本发明提供一种含稀土元素的免涂装耐候钢及其制备方法，属于耐候钢技术领域，采用的技术方案是通过优化化学成分Cr、Ni、Cu、Mo、Re、Ca之间含量及配比，控制1.0≥X≥0.3，其中，X是(20 Re +50Ca)与(1.5Cr+Ni+Cu+1.2Mo)之间的比值。有益效果是：本发明提供的耐候钢在焊接时，各类焊缝的夹杂物数量明显减少、尺寸明显减小，焊缝裂纹倾向明显降低，焊接冶金质量大大提高，探伤合格率提高；除添加适量的Si、Ni、Cr、Cu，使耐大气腐蚀指数I≥6.5以外、还通过添加适量的Y和Mo，提高了耐候性能，既更耐大气腐蚀，又保持优异的力学性能。
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[ DB ] CONNECT:[ UseTime:0.001168s ] mysql:host=pc-m5epcw1px949b110u.rwlb.rds.aliyuncs.com;port=3306;dbname=yousedb;charset=utf8
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[ SQL ] SELECT * FROM `tb_para` WHERE `id` = 1 LIMIT 1 [ RunTime:0.001375s ]
[ SQL ] SHOW COLUMNS FROM `tb_tech` [ RunTime:0.001145s ]
[ SQL ] UPDATE `tb_tech` SET `hit`=`hit`+1 WHERE `id` = 166000 [ RunTime:0.001028s ]
[ SQL ] SELECT * FROM `tb_tech` WHERE `id` = 166000 LIMIT 1 [ RunTime:0.001031s ]
[ SQL ] SHOW COLUMNS FROM `tb_admin` [ RunTime:0.004455s ]
[ SQL ] SELECT `realname` FROM `tb_admin` WHERE `id` = 1 LIMIT 1 [ RunTime:0.004135s ]
[ SQL ] SHOW COLUMNS FROM `tb_category` [ RunTime:0.004444s ]
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[ SQL ] SELECT * FROM `tb_anchor` ORDER BY `id` ASC [ RunTime:0.002650s ]
[ SQL ] SELECT `id`,`title` FROM `tb_tech` WHERE `id` > 166000 AND `check_status` = 1 AND `category_id` = 135 ORDER BY `submit_date` ASC LIMIT 1 [ RunTime:0.006677s ]
[ SQL ] SELECT `id`,`title` FROM `tb_tech` WHERE `id` < 166000 AND `check_status` = 1 AND `category_id` = 135 ORDER BY `submit_date` DESC LIMIT 1 [ RunTime:0.129732s ]
[ SQL ] SHOW COLUMNS FROM `tb_mcc` [ RunTime:0.001083s ]
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[ SQL ] SHOW COLUMNS FROM `tb_industry_report` [ RunTime:0.001209s ]
[ SQL ] SELECT `id`,`cate_aid`,`cate_bid`,`title`,`pic`,`tag`,`price`,`hit`,`mode` FROM `tb_industry_report` [ RunTime:0.001364s ]
[ SQL ] SELECT * FROM `tb_category` WHERE `pid` = 36 ORDER BY `sortid` ASC [ RunTime:0.009958s ]
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[ SQL ] SELECT * FROM `tb_advert` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000772s ]
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