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Cold-rolled and recrystallisation annealed flat steel product, and method for production thereof

A technique of crystallization annealing, flat steel, used in the manufacture of tools, coatings, furnace types, etc.

Active Publication Date: 2017-05-31
THYSSENKRUPP STEEL EURO AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, this leads to the result that flat steel products of the type in question with typical dimensions for automobiles can currently only be produced with the required operational reliability at great expense

Method used

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  • Cold-rolled and recrystallisation annealed flat steel product, and method for production thereof
  • Cold-rolled and recrystallisation annealed flat steel product, and method for production thereof
  • Cold-rolled and recrystallisation annealed flat steel product, and method for production thereof

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Experimental program
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Embodiment Construction

[0120] The cold-rolled, roll-hardened flat steel products are supplied in the form of steel strips B1-B12 consisting of steel materials S1-S6 with the compositions given in Table 1.

[0121] These flat steel products are heat treated in different sizes in a continuously operating RTF type heat treatment furnace, then cooled to room temperature and subsequently temper rolled in-line.

[0122] The heat treatment includes recrystallization annealing, in which the steel strips B1-B12 are heated to a holding temperature T1 of 835° C.±15° C., where they are held for a holding time of 60 s.

[0123] After recrystallization annealing, steel strips B1-B12 were overaged. For this, they were cooled from the holding temperature T1 to the overaging initiation temperature T2 of 530±15° C. at a cooling rate CR1 of 8.5° C. / s.

[0124] The steel strips B1-B12 are then cooled from this temperature to an overaging end temperature T3 of 280±15° C. over an overaging duration t2 of 302 seconds. T...

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PUM

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Abstract

The invention relates to a cold-rolled and recrystallisation annealed flat steel product with a ferritic micro-structure, having an optimised formability and suitability for painting. In addition, the flat steel product is formed by a steel having C: 0.0001-0.003 wt.%, Si: 0.001-0.025 wt.%, Mn: 0.05-0.20 wt.%, P: 0.001-0.015 wt.%, Al: 0.02-0.055 wt.%, Ti: 0.01-0.1 wt.%, as well as respectively optionally Cr: 0.001-0.05 wt.%, V: up to 0.005 wt.%, Mo: up to 0.015 wt.%, N: 0.001-0.004 wt.%. In addition, the flat steel product has the following mechanical characteristics: Rp0.2 < / = 180 MPa, Rm < / = 340 MPa, A80 < / = 40%, n-value < / = 0.23. Furthermore, on at least one of the surfaces thereof, the flat steel product has an arithmetic roughness average Ra of 0.8-1.6 [mu]m and a peak value RPc of 75 / cm. The production of the flat steel product involves, in a continuous process in a N2-H2- annealing atmosphere, the recrystallisation annealing thereof, and an overaging process. Subsequently, the flat steel product undergoes a skin-pass rolling by means of a working roller and with a skin-pass rate D of 0.4-0.7%, the circumferential surface of which working roller has a roughness average Ra of 1.0-2.5 [mu]m and a peak value RPc > / = 100 / cm, wherein the peaks and depressions shaped into the surface of the skin-pass working roller are provided in a stochastically distributed manner.

Description

technical field [0001] The invention relates to a cold rolled and recrystallized annealed flat steel product with a ferrite structure. [0002] Flat steel products of this type are used in particular in the field of automobile body construction, where particularly high demands are placed on the formability and visual appearance of components formed from such flat steel products. [0003] If flat steel products are mentioned here, these are rolled products such as steel strips or steel sheets or cut-offs and slabs derived therefrom. [0004] Furthermore, the invention also relates to a method for producing a flat steel product of the above-mentioned type. Background technique [0005] If nothing else is stated below regarding the contents of the alloys, the contents are always relative to the weight. Conversely, statements about the composition of the atmosphere are always relative to the volume, unless otherwise specified. [0006] Flat steel products intended for body co...

Claims

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Application Information

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IPC IPC(8): C21D8/04C22C38/00C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18
CPCC21D8/0442C21D8/0473C21D9/46C22C38/004C22C38/02C22C38/04C22C38/06C21D2211/005C22C38/001C22C38/008C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C21D8/0436C22C38/14C21D8/0447C25D3/22
Inventor 马克·布卢梅瑙约尔格·斯泰布鲁纳乌多·措赫尔
Owner THYSSENKRUPP STEEL EURO AG
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