研究了高铌钢热加工过程显微组织演变特征和强韧性规律，结果表明，强烈的未再结晶区应变累积导致铁素体晶粒和贝氏体板条大幅度细化，实验室控轧HTP钢板综合力学性能可达到X80以上。利用高铌非Mo合金化和高温轧制技术成功生产了14 mm热连轧板(命名为HTP70)，室温组织以细小的先共析铁素体/针状铁素体为主，M/A 组元呈薄膜状均匀分布，含有一定量块状准多边形铁素体和极少量珠光体。强韧性能均达到或超过X70标准，并且具有优异的焊接性能。
The microstructural evolution of highNb steels during hotworking was investigated. It was demonstrated that, the size of ferrite grain and bainite lath is further reduced due to strong strain accumulation in nonrecrystallized region of austenite, and the mechanical properties of controlled rolled plates in laboratory can exceed X80 grade. The 14 mm high temperature proceseedplate (named HTP70) was industrially produced through the microalloying technology of Nb without Mo and high temperature process.The microstructure of the steel mainly consists of ultrafine polygonal ferrite, massive ferrite, acicular ferrite, thin martensite film at grain boundaries and little pearlite. The high strength,high toughness (>X70) and excellent welding performance can be obtained.
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