铁素体不锈钢罩式退火表面铬氧化物富积机理  

Cr_2O_3 enrichment on surface of ferritic stainless steel during batch annealing

作　　者：王建泽[1] 钱张信[1] 惠恺 纪显彬[1] 

机构地区：[1]酒泉钢铁(集团)有限责任公司,甘肃嘉峪关735100

出　　处：《金属热处理》2017年第9期202-205,共4页Heat Treatment of Metals

摘　　要：利用扫描电镜和能谱对430钢罩式退火卷前后氧化层结构以及410L罩式退火卷表面绿色富积物进行了分析。研究结果表明,430钢热轧黑卷经罩式炉退火后,氧化层厚度由15μm降为6μm,外层铁氧化物被还原,基体Cr、Si等与O结合能力强的元素被氧化而富集。410L钢罩式退火卷表面绿色富积物为颗粒状的铬氧化物,通过对410L钢吹H_2工艺研究发现,目前吹H_2工艺未考虑加热延时对炉内气氛的影响,由于加热延时,H_2吹扫结束时炉内还原反应未完全结束,造成了炉内水蒸气含量增加,使得带钢基体中的Cr被氧化。通过延长H_2吹扫时间可使炉内P(H_2)/P(H_2O)处于一个恰当的值,从而保证基体中Cr不被H_2O(g)所氧化。The changes of oxide layer of 430 steel before and after batch annealing and the green enrichment on surface of 410L steel were analyzed by using scanning electron microscopy and energy spectrum. The results show that the oxide layer thickness of 430 steel decreases from 15 μm to 6 μm after batch annealing and the green enrichment on surface of 410L steel is Cr oxides. Due to the heating delay which leads to the water vapor content increased, the Cr of the steel is oxidized. By prolonging the H2 purging time, the P（ H2 ）/P（ H2O） can be placed in an appropriate value in the furnace, so that the Cr oxidized by H2O （g） can be avoid.

关 键 词：铁素体不锈钢 铬氧化物 退火 

分 类 号：TG142.23[一般工业技术—材料科学与工程]