EP0425768B1 - Verfahren zum Herstellen eines nichtrostenden ferritischen Chromstahles - Google Patents

Verfahren zum Herstellen eines nichtrostenden ferritischen Chromstahles Download PDF

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Publication number
EP0425768B1
EP0425768B1 EP90114129A EP90114129A EP0425768B1 EP 0425768 B1 EP0425768 B1 EP 0425768B1 EP 90114129 A EP90114129 A EP 90114129A EP 90114129 A EP90114129 A EP 90114129A EP 0425768 B1 EP0425768 B1 EP 0425768B1
Authority
EP
European Patent Office
Prior art keywords
steel
chromium
carbon
ferritic
nickel
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
EP90114129A
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German (de)
English (en)
French (fr)
Other versions
EP0425768A1 (de
Inventor
Ehrhard Kluge
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.)
Rexnord Kette GmbH
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Rexnord Kette GmbH
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Filing date
Publication date
Application filed by Rexnord Kette GmbH filed Critical Rexnord Kette GmbH
Publication of EP0425768A1 publication Critical patent/EP0425768A1/de
Application granted granted Critical
Publication of EP0425768B1 publication Critical patent/EP0425768B1/de
Anticipated expiration legal-status Critical
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    • 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
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0087—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for chains, for chain links

Definitions

  • the invention relates to a method for producing a hot-rolled ferritic chromium steel.
  • stainless ferritic chromium steels are used in many ways as structural steels in view of their lower price compared to austenitic alloys; their corrosion resistance depends on the chromium and carbon content in individual cases. While the corrosion resistance improves with increasing chromium content, the presence of carbon leads to the formation of chromium-rich carbides, which separate at the grain boundaries and lead to chromium depletion there. This chromium depletion is associated with an impairment of the corrosion resistance in view of the aforementioned relationship between chromium content and corrosion resistance and leads to the fact that the ferritic steels are more or less susceptible to intergranular corrosion depending on the carbon content.
  • the aim is to keep the carbon content of ferritic steels as low as possible, but at least to bind them stably with titanium, but this is associated with a considerable loss in toughness and corrosion resistance and with the formation of titanium oxide, which affects the surface quality and toughness and the hot formability is impaired.
  • German patent specification 29 23 532 it is known from German patent specification 29 23 532 to first soft-anneal a stainless ferritic chromium steel after hot rolling and then cold-form it with a degree of deformation of 18 to 25%.
  • the annealing temperature is usually around 750 to 850 ° C, since higher annealing temperatures are associated with coarsening of the grain, which leads to a loss of toughness or to difficulties in cold forming.
  • the known method is also relatively complex in view of the soft annealing and the subsequent cold rolling and only leads to tensile strengths of 750 to 800 N / mm2 and in view of the relatively strong cold deformation to a not inconsiderable loss in toughness.
  • European Laid-Open Specification 0 273 279 describes a process in which a steel with 10.0 to 20.0% chromium, up to 0.10% carbon, up to 0.12% nitrogen Total nitrogen and carbon content not less than 0.01% and not more than 0.20%, up to 2.0% silicon, up to 4.0% manganese, up to 4.0% nickel and up to 4.0% copper with coordinated contents of nickel, manganese and copper, the rest of iron cold-rolled to the final thickness and then annealed in a continuous process at a temperature of Ac1 to 1100 ° C in the two-phase region and then cooled to convert the austenite to martensite and so a ferritic-martensitic structure is set.
  • the above-mentioned known processes all include cold rolling to increase the strength. Since this cold rolling is complex, the object of the invention is, by means of heat treatment, i.e. without such a cold rolling, a hot-rolled stainless ferritic chromium steel without loss of toughness to a high strength and hardness as well as a high cold formability.
  • the solution to this problem is based on the surprising finding that a ferritic chromium steel with 13 to 18% chromium is convertible and therefore hardenable despite a carbon content of at most 0.07%. Accordingly, the solution of the aforementioned task in detail is that a hot-rolled steel according to the invention 0.03 to 0.07% carbon at most 1% silicon at most 1% manganese 13 to 18% chromium at most 2% nickel Remainder iron including impurities due to melting solution annealed and without prior or subsequent cold rolling with a degree of deformation of more than 10% on a ferritic-martensitic two-phase structure with, for example, 50% martensite.
