低碳高铌合金设计在高等级管线钢生产中的理论与技术

【作者】 刘清友； 孙新军； 贾书君；

【机构】 钢铁研究总院；

【摘要】 本文研究了低碳高铌合金设计管线钢的奥氏体化行为、再结晶行为、相变行为、焊接性能,以及影响高钢级、厚规格管线钢韧性、特别是DWTT的主要因素等。研究结果表明,0.03C-0.10Nb钢在1180℃加热可保证Nb充分溶解;较高的Nb含量可有效抑制变形奥氏体再结晶且对再结晶奥氏体晶粒长大有明显的抑制作用,细化再结晶奥氏体晶粒尺寸,为精轧后变形奥氏体的充分扁平化创造有利条件,进而可获得充分细化的针状铁素体组织,实现钢的高强、高韧化。更多还原

【Abstract】 The metallurgical characteristics of low carbon high niobium pipeline steels,such as austenizing behavior,recrystallizing and transformation behavior,mechanical properties have been researched in this paper.It was revealed that Nb promotes acicular ferrite transformation, and restrains recrystallized austenite grain growth.As a result,a refined recrystallized austenite grain before finish rolling,and a pancaked sufficiently austenite grain after finish rolling,which is beneficial to improving the strength,Charpy V-Notch toughness and DWTT,could be obtained in the low carbon high niobium steels.So the low carbon high niobium alloy design is reasonable for producing X80 strip and plate.更多还原