EP0216044A2 - Procédé de fabrication de bandes en acier résistant au vieillissement et apte au formage à froid - Google Patents

Procédé de fabrication de bandes en acier résistant au vieillissement et apte au formage à froid Download PDF

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Publication number
EP0216044A2
EP0216044A2 EP86109521A EP86109521A EP0216044A2 EP 0216044 A2 EP0216044 A2 EP 0216044A2 EP 86109521 A EP86109521 A EP 86109521A EP 86109521 A EP86109521 A EP 86109521A EP 0216044 A2 EP0216044 A2 EP 0216044A2
Authority
EP
European Patent Office
Prior art keywords
max
steel
rolling
cold
steels
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
EP86109521A
Other languages
German (de)
English (en)
Other versions
EP0216044A3 (en
EP0216044B1 (fr
EP0216044B2 (fr
Inventor
Ernst Jürgen dr. Drewes
Bernhard Dr. Engl
Klaus Dieter Horn
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.)
Krupp Hoesch Stahl AG
Original Assignee
Hoesch Stahl AG
Krupp Hoesch Stahl 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6278246&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0216044(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hoesch Stahl AG, Krupp Hoesch Stahl AG filed Critical Hoesch Stahl AG
Priority to AT86109521T priority Critical patent/ATE104362T1/de
Publication of EP0216044A2 publication Critical patent/EP0216044A2/fr
Publication of EP0216044A3 publication Critical patent/EP0216044A3/de
Publication of EP0216044B1 publication Critical patent/EP0216044B1/fr
Application granted granted Critical
Publication of EP0216044B2 publication Critical patent/EP0216044B2/fr
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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0421—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • 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
    • 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/041—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing involving a particular fabrication or treatment of ingot or slab

