{"meta":{"id":"https:\/\/api.iclient.ifeng.com\/ipadtestdoc?aid=ucms_7yn8yPfHYUl","type":"doc","o":"1","documentId":"ucms_7yn8yPfHYUl"},"body":{"newStatus":"1","documentId":"ucms_7yn8yPfHYUl","staticId":"ucms_7yn8yPfHYUl","title":"在这些介质中合理选择不锈钢材质","shareTitle":"在这些介质中合理选择不锈钢材质","thumbnail":"http:\/\/d.ifengimg.com\/w150_h106_q100\/img1.ugc.ifeng.com\/newugc\/20200810\/8\/wemedia\/2d5aaa73deac32a2c03d7465c724f9ba72b17cc2_size93_w863_h576.jpeg","source":"中科普金","author":"","editorcode":"weMedia","editTime":"2020-08-10 08:51:10","updateTime":"2020\/08\/10 08:51:10","wapurl":"http:\/\/\/\/feng.ifeng.com\/c\/7yn8yPfHYUl","introduction":"","wwwurl":"http:\/\/\/\/feng.ifeng.com\/c\/7yn8yPfHYUl","commentsUrl":"ucms_7yn8yPfHYUl","commentCount":0,"text":"
<\/p>
大气环境介质<\/p>
一般选用Cr13、Cr17、或18-8型等不锈钢材质。<\/p>
水介质<\/p>
18-8型、316型等不锈钢材质可耐氯离子腐蚀,做刀具也可选用Cr13型不锈钢。<\/p>
在海水中应选用高铬镍的含钼不锈钢,或者双相钢。<\/p>
硝酸介质<\/p>
在稀硝酸(≤65%)中,选择18-8型不锈钢就可以了,因为其具有良好的耐硝酸腐蚀性能。<\/p>
随着浓度的增加,达到68.4%以上时,可选用0Cr25Ni20耐热不锈钢。<\/p>
浓度再上升到≥85%时,就使用含硅的高铬奥氏体不锈钢。<\/p>
含钼不锈钢一般不用于耐硝酸腐蚀。<\/p>
硫酸介质<\/p>
不含钼的不锈钢是不能用于耐硫酸腐蚀,而含钼2--3%的316系列不锈钢是耐硫酸腐蚀的最低牌号,含钼双相钢也相当或优于316系列不锈钢。<\/p>
随着硫酸浓度的提高,需要选用高铬高镍、含铜含硅的奥氏体不锈钢。<\/p>
盐酸介质<\/p>
盐酸介质还原性强,不锈钢很难钝化,稀盐酸中需要选用高铬高镍、含铜含硅的奥氏体不锈钢,18-8型不锈钢不能采用。<\/p>
烧碱介质<\/p>
选用含铬(≥26%)的纯铁素体不锈钢或含镍(≥20%)的铬镍奥氏体不锈钢。<\/p>
有机酸介质<\/p>
一般可选Cr17型不锈钢,或含钼的奥氏体不锈钢。<\/p>
防止局部腐蚀<\/p>
晶间腐蚀:可选择321不锈钢、304L不锈钢、316Ti不锈钢、347不锈钢等材质。<\/p>
点腐蚀:可选择含钼的奥氏体不锈钢316(L)、高纯铁素体不锈钢00Cr18Mo2、双相不锈钢18-5型、2205等。<\/p>
缝隙腐蚀:一般耐点腐蚀的不锈钢种都可以选用。<\/p>
应力腐蚀:316系列不锈钢,双相不锈钢都可以选用。<\/p>","img":[{"url":"http:\/\/d.ifengimg.com\/mw640_q100\/img1.ugc.ifeng.com\/newugc\/20200810\/8\/wemedia\/e3f39084b76c55613b606bb51c93fb146ecc290e_size115_w1080_h720.jpg","size":{"width":"640","height":"426"}}],"summary":"大气环境介质一般选用Cr13、Cr17、或18-8型等不锈钢材质。水介质18-8型、316型等不锈钢材质可耐氯离子腐蚀,做刀具也可选用Cr13型不锈钢。在海水中","sharesummary":"大气环境介质一般选用Cr13、Cr17、或18-8型等不锈钢材质。水介质18-8型、316型等不锈钢材质可耐氯离子腐蚀,做刀具也可选用Cr13型不锈钢。在海水中","commentType":"0","wemediaEAccountId":"1586789","showclient":"0","shareurl":"https:\/\/ishare.ifeng.com\/c\/s\/v002QEm11u9jdaiatsNyyOgp6xyq9y--Jc22pXdvEqKObRKQ__","praise":"0","like_num":"0"}}