大型铸锻件
大型鑄鍛件
대형주단건
Heavy Casting and Forging
2015年
6期
47-48
,共2页
大钢锭%高径比%锥度%过热度%浇注速度
大鋼錠%高徑比%錐度%過熱度%澆註速度
대강정%고경비%추도%과열도%요주속도
heavy ingot%height-diameter ratio%taper%overheat degree%pouring rate
对30 t～50 t下注大钢锭检测不合格的原因进行了深入的研究与分析，发现主要缺陷为夹渣及白点。采取优化钢锭模设计参数，即增加冒口容积，提高钢锭锥度，降低钢锭高径比，另外还适当增加钢水浇注过热度、降低浇注速度等，充分去除钢锭模内上浮的钢水夹杂物。同时通过加强保护浇注，冶炼过程的钢水去气、去夹杂，脱模后钢锭的缓冷等操作，最终使得30 t～50 t下注大钢锭检测不合格问题得到了有效控制。
對30 t～50 t下註大鋼錠檢測不閤格的原因進行瞭深入的研究與分析，髮現主要缺陷為夾渣及白點。採取優化鋼錠模設計參數，即增加冒口容積，提高鋼錠錐度，降低鋼錠高徑比，另外還適噹增加鋼水澆註過熱度、降低澆註速度等，充分去除鋼錠模內上浮的鋼水夾雜物。同時通過加彊保護澆註，冶煉過程的鋼水去氣、去夾雜，脫模後鋼錠的緩冷等操作，最終使得30 t～50 t下註大鋼錠檢測不閤格問題得到瞭有效控製。
대30 t～50 t하주대강정검측불합격적원인진행료심입적연구여분석，발현주요결함위협사급백점。채취우화강정모설계삼수，즉증가모구용적，제고강정추도，강저강정고경비，령외환괄당증가강수요주과열도、강저요주속도등，충분거제강정모내상부적강수협잡물。동시통과가강보호요주，야련과정적강수거기、거협잡，탈모후강정적완랭등조작，최종사득30 t～50 t하주대강정검측불합격문제득도료유효공제。
The unqualified reason of 30 t~50 t bottom poured heavy ingot has been thoroughly studied and ana-lyzed.It showed that the major defects are slag inclusion and flakes .By adopting the optimized design parameters for ingot mold , such as increasing the volume of riser , increasing the taper of ingot , reducing the height-diameter ratio of ingot, appropriately increasing the superheat degree of molten steel and reducing the pouring rate etc ., the floating inclusions of molten steel in the ingot mold could be removed adequately .Meanwhile, by strengthening the protection for pouring process , degassing and removing the inclusion for molten steel during smelting process , slow cooling after remolding, the unqualified issue of 30 t~50 t bottom poured heavy ingot has been effectively controlled eventually .
