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Influence of Direct Quenching on Microstructure and Mechanical Properties of Steel Plate for Large Oil Storage Tanks

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Abstract

The influence of direct quenching on microstructure and mechanical properties of high performance steel plates for large oil storage tanks was studied. The direct quenched and tempered (DQ&T) steel plates were rolled at different finish rolling temperatures (1113 and 1173 K), and their microstructures and mechanical properties were compared with those of reheat quenched and tempered (RQ&T) steel plate. The optical microscopy of the DQ steel shows deformed grains elongated along the rolling direction, while complete equiaxed grains are visible in RQ steel. Transmission electron microscopy (TEM) of the DQ steel shows refined lath martensite with high density of dislocations, which acts as preferred precipitation sites for NbC or Nb(C,N) particles during tempering. In all the plates, strength decreases with increasing tempering temperature. The strength of RQ steel increased significantly compared with that of DQ steel at the higher tempering temperature, which leads to better tempering resistance in DQ steels. The optimum combination of strength and toughness (yield strength (YS) reaches 585 MPa, tensile strength (TS) 667 MPa, and Charpy impact energy at 253 K of 291 J) in the DQ steels is achieved by quenching at 1113 K and tempering at 923 K.

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Acknowledgment

This study was supported by the National Natural Science Foundation of China (No. 50474015).

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Authors and Affiliations

  1. State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang, 110004, Liaoning, China

    Guizhi Xiao, Hongshuang Di, Fuxian Zhu & Bingzhang Chen

  2. The Second Steel Rolling Plant, Chengde Xinxin Vanadium and Titanium Stock Co. Ltd., Chengde, 067002, Hebei, China

    Bing Qiu

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  1. Guizhi Xiao
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  2. Hongshuang Di
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  3. Fuxian Zhu
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  4. Bingzhang Chen
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Correspondence to Guizhi Xiao.

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Xiao, G., Di, H., Zhu, F. et al. Influence of Direct Quenching on Microstructure and Mechanical Properties of Steel Plate for Large Oil Storage Tanks. J. of Materi Eng and Perform 19, 868–872 (2010). https://doi.org/10.1007/s11665-009-9548-x

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  • DOI: https://doi.org/10.1007/s11665-009-9548-x

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