Definitions

  • the invention relates to a method for producing an aging-resistant steel strip with high cold formability by hot strip rolling, cold rolling, recrystallizing annealing and subsequent skin passaging.
  • Cold rolled steel strip is widely used for the production of cold formed products.
  • different properties characteristic values
  • different properties characteristic values
  • the following material properties and characteristic values are also decisive: - When bending, such as in the production of cold profiles, low yield strengths and high elongation at break values are sufficient, - in the case of stretch-drawing processes, a high hardening exponent n m is also sought, -
  • the value of the vertical anisotropy r m should also be as high as possible.
  • Hot rolled steels for the aforementioned purposes are recrystallized annealed after cold rolling.
  • Discontinuous annealing processes have disadvantages, eg low productivity, because the process takes several days.
  • the newly preferred continuous processes of recrystallizing annealing such as those shown in the book "Manufacture of Cold-Rolled Strip", 1970, published by Stahleisen Düsseldorf in Fig. 28, offer the possibility of achieving significantly higher productivity in this one process step.
  • OS 2 348 062 describes the use of these devices for producing cold-rolled steel strip with good forming properties from unsettled and calmed steels.
  • the steel is subjected to a brief aging treatment in the range from about 250 to 450 ° C. after the annealing treatment in order to achieve the aging resistance required for processing the cold strip. This is followed by the so-called "skin treatment".
  • the object of the invention is achieved in detail in that the high slab preheating temperatures used in the prior art are exited in the new process, that is to say are lowered.
  • the final rolling temperature is also differentiated, that is, the hot rolling is ended at a temperature below or above the transition temperature A 3 in the last finishing stand.
  • the overall effect is surprisingly achieved in a product whose properties are specifically improved.
  • a temperature range of approximately 1 100-1 300 ° C is generally introduced ("Eisendazzling", Berlin 1961, p. 427).
  • the higher ranges are preferred because, as is known, the hot-formability of the steels is improved with increasing temperature, so that the energy consumption of the rolling motors can be reduced as the initial rolling temperature increases, and also - despite the inevitable drop in temperature from the roughing stand to the last finishing stand - the final roll temperature is still above the structural transformation temperature A3. It is considered advantageous that the last frame of the finishing line is passed above A3.
  • DE-OS 31 38 302 claim 1, describes a process for producing "cold-rolled steel strip of high strength".
  • a heating of the steel slabs to a maximum of 1200 ° C or in the range 1200 to 1000 ° C is also proposed.
  • the desired yield strengths are, as Table 2 shows, over 20 kp / mm2.
  • This publication does not provide any references to the steels to be produced according to the invention, which have a completely different composition, their forming behavior and low yield strengths.
  • Claims 1 and 5 name the upper and lower limits of the slab preheating temperature according to the invention.
  • Claim 6 specifies (compared to the prior art) lower roll temperatures. The effect of this measure is explained in Fig. 1 using bar graphs. Steel 1 has the following composition (percentages by mass): C 0.02% Si 0.01% Mn 0.2% P 0.008% S 0.012% Al 0.04% N 0.003%
  • This Al-calmed steel has a low alloy content and does not belong to the group of "micro-alloyed steels". It was preheated as a slab according to the prior art at 1 270 ° C and rolled in a conventional manner warm with a final temperature of 920 ° C and cold. The most important five material key figures are graphically recorded on the left edge of the diagrams. The yield strength is still sufficient for high cold forming requirements; At 40%, the elongation at break is barely sufficient for very demanding applications. The same applies to the hardening coefficient. The same characteristic values are shown in the right half of the corresponding fields when the cold strip is produced according to the invention.
  • the slab was first preheated to the lowest temperature range mentioned in claim 5 and then, as is known to the person skilled in the art, the strip was cooled between the preliminary and the finished batch, so that the strip emerged from the last finishing stand at 800 ° C.
  • the percentage decrease in thickness of the strip after passing through the transition temperature still reached 40%.
  • Cold strip made from this hot strip despite the low alloying effort, achieved such favorable values of yield strength, elongation at break and strengthening exponent that these products can also be used for the most demanding purposes using stretch drawing and three-dimensional folding.
  • the characteristic value of the vertical anisotropy r m with 1.3 is not sufficient for the production of complicated deep-drawn parts.
  • Claim 7 specifies for the hot rolling process that the entire rolling process is ended (that is, the last finishing stand is run through) before the rolling stock cools below the A3 point.
  • steels according to the invention for example 2 the same low-alloy steel is used, which was also produced according to example 1 and subsequently examined.
  • the analysis according to the invention is in percentages by mass: C 0.005% Si 0.01% Mn 0.18% P 0.006% S 0.014% Al 0.03% N 0.004% Ti 0.09%
  • This steel was produced in the steelworks more elaborately, namely vacuum decarburized and also alloyed with Ti.
  • Example 2 As shown in Fig. 1 in the corresponding columns, it can be seen in Example 2 that the left bars, which represent the state of the art, with a slab preheating temperature of 1 270 and a roll end temperature of 920 ° C, do not have any key figures for maximum cold formability: the proof stress with 190 N / mm2, the elongation at break with 40% and the hardening exponent with 0.22 are not yet optimal.
  • the values of the strip produced according to the invention are considerably more favorable: despite its scarce alloy: lower yield strength with 160 N / mm2; significantly higher elongation at break and better fastening exponent as a result of the low slab preheating temperature and the final roll temperature of 920 ° C.
  • Example 3 the material characteristics shown in Example 3 are less favorable in the manufacturing process according to the prior art; in contrast, they are significantly improved by the manufacturing process according to the invention.
  • Claim 8 relates to the use of the method according to the invention using the continuous strip drawing yards known per se.
  • Claims 9 and 10 relate to the connection of the manufacturing method according to the invention with a known aging treatment or with the application of a metallic protective coating in the melt flow.
  • the combination according to the invention of the process steps mentioned leads to the fact that cold-rolled strip steels can be produced more reliably with improved productivity and with improved cold formability for specific purposes.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP86109521A 1985-08-10 1986-07-11 Procédé de fabrication de bandes en acier résistant au vieillissement et apte au formage à froid Expired - Lifetime EP0216044B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86109521T ATE104362T1 (de) 1985-08-10 1986-07-11 Verfahren zum herstellen eines alterungsbestaendigen bandstahles mit hoher kaltumformbarkeit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3528782 1985-08-10
DE19853528782 DE3528782A1 (de) 1985-08-10 1985-08-10 Verfahren zum herstellen eines alterungsbestaendigen bandstahles mit hoher kaltumformbarkeit

