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| Development of a New Weathering Steel With Yield Strength of 450 MPa |
| GUO Hui-ying, ZHANG Yu, WANG yin-bai, XU Hong-mei |
| Institute of Research of Iron and SteelIRIS, Shasteel, Zhangjiagang 215625, Jiangsu, China |
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Abstract 20 mm thick yield strength 450 MPa weathering steel was successfully hot rolled based on continuous cooling transformation (CCT) behavior study, and its microstructure, mechanical properties, corrosion-resistance and weldability were analyzed. Both CCT and hot rolling test results suggest that a combination of finish rolling temperature of about 850 ℃, thickness reduction ratio≥0.6, cooling rate of between 15-30 ℃/s and cooling finish temperature ≤ 579 ℃ resulted in a plate consisting of polygonal ferrite (3-10 μm), degenerate pearlite and small amounts of M-A. The rolled plate exhibited a yield strength of 458 MPa, and tensile strength of 557 MPa, elongation ≥ 28% and impact absorbed energy ≥ 287 J at －60 ℃. The excellent low temperature toughness was derived from the small effective grain size of and high proportion of high-angle boundary. 72 h periodical dry-wet immersion corrosion test in NaHSO3 and NaCl solutions show that the corrosion resistance of the hot rolled plate was 49% and 40% higher than Q345B, respectively. Submerged arc welding with heat input of 30 kJ/cm was employed to the hot-rolled plate, and the heat affected zone shows an impact absorbed energy ≥ 156 J at －40 ℃.
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Received: 21 January 2014
Published: 02 November 2014
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2014, Vol. 49 
