建筑维护系统用高耐蚀性铁素体不锈钢的研发与应用  

Development of high corrosion-resistant ferritic stainless steel and its application in the building cladding system

作　　者：何汝迎[1] 江来珠[2] 董文卜[2] 

机构地区：[1]宝山钢铁股份有限公司不锈钢事业部,浙江宁波315807 [2]宝山钢铁股份有限公司研究院,上海201900

出　　处：《宝钢技术》2012年第2期1-5,共5页Baosteel Technology

摘　　要：研究了Mo、Nb、Ti对22.5%Cr铁素体不锈钢力学性能、耐腐蚀性能的影响,研究结果表明,Mo主要以固溶状态存在于铁素体不锈钢中,通过固溶强化提高了铁素体不锈钢的强度;在Ti/Nb双稳定铁素体不锈钢中,由于粗大TiN颗粒的形成和金属间化合物在晶界的析出,钢的韧性明显降低;在Nb单稳定铁素体不锈钢中,Nb以固溶状态和Nb(C,N)析出相存在于铁素体基体中,Nb(C,N)弥散分布于铁素体晶内,并作为σ相的形核质点,避免了σ相在晶界的析出,从而改善了钢的低温韧性。在此基础上研制出建筑维护系统用的高耐蚀性铁素体不锈钢B445R。测试结果表明,B445R在氯离子溶液中具有比316L更优越的耐点腐蚀性能,而且具有良好的成形性能和焊接性能,这些优点使其成为沿海地区建筑维护系统理想的装饰材料。Effects of Mo,Nb,Ti on mechanical properties and corrosion resistance of 22.5%Cr ferritic stainless steel were investigated.The results show that Mo exists in ferritic stainless steel mainly in a solution state,and it can enhance steel＇s strength through solid-solution strengthening.In Ti/Nb dual-stabilized ferritic stainless steel,the steel＇s toughness decreases obviously because coarse TiN particles form and some metallic compounds precipitate at the grain-boundaries.In Nb single-stabilized ferritic stainless steel,Nb exists either in solid solution or in the forms of dispersed precipitates Nb（C,N）,which will act as the nuclei for the precipitation of fine sigma phase.As a result,the precipitation of coarse sigma phase along the grain-boundary can be inhibited,leading to a significant improvement in steel＇s toughness at a low temperature.Based on these,a high corrosion-resistant ferritic stainless steel B445R was developed for the building cladding system.It is shown that B445R has a superior corrosion resistance to austenitic 316L in the chloride solution.Besides,it has a good forming property and weldability.All these make it an ideal decorating material for the building cladding system in coast regions.

关 键 词：铁素体不锈钢 点状腐蚀 屋顶 幕墙 

分 类 号：TF764.1[冶金工程—钢铁冶金]