  • the quenching structure is characterized by a very small grain size, which results in a high strength of at least 800 N / mm2, for example 900 N / mm2 with high toughness at the same time, which is particularly advantageous when bending with a small bending radius to zero in the folding test.
  • the heat-treated steel according to the invention permits crack-free bending, which is of particular importance in the manufacture of hinged belt chains that are connected to one another via hinge pins. This also applies to the high hardness of about 105 to 107 HRB in the quenched state, which is associated with a correspondingly low scratch sensitivity or surface quality.
  • the steel should contain at least 1.0% nickel, at most 0.035% phosphorus and at most 0.025% sulfur, and with regard to the ferritic structure at most 0.03% nitrogen; it preferably contains at most 0.06% carbon, at least 0.01% nitrogen and at least 0.025% carbon and nitrogen. Higher nickel contents increase the austenite content in the structure and lead to difficulties in hot rolling, in particular to crack formation during winding.
  • the chromium content is preferably at least 16%.
  • hot-rolled strip is preferably quenched with water after continuous annealing, for example at a temperature above 1050 ° C., a structure which is extremely uniform over the length and having a correspondingly high tensile strength, yield strength and hardness and excellent surface quality.
  • the method according to the invention makes cold rolling to increase the strength superfluous; it results in a steel that is particularly suitable as a material for flat top or roller chains.
  • Hinged belt chains have welded, mostly dovetail-shaped guides on their undersides and slide with the undersides of the plate-shaped chain links and the guide shoes at a high speed of, for example, about 2 m / s over appropriately shaped, partly curved guide rails.
  • the relatively high weight of metallic flat top chains and their considerable load from the transported goods require a correspondingly high drive power for such a chain conveyor and is associated with considerable wear on the chain links and guide rails, which is greater the more uneven the chain links are.
  • the steel heat-treated by the process according to the invention is characterized by an approximately 50% higher yield strength, an approximately 10% higher hardness, high toughness and uniformity, excellent cold formability, better surface properties, higher fatigue strength, good weldability and a longer period Life out.
  • this has an effect in the direction of a lower sensitivity to noise, less wear and a lower maintenance effort.
  • the high dimensional accuracy of the chain links means that there is less danger of the goods being tipped over, particularly when transporting bottles.
  • a plate conveyor with a flat top chain 1 is used, for example, to convey bottles and containers in industrial and packaging systems.
  • Such a conveyor consists of chain links 2 arranged one behind the other, which have a flat supporting surface 3 for the goods to be transported.
  • the chain links 2 consist of a flat central part, the rear side edge 4 of which has a central hinge eye 6 and the opposite front side edge 5 of which has two hinge eyes 7 arranged at a distance from one another.
  • the central hinge eye 6 engages in the space between the hinge eyes 7 of the adjacent plate member and is articulated to it by a hinge pin, not shown.
  • the central hinge eyes 6 are designed so that they allow the individual chain links 2 to pivot laterally.
  • each chain link has guide surfaces 11 which extend essentially vertically downward and have guide tabs 12 which are angled outwards at right angles and which engage under the guide rails 8 for lateral and horizontal guidance on the guide rails 8.
  • the plate links 2 can be made with prefabricated, Provide C-shaped guide shoes.
  • the guide shoes thus each consist of two guide surfaces 11 connected to one another by a connecting web 14 welded to the underside of the chain link with at least one welding point 13, the guide surfaces 11 already being welded off-center to the connecting web 14.
  • the chain links in particular depend on good cold formability, weldability, hardness and wear resistance; because the hinge eyes 6, 7 are bent from the flaps of a punched flat material blank and tend to spring back when using conventional materials, which is at least associated with greatly increasing tolerances if it does not lead to rejects.
  • the welding of the guide shoes to the guide surfaces 11 and the guide tabs 12 requires a material that can be welded in the heat-affected zone without significant embrittlement and loss of corrosion resistance.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Wire Processing (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Tunnel Furnaces (AREA)
EP90114129A 1989-10-28 1990-07-24 Verfahren zum Herstellen eines nichtrostenden ferritischen Chromstahles Expired - Lifetime EP0425768B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936072 1989-10-28
DE3936072A DE3936072A1 (de) 1989-10-28 1989-10-28 Verfahren zum waermebehandeln

