EP0296439B1 - Austenitischer Stahl für Gaswechselventile von Verbrennungsmotoren - Google Patents

Austenitischer Stahl für Gaswechselventile von Verbrennungsmotoren Download PDF

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Publication number
EP0296439B1
EP0296439B1 EP88109345A EP88109345A EP0296439B1 EP 0296439 B1 EP0296439 B1 EP 0296439B1 EP 88109345 A EP88109345 A EP 88109345A EP 88109345 A EP88109345 A EP 88109345A EP 0296439 B1 EP0296439 B1 EP 0296439B1
Authority
EP
European Patent Office
Prior art keywords
austenitic steel
valves
carbon
internal combustion
combustion engines
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
EP88109345A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0296439A3 (en
EP0296439A2 (de
Inventor
Richard Dr. Dipl.-Ing. Weintz
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.)
TRW Thomson GmbH
Original Assignee
TRW Thomson GmbH
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 TRW Thomson GmbH filed Critical TRW Thomson GmbH
Publication of EP0296439A2 publication Critical patent/EP0296439A2/de
Publication of EP0296439A3 publication Critical patent/EP0296439A3/de
Application granted granted Critical
Publication of EP0296439B1 publication Critical patent/EP0296439B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Definitions

  • the invention relates to an austenitic, high-strength and hot corrosion-resistant steel for gas exchange valves of internal combustion engines.
  • powder metallurgy succeeds in producing very high-alloy steels which, because of their alloy structure, are difficult to produce in a conventional way via ingot casting, forging and rolling and with little output or no longer at all.
  • Powder metallurgy offers the possibility of cold compacting these high-alloy materials as atomized powder and then extruding them into bars with almost finished dimensions during hot extrusion.
  • the corrosion-chemical properties of the aforementioned precipitation-hardenable valve steels are also optimized with solution annealing, because only then does the high chromium content in the matrix required for corrosion protection go into solid solution.
  • the hot corrosion properties deteriorate because chromium is then preferably fixed in the precipitates and the finally coagulating precipitates and is removed from the alloy as a corrosion-protecting element.
  • the strength-increasing precipitates formed as precipitates by solution annealing and precipitation hardening are so largely aged that the coagulated precipitates can no longer contribute to increasing the strength and also impair the resistance of these steels to hot corrosion.
  • the object of the invention is to create a steel alloy of the type mentioned in the introduction, the properties of which can hardly be changed by the action of heat, in particular by the thermal stresses of the engine.
  • the solution to the invention problem is characterized by a Steel manufactured by powder metallurgy with the following alloy additives in mass percentages: carbon 0.30 - 0.70 Silicon 0.50 max. manganese 8.00 - 16.00 chrome 24.00 - 32.00 nickel 8.00 - 16.00 molybdenum 2.00 - 5.00 Niobium / tantalum 1.50 - 4.00 Vanadium 0.30 max. nitrogen 0.30 - 0.70 Balance iron, as well as manufacturing-related usual impurities
  • valve steel proposed according to the invention would have very special properties and advantages. It was found that his behavior can be changed very little by the effects of heat; because neither by solution annealing and precipitation hardening, nor by thermal stresses in the engine could its properties be influenced more than insignificantly. This means a considerable practical advantage. Gas exchange valves made from this steel can be used without any concerns without heat treatments such as solution annealing and / or precipitation hardening.
  • the steel with the proposed composition and produced by powder metallurgy has virtually unchangeable stable mechanical properties in all in the heat treatment Motor thermal stresses to be expected.
  • its superior corrosion resistance is not only created by the heat treatment solution annealing, but is already predetermined without this and other heat treatments due to the advantageous alloy structure and the homogeneous distribution of the alloy elements due to the extremely fine-grained structure by the powder metallurgical production.
  • the good corrosion resistance is therefore not affected by the thermal stresses in the engine, which was previously not considered achievable. Disadvantages of an economic nature, which cause the required heat treatments for the conventional steels, are avoided in the steel according to the invention.
  • the steel produced according to the invention has heat resistance and wear properties without heat treatment, which are partly due to the high carbon and nitrogen content, but also to the alloy-related matrix strengthening mentioned, and apparently due to the fine grain and the extraordinarily fine carbide and nitride - Distribution are supported.
  • the high carbide and carbonitride content in the fine structure which is in the finest distribution, leads, despite the lack of strength-enhancing heat treatment, to such high wear resistance on the abrasively loaded valve seat that this steel appears to be particularly suitable for unarmored gas exchange valves for diesel engines on the valve seat, for one - and exhaust valves to be used.
  • the strength properties and corrosion rates of the steel according to the invention in the case of oxidative attack are compared with the corresponding values of previously known steels with a similar alloy structure.
  • the selected embodiment of the steel according to the invention had the following chemical composition in mass percent: C 0.53 Si 0.40 Mn 9.9 Cr 24.6 Ni 9.6 Mon 3.03 V 0.05 Nb 1.97 N 0.50 Weight loss in g / dm2 due to corrosion attack in air treatment Alloy according to the invention Known alloy, e.g.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Heat Treatment Of Articles (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
EP88109345A 1987-06-23 1988-06-11 Austenitischer Stahl für Gaswechselventile von Verbrennungsmotoren Expired - Lifetime EP0296439B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3720605 1987-06-23
DE19873720605 DE3720605A1 (de) 1987-06-23 1987-06-23 Austenitischer stahl fuer gaswechselventile von verbrennungsmotoren

