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Acta Metall Sin  2019, Vol. 55 Issue (5): 566-574    DOI: 10.11900/0412.1961.2018.00540
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Effect of Hot Band Annealing Processes on Texture and Formability of 19Cr2Mo1W Ferritic Stainless Steel
Houlong LIU,Mingyu MA,Lingling LIU,Liangliang WEI,Liqing CHEN()
1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
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Abstract  

Low-cost ferritic stainless steels with excellent oxidation resistance and anti-corrosion ability are widely used in the fields of household appliances, hardware decoration, architectural structures, fuel cells and automobile exhaust systems. In order to achieve good formability of the ferritic stainless steel, the annealing process of hot-rolled sheet is crucial. As a newly developed 444-type heat-resistant ferritic stainless steel containing W and Ce, however, the influence of hot band annealing process of 19Cr2Mo1W ferritic stainless steel on its formability is not clear and need to have a deep understanding. In this work, the effect of annealing temperature of hot band on the microstructure, texture and formability of this steel was studied by means of XRD, EBSD, roughness measurement and formability test. The results indicated that although annealing processes were carried out at different temperatures after hot rolling, the characteristic of texture in the hot-rolled and annealed sheet was inherited to the cold-rolled sheet to some extent. The increased intensities of {223}<11ˉ0> and {111}<01ˉ1> texture components in the hot-rolled and annealed sheet were beneficial to improvement of the γ-fiber texture in the cold-rolled and annealed sheet. The extent of deviation from γ-fiber texture in the cold-rolled and annealed sheet was increased with increasing the intensities of {001}<11ˉ0>~{115}<11ˉ0> texture components in the cold-rolled sheet. An increased annealing temperature of the hot-rolled sheet could effectively weaken the intensities of {001}<11ˉ0>~{115}<11ˉ0> texture components in the cold-rolled sheet. In addition, the banded microstructures in the hot-rolled and annealed sheet were significantly reduced by increasing annealing temperature of the hot-rolled sheet, which improved the microstructure uniformity and formability of the cold-rolled and annealed sheet.

Key words:  ferritic stainless steel      hot band annealing      cold rolling and annealing      texture      formability     
Received:  07 December 2018     
ZTFLH:  TG142.71  
Fund: National Natural Science Foundation of China and Baowu Steel Group Co., Ltd.(U1660205)
Corresponding Authors:  Liqing CHEN     E-mail:  lqchen@mail.neu.edu.cn

Cite this article: 

Houlong LIU,Mingyu MA,Lingling LIU,Liangliang WEI,Liqing CHEN. Effect of Hot Band Annealing Processes on Texture and Formability of 19Cr2Mo1W Ferritic Stainless Steel. Acta Metall Sin, 2019, 55(5): 566-574.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00540     OR     https://www.ams.org.cn/EN/Y2019/V55/I5/566

Fig.1  Constant φ2 =45° ODF section and the positions of the main orientations (φ1, Φ, φ2—Euler angles)
Fig.2  Constant φ2=45° ODF sections for central layers of hot-rolled ferritic stainless steel sheets annealed at 950 ℃ (a), 1000 ℃ (b), 1050 ℃ (c) and 1100 ℃ (d)Color online
Fig.3  Constant φ2=45° ODF sections for central layers of cold-rolled ferritic stainless steel sheets with hot band annealing at 950 ℃ (a), 1000 ℃ (b), 1050 ℃ (c) and 1100 ℃ (d)Color online
Fig.4  Constant φ2=45° ODF sections for central layers of cold-rolled and annealed ferritic stainless steel sheets with hot band annealing at 950 ℃ (a), 1000 ℃ (b), 1050 ℃ (c) and 1100 ℃ (d)Color online
Fig.5  Orientation imaging maps of hot-rolled ferritic stainless steel bands annealed at 950 ℃ (a), 1000 ℃ (b), 1050 ℃ (c) and 1100 ℃ (d) (ND—normal direction, RD—rolling direction)Color online
Fig.6  Orientation imaging maps of the cold-rolled and annealed ferritic stainless steel sheets with hot band annealing at 950 ℃ (a), 1000 ℃ (b), 1050 ℃ (c) and 1100 ℃ (d)Color online

Annealing temperature

rˉ

Δr

Ra

μm

Rt

μm

δ

%

n

σ0.2

MPa

σb

MPa

9501.270.351.7010.5126.30.20403627
10001.360.231.348.2427.90.21396613
10501.62-0.090.926.1729.50.21394610
11001.720.160.896.1430.30.20390600
Table 1  Formability and mechanical properties of cold-rolled and annealed sheets with different annealing processes of hot-rolled band
Fig.7  Roughness profiles of cold-rolled and annealed sheets with hot band annealing at 950 ℃ (a), 1000 ℃ (b), 1050 ℃ (c) and 1100 ℃ (d)
Fig.8  Stress-strain curves of cold-rolled and annealed steels with hot band annealing at various temperatures
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