EP2470681A1 - Acier chromé martensitique inoxydable - Google Patents

Acier chromé martensitique inoxydable

Info

Publication number
EP2470681A1
EP2470681A1 EP10751807A EP10751807A EP2470681A1 EP 2470681 A1 EP2470681 A1 EP 2470681A1 EP 10751807 A EP10751807 A EP 10751807A EP 10751807 A EP10751807 A EP 10751807A EP 2470681 A1 EP2470681 A1 EP 2470681A1
Authority
EP
European Patent Office
Prior art keywords
chromium
steel according
steel
tungsten
chrome steel
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
EP10751807A
Other languages
German (de)
English (en)
Other versions
EP2470681B1 (fr
Inventor
Gisbert Kloss-Ulitzka
Oskar Pacher
Günter Schnabel
Vera Zeitz
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.)
ZAPP PRECISION METALS GMBH
Original Assignee
Stahlwerk Ergste Westig 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 Stahlwerk Ergste Westig GmbH filed Critical Stahlwerk Ergste Westig GmbH
Priority to PL10751807T priority Critical patent/PL2470681T3/pl
Publication of EP2470681A1 publication Critical patent/EP2470681A1/fr
Application granted granted Critical
Publication of EP2470681B1 publication Critical patent/EP2470681B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten

