稀土元素对430铁素体不锈钢组织和性能的影响  

Effect of rare earth elements on microstructure and properties of 430ferritic stainless steel

作　　者：谢胜涛 邵书东 亓海燕[1] 王俊海[1] XIE Sheng-tao;SHAO Shu-dong;QI Hai-yan;WANG Jun-hai(Research and Development Center,Shandong Taishan Steel Group Company,Jinan 271100,Shandong,China)

机构地区：[1]山东泰山钢铁集团有限公司技术研发中心,山东济南271100

出　　处：《中国冶金》2022年第6期94-100,共7页China Metallurgy

摘　　要：对常规430铁素体不锈钢进行了稀土微合金化改进,最终开发出高品质430RE铁素体不锈钢冷轧退火带钢,并研究了稀土微合金化对430不锈钢的力学性能、深冲性能、抗皱性能、显微组织和织构的影响。通过稀土微合金化,430不锈钢中尺寸较粗大的CaO·SiO_(2)和Al_(2)O_(3)·CaO夹杂物,大多转变为430RE不锈钢中尺寸较细小、分布密度较高的富含稀土元素的夹杂物。与采用基本相同热轧、冷轧和退火工艺的430不锈钢相比,430RE热轧板和冷轧退火板的强度水平均有所降低、塑性水平均明显升高;430RE生产过程中的宏观织构演变表现出更强的高塑性应变比(r值)γ-织构组分形成趋势,这使得430RE冷轧退火板的深冲性更优;430RE冷轧退火组织中沿轧向偏聚、低r值取向晶粒簇减少,这使得430RE冷轧退火板的抗皱性更优。The conventional 430ferritic stainless steel(FSS)was microalloyed with rare earth(RE)elements,and cold rolled and annealed(CA)sheets of 430RE FSS with higher qualities were finally developed.The effect of RE microalloying on the mechanical property,deep drawing ability,ridging resistance,microstructure and texture of 430FSS were studied.By RE microalloying,most CaO·SiO_(2)and Al_(2)O_(3)·CaO inclusions with relatively large size in 430FSS are transformed into inclusions rich in RE elements with relatively small size and high distribution density in 430RE FSS.Compared with 430FSS under similar hot rolling,cold rolling and annealing processes,the hot rolled(HR)band and CA sheets of 430RE both obtain lower strength and higher ductility,the texture evolution of 430RE during production displays stronger formation tendency ofγ-fiber with high r-value,which conduces to higher deep drawing ability of 430RE CA sheet,and grain colonies with lowr-value orientations assembling along rolling direction in 430RE CA sheet are reduced,which conduces to higher ridging resistance of 430RE CA sheet.

关 键 词：铁素体不锈钢 稀土微合金化 力学性能 深冲性能 抗皱性能 显微组织 织构 

分 类 号：TG142.71[一般工业技术—材料科学与工程]