超高强捆带钢试验研究

Experimental Study on Ultrahigh-strength Strapping Steel

探讨了利用环保的连续退火技术生产抗拉强度1 350 MPa、断后伸长率12%超高强捆带钢的可行性。冶炼、热轧、酸洗、冷轧、连续热处理以及拉伸试验表明,采用新设计的成分可以获得达到上述性能要求的超高强捆带钢。微观组织观察、X射线衍射分析技术表明,该超高强捆带钢是以马氏体、残余奥氏体强韧化的。此外还探讨了连续热处理工艺参数对组织、性能的影响。

Ultrahigh-strength strapping steel is used for packing paper,tobacco and compressed cotton and wool. At present,there is only one company that can produce it through lead quenching. In this paper,the feasibility to produce a kind of ultrahigh-strength strapping steel with tensional strength of1 350 MPa and elongation of 12% by environmentally friendly continuous annealing process is investigated. The experiment results of steelmaking,hot rolling,pickling,cold rolling and continuous heat treatment show that the steel with the above-mentioned properties can be obtained by using the newly-designed chemical composition scheme. The microstructures and X-ray diffraction spectrum of the steel show that the steel is strengthened and toughened by martensite and residual austenitic. The effect of continuous heat treatment on microstructure and mechanical properties is also discussed.