EP0157093A2 - Dents des dragues - Google Patents

Dents des dragues Download PDF

Info

Publication number
EP0157093A2
EP0157093A2 EP85100709A EP85100709A EP0157093A2 EP 0157093 A2 EP0157093 A2 EP 0157093A2 EP 85100709 A EP85100709 A EP 85100709A EP 85100709 A EP85100709 A EP 85100709A EP 0157093 A2 EP0157093 A2 EP 0157093A2
Authority
EP
European Patent Office
Prior art keywords
teeth
temperature
steel alloy
forging
tempered
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.)
Granted
Application number
EP85100709A
Other languages
German (de)
English (en)
Other versions
EP0157093B1 (fr
EP0157093A3 (en
Inventor
Heinz Dr.-Ing. Lepand
Margrit Hüser
Franz-Josef Biniasz
Axel Dr.-Ing. Fuchs
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.)
Hoesch AG
Original Assignee
Hoesch AG
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 Hoesch AG filed Critical Hoesch AG
Priority to AT85100709T priority Critical patent/ATE31555T1/de
Publication of EP0157093A2 publication Critical patent/EP0157093A2/fr
Publication of EP0157093A3 publication Critical patent/EP0157093A3/de
Application granted granted Critical
Publication of EP0157093B1 publication Critical patent/EP0157093B1/fr
Expired legal-status Critical Current

Links

Images

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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/285—Teeth characterised by the material used

Definitions

  • Suction dredging is a funding principle in ship excavator technology, in which a rotating cutting head works according to the principle of a milling cutter. Adapters are welded to the individual blades of the cutting head in a tangential arrangement. The actual tools, d. H. the teeth are attached to the adapters with a clamping mechanism for quick interchangeability. Since the cutting heads often work under the most difficult operating conditions, the teeth have e.g. B. on rocky subsoil under sea water often only up to 15 minutes. This high wear of the teeth or their tips causes a consumption of several 100 pieces per month and suction dredger, depending on the nature of the soil and the intermediate medium, and consequently affects the productivity of the systems to a large extent.
  • the tools i. H. the excavator teeth
  • the excavator teeth in the case of the described removal method, are primarily subject to sliding wear, d. that is, there are abrasion processes on the surface of the teeth caused by contact with mineral substances;
  • these processes are reinforced by corrosion.
  • the teeth are exposed to considerable mechanical loads (pressure, bending, torsion and impact), which results in the need for a high level of shape and form stability.
  • both excavator teeth and suction excavator teeth made of cast steel of the most varied quality are used.
  • the cast steel is predominantly alloyed with Cr-Mo, Cr-Ni-Mo or Cr-Mo-V; the tools are generally remunerated to a hardness of 48-50 HRC.
  • cast excavator teeth with approx. 30 J at room temperature have relatively poor toughness properties .
  • Suction dredger teeth in particular, are therefore forged in a known manner from the aforementioned relatively expensive materials in order above all to improve their toughness.
  • the invention is based on the object of avoiding the disadvantages arising from the opposing requirements discussed above and proposing an inexpensive, forgeable, temper-resistant steel for excavator teeth, which is nonetheless hardness and toughness, in addition to the corrosion resistance required especially for suction dredger teeth, and thus has an overall wear resistance to the required extent.
  • the steel alloy after forging, hardening and tempering Structure of finely structured tempered martensite with a few fine embedded carbides (M 3 C) and a carbide size of 30 - 80 nm as well as a compact fiber course a yield strength of more than 1,550 N / mm 2 , a tensile strength of 1,800 - 1,880 N / mm 2 , has an elongation 5 of more than 10%, a constriction of more than 35% and a hardness of more than 51 HRC and a notched impact strength of more than 40 J at RT (measured on ISO-V samples).
  • the good tempering resistance of the developed material was checked by hot tensile tests at 100-600 ° C.
  • the tempering curve according to FIG. 1 initially shows a uniformly flat and from 400 ° C a steeper drop in strength with increasing temperature. Assuming a tensile strength of 2,000 N / mm2 set by hardening (880 ° C / oil), the strength of the steel at a tempering temperature of 400 ° C is still 1,800 N / mm 2 , ie at 400 ° C with approx. 51.5 HRC still the required working hardness for excavator teeth and is therefore characterized by good temper resistance. This also means, however, that after forging and hardening, the tempering temperature can be increased to 400 ° C above 350 ° C and the toughness of the material can thus be improved without significantly impairing its wear resistance, ie abrasion.
  • tempered steel shows the structure of the tempered steel (a) under light and (b) electron microscopy. It consists of finely structured tempered martensite with a few fine embedded carbides (M 3 C), (carbide size: 30 - 80 nm).
  • the test was carried out with a cutting head with 6 blades of 7 adapters each; the soil conditions were constant during the tests. There was a medium-heavy limestone soil with a compressive strength of 30 - 80 kp / cm 2 under sea water.
  • the teeth were measured and weighed before and after the experiments.
  • Table 1 shows the compilation and evaluation of the most important results of both experiments.
  • the teeth made of material C according to the invention had lost an average of 6.40 cm, the teeth made of comparison material D had lost 8.94 cm. That corresponds to one 39.7% higher wear of teeth made of material D compared to teeth made of material C.
  • the evaluation of the tooth weights gives a similar result.
  • the teeth made of material C had an average weight loss of 2.05 kg, those made of material D of 2.97 kg, which corresponds to a 44.9% higher weight loss.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Heat Treatment Of Articles (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Forging (AREA)
  • Shovels (AREA)
  • Table Equipment (AREA)
EP85100709A 1984-04-03 1985-01-24 Dents des dragues Expired EP0157093B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100709T ATE31555T1 (de) 1984-04-03 1985-01-24 Baggerzaehne.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3412405 1984-04-03
DE3412405A DE3412405C1 (de) 1984-04-03 1984-04-03 Verwendung einer verschleissfesten,anlassbestaendigen Stahllegierung fuer Baggerzaehne

