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Method for mfg. of strips of stainless steel and integrated rolling mill line

A technology for stainless steel strips and rolling lines, which can be used in metal rolling, metal rolling, manufacturing tools, etc., and can solve complex problems

Inactive Publication Date: 2005-02-09
OUTOKUMPUSINLESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One object of the present invention is to solve the above-mentioned complex problems

Method used

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  • Method for mfg. of strips of stainless steel and integrated rolling mill line
  • Method for mfg. of strips of stainless steel and integrated rolling mill line
  • Method for mfg. of strips of stainless steel and integrated rolling mill line

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Embodiment Construction

[0011] In the accompanying drawings, Figure 1A schematically shows some different methods for producing stainless steel strip, preferably austenitic stainless steel strip or ferritic stainless steel strip, which constitutes the required later Figure 1B Raw material processed in rolling lines in Figure 1B The rolling line B is used to implement the method involved in the present invention. Ferritic-austenitic steel strip is also possible. Three methods for producing the starting material are shown in Figure 1A. According to method I, the slab 1 is hot-rolled in a hot-rolling line to produce a hot-rolled strip having a thickness conventional for hot-rolled strip, ie 1.5-6 mm. According to one aspect of the invention, the hot rolling is stopped before or at the latest when the thickness has dropped to 2.5 mm, i.e. to obtain a strip with a thickness between 3-6 mm, preferably at Between 3mm and 5mm. In a quenching section 3 the hot-rolled strip can be quenched to a temperatu...

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Abstract

A strip of stainless steel, which is cast and / or hot rolled and which is dark colored by oxides on the surface of the strip, remaining from the foregoing manufacture of said cast and / or hot rolled strips, is cold rolled in one or more cold rolling passes (11-13) following after each other, so that the thickness of the strip is reduced by 10-75% and so that the oxide scales crackle, i.e. so that fissures are established in the oxide layers. Thereafter, the strip is annealed in a furnace (18) having a furnace atmosphere obtainable by heating the furnace by means of burners which consume a liquid or gaseous fuel, which is combusted by means of a gas which contains at least 85 % oxygen and not more than 10% nitrogen, wherein a furnace atmosphere is created, in which the strip can be annealed without oxidising the metal surfaces which are exposed through the crackling, in a way which would make the subsequent descaling and pickling difficult.

Description

technical field [0001] The invention relates to a method for the production of stainless steel strip, the method comprising cold rolling the strip produced in a preceding process using cast strip and / or hot rolling the strip material. The invention also relates to a rolling line for carrying out the method. Background technique [0002] Cold rolling stainless steel strip serves one or several purposes. The basic purpose is usually to reduce the thickness of the original strip, which is usually rolled in a previous hot rolling line to a thickness that the hot rolled strip has, which is not less than 1.5 mm, usually between 2- 4mm, but also up to 6mm. Improving the strength of the strip can also be used as the main purpose of cold rolling or as an incidental purpose. [0003] Usually also for the treatment of steel strips in integral rolling lines to obtain strips with certain surface characteristics. Cold rolling, annealing and pickling cooperate in this respect and infl...

Claims

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Application Information

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IPC IPC(8): B21B3/02B21B1/22B21B1/26B21B1/28B21B1/46B21B15/00B21B45/00B21B45/06C21D8/02C21D9/46C21D9/52
CPCB21B1/46B21B2001/228C21D8/0205C21D8/0273B21B1/26C21D8/0236B21B45/06B21B45/004B21B3/02B21B1/28C21D8/0278B21B2015/0071B21B15/0085
Inventor 斯滕·扬加斯
Owner OUTOKUMPUSINLESS
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