夹杂物特性对10CrNi3MoV钢冲击韧性的影响

Effect of Inclusion Characteristics on Impact Toughness of 10CrNi3Mo Steel

基于200 t BOF-LF-RH-板坯连铸的10CrNi3Mo钢冶金生产流程,分别通过向钢液喂入硅钙包芯线和钙镁复合包芯线,对夹杂物进行变性处理,之后通过4300厚板轧机轧制35 mm板并进行热处理。利用等电位溶液电解、扫描电镜与能谱、夹杂物分析仪等设备和方法对试验钢的夹杂物进行定量、定性分析,获得夹杂物的特性参数,主要表现为变性后夹杂物单位面积数量减少约40%,平均间距增加近1倍。结合夏比冲击试验结果,得出夹杂物变形处理对冲击韧性特别是低温冲击韧性有明显改善的结论。

Based on 200 t BOF-LF-RH-CC slab metallurgical process to produce 10CrNi3Mo steel,silicon-calcium cored wire and calcium-magnesium composite cored wire are injected respectively into liquid steel to modify inclusions,and the slabs are rolled to 35 mm plates with 4300 mm heavy plate rolling mill then to carried out heat treatment.The inclusions of test steel are analyzed quantitatively and qualitatively by means of SPEED,SEM&EDS and INCA etc.The obtained main performance is that the number of inclusions per unit area is reduced by about 40%and the average distance is nearly doubled after modification.Combined with the Charpy impact test results,it is concluded that the inclusion deformation treatment is obviously improve to the impact toughness,especially the low-temperature impact toughness.