the strength at the high temperature, enhancing the matrix and improving the wear resistance.
  • N is solid-soluble in austenite, and effective in increasing the hardness, increasing the strength at the high temperature, and improving the wear resistance. It is also effective in improving fitness. However, in the case where it is used at less than 0.02 its effect is small, and when it is more than 0.20 the tenacity as well as the castability of the alloy is decreased. it was, therefore, limited to 0.02 to 0.20
  • W forms a hard carbide and the structureis pulverized, and is effective in improving the wear resistance. At less than 0.1 its effect is small and even when it is added to the alloy at more than 5 the improvement in the effect is small. It was, therefore, selected to be in a range of from 0.1 to 5.0
  • V is also effective in forming a hard carbide, and pulverizing the structure and improving the wear resistance. At less than 0.1 its effect is small, and at more than 4 the'improvement of the effect is less, so that it was selected to be in a range of from 0.1 to 4.0
  • Co is effective in enhancing the matrix, increasing the high temperature hardness, improving the fitness and reducing the wear of the valve seat.
  • Co is added at less than 0.5 its effect is small and even if it is added more than the improvement of the effect is small. It was, therefore, selected to be in a range of from 0.5 to 10.0 v
  • Table 1 indicates the chemical compositions of respective samples.
  • the castings are subjected to aging treatment at 700 C for 2 hours after it has been subjected to the solution treatment at 1,l00 C, the hardness is raised to approximately H C 41, its wear resistance, its antioxidation property and its corrosion proof are very excellent, and it has good fitness to the valve face, and it has very excellent func- Chemical composition of alloys tested Alloy Chemical composition No.
  • An alloy for use in a valve seat consisting, in weight ratio, essentially of 0.80 to 2.50 of C, 0.20 to 3.0

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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)
US303026A 1972-05-17 1972-11-02 Cast alloy for valve seat-insert Expired - Lifetime US3859083A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47048124A JPS4911720A (enrdf_load_stackoverflow) 1972-05-17 1972-05-17

Publications (1)

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US3859083A true US3859083A (en) 1975-01-07

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Family Applications (1)

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US303026A Expired - Lifetime US3859083A (en) 1972-05-17 1972-11-02 Cast alloy for valve seat-insert

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US (1) US3859083A (enrdf_load_stackoverflow)
JP (1) JPS4911720A (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976476A (en) * 1974-12-23 1976-08-24 Robert Mrdjenovich High temperature cast austenitic exhaust valve
US4294614A (en) * 1979-10-17 1981-10-13 Teledyne Industries, Inc. Austenitic iron-base cryogenic alloy and arc welding electrode for depositing the same
US4534793A (en) * 1979-09-19 1985-08-13 Research Corporation Cast iron welding materials and method
US4586957A (en) * 1983-03-01 1986-05-06 Tsuyoshi Masumoto Iron-base alloy materials having excellent workability
US4726854A (en) * 1979-09-19 1988-02-23 Research Corporation Cast iron welding electrodes
US4790875A (en) * 1983-08-03 1988-12-13 Nippon Piston Ring Co., Ltd. Abrasion resistant sintered alloy
US4822695A (en) * 1987-03-23 1989-04-18 Eaton Corporation Low porosity surfacing alloys
US5246661A (en) * 1992-12-03 1993-09-21 Carondelet Foundry Company Erosion and corrsion resistant alloy
US5474737A (en) * 1993-07-01 1995-12-12 The United States Of America As Represented By The Secretary Of Commerce Alloys for cryogenic service
US6215615B1 (en) * 1997-11-28 2001-04-10 Nidec Corporation Data storage device
CN102330583A (zh) * 2011-09-27 2012-01-25 江铃汽车股份有限公司 汽车发动机气门座圈
CN104895695A (zh) * 2015-05-18 2015-09-09 夏志清 一种柴油发动机气缸盖
CN105624583A (zh) * 2016-03-08 2016-06-01 中国航空工业集团公司北京航空材料研究院 一种新型超高强度钢材及其制备方法
US9458743B2 (en) 2013-07-31 2016-10-04 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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5110804B2 (enrdf_load_stackoverflow) * 1972-06-29 1976-04-07