Publications (4)

Publication Number Publication Date
EP0216044A2 true EP0216044A2 (fr) 1987-04-01
EP0216044A3 EP0216044A3 (en) 1989-06-14
EP0216044B1 EP0216044B1 (fr) 1994-04-13
EP0216044B2 EP0216044B2 (fr) 1997-09-03

Family

ID=6278246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109521A Expired - Lifetime EP0216044B2 (fr) 1985-08-10 1986-07-11 Procédé de fabrication de bandes en acier résistant au vieillissement et apte au formage à froid

Country Status (3)

Country Link
EP (1) EP0216044B2 (fr)
AT (1) ATE104362T1 (fr)
DE (2) DE3528782A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2810245B2 (ja) * 1991-01-25 1998-10-15 日本鋼管株式会社 プレス成形性および燐酸塩処理性に優れた冷延鋼板およびその製造方法
JP3422612B2 (ja) * 1996-01-19 2003-06-30 Ｊｆｅスチール株式会社 極低炭素冷延鋼板の製造方法
DE19701443A1 (de) * 1997-01-17 1998-07-23 Thyssen Stahl Ag Stahl
DE19740148C1 (de) 1997-09-12 1999-07-15 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von beulfesten einbrennlackierten Bauteilen aus alterungsempfindlichem Stahl
DE19834361A1 (de) * 1998-07-30 2000-02-03 Schaeffler Waelzlager Ohg Bauteil, insbesondere Wälzlager- und Motorenbauteil
DE19840788C2 (de) * 1998-09-08 2000-10-05 Thyssenkrupp Stahl Ag Verfahren zur Erzeugung von kaltgewalzten Bändern oder Blechen
DE19946889C1 (de) * 1999-09-30 2000-11-09 Thyssenkrupp Stahl Ag Verfahren zum Erzeugen von alterungsbeständigen Bändern aus einem aluminiumberuhigten Stahl
DE10020118B4 (de) * 2000-04-22 2009-11-12 Schaeffler Kg Wälzlagerbauteil
CN107099648A (zh) * 2017-06-27 2017-08-29 中国航空工业集团公司沈阳飞机设计研究所 激光沉积成形a‑100钢的组织性能均匀化热处理方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7412582A (nl) * 1974-09-24 1976-03-26 Armco Steel Corp Werkwijze voor de vervaardiging van koudgewalst en ontlaten staalplaat.
JPS5849627B2 (ja) * 1979-02-27 1983-11-05 川崎製鉄株式会社 非時交性冷延鋼板の製造方法
JPS5857492B2 (ja) * 1980-09-25 1983-12-20 新日本製鐵株式会社 自動車用高強度冷延鋼板の製造方法
DE3170723D1 (en) * 1981-08-25 1985-07-04 Nippon Steel Corp Dual-purpose plant for producing cold rolled steel sheet and hot-dip galvanized steel sheet
JPS6045689B2 (ja) * 1982-02-19 1985-10-11 川崎製鉄株式会社 プレス成形性にすぐれた冷延鋼板の製造方法
US4504326A (en) * 1982-10-08 1985-03-12 Nippon Steel Corporation Method for the production of cold rolled steel sheet having super deep drawability
US4473411A (en) * 1983-07-20 1984-09-25 Armco Inc. Process of making aluminum killed low manganese deep drawing steel

Also Published As

Publication number Publication date
DE3689781D1 (de) 1994-05-19
EP0216044A3 (en) 1989-06-14
EP0216044B1 (fr) 1994-04-13
DE3528782A1 (de) 1987-02-19
EP0216044B2 (fr) 1997-09-03
ATE104362T1 (de) 1994-04-15
DE3528782C2 (fr) 1990-06-13

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