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针对硅锰钢履带板冲击韧性波动范围大、冲击韧性低这一生产中急待解决的问题 ,主要研究了硫化物夹杂对冲击性能的影响 ,发现硫化物的形态是影响冲击性能的主要因素 .当钢中硫化物形态以球形、多角形的Ⅰ、Ⅲ型为主时 ,钢的冲击性能良好 ;当钢中硫化物形态以长条链形、网状的Ⅱ型析出时 ,将会对钢的冲击韧性产生不利的影响 .硫化物的形态主要受钢中稀土残余含量的影响 ,当稀土残余含量w(Re) >0 0 4 %、残余稀土与S含量的比值w (Re) /w(S) >1 2 5时 ,方能保证钢中的硫化物形态为Ⅰ、Ⅲ型 .加入变质剂前的钢液原始O含量低 ,可得到高回收率的稀土残余含量 ,钢中的硫化物形态可以控制为Ⅰ、Ⅲ型 ;加入变质剂后的钢液原始O含量高 ,稀土回收率低 ,只能得到以Ⅱ型为主的硫化物
In order to solve the problems that need to be solved in the production of Si-Mn steel track shoes with high impact toughness and low impact toughness, the impact of sulfide inclusions on the impact properties is studied. The results show that the morphology of sulfides is the main factor affecting the impact properties. The impact properties of steel are good when the shape of sulfide in steel is spherical and polygonal type Ⅰ and Ⅲ. When the shape of sulfide in steel is long chain and mesh type Ⅱ, (Re)> 0 0 4%, and the ratio of residual rare earth to S w (Re) / w (Re) / w (Re) S)> 1 2 5, the shape of sulfide in steel can be ensured to be Type I and Type 3. The original O content of molten steel before adding modifier is low, and the residual rare earth content with high recovery rate can be obtained. The sulfide content in steel The morphology can be controlled as Type I and Type III. After the modification agent is added, the original O content of the molten steel is high and the recovery rate of rare earth is low, only type II-based sulfides