Influence of pass reduction ratio on microstructure and properties of 2205/Q235B clad steel plate
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ORIGINAL PAPER
Influence of pass reduction ratio on microstructure and properties of 2205/Q235B clad steel plate Feng-qiang Xiao1,2,3 • Dong-po Wang1,2 • Wen-bin Hu1 • Lei Cui1,2 • Zhi-ming Gao1 • Lan-ju Zhou4 Received: 30 July 2019 / Revised: 3 September 2019 / Accepted: 9 September 2019 China Iron and Steel Research Institute Group 2020
Abstract 2205/Q235B clad steel plates were fabricated using a thermal simulator. The metallographic microscope, scanning electron microscope, energy-dispersive spectrometer, shear test, electrochemical corrosion test and acid immersion test were used to study the influence of the pass reduction ratio on the microstructure and properties of 2205/Q235B clad steel plate. The results show that the clad steel plates had a good bonding surface when the pass reduction ratios were between 16.3% and 36.0%. There existed the mutual diffusion effect of elements near the bonding surface, which caused the long austenite strip on the side of 2205 stainless steel and the decarburization layer on the side of Q235B low-carbon steel. The transformation of d ferrite to c austenite and the generation of the decarburization layer were promoted because of the lower pass reduction ratio. The corrosion resistance of 2205 duplex-phases stainless steel worsened by the decrease in d ferrite content. The increase in the decarburization layer thickness made the shear strength of the clad steel plates reduce from 453 to 390 MPa. The potential of the decarburization layer was lower than that of 2205 stainless steel and Q235B low-carbon steel, which was easily corroded in the corrosive medium. Keywords 2205/Q235B clad steel plate Pass reduction ratio d ferrite Decarburization layer Shear strength
1 Introduction Although the comprehensive performance requirements of stainless steel (corrosion resistance and strength) in the industrial environment are continuously improved, the traditional steels such as 304 and 316L steels have not been able to meet the industrial requirements. Compared with traditional austenitic stainless steel, duplex stainless steel has better resistance against chloride stress corrosion, better weldability and better mechanical properties [1–3].
& Dong-po Wang [email protected] 1
School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
2
Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300350, China
3
Shandong High-tech Investment Corporation, Jinan 250101, Shandong, China
4
Shandong Iron & Steel Group Co., Ltd., Jinan 250101, Shandong, China
The use of duplex stainless steel could reduce the cost of corrosion-resistant materials, improve the economic benefits of engineering projects and increase the reliability of industrial equipment due to its superior performance [4, 5]. The linear expansion coefficient of 2205 duplex stainless steel is lower than that of austenitic stainless steel and close to that of carbon steel. Therefore, 2205 duplex stainless steel is
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