Definitions

  • the invention relates to a stainless martensitic chromium steel and its use.
  • Such steels are known in large numbers and, depending on their composition, are suitable for a very different range of uses
  • German Patent 100 27 049 B4 describes a martensitic chromium steel with 0.4 to 0.75% carbon, up to 0.7% silicon, up to 0.2% nickel, 0.4 to 1.6% manganese, 0, 02 to 0.15% sulfur, 12 to 19% chromium, 0.5 to 1, 5%
  • Molybdenum up to 1, 5% tungsten, up to 0.1% nitrogen and 0.05 to 0.3% vanadium, titanium and niobium alone or next to each other and up to 0.008% boron.
  • This steel has good processability, corrosion resistance and low plastic deformability a high wear and abrasion resistance, it is therefore suitable without a galvanic coating as a material for industrial needles and in particular allows a high Nah york
  • the material is unsuitable for a use whose characteristic feature is a rubbing or sliding contact metal / metal in the presence of a lubricant film.
  • BESTATIGUNGSKOPIE Of valve and dispensing needles and scraper rings of compressors is very important.
  • Hydrocarbon compounds but the parts can also be lubricated as in injection systems or oil scraper rings of the resource itself, such as fuel.
  • the decisive factor is always the emergence of an anti-slip film.
  • the practice uses a number of partly expensive, partly ecologically questionable additives such as EP additives, detergents, HD additives,
  • Lead compounds and chlorinated diphenyls for influencing, in particular for stabilizing and for fixing the wear-inhibiting layer.
  • Dosing or valve needles also for chemical or pharmaceutical mixtures the stability and the adhesion of the wear-reducing surface layer.
  • stabilization is not possible in various systems, such as with new methanol and ethanol containing fuels.
  • the invention is therefore based on the problem of a martensitic stainless
  • Chromium steel which due to its chemical affinity and strong adhesion forces has better wettability and forms a stable lubricant film, which is much more difficult to disturb or displace than conventional steels of this type and consequently causes less wear
  • the steel contains each individually or side by side
  • the carbon is austenite-forming and therefore stabilizes the austenitic crystal lattice At the same time, however, the carbon also contributes, together with the carbide formers, to precipitates which increase the hardness and abrasion resistance of the steel To prevent coarse and cellular precipitation of chromium carbides, it is advisable to precede other carbides in the austenitic Therefore, the steel contains 0.40 to 0.80%, preferably 0.55 to 0.75% of carbon
  • Silicon acts as a deoxidizer Higher levels may, however, lead to the formation of intermetallic phases. On the other hand, silicon is also a telematic agent
  • the steel therefore contains 0.2 to 1.5% silicon, preferably up to 0.65% silicon
  • Manganese stabilizes the austenite and advantageously shifts the formation of martensite to lower temperatures.
  • the maximum manganese content is therefore 1%, but should not fall below a minimum level of 0.30%, because manganese simultaneously alters the c / a ratio of the freshly formed martensite and In the austenitic range, the precipitation behavior of the fine precipitates is favorably influenced.
  • the sulfur content is limited to a maximum of 0.035%, since at higher sulfur contents disturbing sulfidic precipitates may occur
  • Chromium is required to ensure the corrosion resistance of the steel in combination with its molybdenum content of 1, 25 to 1, 50%, in particular a sufficient resistance to pitting.
  • the chromium content is therefore at least 16% in view of the femtizing effect of the chromium however, its content is limited to 18%
  • the synergistic effect of chromium and molybdenum on pitting resistance is particularly ensured when the contents of chromium, molybdenum and tungsten satisfy the following equation
  • the steel contains from 0.001 to 0.8% tungsten, preferably at least 0.001% tungsten, which, together with the iron and molybdenum, forms mixed carbides which contribute significantly to the hot strength of the steel and to the emergence of tempering in the case of tempering
  • the steel contains vanadium, niobium and titanium as carbide formers with the advantage that, given their high affinity for carbon, they form precipitating nuclei for the formation of chromium carbides even at very high temperatures.
  • the vanadium content therefore amounts to 0.15 to 0.20% Titanium and niobium contents of up to 0.05% in each case
  • the following effective sum of the carbide formers is particularly advantageous
  • K 1 (% Nb) + (% Ti) + (% V)
  • the steel further contains 0.001 to 0.03% of aluminum as a deoxidizer, but not more, because higher aluminum contents act provoking
  • the copper content amounts to a maximum of 0.5% and, in particular during tempering, leads to fine-grained secondary precipitates which, together with other precipitations, improve the wettability of the steel for oils or hydrocarbons
  • cobalt requires the formation of ⁇ -carbides and other fine precipitates, thus improving the heat resistance of the steel. For cost reasons, however, a cobalt content of 0.5% should not be exceeded
  • the cooling rate here should not exceed 50 ° C / sec (heat treatment A), in order not to carbide formation
  • martensite spontaneously forms below the MS temperature from the cubic body-centered crystal lattice, with the result that the previously formed carbides are incorporated in the martensite
  • the stress state of the matrix is the lower, the finer distributed the carbides are present This condition requires very much the lubricant or oil wetting of the surface of the steel
  • the martensite from the austenite transformation has a tetragonal distorted cage lattice with a ratio of the crystal axes a / c above 1
  • the heat treatment B consists in a Anlenfingluhen at 100 to 550 0 C, preferably at least 200 "C instead, and leads to the formation of Feinausscheidun- gene in the stabilized in the previous heat treatment A in the temperature range from 1100 to 900 0 C martensite In solution contained Atoms like the one of
  • FIG. 1 shows a schematic representation of an oil drop on a steel surface
  • FIG. 3 shows the track width R of a ball grinding track according to FIG. 2 as a measure of the wear resistance
  • Table I below shows the analyzes of five conventional comparative steels V1 to V5 and three steels E1 to E3 which fall under the invention.
  • Table II shows the cumulative values for K1 to K3 resulting from the analyzes
  • Austenitizing annealing labeled A in Table III took place at 1020 ° C. or 1050 ° C., followed by rapid cooling at a cooling rate of at least 50 ° C./sec to 800 ° C. and subsequent cooling to 300 within 5 minutes 0 C and a slow cooling to room temperature-the samples were also completed according to the test series B on a
  • the samples were then ground and polished, cleaned in an aqueous ultrasonic bath at 50 0 C, with hot distilled water under the action of ultrasound for another 20 min. freed of detergent residues and then dried.
  • the wettability index B 10 ⁇ l of paraffin oil were then applied to each sample by means of microdosing and the oil droplets then forming were measured with respect to their width B, as shown schematically in the illustration in FIG. The results of the measurements are listed together with the respective austenitizing temperature in the following table IM.
  • the abrasion or wear resistance was determined by means of a modified "Pm on disk experiment".
  • the cylindrical samples were first plane-steered, then cleaned, clamped in a holder and then under Fig. 2 under a rotating steel shaft with an eccentric carbide ball under pressure and spring preload dynamically loaded During the experiment, the contact zone between the sliding hard metal ball and the sample surface was steadily lubricated by the dripping of lubricating oil.
  • the factors K1 and K3 also show that the favorable test results are based on a more favorable precipitation of the carbides and other phases as well as the basic structure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

