首钢X80钢级站场和热煨弯管用钢的研发  

Development of Shougang X80 Pipeline Plate for Station and Hot-Bending

作　　者：李少坡 姜中行 李永东 许晓东[2] 白学军[2] 

机构地区：[1]技术研究院 [2]秦皇岛首秦金属材料有限公司

出　　处：《首钢科技》2011年第6期14-20,共7页Shougang Science and Technology

摘　　要：采用热模拟试验，利用金相组织观察以及析出物透射电镜分析等手段，对比研究了不同合金成分体系对贝氏体相变规律的影响，并进行了加热过程铌的固溶与奥氏体晶粒长大的控制技术研究以及不同工艺制度下微细析出相控制技术研究。研究结果表明，结合发挥显著作用的合金元素钼和铬等来弥补钢板心部冷却不足，可以促进全壁厚匀质贝氏体相变组织的形成。加热制度对铌的固溶和奥氏体晶粒长大控制至关重要，合理的加热工艺可有效改善奥氏体晶粒尺寸。通过控制轧制过程的形变温度和加速冷却过程的冷却速度，可使轧制过程的应变诱导析出相和相变过程的析出相更加弥散、细小，从而在提高钢材强度的同时改善钢材的韧性。In this paper, hot simulation test, metallography observation, TEM analysis of precipitate and other methods are used to study the effect of different alloy designs on bainite transformation. The niobium solution and austenitie grain control technology in heating process, and refined precipitation behaviour are studied under different processes. The results show that by adding Mo, Cr and other alloy elements, the weakness of cooling ability in the plate center can be made up, and the formation of the whole wall thickness of bainite microstructure can be pormoted. Slab reheating processes are very important to niobium solution and inhibit austenite grain coarsening, reasonable heating process can effectively improve the size of austenite grain. By controlling the rolling temperature and the water cooling rate, the precipitation phases during rolling and cooling process are dispered and smaller, thus improving the strength and toughness of the plate.

关 键 词：X80钢级 站场用钢 热煨弯管 低温韧性 

分 类 号：TG142.33[一般工业技术—材料科学与工程]