Publications (3)

Publication Number Publication Date
EP0296439A2 EP0296439A2 (de) 1988-12-28
EP0296439A3 EP0296439A3 (en) 1989-07-12
EP0296439B1 true EP0296439B1 (de) 1992-05-20

Family

ID=6330066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109345A Expired - Lifetime EP0296439B1 (de) 1987-06-23 1988-06-11 Austenitischer Stahl für Gaswechselventile von Verbrennungsmotoren

Country Status (3)

Country Link
EP (1) EP0296439B1 (enrdf_load_stackoverflow)
DE (2) DE3720605A1 (enrdf_load_stackoverflow)
ES (1) ES2032491T3 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2371980A1 (en) 2010-03-25 2011-10-05 Daido Tokushuko Kabushiki Kaisha Heat resistant steel for exhaust valve

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3073754B2 (ja) * 1989-08-02 2000-08-07 日立金属株式会社 エンジンバルブ用耐熱鋼
JP3328753B2 (ja) * 1993-12-22 2002-09-30 フジオーゼックス株式会社 肉盛用Ｆｅ基合金組成物
US20020110476A1 (en) 2000-12-14 2002-08-15 Maziasz Philip J. Heat and corrosion resistant cast stainless steels with improved high temperature strength and ductility
SE528991C2 (sv) * 2005-08-24 2007-04-03 Uddeholm Tooling Ab Ställegering och verktyg eller komponenter tillverkat av stållegeringen
KR102784890B1 (ko) 2011-05-26 2025-03-21 유나이티드 파이프라인스 아시아 패시픽 피티이 리미티드 오스테나이트계 스테인리스강
GB2611819B (en) * 2021-10-18 2024-09-18 Alloyed Ltd A heat-resistant austenitic stainless steel

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT160410B (de) * 1941-05-26 Krupp Ag Ventilkegel für Verbrennungsmotore.
US2553330A (en) * 1950-11-07 1951-05-15 Carpenter Steel Co Hot workable alloy
US2671726A (en) * 1950-11-14 1954-03-09 Armco Steel Corp High temperature articles
DE1044131B (de) * 1952-07-04 1958-11-20 Armco Int Corp Rostfreier Stahl
US2839391A (en) * 1954-10-21 1958-06-17 Armco Steel Corp Chromium-manganese alloy and products
GB803816A (en) * 1955-03-31 1958-11-05 Hadfields Ltd Corrosion resistant austenitic steel
US3401036A (en) * 1967-08-11 1968-09-10 Crucible Steel Co America Valve steel
US3561953A (en) * 1968-03-19 1971-02-09 Toyota Motor Co Ltd Austenitic heat-resisting steel containing nickel, chromium and manganese
FR2225535B1 (enrdf_load_stackoverflow) * 1973-04-12 1975-11-21 Creusot Loire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Druckschrift der Fa. Avesta Nyby, "Pulvermetallurgisch hergestellte Produkte", S. 1-12 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2371980A1 (en) 2010-03-25 2011-10-05 Daido Tokushuko Kabushiki Kaisha Heat resistant steel for exhaust valve

Also Published As

Publication number Publication date
DE3720605A1 (de) 1989-01-05
DE3720605C2 (enrdf_load_stackoverflow) 1991-04-18
EP0296439A3 (en) 1989-07-12
EP0296439A2 (de) 1988-12-28
DE3871248D1 (de) 1992-06-25
ES2032491T3 (es) 1993-02-16

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