Publications (2)

Publication Number Publication Date
EP0425768A1 EP0425768A1 (de) 1991-05-08
EP0425768B1 true EP0425768B1 (de) 1995-02-08

Family

ID=6392507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90114129A Expired - Lifetime EP0425768B1 (de) 1989-10-28 1990-07-24 Verfahren zum Herstellen eines nichtrostenden ferritischen Chromstahles

Country Status (10)

Country Link
US (1) US5131960A (enrdf_load_stackoverflow)
EP (1) EP0425768B1 (enrdf_load_stackoverflow)
JP (1) JPH03146616A (enrdf_load_stackoverflow)
AT (1) ATE118250T1 (enrdf_load_stackoverflow)
BR (1) BR9005113A (enrdf_load_stackoverflow)
DE (1) DE3936072A1 (enrdf_load_stackoverflow)
DK (1) DK0425768T3 (enrdf_load_stackoverflow)
ES (1) ES2068292T3 (enrdf_load_stackoverflow)
GR (1) GR3015418T3 (enrdf_load_stackoverflow)
ZA (1) ZA906340B (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301754C2 (de) * 1993-01-23 1994-10-20 Rexnord Kette Gmbh & Co Kg Verfahren zum Herstellen von warmgewalztem Stahlband mit eingestellter Festigkeit
NL1023383C2 (nl) * 2003-05-09 2004-11-15 Rexnord Flattop Europe Bv Kettingpen voor scharnierbandkettingen.
KR101655784B1 (ko) * 2015-04-20 2016-09-09 대한민국 착탈식 냉각 패드를 구비한 조끼

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS471878B1 (en) * 1967-01-14 1972-01-19 Manufacturing method of ferritic stainless steel sheet having excellent workability without ridging
AT323222B (de) * 1970-12-24 1975-06-25 Schoeller Bleckmann Stahlwerke Wärmebehandlung ferritischer chromstähle, die von hohen temperaturen abgekühlt werden
DE2923532C2 (de) * 1979-06-09 1981-04-23 Krupp Stahl Ag, 4630 Bochum Verwendung eines ferritischen rostfreien Stahls für in geschweißtem Zustand ohne Wärmenachbehandlung gegeninterkrisalline Korrosion beständige Gegenstände
DE3105891C2 (de) * 1981-02-18 1983-12-01 Thyssen Edelstahlwerke AG, 4000 Düsseldorf Verwendung eines schweißbaren nichtrostenden Stahles für Kettenglieder
IT1171403B (it) * 1981-07-21 1987-06-10 Italtractor Procentimento per il trattamento termico diretto di maglie per catenarie di trattori o mezzi cingolati
DE3787961T2 (de) * 1986-12-30 1994-05-19 Nisshin Steel Co., Ltd., Tokio/Tokyo Verfahren zur Herstellung von rostfreien Chromstahlband mit Zweiphasen-Gefüge mit hoher Festigkeit und hoher Dehnung und mit niedriger Anisotropie.

Also Published As

Publication number Publication date
GR3015418T3 (en) 1995-06-30
DE3936072A1 (de) 1991-05-02
DE3936072C2 (enrdf_load_stackoverflow) 1993-06-17
US5131960A (en) 1992-07-21
DK0425768T3 (da) 1995-04-03
ATE118250T1 (de) 1995-02-15
BR9005113A (pt) 1991-09-17
EP0425768A1 (de) 1991-05-08
ZA906340B (en) 1991-06-26
JPH03146616A (ja) 1991-06-21
ES2068292T3 (es) 1995-04-16

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