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306662A (en) * 1934-01-20 1942-12-29 Rustless Iron & Steel Corp Alloy
US3152934A (en) * 1962-10-03 1964-10-13 Allegheny Ludlum Steel Process for treating austenite stainless steels
US3198631A (en) * 1961-05-01 1965-08-03 Dougles E Jones Medium duty, wear resistant machine element
US3235417A (en) * 1965-01-11 1966-02-15 Chrysler Corp High temperature alloys and process of making the same
US3573034A (en) * 1967-09-18 1971-03-30 Armco Steel Corp Stress-corrosion resistant stainless steel
US3758294A (en) * 1970-03-23 1973-09-11 Pompey Acieries Rburization refractory iron base alloy resistant to high temperatures and to reca

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306662A (en) * 1934-01-20 1942-12-29 Rustless Iron & Steel Corp Alloy
US3198631A (en) * 1961-05-01 1965-08-03 Dougles E Jones Medium duty, wear resistant machine element
US3152934A (en) * 1962-10-03 1964-10-13 Allegheny Ludlum Steel Process for treating austenite stainless steels
US3235417A (en) * 1965-01-11 1966-02-15 Chrysler Corp High temperature alloys and process of making the same
US3573034A (en) * 1967-09-18 1971-03-30 Armco Steel Corp Stress-corrosion resistant stainless steel
US3758294A (en) * 1970-03-23 1973-09-11 Pompey Acieries Rburization refractory iron base alloy resistant to high temperatures and to reca

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976476A (en) * 1974-12-23 1976-08-24 Robert Mrdjenovich High temperature cast austenitic exhaust valve
US4534793A (en) * 1979-09-19 1985-08-13 Research Corporation Cast iron welding materials and method
US4726854A (en) * 1979-09-19 1988-02-23 Research Corporation Cast iron welding electrodes
US4294614A (en) * 1979-10-17 1981-10-13 Teledyne Industries, Inc. Austenitic iron-base cryogenic alloy and arc welding electrode for depositing the same
US4586957A (en) * 1983-03-01 1986-05-06 Tsuyoshi Masumoto Iron-base alloy materials having excellent workability
US4790875A (en) * 1983-08-03 1988-12-13 Nippon Piston Ring Co., Ltd. Abrasion resistant sintered alloy
US4822695A (en) * 1987-03-23 1989-04-18 Eaton Corporation Low porosity surfacing alloys
EP0602812A1 (en) * 1992-12-03 1994-06-22 Carondelet Foundry Company Erosion and corrosion resistant alloy
US5246661A (en) * 1992-12-03 1993-09-21 Carondelet Foundry Company Erosion and corrsion resistant alloy
US5474737A (en) * 1993-07-01 1995-12-12 The United States Of America As Represented By The Secretary Of Commerce Alloys for cryogenic service
US6215615B1 (en) * 1997-11-28 2001-04-10 Nidec Corporation Data storage device
CN102330583A (zh) * 2011-09-27 2012-01-25 江铃汽车股份有限公司 汽车发动机气门座圈
US9458743B2 (en) 2013-07-31 2016-10-04 L.E. Jones Company Iron-based alloys and methods of making and use thereof
US10138766B2 (en) 2013-07-31 2018-11-27 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
CN104895695A (zh) * 2015-05-18 2015-09-09 夏志清 一种柴油发动机气缸盖
CN104895695B (zh) * 2015-05-18 2017-09-19 宏远石油设备股份有限公司 一种柴油发动机气缸盖
CN105624583A (zh) * 2016-03-08 2016-06-01 中国航空工业集团公司北京航空材料研究院 一种新型超高强度钢材及其制备方法
CN105624583B (zh) * 2016-03-08 2018-01-19 中国航空工业集团公司北京航空材料研究院 一种超高强度钢材及其制备方法

Also Published As

Publication number Publication date
JPS4911720A (enrdf_load_stackoverflow) 1974-02-01

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