国内外耐磨钢夹杂物控制水平分析

Comparison of Cleanliness Wear-resistant Steel at Home and Abroad

耐磨钢中夹杂物是影响耐磨钢强度、韧性的重要因素,为了分析国内外耐磨钢中夹杂物的控制水平,对日本和国内两厂的耐磨钢进行夹杂物大小、分布、成分,以及钢基体的硬度进行分析。结果表明,国内A厂通过Ca处理后与日本耐磨钢的夹杂物尺寸接近,但数量密度较大,洁净度略低于日本耐磨钢。对钢中夹杂物成分进行检测:日本耐磨钢中的夹杂物类型主要为CaO、CaO-Al_(2)O_(3)、MgO-Al_(2)O_(3)、MgO-Al_(2)O_(3)-CaO和TiN、Ti(C,N)夹杂;国内A厂通过Ca处理技术,降低了钢中MnS析出量,夹杂物中CaS、CaO含量增加;未经过Ca处理的国内B厂耐磨钢中发现Mn S析出,经过轧制后呈长条状。对各厂的硬度进行分析,日本耐磨钢基体平均硬度为447 HV,且钢基体组织硬度分布均匀,国内A厂和B厂略低于日本耐磨钢,硬度均匀性波动较大,组织控制水平与日本产品尚有差距。

Inclusions in wear-resistant steel are important factors that affect the strength,toughness and other properties of wear-resistant steel.To analyse the control level of inclusions in wear-resistant steel at home and abroad,the size,distribution and composition of inclusions and the steel matrix hardness of wear-resistant steel from Japan and China were analysed.The results show that the size of inclusions in factory A is similar to that of the Japanese wear-resistant steel,but the density of inclusions is higher,which leads to the cleanliness being slightly lower than that of japanese wear-resistant steel.The inclusions in Japanese steel are mainly CaO,CaO-Al_(2)O_(3),MgO-Al_(2)O_(3),MgO-Al_(2)O_(3)-CaO and TiN,Ti(C,N).The precipitation of MnS in steel decreases and the contents of CaS and CaO in inclusions increase by Ca-treatment in the factory A.However,MnS is found to precipitate in the wear-resistant steel of factory B domestically.According to the hardness analysis of each factory,the average hardness of the Japanese wear-resisting steel matrix is 447 HV,and the hardness distribution is uniform.The hardness of domestic fectories A and B is slightly lower than that of Japanese wear-resistant steel,and both have uneven hardness distributions.There is still a gap between the domestic products and Japanese products in terms of microstructure control level.