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| Development of Low C Hot-Rolled Formable Strip Steel With Yield Strength of 700MPa |
| BAI Xiao-hong,LIU Dong-sheng |
| Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China |
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Abstract A low carbon SiMnTiNb ultra-high strength hot-rolled strip steel with yield strength of 700MPa was developed by thermo-mechanically controlled processing (TMCP) on a conventional 1450mm hot strip production line. Continuous cooling transformation (CCT) diagram of the industrially produced steel was constructed. Precipitation-hardening behavior was analyzed by the hardening response of a series of aging experiment. Mechanical properties, cold bending property, and weldablity of the industrially rolled strip were tested. The microstructure of the strip consists of fine ferrite grains sized at 4-5μm containing precipitates of Nb-Ti, bainite and martensite. The ultra-high strength is attributed to grain refinement, precipitation and phase transformation hardenings，etc. Cold bendability and welding properties are satisfactory.
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Received: 08 October 2012
Published: 18 July 2013
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2013, Vol. 48 
