Rolling method for enhancing ferritic stainless steel surface wrinkling resistance

A stainless steel and wrinkle resistance technology is applied in the rolling field to improve the surface wrinkle resistance of ferritic stainless steel. Improved wrinkle height and uniform grain size

Active Publication Date: 2015-09-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by the method provided above, the rolling process and the rolling rhythm time are increased, and the production efficiency is reduced

Method used

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  • Rolling method for enhancing ferritic stainless steel surface wrinkling resistance
  • Rolling method for enhancing ferritic stainless steel surface wrinkling resistance
  • Rolling method for enhancing ferritic stainless steel surface wrinkling resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A hot-rolled annealed plate with a thickness of 2.87 mm was selected, and then the test plate was cold-rolled on a two-roll mill.

[0027] In order to achieve the purpose of asynchronous rolling, different roll diameter configurations are used in cold rolling to achieve asynchronous rolling. At the same time, a group of synchronous rolling with the same roll diameter ratio was selected for comparison. The specific method and cold rolling process of the rolls are shown in Table 1.

[0028] Table 1

[0029] Simultaneous rolling Speed ​​ratio 1.11 Speed ​​ratio 1.20 Roll diameter configuration (mm / mm) 100 / 100 90 / 100 100 / 120 Original thickness (mm) 2.87 2.87 2.87 Final rolling thickness (mm) 0.57 0.60 0.57 Reduction rate 80.1％ 79.1％ 80.1％

[0030] The above-mentioned cold-rolled sheets of different processes were annealed, the annealing temperature was 880° C., and the annealing time was 2 minutes.

[0031] Annealed sh...

Embodiment 2

[0034] Embodiment 2: A rolling method for improving wrinkling resistance on the surface of ferritic stainless steel, which is suitable for adding Nb and Ti stabilizing elements containing 16%-22% of Cr content and ultra-pure stainless steel with C+N content≤0.02%. Ferritic stainless steel, including the following steps:

[0035] Step 1, carrying out hot rolling treatment to cast slab;

[0036] Step 2, carrying out annealing and pickling treatment to the hot-rolled plate;

[0037] Step 3, cold rolling by asynchronous rolling method: the hot-rolled annealed and pickled plate is subjected to asynchronous rolling and cold rolling, the asynchronous rolling speed ratio is between: 1.50, and the total rolling reduction is 90%;

[0038] Step 4, cold rolling and annealing: the steel plate obtained by asynchronous rolling and cold rolling is subjected to annealing treatment, the annealing temperature is 1000° C., and the annealing time is 1 min.

Embodiment 3

[0039] Embodiment 3: A rolling method for improving wrinkling resistance on the surface of ferritic stainless steel, which is suitable for adding Nb and Ti stabilizing elements containing 16%-22% of Cr and ultra-pure stainless steel with C+N content≤0.02%. Ferritic stainless steel, including the following steps:

[0040] Step 1, carrying out hot rolling treatment to cast slab;

[0041] Step 2, carrying out annealing and pickling treatment to the hot-rolled plate;

[0042] Step 3, cold rolling by asynchronous rolling method: the hot-rolled annealed and pickled plate is subjected to asynchronous rolling and cold rolling, the asynchronous rolling speed ratio is between: 1.05, and the total rolling reduction is 75%;

[0043] Step 4, cold rolling and annealing: the steel plate obtained by asynchronous rolling and cold rolling is annealed, the annealing temperature is 840° C., and the annealing time is 4 minutes.

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Abstract

The invention relates to a rolling method for enhancing ferritic stainless steel surface wrinkling resistance. The rolling method comprises the steps of: 1) conducting hot rolling treatment on the casting blank; 2) conducting annealing pickling on the hot rolled steel sheet; 3) conducting cold rolling on the hot-rolled annealed and pickled steel sheet by an asynchronous rolling way, and controlling the total rolling reduction and cold rolling; and 4) conducting annealing treatment on the steel sheet obtained from asynchronous cold rolling by using a reasonable annealing process system. Through the above process, the surface roughness Pa and the maximum wrinkling height Pt of the steel sheet are improved substantially; and the method is quite effective in improving the surface wrinkling of medium-chromium series ultra-pure ferrite stainless steel, which is supplemented with Nb and Ti stabilizing elements and contains about 16% of Cr.

Description

technical field [0001] The invention relates to a rolling method for improving wrinkling resistance on the surface of ferritic stainless steel. technical background [0002] Ferritic stainless steel generally does not contain nickel or only contains a small amount of nickel. It is a nickel-saving stainless steel. It has low cold hardening tendency, large thermal conductivity, small linear expansion coefficient, and excellent stress corrosion resistance. It is used in kitchen equipment, automobiles, etc. Industry, power-on products, electronic equipment and other fields have a wide range of applications and broad development prospects. However, compared with austenitic stainless steel, its formability is poor, especially the surface wrinkling is serious, which seriously affects the aesthetic quality of the product, so its use is sometimes greatly limited. [0003] There have been several theories about the wrinkling defects and causes of ferritic stainless steel processing: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02
Inventor 李静媛方智
Owner UNIV OF SCI & TECH BEIJING
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