大型夹杂物对管线钢探伤的影响.pdf

大型夹杂物对管线钢探伤的影响
魏立国朱岩
(宝山钢铁股份有限公司,上海 201900 )
摘要 X52 管线钢按正常工艺浇注、加热和轧制,其超声波探伤时出现批量不合格钢板。采用低倍、金相、扫描
电镜等分析了探伤不合格的原因, 证实钢中存在钙铝酸盐和硫化钙的大型复合夹杂, 是导致探伤不合格的主要原因。
基于此,提出了相应的工艺改进措施。
关键词管线钢超声波探伤精炼改进措施
Effect of Macro-inclusions on Ultrasonic Test of Pipeline Steel Steel Pipeline of Test Ultrasonic on Macro-inclusions of Effect
Wei Liguo Liguo Wei Yan Zhu
(Baoshan Iron and Steel Co.,Ltd., Shanghai, 201900) 201900) Shanghai, Co.,Ltd., Steel and Iron (Baoshan
Abstract Abstract are which plates, steel pipeline X52 the of number a Quite conventional by produced rolling and heating casting,
process process in a specific steel makingplant, arerejected by UST test).(ultrasonic Bytestin g the rejected plate sampleswith
macroscopic examination, metallographic analysis andanalysis metallographic examination, macroscopic that theSEM,itindicates by inplatesUSTresultspipelinerejected
the plex ofmacro-inclusions calcium aluminate with CaS. Based onthat, some relevant improvementmeasures are
proposed. proposed.
Key words Key measure improvement refine, secondary UST, steel, pipeline
1 1 引言
随着我国经济持续发展,能源结构的调整,石油、天然气输送用管线钢的需求量越来越大。油田、气田
分布广泛,管线钢服役条件也日趋恶化, 对质量和性能的要求也越来越高。不仅要求管线钢具有高强度,而
且要有良好的韧性、抗疲劳性能、耐腐蚀性和良好的抗氢致裂纹( HIC )性能[1] ;同时,随着管径的扩大,
对钢板内部质量也提出了更高的要求,需经过严格的超声波探伤。这些要求的实现是以钢质的高纯净度为前
提的。因此,选择合理的冶炼工艺,精确控制管线钢的成分和夹杂物形态, 配合以合理的控制轧制工艺,才
能生产出高洁净度、高品质、高性能的管线钢。
作为 API 系列中较高等