宝钢技术
寶鋼技術
보강기술
BAOSTEEL TECHNOLOGY
2015年
4期
68-72
,共5页
合金焊丝钢%钢锭%中心孔洞%过热度
閤金銲絲鋼%鋼錠%中心孔洞%過熱度
합금한사강%강정%중심공동%과열도
alloy welding wire%steel ingot%center hole%superheating temperature
高强度合金焊丝钢广泛用于工程机械行业，具有残余元素低、纯净度高的特点，氢、氧、氮气体元素含量均要求严格，国内该系列焊丝材料主要依赖进口。为了进一步开拓系列高端焊丝钢市场，开发了新型高强度合金焊丝钢。生产过程发现模铸钢锭轧制后探伤不合格，取样发现初轧坯横截面低倍中心出现孔洞缺陷，影响材料质量。通过低倍试验和EPMA分析结合材料成分采用Thermo-Calc软件计算固液相线，分析发现钢种固液线差值相对较小是导致钢锭中心孔洞的主要原因。采用优化钢液浇注过热度和模铸浇注时补缩控制，避免了钢锭中心孔洞缺陷的产生。
高彊度閤金銲絲鋼廣汎用于工程機械行業，具有殘餘元素低、純淨度高的特點，氫、氧、氮氣體元素含量均要求嚴格，國內該繫列銲絲材料主要依賴進口。為瞭進一步開拓繫列高耑銲絲鋼市場，開髮瞭新型高彊度閤金銲絲鋼。生產過程髮現模鑄鋼錠軋製後探傷不閤格，取樣髮現初軋坯橫截麵低倍中心齣現孔洞缺陷，影響材料質量。通過低倍試驗和EPMA分析結閤材料成分採用Thermo-Calc軟件計算固液相線，分析髮現鋼種固液線差值相對較小是導緻鋼錠中心孔洞的主要原因。採用優化鋼液澆註過熱度和模鑄澆註時補縮控製，避免瞭鋼錠中心孔洞缺陷的產生。
고강도합금한사강엄범용우공정궤계행업，구유잔여원소저、순정도고적특점，경、양、담기체원소함량균요구엄격，국내해계렬한사재료주요의뢰진구。위료진일보개탁계렬고단한사강시장，개발료신형고강도합금한사강。생산과정발현모주강정알제후탐상불합격，취양발현초알배횡절면저배중심출현공동결함，영향재료질량。통과저배시험화EPMA분석결합재료성분채용Thermo-Calc연건계산고액상선，분석발현강충고액선차치상대교소시도치강정중심공동적주요원인。채용우화강액요주과열도화모주요주시보축공제，피면료강정중심공동결함적산생。
The high-strength alloy welding wire steel is used in engineering machinery industry , with low residual elements, high purity.And the hydrogen, oxygen, nitrogen contents were controlled in the high-strength alloy welding wire steel .In China , the supply of wire materials mainly relies on importation .New high-strength alloy steel wire was developed in order to explore the high-wire steel market in the future .During the production process , ingot was found unqualified after rolling , by macroscopic test , finding center hole in that bloom cross-section which affects the quality of materials .By macroscopic test , EPMA and Thermo-Calc calculation model , it was found that main reason for occurrence of ingot center hole is comparatively small difference of solid -liquid phase .By optimization of casting liquid steel superheat and ingot casting pouring feeding control , it avoided the ingot center hole defect in the high-strength alloy welding wire steel .
