特钢技术
特鋼技術
특강기술
SPECIAL STEEL TECHNOLOGY
2013年
2期
26-30
,共5页
TP347H%连铸%含Nb脆性质点%内壁微裂纹
TP347H%連鑄%含Nb脆性質點%內壁微裂紋
TP347H%련주%함Nb취성질점%내벽미렬문
P347H%Continuous casting%Brittle particles with Nb%Micro cracks on inner surface
本文对TP347H连铸坯生产的荒管内壁出现毛细裂纹缺陷进行分析和探讨，通过光学显微镜、SEM观察发现，在裂纹附近及裂纹中存在较多的含Nb脆性质点。通过提高连铸坯均热温度，减少含Nb脆性质点的析出，进而减少了连铸TP347H在热穿孔后内壁毛细裂纹。
本文對TP347H連鑄坯生產的荒管內壁齣現毛細裂紋缺陷進行分析和探討，通過光學顯微鏡、SEM觀察髮現，在裂紋附近及裂紋中存在較多的含Nb脆性質點。通過提高連鑄坯均熱溫度，減少含Nb脆性質點的析齣，進而減少瞭連鑄TP347H在熱穿孔後內壁毛細裂紋。
본문대TP347H련주배생산적황관내벽출현모세렬문결함진행분석화탐토，통과광학현미경、SEM관찰발현，재렬문부근급렬문중존재교다적함Nb취성질점。통과제고련주배균열온도，감소함Nb취성질점적석출，진이감소료련주TP347H재열천공후내벽모세렬문。
This article analyzed and discussed the cause of the formation of capillary crack on the inner surface of the casting TP347 pierced billet. The observation under the optical microscope and SEM indicated that there were more brittle particles with Nb near the crack and in the crack. The measure for improving the casting billet soaking temperature was taken to reduce the precipitation of the brittle particles with Nb, so the capillary crack in the casting TP347 was reduced after hot piercing .
