P91大口径厚壁无缝钢管热处理晶粒细化现场工艺分析  

ANALYSIS ON THE GRAIN REFINEMENT IN THE HEAT TREATMENT PROCESS FOR P91 SEAMLESS STEEL TUBE WITH LARGE DIAMETER AND THICK WALL

作　　者：曹铜壁 

机构地区：[1]河北宏润重工股份有限公司,河北盐山061300

出　　处：《冶金信息导刊》2016年第5期22-26,共5页Metallurgical Information Review

摘　　要：通过研究分析，挤压态大口径厚壁P91毛管经扩氢和去应力退火不会发生晶粒组织再结晶，从而不能改变材料的晶粒大小和分布状态。因此，在结合较大挤压比和调整热处理工艺参数和现场工艺控制，P91毛管晶粒组织达到了均匀细化。一定的回火温度和时间下，淬火最后水冷管温是影响厚壁P91钢管晶粒组织细化工艺控制的关键因素，最后水冷管温越高，则越难以克服自身晶粒粗大组织的遗传性。当最后淬水温度降到150℃时，回火组织转变驱动力充足，材料内部多边形化回复形成细小均匀的亚晶粒组织，晶粒度达到8．5级．Through research and analysis, the extrusion state of large diameter and thick wall P91 pierced shell after diffusion hydrogen and stress relief annealing does not appear grain recrystallization, and thus the grain size and distribution of materials can＇ t be changed. Therefore, in combination with larger extrusion ratio and adjustment parameters of the heat treatment process and process control, the grain structure of Pgl pierced shell is uniformly refined. Under the tempering temperature and time, final cooling tube temperature after quenching is the key influence factor on the grain refining process control for P91 steel tube, the final cooling tube temperature is higher, the more difficult to overcome the heredity of itself coarse grain structure. When the final quenching water temperature drops to 150℃ , the driving force of tempering structure transformation is sufficient, material internal polygonization recovers and forms fine and uniform subgrain structure with grain size at 8.5 level.

关 键 词：晶粒粗大 组织遗传性 多边形化 最后水冷管温 亚晶粒 驱动力 板条马氏体 

分 类 号：TG162.84[金属学及工艺—热处理]