Publications (3)

Publication Number Publication Date
EP0157093A2 true EP0157093A2 (fr) 1985-10-09
EP0157093A3 EP0157093A3 (en) 1986-01-02
EP0157093B1 EP0157093B1 (fr) 1987-12-23

Family

ID=6232485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100709A Expired EP0157093B1 (fr) 1984-04-03 1985-01-24 Dents des dragues

Country Status (6)

Country Link
US (1) US4710244A (fr)
EP (1) EP0157093B1 (fr)
JP (1) JPS60224759A (fr)
AT (1) ATE31555T1 (fr)
DE (2) DE3412405C1 (fr)
ES (1) ES8801710A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117448685B (zh) * 2023-11-08 2024-08-20 广州航海学院 一种耙齿齿冠用铸钢及其制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2332441A (en) * 1941-04-04 1943-10-19 Timken Roller Bearing Co Carburized article
CH311324A (de) * 1952-03-12 1955-11-30 Gussstahlwerk Witten Aktienges Verfahren zur Herstellung eines Werkstückes aus einer Stahllegierung.
JPS5423329B2 (fr) * 1974-02-12 1979-08-13
FR2264887A1 (en) * 1974-03-20 1975-10-17 Centro Speriment Metallurg Steel of high strength and good ductility - comprising chromium manganese, silicon, and carbon, having high delay at start of perlitic transformation and metastable austenitic phase
SU667609A1 (ru) * 1977-10-13 1979-06-15 Физико-технический институт АН Белорусской ССР Сталь
DE7828385U1 (de) * 1978-09-23 1979-01-18 Berchem & Schaberg Gmbh, 4650 Gelsenkirchen Auf einen Adapter aufsetzbarer Zahn für den Saugkopf von Saugkopfbaggern
SE426177B (sv) * 1979-12-03 1982-12-13 Uddeholms Ab Varmarbetsstal
SU1067078A1 (ru) * 1982-03-02 1984-01-15 Московское Ордена Ленина, Ордена Октябрьской Революции И Ордена Трудового Красного Знамени Высшее Техническое Училище Им. Н.Э.Баумана Сталь

