D0:10.13374f.issn1001-053x.2011.s1.035 第33卷增刊1 北京科技大学学报 Vol.33 Suppl.1 2011年12月 Journal of University of Science and Technology Beijing Dec.2011 齿轮钢氧含量及夹杂物控制技术研究 陈天明)杨素波)王新华》 1)攀钢集团研究院有限公司，成都6117312)攀钢集团攀枝花钢钒有限公司，攀枝花617022 3)北京科技大学治金与生态工程学院，北京100083 通信作者，E-mail:chentml16@163.com 摘要利用热力学软件计算了齿轮钢氧含量与夹杂物成分控制、夹杂物转变条件.结果表明，20CMH钢中具有较高塑性 的非金属夹杂物成分（质量分数）为：Si020%-10%、A20322%-55%、Ca042%-60%、Mg05%-10%,与之平衡的钢液中 铝的质量分数大于0.020%，钙的质量分数大于0.7×10-6，a[o为0.0005%左右：选择组成为Ca0>40%、A山，03≤37%、Mg0 10%、(%C0+%Mg0)/%Si02为10、Si02含量尽量低的渣系，钢中Al203、Mg0·Al203夹杂物可转变为低熔点的钙铝酸盐. 试验发现LF和RH精炼结束时钢液T[O]含量均随炉渣碱度增加而降低，采用高A山，O3含量的炉渣对降低T[O]含量有利：精 炼过程钢液中夹杂物按“A山03系夹杂物→MgO一A山，0，系夹杂物→Ca0-Mg0一A,0,系夹杂物”顺序发生转变，其中Mg0- AL,O,系夹杂物向C0-Mg0一Al,0,系夹杂物的转变是由外向内逐步进行的，转变速度相对较慢：降低T[0]含量有利于生成 较低熔点的Ca0-Mg0一Al,0,系夹杂物. 关键词齿轮钢：精炼：炉渣：非金属夹杂物 分类号TF701.2:TF762.1 Control technology for oxygen content and inclusions of gear steel CHEN Tian-ming☒✉，YANG Su-bo2,WANG Xin-haua 1)Research Institute Co.Ltd..PanGang Group.Chengdu 611731,China 2)PanGang Group Steel Vanadium Co.Ld.,Panzhihua 617022.China 3)School of Metallurgical and Ecological Engineering.University of Science and Technology Beijing.Beijing 100083.China Corresponding author.E-mail:chentml16@163.com ABSTRACT The control of oxygen content and composition and the transformation conditions of non-metallic inclusions in gear steel are calculated with the thermodynamic calculation software Factsage.The results show that the composition of non-metallic inclusions with high plasticity in 20CrMoH steel is as follows mass fraction):Si0,0%to 10%,Al,0,22%to 55%,Cao 42%to 60%,and Mgo 5%to 10%.Under this condition,the mass fraction of aluminum in molten steel is above 0.020%,that of calcium is above 0.7x10,and the activity of oxygen in molten steel is about 0.0005%.If the compositions of refining slag with Ca40%. AlO,37%,Mgo 10%.(%Ca0 +Mgo)/%Si02 =10,and the Si0,content as low as possible are selected,AlO,and Mgo.Al O in molten steel can transform into calcium aluminates with low melting point.It is found that the contents of T[O]at the end of LF and RH refining both decrease with the increase in slag basicity,and the content of T[O]decreases with increasing the con- tent of Al2O3 in the slag.In the refining process,the composition of the non-metallic inclusions changes in order of "inclusions of the Al2O,system-inclusions of the Mgo-Al2O,system-inclusions of the Ca0-MgO-Al2O,system",among which the change of inclusions of the Mgo-Al,O,system to inclusions of the Cao-MgO-Al,O,system is inwardly from the outside surface and the reaction speed is rel- atively slower.Thus,at the end of the ladle furnace refining LF),there are still many unchanged MgO-Al,O,system inclusions.The T[O]content of the steel significantly affects the composition change of the inclusions and decreasing T[]content favors the change of inclusions KEY WORDS gear steel:refining:slag:non-metallic inclusion 收稿日期：2011-08一11第 33 卷 增刊 1 2011 年 12 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 33 Suppl． 