CSP工艺51CrV4钢精炼过程钢中夹杂物研究

炼钢 ›› 2017, Vol. 33 ›› Issue (4): 73-78.

• 产品工艺与质量控制 • 上一篇

CSP工艺51CrV4钢精炼过程钢中夹杂物研究

（武汉钢铁有限公司1.研究院，湖北武汉430080；2.条材厂，湖北武汉430083）

接受日期:1900-01-01 出版日期:2017-08-05

Study on cleanliness and inclusions for 51CrV4 steel during refining by CSP process

Accepted:1900-01-01 Online:2017-08-05

摘要/Abstract

摘要： 针对CSP工艺中高碳钢生产中存在的水口结瘤及表面质量问题，通过工业试验对“BOF→LF→薄板坯连铸”工艺流程51CrV4弹簧钢冶炼过程钢水洁净度及夹杂物形貌、尺寸、组成变化进行了研究分析。试验结果表明，通过造高碱度精炼渣和吹氩工艺，中包钢水w(T.O)可控制在20×10-6左右，w(N)可控制在45×10-6左右；钢中夹杂数量16.62个/mm2，不大于10 μm夹杂比例超过97 %；钙处理后，钢中夹杂由固态Al2O3-MgO、SiO2-CaO-Al2O3夹杂转变为液态CaO-SiO2/MgO-Al2O3、CaO-MgO/SiO2-Al2O3-CaS复合夹杂。从理论上分析了钙处理对夹杂物变性的条件，钢中w(Als)=0.025%时，控制w(Ca)=0.001 %，w(S)≤0.001 %即可使Al2O3转变为液态夹杂。

关键词: 精炼, 洁净度, 夹杂物, 钙处理

Abstract: Aiming at the problems of nozzle clogging and surface quality of high carbon steel produced by CSP process, the change of the cleanliness of molten steel and the morphology, the size and the compositions of inclusions in 51CrV4 steel during refining were studied by industrial experiments in “BOF-LF-thin slab casting” process. The results showed that mass fraction of T.O and [N] of molten steel in tundish were about 20×10-6 and 45×10-6 respectively with high basicity refining slag and process of soft argon blowing. The density of inclusion was 16.62/mm2，and the proportion with less than 10 μm was more than 97 %. The solid inclusions of Al2O3-MgO、SiO2-CaO-Al2O3 were modified into liquid compound inclusions of CaO-SiO2/MgO-Al2O3、CaO-MgO/SiO2-Al2O3-CaS by Ca treatment. The inclusion modification conditions with Ca treatment were analyzed by theory. When the mass fraction of [Al] was about 0.025 %, the mass fraction of [Ca] and [S] should be 0.001 % and less than 0.001 % respectively. And the inclusion of Al2O3 can be modified into liquid calcium aluminates.

Key words: refining, cleanliness of molten steel, inclusions, Ca treatment

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CSP工艺51CrV4钢精炼过程钢中夹杂物研究

Study on cleanliness and inclusions for 51CrV4 steel during refining by CSP process

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