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钢中加入稀土元素能改变非金属夹杂物的组成及其形态,有效地改善钢的各向异性,大幅度地提高钢材的横向冲击值及减少焊接结构中层状撕裂的产生。因此,近年来在石油和天然气输送管道用钢、近海采油平台用钢、压力容器用钢及各种深冲用钢方面均广泛采用稀土元素,以改进钢材各向异性,提高钢的工艺性能。虽然用控制夹杂物形状来改善钢材横向冲击值的观点早已为大家所接受。但在所发表的资料中有关夹杂物形态变化和冲击值的依赖关系的报导则很少,多数都以RE/S来表示横向冲击韧性最佳值。实验结果比较分散,数据也各不相同,其最佳值范围是
Rare earth elements added to the steel can change the composition and morphology of non-metallic inclusions, effectively improve the anisotropy of steel, greatly improve the transverse impact value of steel and reduce the occurrence of lamellar tearing in the welded structure. Therefore, in recent years, rare earth elements have been widely used in steel for oil and gas pipeline, offshore oil platform steel, pressure vessel steel and various deep-drawn steel to improve steel anisotropy and improve the technological performance of steel. Although the control of inclusion shape to improve the value of steel transverse impact value has long been accepted by everyone. However, there are few reports on the dependence of the inclusion morphology and the impact values in the published data, and most of them show RE / S the best value of the transverse impact toughness. The experimental results are more scattered, the data are also different, the best value range is