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研究了高Nb超低碳贝氏体钢在HTP工艺条件下轧态、回火态的组织与力学性能。采用的合金成分(质量分数)为:C 0.05%、Mn 1.85%、Nb 0.1%左右,其余合金元素有Cu、Ni、Cr、B等。进行了热模拟研究、实验室冶炼轧制和工业试制。试验结果表明,第二阶段开轧温度、冷却速度和轧后高温回火工艺对钢的组织、析出物的形态和数量有明显影响。采用合适的HTP工艺与轧后高温回火相结合,能够生产出屈服强度达到700 MPa级别的高强度、高韧性钢板。
The microstructure and mechanical properties of high Nb ultra-low carbon bainitic steels in the as-cast and tempered states under HTP process were studied. The alloy composition (mass fraction): C 0.05%, Mn 1.85%, Nb about 0.1%, the remaining alloying elements are Cu, Ni, Cr, B and so on. Thermal simulation studies, laboratory smelting rolling and industrial trial. The test results show that the second stage of rolling temperature, cooling rate and post-rolling high temperature tempering process on the microstructure and precipitation of steel have a significant impact on the shape and quantity. The combination of a suitable HTP process and high temperature tempering after rolling can produce high strength, high toughness steel plates with a yield strength of 700 MPa.