山东冶金
山東冶金
산동야금
SHANDONG METALLURY
2013年
5期
37-39
,共3页
徐志刚%刘勇%张迎涛%马兴涛%高文娟
徐誌剛%劉勇%張迎濤%馬興濤%高文娟
서지강%류용%장영도%마흥도%고문연
热轧棒材%30Mn2%表面裂纹%鬼线组织%夹杂物%卷渣
熱軋棒材%30Mn2%錶麵裂紋%鬼線組織%夾雜物%捲渣
열알봉재%30Mn2%표면렬문%귀선조직%협잡물%권사
hot rolled bar%30Mn2%surface crack%ghost line structure%inclusion%slag entrapment
针对30Mn2热轧棒材表面出现裂纹缺陷的问题，取样进行了成分、性能、显微组织及能谱分析。结果表明，材料的成分及性能均符合设计要求，裂纹内存在较大的残留气泡及夹杂物，基体存在由P偏析导致的带状组织即鬼线组织，夹杂物包含保护渣成分。结晶器卷渣是导致轧材出现纵向裂纹的主要原因。通过更换保护渣及优化加入方式等，避免了30Mn2轧材表面裂纹和鬼线组织等缺陷的再次产生。
針對30Mn2熱軋棒材錶麵齣現裂紋缺陷的問題，取樣進行瞭成分、性能、顯微組織及能譜分析。結果錶明，材料的成分及性能均符閤設計要求，裂紋內存在較大的殘留氣泡及夾雜物，基體存在由P偏析導緻的帶狀組織即鬼線組織，夾雜物包含保護渣成分。結晶器捲渣是導緻軋材齣現縱嚮裂紋的主要原因。通過更換保護渣及優化加入方式等，避免瞭30Mn2軋材錶麵裂紋和鬼線組織等缺陷的再次產生。
침대30Mn2열알봉재표면출현렬문결함적문제，취양진행료성분、성능、현미조직급능보분석。결과표명，재료적성분급성능균부합설계요구，렬문내존재교대적잔류기포급협잡물，기체존재유P편석도치적대상조직즉귀선조직，협잡물포함보호사성분。결정기권사시도치알재출현종향렬문적주요원인。통과경환보호사급우화가입방식등，피면료30Mn2알재표면렬문화귀선조직등결함적재차산생。
Aiming at the surface crack defects of 30Mn2 hot rolled bar, the sample was taken in defect position and the composition, properties, microstructure and energy spectrum were analyzed. The results showed that the material composition and performance met the design requirements, large bubbles and inclusions existed in crack inside, matrix existed in banded structure caused by phosphorus segregation (the ghost line structure), and inclusions contained slag composition. Crystallizer slag entrapment is the main cause resulted in appearing longitudinal crack in rolled bar. Through replacing protection slag and optimizing adding way, the emergence of the rolled 30Mn2 steel surface defects again such as cracks and ghost line structure was avoided.
