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本文研究了06MnNb钢中Mn、Nb含量,加热温度、轧制制度,轧后冷却等工艺因素与轧后组织性能的关系。采用低的加热温度、适合的轧制制度、轧后在780～600℃之间以每秒17℃冷速间断快冷,在06MnNb钢13mm厚的板带上既提高钢的屈服强度,又降低钢的脆性转化温度,并得到细小的针状铁素体(d<4μm),细小的M/A岛及少量粒状贝氏体的复合组织。研究了各类组织在断裂中对裂纹形成及裂纹扩展的作用;分析了各类组织对强度和低温韧性的作用。
In this paper, the relationship between the content of Mn and Nb, the heating temperature, the rolling system, the cooling after rolling and the microstructure and properties of 06MnNb steel were studied. Using low heating temperature, suitable rolling system, after rolling at 780 ~ 600 ℃ at a cooling rate of 17 ℃ per second cold intermittent, in 06MnNb steel 13mm thick strip not only increase the yield strength of steel, but also reduce Brittle transformation temperature of steel, and the composite microstructure of fine acicular ferrite (d <4μm), fine M / A island and small amount of granular bainite was obtained. The effects of various kinds of organizations on crack formation and crack propagation during fracture were studied. The effects of various kinds of structures on strength and low temperature toughness were also analyzed.