L'invention concerne un acier chromé martensitique inoxydable, contenant 0,40 à 0,80% de carbone, 0,20 à 1,50% de silicium, 0,15 à 1,00% de nickel, 0,30 à 1,00% de manganèse, 0,015 à 0,035% de soufre, 16 à 18% de chrome, 1,25 à 1,50% de molybdène, au maximum 0,8% de tungstène, 0,04 à 0,08% d'azote, 0,15 à 0,20% de vanadium, respectivement jusqu'à 0,05% de titane et de niobium, 0,001 à 0,03% d'aluminium, 0,02 à 0,5% d'acier, au maximum 0,5% de cobalt et au maximum 0,004% de bore, le reste étant constitué de fer, y compris les impuretés formées lors de la fusion. En raison de sa mouillabilité vis-à-vis des lubrifiants, cet acier chromé est particulièrement adapté en tant que matériau résistant à la corrosion, en particulier en tant que matériau résistant à la corrosion perforante, pour des objets exposés à l'usure par frottement.
EP10751807.8A 2009-08-24 2010-08-18 Acier inoxydable martensique Active EP2470681B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10751807T PL2470681T3 (pl) 2009-08-24 2010-08-18 Nierdzewna martenzytyczna stal chromowa

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009038382A DE102009038382A1 (de) 2009-08-24 2009-08-24 Rostfreier martensitischer Chromstahl
PCT/EP2010/005067 WO2011023326A1 (fr) 2009-08-24 2010-08-18 Acier chromé martensitique inoxydable

Publications (2)

Publication Number Publication Date
EP2470681A1 true EP2470681A1 (fr) 2012-07-04
EP2470681B1 EP2470681B1 (fr) 2013-11-20

Family

ID=42937637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10751807.8A Active EP2470681B1 (fr) 2009-08-24 2010-08-18 Acier inoxydable martensique

Country Status (5)

Country Link
EP (1) EP2470681B1 (fr)
DE (1) DE102009038382A1 (fr)
ES (1) ES2446716T3 (fr)
PL (1) PL2470681T3 (fr)
WO (1) WO2011023326A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018197554A1 (fr) * 2017-04-25 2018-11-01 Zapp Precision Metals Gmbh Acier au chrome martensitique, feuille d'acier, élément perforé et/ou troué en feuille d'acier, fil, corps de roulement d'un roulement à aiguilles, procédé pour la fabrication d'une feuille d'acier, d'un fil ou d'un corps de roulement d'un roulement à aiguilles

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011102293A1 (de) 2011-02-24 2012-08-30 Stahlwerk Ergste Westig Gmbh Verwendung eines Chromstahls mit martensitischem Gefüge und karbidischen Einschlüssen
CN115109891B (zh) * 2022-07-14 2022-12-20 中北大学 一种高碳高铬含氮马氏体不锈钢及其碳化物细化方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE404029B (sv) * 1968-05-31 1978-09-18 Uddeholms Ab Forfarande for framstellning av emnen for tunna eggverktyg av herdat stal
US3990892A (en) * 1972-03-28 1976-11-09 Kabushiki Kaisha Fujikoshi Wear resistant and heat resistant alloy steels
AT401387B (de) * 1994-06-29 1996-08-26 Boehler Ybbstalwerke Korrosionsbeständige legierung und verfahren zur herstellung korrosionsbeständiger schneidwaren
DE19808276C2 (de) * 1998-02-27 2003-12-24 Stahlwerk Ergste Westig Gmbh Stahllegierung für Gleitelemente
JP2000337389A (ja) * 1999-03-19 2000-12-05 Nsk Ltd 転がり軸受
DE10027049B4 (de) 2000-01-17 2004-09-16 Stahlwerk Ergste Westig Gmbh Verwendung einer Chrom-Stahllegierung
DE102004051629B4 (de) * 2004-10-23 2006-08-24 Stahlwerk Ergste Westig Gmbh Rostfreier martensitischer Chromstahl
JP2008291307A (ja) * 2007-05-24 2008-12-04 Daido Steel Co Ltd 金型の製造方法、金型用鋼材の製造方法、及び、金型用鋼材を用いた金型の製造方法
DE102007025758A1 (de) * 2007-06-01 2008-12-04 Mahle International Gmbh Dichtring

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011023326A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018197554A1 (fr) * 2017-04-25 2018-11-01 Zapp Precision Metals Gmbh Acier au chrome martensitique, feuille d'acier, élément perforé et/ou troué en feuille d'acier, fil, corps de roulement d'un roulement à aiguilles, procédé pour la fabrication d'une feuille d'acier, d'un fil ou d'un corps de roulement d'un roulement à aiguilles

Also Published As

Publication number Publication date
DE102009038382A1 (de) 2011-03-03
WO2011023326A1 (fr) 2011-03-03
EP2470681B1 (fr) 2013-11-20
ES2446716T3 (es) 2014-03-10
DE102009038382A8 (de) 2011-06-01
PL2470681T3 (pl) 2014-05-30

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