1 Dec． 2011 齿轮钢氧含量及夹杂物控制技术研究 陈天明1) 杨素波2) 王新华3) 1) 攀钢集团研究院有限公司，成都 611731 2) 攀钢集团攀枝花钢钒有限公司，攀枝花 617022 3) 北京科技大学冶金与生态工程学院，北京 100083 通信作者，E-mail: chentm116@ 163． com 摘 要 利用热力学软件计算了齿轮钢氧含量与夹杂物成分控制、夹杂物转变条件． 结果表明，20CrMoH 钢中具有较高塑性 的非金属夹杂物成分( 质量分数) 为: SiO2 0% ～ 10% 、Al2O3 22% ～ 55% 、CaO 42% ～ 60% 、MgO 5% ～ 10% ，与之平衡的钢液中 铝的质量分数大于 0. 020% ，钙的质量分数大于 0. 7 × 10 － 6 ，a［O］为 0. 000 5% 左右; 选择组成为 CaO ＞ 40% 、Al2O3≤37% 、MgO 10% 、( % CaO + % MgO) /% SiO2 为 10、SiO2 含量尽量低的渣系，钢中 Al2O3、MgO·Al2O3 夹杂物可转变为低熔点的钙铝酸盐． 试验发现 LF 和 RH 精炼结束时钢液 T［O］含量均随炉渣碱度增加而降低，采用高 Al2O3 含量的炉渣对降低 T［O］含量有利; 精 炼过程钢液中夹杂物按“Al2O3 系夹杂物→MgO--Al2O3 系夹杂物→CaO--MgO--Al2O3 系夹杂物”顺序发生转变，其中 MgO-- Al2O3 系夹杂物向 CaO--MgO--Al2O3 系夹杂物的转变是由外向内逐步进行的，转变速度相对较慢; 降低 T［O］含量有利于生成 较低熔点的 CaO--MgO--Al2O3 系夹杂物． 关键词 齿轮钢; 精炼; 炉渣; 非金属夹杂物 分类号 TF701. 2; TF762 + . 1 Control technology for oxygen content and inclusions of gear steel CHEN Tian-ming1) ，YANG Su-bo 2) ，WANG Xin-hua3) 1) Research Institute Co． Ltd． ，PanGang Group，Chengdu 611731，China 2) PanGang Group Steel ＆ Vanadium Co． Ltd． ，Panzhihua 617022，China 3) School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China Corresponding author，E-mail: chentm116@ 163． com ABSTRACT The control of oxygen content and composition and the transformation conditions of non-metallic inclusions in gear steel are calculated with the thermodynamic calculation software Factsage． The results show that the composition of non-metallic inclusions with high plasticity in 20CrMoH steel is as follows ( mass fraction) : SiO2 0% to 10% ，Al2O3 22% to 55% ，CaO 42% to 60% ，and MgO 5% to 10% ． Under this condition，the mass fraction of aluminum in molten steel is above 0. 020% ，that of calcium is above 0. 7 × 10 － 6 ，and the activity of oxygen in molten steel is about 0. 000 5% ． If the compositions of refining slag with CaO ＞ 40% ， Al2O3≤37% ，MgO 10% ，( % CaO + % MgO) /% SiO2 = 10，and the SiO2 content as low as possible are selected，Al2O3 and MgO·Al2O3 in molten steel can transform into calcium aluminates with low melting point． It is found that the contents of T［O］at the end of LF and RH refining both decrease with the increase in slag basicity，and the content of T［O］decreases with increasing the con￾tent of Al2O3 in the slag． In the refining process，the composition of the non-metallic inclusions changes in order of“inclusions of the Al2O3 system→inclusions of the MgO-Al2O3 system→inclusions of the CaO-MgO-Al2O3 system”，among which the change of inclusions of the MgO-Al2O3 system to inclusions of the CaO-MgO-Al2O3 system is inwardly from the outside surface and the reaction speed is rel￾atively slower． Thus，at the end of the ladle furnace refining ( LF) ，there are still many unchanged MgO-Al2O3 system inclusions． The T［O］content of the steel significantly affects the composition change of the inclusions and decreasing T［O］content favors the change of inclusions． KEY WORDS gear steel; refining; slag; non-metallic inclusion 收稿日期: 2011--08--11 DOI:10.13374/j.issn1001-053x.2011.s1.035