Also Published As

Publication number Publication date
DE3561249D1 (en) 1988-02-04
EP0157093B1 (fr) 1987-12-23
DE3412405C1 (de) 1985-06-20
ATE31555T1 (de) 1988-01-15
ES541810A0 (es) 1988-02-16
JPS60224759A (ja) 1985-11-09
US4710244A (en) 1987-12-01
EP0157093A3 (en) 1986-01-02
ES8801710A1 (es) 1988-02-16

Similar Documents

Publication Publication Date Title
DE3117539C2 (fr)
DE1533239B1 (de) Verwendung eines stahles fuer tellerventile
DE69218779T2 (de) Pulvermetallurgisch hergestellter schnellarbeitsstahl
DE4202828C2 (de) Verwendung einer verschleißbeständigen Legierung
DE69512039T2 (de) Tiefhärtender borenthaltender stahlgegenstand mit erhöhter bruchduktilität und verbesserter verschleisseigenschaften
DE2447137B2 (de) Gegen gruebchenkorrosion bestaendige stahllegierung
DE2423963A1 (de) Werkzeug zur erdbearbeitung
DE69018064T2 (de) Draht für Punktmatrixdrucker.
CH365880A (de) Verfahren zur Herstellung von Werkstücken mit hoher Dämpfungsfähigkeit, nach diesem Verfahren hergestelltes Werkstück und dessen Verwendung
DE2915688A1 (de) Stahllegierung und verwendung derselben
DE2937460A1 (de) Verschleissfeste nickellegierung
EP0157093B1 (fr) Dents des dragues
DE69912228T2 (de) Webmaschinenteil, das aus einem abriebbeständigen Stahl hergestellt ist
DE4302635C2 (de) Verwendung eines niedrig legierten Stahls
DE2254933B2 (de) Teile von Pumpen, die auf Verschleiß beansprucht und gleichzeitig der Einwirkung von öl, Schmutz und Wasser ausgesetzt sind
DE60000190T2 (de) Lagerstahl
DE3335224A1 (de) Stahl fuer hoher flaechenpressung ausgesetzte gegenstaende, wie waelzlager
EP0230576A1 (fr) Acier allié pour outils à haute résistance à l'usure
DE112016001868T5 (de) Meißel und Stahl für Meißel
EP0060577B1 (fr) Matériau ayant une résistance élevée à la corrosion par la fatigue pour des aubes de turbine, procédé pour sa fabrication et son utilisation
AT500728B1 (de) Schneidwerkzeug
AT151518B (de) Warmbeanspruchte Werkzeuge und Teile aus Stählen mit einem oder mehreren der bakannten Legierungselemente, die eine Ausscheidungshärtung bewirken, und sonst beliebiger Zusammensetzung.
DE766033C (de) Stahllegierung fuer in Wasser zu haertende Ziehwerkzeuge
DE933154C (de) Stahllegierung fuer Gegenstaende, von denen hohe Wechselfestigkeit verlangt wird
DE1192829B (de) Verwendung einer Chromstahllegierung als Werkstoff fuer Saegekettenglieder und Verfahren zu deren Herstellung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

ITCL It: translation for ep claims filed

Representative=s name: RICCARDI SERGIO & CO.

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

EL Fr: translation of claims filed
TCNL Nl: translation of patent claims filed
AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19860212

17Q First examination report despatched

Effective date: 19870318

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 31555

Country of ref document: AT

Date of ref document: 19880115

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3561249

Country of ref document: DE

Date of ref document: 19880204

ET Fr: translation filed
ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19901210

Year of fee payment: 7

Ref country code: FR

Payment date: 19901210

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19901212

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19901217

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19901220

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19901221

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19910108

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19910131

Year of fee payment: 7

EPTA Lu: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19920124

Ref country code: GB

Effective date: 19920124

Ref country code: AT

Effective date: 19920124

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19920125

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19920131

Ref country code: LI

Effective date: 19920131

Ref country code: CH

Effective date: 19920131

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920318

Year of fee payment: 8

BERE Be: lapsed

Owner name: HOESCH A.G.

Effective date: 19920131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19920801

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19920930

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19931103

EUG Se: european patent has lapsed

Ref document number: 85100709.6

Effective date: 19920806